CN110159381B - Cam tappet subassembly, valve actuating mechanism and engine - Google Patents
Cam tappet subassembly, valve actuating mechanism and engine Download PDFInfo
- Publication number
- CN110159381B CN110159381B CN201910580866.7A CN201910580866A CN110159381B CN 110159381 B CN110159381 B CN 110159381B CN 201910580866 A CN201910580866 A CN 201910580866A CN 110159381 B CN110159381 B CN 110159381B
- Authority
- CN
- China
- Prior art keywords
- tappet
- cam
- face
- rotate
- lifter
- 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.)
- Active
Links
Images
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
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
The invention relates to the technical field of engine valve distribution and discloses a cam tappet assembly, a valve distribution mechanism and an engine. According to the cam tappet assembly, the driving portion is arranged at one axial end of the cam base circle region, the matching portions distributed along the circumferential direction of the tappet are arranged at one end of the tappet, and in the process that the base circle region of the cam is in contact with the lower end face of the tappet, the driving portion acts on the matching portions to drive the tappet to rotate, so that the driving portion periodically drives the matching portions to drive the tappet to rotate. When the cam rotates for one period, the cam pushes the matching part to drive the tappet to rotate for an angle through the driving part, and then the position of the lower end face of the tappet in line contact with the cam in the next rotation period is changed, namely, the cam periodically drives the tappet to rotate for a certain angle, so that the abrasion uniformity of the lower end face of the tappet is improved, and the stability of the overall performance of the valve actuating mechanism is ensured.
Description
Technical Field
The invention relates to the technical field of engine valve distribution, in particular to a cam tappet assembly, a valve distribution mechanism and an engine.
Background
The cam shaft is an important part for controlling the opening and closing of the valve in the reciprocating engine, the cam matched with the tappet is arranged on the cam shaft, the cam is in line contact with the tappet, and in the rotating process of the cam, the cam pushes the tappet to move up and down, and the tappet pushes the push rod to move up and down.
In the process, the cam is in line contact with the tappet, the cam slides on the lower end face of the tappet, when the base circle area of the cam is in contact with the lower end face of the tappet, the acting force between the cam and the tappet is zero, at the moment, the tappet can rotate or not rotate under the action of the cam, so that the lower end face of the tappet is eccentric and abraded in the rotating process of the cam, the abrasion uniformity of the lower end face of the tappet is poor, and the overall function of the valve air distribution mechanism is further influenced.
Disclosure of Invention
The invention aims to provide a cam tappet assembly, a valve distribution mechanism and an engine, which can ensure the abrasion uniformity of the lower end surface of a tappet.
In order to achieve the purpose, the invention adopts the following technical scheme:
the cam tappet assembly comprises a tappet and a rotatable cam shaft, wherein a cam capable of driving the tappet to move axially is arranged on the cam shaft, a driving part is arranged at one axial end of a cam base circle region, a matching part distributed along the circumferential direction of the matching part is arranged at one end of the tappet, and the driving part is configured to periodically push the matching part to drive the tappet to rotate.
As a preferable technical solution of the cam tappet assembly, an outer diameter of the lower end surface of the tappet is greater than an axial length of the cam, a working area having the axial length of the cam as a diameter and a center of the lower end surface of the tappet as a circle center is formed on the lower end surface of the tappet, and the fitting portion is located on the lower end surface of the tappet outside the working area.
As a preferable technical solution of the cam tappet assembly, an outer diameter of the lower end surface of the tappet is greater than or equal to an axial length of the cam, and the matching portions are circumferentially distributed along an outer peripheral wall of one end of the tappet.
As a preferable aspect of the cam lifter assembly, the driving portion includes a stopper provided at one axial end of the cam base circle region.
As a preferable technical solution of the cam lifter assembly, the engagement portion includes a plurality of protrusions protruding toward a side where the cam is located, and the plurality of protrusions are distributed at equal intervals along a circumferential direction of the lifter.
As a preferable technical solution of the above cam lifter assembly, the stopper is provided with a plurality of slots which are circumferentially distributed along the cam and can be engaged with the protrusions.
As a preferable technical solution of the cam tappet assembly, the matching portion includes a plurality of slots distributed along the circumferential direction of the tappet, and the slots are formed by recessing the lower end of the tappet toward the upper end of the tappet; the driving part comprises a plurality of protrusions which are distributed along the circumferential direction of the cam and can be engaged with the slots.
In a preferred embodiment of the cam lifter assembly, the engagement portion is a first friction belt that is projected from the lifter toward the cam, and the driving portion is a second friction belt that is projected from the cam toward the lifter and is capable of coming into contact with the first friction belt.
The invention also provides a valve actuating mechanism which comprises the cam tappet assembly.
The invention also provides an engine which comprises the valve actuating mechanism.
The invention has the beneficial effects that: according to the tappet, the driving part is arranged at one axial end of the cam base circle region, the matching parts distributed along the circumferential direction of the tappet are arranged at one end of the tappet, and in the process that the base circle region of the cam is in contact with the lower end face of the tappet, the driving part acts on the matching parts to drive the tappet to rotate, so that the driving part periodically drives the matching parts to drive the tappet to rotate. When the cam rotates for one period, the cam drives the matching part to drive the tappet to rotate for an angle through the driving part, and then the position of the lower end face of the tappet in line contact with the cam in the next rotation period is changed, namely, the cam periodically drives the tappet to rotate for a certain angle, so that the abrasion uniformity of the lower end face of the tappet is improved, and the stability of the overall performance of the valve actuating mechanism is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a schematic structural view of a cam lifter assembly according to an embodiment of the present invention;
FIG. 2 is a graph of camshaft rotation angle versus pushrod strain during a complete operation of a valve train according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a tappet according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a camshaft according to a first embodiment of the present invention.
In the figure:
1. a tappet; 11. a protrusion;
2. a camshaft; 21. a cam; 22. a stopper; 221. and (4) a slot.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
Example one
Fig. 1 is a schematic structural diagram of a cam tappet assembly provided in this embodiment, and as shown in fig. 1, the present embodiment provides a cam tappet assembly, which includes a tappet 1 and a rotatable camshaft 2, a cam 21 capable of driving the tappet 1 to move axially is disposed on the camshaft 2, and the tappet 1 is pushed to move axially in a rotating process of the cam 21.
Fig. 2 is a graph showing a relationship between a cam shaft rotation angle and a push rod strain during a complete operation of the valve actuating mechanism according to this embodiment, and as can be seen from fig. 2, in a process that a base circle region of the cam 21 contacts a lower end surface of the tappet 1, when the push rod strain becomes zero, the push rod is stressed to be zero, when the cam 21 is located at a bottom dead center, and an acting force between the cam 21 and the tappet 1 is also zero.
Fig. 3 is a schematic structural diagram of a tappet provided in this embodiment, fig. 4 is a schematic structural diagram of a camshaft provided in this embodiment, as shown in fig. 3 and fig. 4, in this embodiment, a driving portion is disposed at one axial end of a base circle region of a cam 21, an end of a tappet 1 is disposed with an engaging portion distributed along a circumferential direction thereof, and the driving portion is configured to periodically push the engaging portion to drive the tappet 1 to rotate.
In the process that the base circle area of the cam 21 is in contact with the lower end face of the tappet 1, one side of the driving portion, facing the rotating direction of the cam 21, acts on one side of the matching portion, facing away from the rotating direction of the cam 21, so as to push the matching portion to drive the tappet 1 to rotate. Every time the cam 21 rotates for one period, the cam 21 drives the tappet 1 to rotate for an angle through the driving part pushing the matching part, then the position of line contact with the cam 21 on the lower end face of the tappet 1 in the next rotation period is changed, namely, the cam 21 periodically drives the tappet 1 to rotate for a certain angle, so that the abrasion uniformity of the lower end face of the tappet 1 is improved, and the stability of the overall performance of the valve air distribution mechanism is ensured.
In this embodiment, the outer diameter of the lower end surface of the tappet 1 is greater than the axial length of the cam 21, a working area with the axial length of the cam 21 as a diameter and the center of the lower end surface of the tappet 1 as a circle center is formed on the lower end surface of the tappet 1, and the matching portion is located on the lower end surface of the tappet 1 outside the working area, so that the integrity of the linear contact between the cam 21 and the tappet 1 is ensured through the above arrangement, and the arrangement of the driving portion and the matching portion does not affect the normal operation of the cam 21 and the tappet 1.
Further, as shown in fig. 4, the driving portion includes a stopper 22 disposed at one axial end of the base circle region of the cam 21, and when the base circle region of the cam 21 contacts the lower end surface of the tappet 1, the stopper 22 will act on the engaging portion to push the engaging portion to drive the tappet 1 to rotate.
Further, as shown in fig. 3, the engagement portion includes a plurality of protrusions 11 protruding toward the side where the cam 21 is located, and the plurality of protrusions 11 are distributed at equal intervals along the circumferential direction of the lower end surface of the tappet 1. When the base circle area of the cam 21 contacts the lower end surface of the tappet 1, the stop 22 will act on one of the protrusions 11 to push the protrusion 11 to rotate the tappet 1.
Further, as shown in fig. 4, the stopper 22 is provided with a plurality of slots 221 which are distributed along the circumferential direction of the cam 21 and can be engaged with the protrusions 11. When the base circle area of the cam 21 contacts the lower end surface of the tappet 1, the protrusion 11 is engaged with the slot 221, so that the rotation angles of the tappet 1 in the same direction are the same every time the cam 21 rotates for one period, and the wear uniformity of the lower end surface of the tappet 1 is further ensured.
Further, the protrusion 11 may be a hemispherical protrusion, a rectangular protrusion or a tooth extending in the radial direction of the lower end surface of the tappet 1, or the like. Preferably, the protrusion 11 is a rectangular protrusion extending radially along the lower end surface of the tappet 1, and accordingly, the insertion groove 221 is a rectangular groove engaged with the rectangular protrusion, and the rectangular groove is distributed along the axial direction of the cam 21.
The embodiment also provides a valve actuating mechanism which comprises the cam tappet assembly.
The embodiment also provides an engine comprising the valve actuating mechanism.
Example two
The present embodiment is different from the first embodiment in that the engagement portion includes a plurality of slots 221 that are equally spaced in the circumferential direction of the lower end surface of the tappet 1, and the stopper 22 is provided with a plurality of protrusions 11 that are distributed in the circumferential direction of the cam 21 and can engage with the slots 221.
Other structures in this embodiment are the same as those in the first embodiment, and are not described in detail here.
EXAMPLE III
The present embodiment is different from the first embodiment in that the outer diameter of the lower end surface of the tappet 1 is equal to or greater than the axial length of the cam 21, and the engagement portions are circumferentially distributed along the outer peripheral wall of one end of the tappet 1, where the outer peripheral wall of one end of the tappet 1 refers to the outer peripheral wall of the tappet 1 that is connected to the lower end surface of the tappet 1.
Specifically, the engaging portion is a plurality of protrusions 11 disposed on the outer peripheral wall and distributed at equal intervals along the circumferential direction, and the protrusions 11 are protruded toward the cam 21, that is, the lower surface of the protrusions 11 is located below the lower surface of the tappet 1. One axial end of the base circle area of the tappet 1 is provided with a stop 22, and the stop 22 is provided with a slot 221 matched with the bulge 11.
Every time the cam 21 rotates for one period, the protrusion 11 will be inserted into one slot 221 and gradually disengage from the slot 221 as the cam 21 rotates, and the stopper 22 forming the slot 221 will push the protrusion 11 to rotate, which in turn drives the tappet 1 to rotate.
Other structures in this embodiment are the same as those in the first embodiment, and are not described in detail here.
Example four
The present embodiment is different from the third embodiment in that the engagement portion is a plurality of slots 221 that are equally spaced in the circumferential direction along the outer peripheral wall of the lower end of the tappet 1, the driving portion is a stopper 22 that is provided at one axial end of the base circle region of the cam 21 and projects toward the side where the tappet 1 is located, and the stopper 22 is provided with a plurality of protrusions 11 that are distributed in the circumferential direction of the cam 21 and can engage with the slots 221.
Specifically, the outer peripheral wall of the lower end of the tappet 1 is provided with a plurality of lugs extending along the radial direction of the tappet in the direction away from the center of the tappet, the lower end surface of each lug and the lower end surface of the tappet 1 are located at the same height, the lugs are distributed at equal intervals along the circumferential direction of the tappet 1, and a slot 221 is formed in the area between two adjacent lugs.
Each time the cam 21 rotates for one cycle, the protrusion 11 will be inserted into one slot 221 to push the protrusion forming one side of the slot 221 to rotate, which in turn drives the tappet 1 to rotate.
Other structures in this embodiment are the same as those in the first embodiment, and are not described in detail here.
EXAMPLE five
The present embodiment differs from the other embodiments in that the present embodiment periodically rotates the tappet 1 by increasing the friction between the cam 21 and the tappet 1 when the base circle region of the cam 21 engages with the tappet 1.
Specifically, the cooperation portion is the first friction area that is convexly established to cam 21 by tappet 1, and the drive portion is the second friction area that is convexly established and can butt in first friction area to tappet 1 by cam 21, and when the base circle region of cam 21 cooperates with tappet 1, first friction area and second friction area butt to increase the frictional force between cam 21 and tappet 1, make cam 21 can drive tappet 1 and rotate, when non-base circle region on cam 21 cooperates with tappet 1, first friction area and second friction area separation realize that cam 21 periodically drives tappet 1 and rotate.
Preferably, the first friction belt and the second friction belt may be a friction belt of a pockmark structure, a friction belt of a twill structure, or the like, and both of the friction belt structures specifically proposed above are related to the prior art and are not described in detail herein, and of course, other types of friction belts in the related art may be used and are not described herein.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Claims (8)
1. A cam tappet assembly comprises a tappet (1) and a rotatable cam shaft (2), wherein a cam (21) capable of driving the tappet (1) to axially move is arranged on the cam shaft (2), and the cam tappet assembly is characterized in that a driving part is arranged at one axial end of a base circle region of the cam (21), a matching part distributed along the circumferential direction of the tappet (1) is arranged at one end of the tappet (1), and the driving part is configured to periodically push the matching part to drive the tappet (1) to rotate;
the outer diameter of the lower end face of the tappet (1) is larger than the axial length of the cam (21), a working area which takes the axial length of the cam (21) as the diameter and the center of the lower end face of the tappet (1) as the circle center is formed on the lower end face of the tappet (1), and the matching part is positioned on the lower end face of the tappet (1) outside the working area;
the matching part comprises a plurality of inserting grooves (221) distributed along the circumferential direction of the tappet (1), and the inserting grooves (221) are formed by the fact that the lower end of the tappet (1) faces the upper end of the tappet (1) in a concave mode; the driving part comprises a plurality of protrusions (11) which are distributed along the circumferential direction of the cam (21) and can be engaged with the insertion grooves (221).
2. The cam tappet assembly according to claim 1, wherein the outer diameter of the lower end surface of the tappet (1) is equal to or greater than the axial length of the cam (21), and the engagement portion is circumferentially distributed along the outer circumferential wall of one end of the tappet (1).
3. The cam lifter assembly according to claim 1 or 2, characterized in that the drive portion comprises a stop (22) provided at one axial end of a base circle region of the cam (21).
4. The cam lifter assembly according to claim 3, characterized in that the engagement portion comprises a plurality of protrusions (11) protruding to the side of the cam (21), the plurality of protrusions (11) being circumferentially distributed along the lifter (1).
5. Cam lifter assembly according to claim 4, characterized in that the stop (22) is provided with a plurality of slots (221) distributed circumferentially along the cam (21) and capable of engaging with the projections (11).
6. The cam lifter assembly according to claim 1 or 2, characterized in that the engagement portion is a first friction band protruding from the lifter (1) toward the cam (21), and the driving portion is a second friction band protruding from the cam (21) toward the lifter (1) and capable of abutting against the first friction band.
7. A valve train comprising the cam lifter assembly of any of claims 1 to 6.
8. An engine comprising the valve train of claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910580866.7A CN110159381B (en) | 2019-06-29 | 2019-06-29 | Cam tappet subassembly, valve actuating mechanism and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910580866.7A CN110159381B (en) | 2019-06-29 | 2019-06-29 | Cam tappet subassembly, valve actuating mechanism and engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110159381A CN110159381A (en) | 2019-08-23 |
| CN110159381B true CN110159381B (en) | 2020-06-26 |
Family
ID=67637342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910580866.7A Active CN110159381B (en) | 2019-06-29 | 2019-06-29 | Cam tappet subassembly, valve actuating mechanism and engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110159381B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012072671A (en) * | 2010-09-28 | 2012-04-12 | Hitachi Automotive Systems Ltd | Valve lifter for internal combustion engine |
| CN204921070U (en) * | 2015-09-18 | 2015-12-30 | 丁丹巧 | Ejector pin |
| CN106368756A (en) * | 2016-08-30 | 2017-02-01 | 安徽全柴动力股份有限公司 | Engine tappet, camshaft and transmission mechanism of engine tappet and camshaft |
| CN107084013A (en) * | 2017-06-21 | 2017-08-22 | 浙江春风动力股份有限公司 | Engine and its cam assembly |
| CN107288698B (en) * | 2017-07-31 | 2019-06-04 | 重庆长安汽车股份有限公司 | A kind of valve rotating mechanism |
-
2019
- 2019-06-29 CN CN201910580866.7A patent/CN110159381B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110159381A (en) | 2019-08-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2015508139A (en) | Followers mechanism | |
| KR20140090654A (en) | Latch pin assembly ; rocker arm arrangement using latch pin assembly ; and assembling methods | |
| US9097296B2 (en) | Sealed one way roller clutch | |
| US20130104818A1 (en) | Tappet | |
| KR101931426B1 (en) | Follower mechanism | |
| US4494636A (en) | One-way clutch | |
| JPS63235735A (en) | Roller synchronizing type one-way clutch | |
| US20110011361A1 (en) | Coupling device | |
| CN110159381B (en) | Cam tappet subassembly, valve actuating mechanism and engine | |
| US9885330B1 (en) | High-pressure fuel pump actuator used in engine | |
| US10047641B2 (en) | Roller lifter | |
| JP2005509782A (en) | Pump member and piston pump for generating high-pressure fuel | |
| KR100415333B1 (en) | Roller clutch having interlocking cage segments | |
| CN110319016B (en) | Axial limiting assembly, scroll compressor and air conditioner | |
| JP6868130B2 (en) | Driven mechanism with anti-rotation function | |
| GB2581006A (en) | Crowned anti-rotation device for cirumferential seals | |
| JPH08247173A (en) | Roller clutch | |
| CN110388391B (en) | Roller type overrunning clutch | |
| CN111601964B (en) | Tappet for fuel pump | |
| CN208803245U (en) | A kind of winder for preventing peg or spindle from dallying | |
| CN218165089U (en) | Hanging rack | |
| CN105526167A (en) | Compression mechanism for rotary compressor, and rotary compressor with same | |
| JP2003056601A (en) | One-way clutch | |
| KR100355956B1 (en) | Ball joint piston assembly with self-aligning function | |
| CN219366643U (en) | One-way clutch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |