CN109184843A - hydraulic tappet and valve timing system - Google Patents
hydraulic tappet and valve timing system Download PDFInfo
- Publication number
- CN109184843A CN109184843A CN201810865397.9A CN201810865397A CN109184843A CN 109184843 A CN109184843 A CN 109184843A CN 201810865397 A CN201810865397 A CN 201810865397A CN 109184843 A CN109184843 A CN 109184843A
- Authority
- CN
- China
- Prior art keywords
- way clutch
- hydraulic tappet
- shell
- plunger
- hydraulic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
- F01L1/16—Silencing impact; Reducing wear
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
- F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
- F01L1/245—Hydraulic tappets
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2810/00—Arrangements solving specific problems in relation with valve gears
- F01L2810/04—Reducing noise
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Provide hydraulic tappet and the valve timing system including the hydraulic tappet.A kind of hydraulic tappet, it includes shell, plunger and the one-way clutch being arranged between plunger and shell, one-way clutch is configured to switch between lock state and releasing lock state, in the locked state, one-way clutch permission plunger stretches out further out from shell and suppressed column plug is further extended inwardly into shell；In the state of unlocking, one-way clutch permission plunger further extends inwardly into shell and neutralizes to be stretched out further out from shell.In hydraulic tappet according to the present invention and valve timing system including the hydraulic tappet; when engine after long-time is shut down when starting; one-way clutch is maintained at lock state, and hydraulic tappet will not be compressed suddenly by rocker arm, can prevent or mitigate valve mechanism and generate noise.And when engine work, one-way clutch is actuated to the state of unlocking, and the normal function of hydraulic tappet is unaffected.
Description
Technical field
The present invention relates to the air distribution systems of vehicle, and in particular to hydraulic tappet and the valve timing system including the hydraulic tappet
System.
Background technique
Fig. 1 schematically shows a kind of members of the valve timing system of existing design.In the normal work of engine
When making, always filled with hydraulic oil in the high pressure chest 11 of hydraulic tappet 10 and locker room 12.In engine for a long time (for example, being greater than
24 hours) shut down after, in engine start, noise can be generated.This is because the hydraulic tappet after engine is shut down for a long time
Without high pressure oil in 10 high pressure chest 11, when engine starts in this case, the meeting abnormal start-up of valve 20 causes valve to be opened
And noise of taking a seat (for example, impact noise can be generated between valve 20 and valve seating 30).
Summary of the invention
In view of the above-mentioned prior art state and make the present invention.The purpose of the present invention is to provide a kind of hydraulic tappet and
Valve timing system including the hydraulic tappet, the hydraulic tappet can prevent or mitigate after engine is shut down for a long time when starting
Valve mechanism generates noise.
A kind of hydraulic tappet is provided comprising:
Shell；
Partially protrude into the plunger in the shell, the shell axial lower part and the plunger axial lower part it
Between limit high pressure chest, be separately provided for filling the of hydraulic oil to the high pressure chest in the shell and the plunger
One duct and the second duct；And
One-way clutch between the plunger and the shell is set, and the one-way clutch is adapted to
It is enough to switch between lock state and releasing lock state, under the lock state, described in the one-way clutch permission
Plunger stretches out further out from the shell and the plunger is inhibited further to extend inwardly into the shell；In the solution
Except lock state, the one-way clutch allows the plunger further to extend inwardly into the shell neutralization from the shell
It stretches out further out.
In at least one embodiment, when the one-way clutch is not activated, the one-way clutch is protected
It holds in the lock state.
In at least one embodiment, the outer peripheral surface and the shell of the plunger is arranged in the one-way clutch
Inner peripheral surface between.
In at least one embodiment, the hydraulic tappet include be arranged at the inner peripheral surface of the shell it is unidirectional from
It attaches together and sets mounting portion.
In at least one embodiment, the one-way clutch includes being arranged in the one-way clutch mounting portion
In locking piece and locking actuator, the locking piece is maintained at latched position or posture by the locking actuator.
In at least one embodiment, it is provided in the hydraulic tappet and leads to the one-way clutch mounting portion
Third duct, from the third duct, hydraulic oil acts on the locking piece and the locking piece is driven to leave the locking bit
It sets or posture, so that the one-way clutch is switched to the state that unlocks from the lock state.
In at least one embodiment, in the axial direction of the hydraulic tappet, the locking actuator is arranged described
The upside of locking piece, the locking piece are ball, and the locking actuator is compressed spring.
In at least one embodiment, at least one axis across the one-way clutch of the hydraulic tappet
Into section, the inner wall of the one-way clutch mounting portion includes: to prolong along the axially extending axial direction of the hydraulic tappet
Stretch section；And the inclination extended segment relative to the axially inclined extension of the axial downside positioned at described axially extending section,
The axially extending section of corresponding part, the radial dimension of the one-way clutch mounting portion are equal or slightly larger than the locking
The radial dimension of part, so that the locking piece be allowed to move up and down, in the corresponding part in the inclination extended segment, it is described unidirectionally from
It attaches together and sets the radial dimension of mounting portion and gradually become smaller towards axial downside, downside is mobile in the axial direction to inhibit the locking piece.
In at least one embodiment, the hydraulic tappet includes around its circumferentially distributed multiple one-way clutch
Device.
The present invention also provides a kind of valve timing systems comprising hydraulic tappet according to the present invention.
In hydraulic tappet according to the present invention and valve timing system including the hydraulic tappet, when engine is when long
Between shut down after when starting, one-way clutch is maintained at lock state, and hydraulic tappet will not be compressed suddenly by rocker arm, can be prevented
Or mitigates valve mechanism and generate noise.And when engine work, one-way clutch is actuated to the state of unlocking,
The normal function of hydraulic tappet is unaffected.
Detailed description of the invention
Fig. 1 schematically shows a kind of members of the valve timing system of existing design.
Fig. 2A schematically shows the axial, cross-sectional view of hydraulic tappet according to embodiment of the present invention.
Fig. 2 B is the partial enlarged view of the part C of Fig. 2A.
Fig. 3 schematically shows hydraulic tappet according to embodiment of the present invention in engine work
State.
Fig. 4 A and Fig. 4 B schematically show hydraulic tappet according to embodiment of the present invention and are mobilizing captain
State after time shuts down when starting.
Description of symbols
10 hydraulic tappets；11 high pressure chests；12 locker rooms；20 valves；30 valve seatings；40 valve spring；
100 hydraulic tappets；110 shells；The axial lower part of 111 shells；112 first ducts；The axial top of 113 shells；
114 one-way clutch mounting portions；115 third ducts；117 axially extending sections；118 inclination extended segments；119 turning points；120 columns
Plug；The axial lower part of 121 plungers；The inner cavity of 122 plungers；The access of 123 plungers；124 second ducts；130 reset springs；140
Check valve；150 high pressure chests；
200 one-way clutch；201 compressed springs；202 locking pieces；
300 camshafts；400 rocker arms；410 cam bawls；
A is axial, and R is radial.
Specific embodiment
Exemplary embodiments of the present invention are described with reference to the accompanying drawings.It should be appreciated that these specific descriptions are only used for
How teaching those skilled in the art implement the present invention, rather than all feasible modes that exhaustion is of the invention, without in
It limits the scope of the invention.
Referring to Fig. 2A and Fig. 2 B, an embodiment of the invention provides a kind of hydraulic tappet 100 comprising shell 110,
Plunger 120, reset spring 130, check valve 140.Shell 110 is substantially tubular with the end, the axial lower part 121 of plunger 120 from
The opening of shell 110 is inserted into shell 110, thus in the axial lower part 121 of plunger 120 and the axial lower part (packet of shell 110
Include bottom) high pressure chest 150 is limited between 111.Plunger 120 is hollow structure, to limit in its inner cavity 122 for storing
The locker room of hydraulic oil.The access 123 being connected to its inner cavity 122 is provided in the axial lower part 121 of plunger 120.Check valve 140
It is set near the access 123, hydraulic oil is allowed to flow into high pressure chest from the inner cavity of plunger 120 122 via the access 123
150, and inner cavity 122 cannot be flowed to from high pressure chest 150 via the access 123.The axial direction of plunger 120 is arranged in reset spring 130
Between lower part 121 and the axial lower part 111 of shell 110.Reset spring 130 is compressed spring, tends to stretch hydraulic tappet 100
It is long.
The first duct 112 being connected to hydraulic oil duct (not shown) is provided in the side wall of shell 110, in plunger 120
Side wall in be provided with the second duct 124, the second duct 124 is communicated to the inner cavity 122 of the first duct 112 and plunger 120.
It should be appreciated that the above structure of hydraulic tappet 100 can use various structures in the prior art, and this field
Technical staff can carry out design and change appropriate to the above structure of hydraulic tappet 100.
In the present embodiment, one-way clutch 200 is provided between shell 110 and plunger 120.This unidirectionally from
Attach together set 200 be not activated in the case where (that is, one-way clutch 200 is in the lock state), the one-way clutch 200 permit
Perhaps plunger 120 is protruding from shell 110 under the action of reset spring 130 (that is, hydraulic tappet 100 is allowed to extend), and
The axial lower part 111 of plunger 120 towards shell 110 is inhibited to be pressed inwardly into (that is, hydraulic tappet 100 is inhibited to shorten).
In the example shown in the series of figures, which can be worked with the working principle similar with unilateral bearing.
More specifically, being provided with 114 He of one-way clutch mounting portion in the side wall on the axial top 113 of shell 110
The third duct 115 being connected to the bottom of the one-way clutch mounting portion 114.One-way clutch 200 includes being arranged in list
Locking piece 202 and compressed spring 201 into arrangement of clutch mounting portion 114, compressed spring 201 is as by locking piece 202
It is maintained at the example of the locking actuator of latched position or posture.Compressed spring 201 is arranged in one-way clutch mounting portion 114
Top and locking piece 202 between, what locking piece 202 was arranged in compressed spring 201 and third duct 115 leads to one-way clutch dress
Between the opening for setting mounting portion 114.
Illustratively, multiple one-way clutch 100 can be set around the axial A (circumferentially) of hydraulic tappet 100.
In a specific but unrestricted example, locking piece 202 is ball, on the radial R of hydraulic tappet 100,
The axis of one-way clutch mounting portion 114 size to the upper side is greater than the size of axial downside.
Referring to Fig. 2 B, in hydraulic tappet 100 at least one axial cross section of one-way clutch 200, shell
The inner wall of the restriction one-way clutch mounting portion 114 on 110 axial top 113 includes: to the upper side axially extending positioned at axis
Section 117；And the inclination extended segment 118 extended relative to axial A inclination positioned at axial downside, in axially extending section of 117 Hes
It tilts and forms turning point 119 between extended segment 118.Axially extending section of 117 corresponding parts, one-way clutch mounting portion
114 radial dimension is equal or slightly larger than the radial dimension of locking piece 202, so that locking piece 202 be allowed to be freely moved up and down.
In the inclination corresponding part in extended segment 118, the radial dimension of one-way clutch mounting portion 114 gradually becomes towards axial downside
Small, to inhibit locking piece 202, downside is mobile in the axial direction.Under the action of compressed spring 201, locking piece 202 is positioned at turnover
At portion 119.At this point, the one-way clutch 200 allows plunger 120, upside is mobile in the axial direction, and inhibit plunger 120 in the axial direction under
Side is mobile.
The state shown in Fig. 2A and Fig. 2 B (lock state) works as plunger when hydraulic oil does not act on locking piece 202
120 under the action of reset spring 130 in the axial direction upside stretch out when, the side of plunger 120 can drive locking piece 202 in the axial direction
It moves (for example, rolling) and compresses compressed spring 201 in upside.When 120 stress of plunger attempts downside movement in the axial direction, plunger
It rubs between 110 and locking piece 202 and between locking piece 202 and shell 120 stuck, locking piece 202 inhibits plunger 120 to axis
It moves downward.
Referring to Fig. 2A to Fig. 3, in engine work, hydraulic oil is from hydraulic oil duct, the first duct 112 and third hole
Road 115 and flow to the locking piece 202 in one-way clutch mounting portion 114, oil pressure effect under, locking piece 202 compression compression
Spring 201 and upside is mobile in the axial direction, one-way clutch 200 unlocks, and plunger 120 can be releasably fastened to shell
110 move up and down along axial A.At this point, hydraulic tappet 100 equally works as the hydraulic tappet of the prior art, kept by oil pressure
Plunger 120.Arrow in Fig. 3 respectively illustrates the flow direction for flowing to the hydraulic oil of one-way clutch 200 and flows to check valve 140
Hydraulic oil flow direction.
When engine is shut down for a long time, the hydraulic oil in hydraulic tappet 100 is likely to leak out, one-way clutch
200 are maintained at lock state, at this point, plunger 120 cannot in the axial direction downside it is mobile (can in the axial direction upside mobile).
Referring to Fig. 4 A and Fig. 4 B, the present invention also provides a kind of valve timing systems, when engine opens after long-time is shut down
When dynamic, plunger 120 will be kept by one-way clutch 200, the position of no wheel camshaft 300 how (i.e. either valve opening
Or valve-closing), the length of hydraulic tappet 100 all keeps being basically unchanged, and establishes until oil pressure and releases one-way clutch 200
Locking (referring to Fig. 3).
Referring to Fig. 3 to Fig. 4 B, valve timing system according to the present invention includes camshaft 300, Rocker arm 4 00 and according to this hair
Bright hydraulic tappet 100.Wherein, camshaft 300 compresses the cam bawl 410 of Rocker arm 4 00, and one end of Rocker arm 4 00 compresses hydraulic
The plunger 120 of tappet 100, the other end of Rocker arm 4 00 compress the valve stem of valve 20.Valve 20 is installed on via valve spring 40
Valve seating 30.Camshaft 300 and Rocker arm 4 00 can use the various prior arts, they not be described in detail herein.
In valve timing system of the invention, when engine starts after long-time shutdown, one-way clutch 200
It is maintained at lock state, hydraulic tappet 100 will not be compressed suddenly, can be prevented or mitigated valve mechanism and be generated noise.More in detail
Carefully, when engine after long-time is shut down when starting, although high pressure chest 150 may be without oil, hydraulic tappet 100 is not
It is fully compressed, can still support Rocker arm 4 00 to prevent noise from generating.
It should be appreciated that above embodiment is merely exemplary, it is not used in the limitation present invention.Those skilled in the art can be with
Various modifications and changes are made to above embodiment under the teachings of the present invention, without departing from the scope of the present invention.
(1) one-way clutch 200 is not limited to be set to the axial top 113 of shell 110, for example, one-way clutch
200 can also be arranged in the middle part of the axial direction of shell 110.
(2) one-way clutch 200 is not limited to be made of compressed spring 201 and locking piece 202.For example, one-way clutch fills
Setting 200 can not include compressed spring 201, and pass through the shape of the profile of one-way clutch mounting portion 114 and locking piece 202
One-way clutch function is realized in cooperation.Thus, locking piece 202 is not limited to ball.The profile of one-way clutch mounting portion 114 is also unlimited
In diagram the case where.
(3) the third duct 115 of the hydraulic oil for activating one-way clutch 200 is not limited to connect with the first duct 112
Logical, which can separate with the first duct 112.
In addition, the medium or means of actuating one-way clutch 200 are also not necessarily limited to hydraulic oil.For example, can be using compression
Gas activates one-way clutch 200, it is made to be moved to the state of unlocking from lock state.
(4) it is appreciated that for example axial top of one-way clutch mounting portion 114 can be set oil outlet and make,
In engine work, 202 two sides of locking piece always have oil pressure poor, so that one-way clutch 200 be made to be maintained at releasing lock
Determine state.
Claims (10)
1. a kind of hydraulic tappet comprising:
Shell；
The plunger in the shell is partially protruded into, is limited between the axial lower part of the shell and the axial lower part of the plunger
High pressure chest is made, is separately provided for filling the first hole of hydraulic oil to the high pressure chest in the shell and the plunger
Road and the second duct；And
One-way clutch between the plunger and the shell is set, and the one-way clutch is configured to
Switch between lock state and releasing lock state, under the lock state, the one-way clutch allows the plunger
It is stretched out further out from the shell and the plunger is inhibited further to extend inwardly into the shell；It is locked in the releasing
Determine state, the one-way clutch allows the plunger further to extend inwardly into the shell to neutralize from the shell into one
It walks protruding.
2. hydraulic tappet according to claim 1, which is characterized in that when the one-way clutch is not activated, institute
It states one-way clutch and is maintained at the lock state.
3. hydraulic tappet according to claim 1, which is characterized in that the plunger is arranged in the one-way clutch
Between outer peripheral surface and the inner peripheral surface of the shell.
4. hydraulic tappet according to claim 3, which is characterized in that the hydraulic tappet includes that the shell is arranged in
One-way clutch mounting portion at inner peripheral surface.
5. hydraulic tappet according to claim 4, which is characterized in that the one-way clutch includes being arranged in the list
The locking piece is maintained at locking bit by locking piece and locking actuator, the locking actuator into arrangement of clutch mounting portion
It sets or posture.
6. hydraulic tappet according to claim 5, which is characterized in that be provided in the hydraulic tappet lead to it is described unidirectional
The third duct of arrangement of clutch mounting portion, from the third duct, hydraulic oil acts on the locking piece and drives the locking
Part leaves the latched position or posture, so that the one-way clutch is switched to described unlock from the lock state
State.
7. hydraulic tappet according to claim 6, which is characterized in that in the axial direction of the hydraulic tappet, the locking
The upside of the locking piece is arranged in actuator, and the locking piece is ball, and the locking actuator is compressed spring.
8. hydraulic tappet according to claim 7, which is characterized in that pass through the one-way clutch in the hydraulic tappet
In at least one axial cross section of device, the inner wall of the one-way clutch mounting portion includes: along the hydraulic tappet
Axially extending axially extending section；And positioned at described axially extending section of axial downside relative to the axially inclined extension
Inclination extended segment, in the axially extending section of corresponding part, the radial dimension of the one-way clutch mounting portion is equal to
Or the radial dimension slightly larger than the locking piece, so that the locking piece is allowed to move up and down, it is corresponding in the inclination extended segment
Part, the radial dimension of the one-way clutch mounting portion gradually becomes smaller towards axial downside, to inhibit the locking
Downside is mobile in the axial direction for part.
9. hydraulic tappet according to any one of claim 1 to 8, which is characterized in that the hydraulic tappet include around
Its circumferentially distributed multiple one-way clutch.
10. a kind of valve timing system comprising hydraulic tappet according to any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810865397.9A CN109184843A (en) | 2018-08-01 | 2018-08-01 | hydraulic tappet and valve timing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810865397.9A CN109184843A (en) | 2018-08-01 | 2018-08-01 | hydraulic tappet and valve timing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109184843A true CN109184843A (en) | 2019-01-11 |
Family
ID=64920301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810865397.9A Pending CN109184843A (en) | 2018-08-01 | 2018-08-01 | hydraulic tappet and valve timing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109184843A (en) |
-
2018
- 2018-08-01 CN CN201810865397.9A patent/CN109184843A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190111 |