CN113236395A - Actuator mounting structure of variable valve lift system - Google Patents
Actuator mounting structure of variable valve lift system Download PDFInfo
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- CN113236395A CN113236395A CN202110546876.6A CN202110546876A CN113236395A CN 113236395 A CN113236395 A CN 113236395A CN 202110546876 A CN202110546876 A CN 202110546876A CN 113236395 A CN113236395 A CN 113236395A
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- cover
- camshaft
- actuator
- hole
- variable valve
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- 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
- F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
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- 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
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
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- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention provides an actuator mounting structure of a variable valve lift system, and relates to the technical field of automobile variable valve lift systems. The device comprises an actuator body, a cylinder head cover, a camshaft cover and a camshaft which are sequentially arranged; the actuator body is provided with a pin bushing and a first mounting hole; the camshaft cover is also provided with a mounting hole used for being connected with the cylinder cover; the pin bushing penetrates through the mounting through hole in the cylinder head cover and is matched and positioned with the positioning hole in the camshaft cover, the second mounting hole is connected with the first mounting hole through the first fixing piece, the actuator body is matched with the cylinder head cover, and the actuator body is fixedly mounted on the camshaft cover. The invention solves the problems that the load of an engine is increased and the assembly precision of a pin bush of the actuating mechanism is difficult to control when the traditional actuating mechanism is arranged on a cylinder cover, and the tolerance of the actuator relative to a camshaft cover and a camshaft is difficult to control.
Description
Technical Field
The invention relates to the technical field of automobile variable valve lift systems, in particular to an actuator mounting structure of a variable valve lift system.
Background
A cam Sliding type Variable Valve Lift System (Camshaft Sliding Variable Valve Lift System) is characterized in that a cam Sliding sleeve is axially moved on a Camshaft mandrel in the operation process of an engine, so that cams with different lifts are in contact with roller rocker arms, the engine obtains the optimal Valve Lift under the operation working condition, and the fuel economy, power torque and emission characteristics of the engine are improved.
The cam sliding sleeve of the sliding type camshaft moves mainly through the cooperation of a pin of an actuator and a spiral profile on the sliding sleeve. However, since the actuator pin is subjected to a large switching force during switching, the actuator needs to be mounted on a metal component having sufficient strength.
The existing actuator is generally assembled on an aluminum alloy cylinder cover and has the following defects: firstly, the cylinder head cover is made of metal (such as aluminum alloy), so that the weight and the cost of the engine are increased; secondly, the cylinder cover made of aluminum alloy cannot integrate the plastic oil-gas separator, and the plastic oil-gas separator needs to be additionally arranged, so that the arrangement difficulty of the assembly space and higher cost are increased, and the arrangement of boundary parts is influenced; the pin bush of the VVL executor needs higher assembly precision, the cylinder head cover and the camshaft cover are not integrally formed, the VVL executor is assembled on the cylinder head cover, a positioning pin needs to be newly added on the cylinder head cover, and meanwhile, tolerance control of the VVL executor relative to the camshaft cover and the sliding VVL camshaft is more difficult, so that the machining cost and the reliability risk are increased.
CN 212508464U discloses a cam displacement type variable valve lift system, which comprises a valve chamber cover, a plurality of VVL actuators arranged on the valve chamber cover, a cam shaft arranged on the valve cover and positioned below the VVL actuators, and a plurality of sliding sleeves sleeved on the cam shaft corresponding to the VVL actuators; a group of annular limiting grooves are formed in the inner walls of the sliding sleeves, and the cam shaft is in contact with the annular limiting grooves through elastic connecting pieces. It is apparent that in this system, the VVL actuator is directly mounted on the cylinder head cover, which has problems in that the weight and cost of the engine are increased, the accuracy of mounting the pin bush of the VVL actuator is difficult to ensure, and the tolerance of the VVL actuator with respect to the camshaft cover and the sliding VVL camshaft is difficult to control.
Disclosure of Invention
The invention aims to provide an actuator mounting structure of a variable valve lift system, which aims to solve the problems that the load of an engine is increased and the assembly precision of a pin bush of an actuating mechanism is difficult to control when the traditional actuating mechanism is mounted on a cylinder cover, and the tolerance of an actuator relative to a camshaft cover and a camshaft is difficult to control.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an actuator mounting structure of a variable valve lift system comprises an actuator body, a cylinder cover, a camshaft cover and a camshaft which are sequentially arranged;
the actuator body is provided with a pin bushing and a first mounting hole;
the cylinder cover is provided with a mounting through hole for the pin bushing to pass through;
the camshaft cover is provided with a positioning hole and a second mounting hole which are used for assembling the pin bushing, and the camshaft cover is also provided with a mounting hole which is used for being connected with a cylinder cover;
the pin bushing penetrates through an installation through hole in the cylinder head cover and is matched and positioned with a positioning hole in the camshaft cover, and the second installation hole is connected with the first installation hole through the first fixing piece, so that the actuator body is matched with the cylinder head cover and is installed and fixed on the camshaft cover.
Preferably, the pin bushing is integrally formed on the actuator body.
Preferably, the actuator body is provided with a flange, and the flange is provided with the first mounting hole.
Preferably, a sealing groove matched with the flange is formed in the periphery of the edge of the mounting through hole, and a sealing ring is arranged in the sealing groove.
Preferably, a sealing ring for the first fixing member to pass through is further integrally formed in the sealing ring.
Preferably, the edge of the second mounting hole is also annularly provided with an inward concave sealing ring embedded groove for matching with the sealing ring.
Preferably, the outer side of the sealing groove is further provided with a reinforcing rib.
Preferably, the positioning hole is formed in the middle of the camshaft cover, the second mounting holes are symmetrically formed in two sides of the positioning hole, two arc-shaped grooves matched with two shaft necks of the camshaft are formed in the bottom of the camshaft cover, the mounting holes are symmetrically formed in two sides of the two arc-shaped grooves, and the mounting holes are connected to the cylinder cover through second fixing pieces.
Preferably, the first fixing piece and the second fixing piece are both screws.
Preferably, the cylinder head cover is made of plastic.
The invention has the beneficial effects that:
1) according to the actuator mounting structure of the variable valve lift system, the positioning hole for assembling the pin bush and the second mounting hole for fixing the actuator body are integrally designed on the camshaft cover, so that the problem that the load of an engine is increased when the actuator body is mounted on the cylinder cover of the engine is solved; meanwhile, the pin bush of the actuator body is directly assembled in the positioning hole of the camshaft cover, so that the assembling precision of the pin bush is greatly improved, the assembling error between the pin bush and the camshaft cover when the pin bush is installed on the cylinder cover is avoided, and the tolerance control difficulty and the reliability risk of the actuator relative to the camshaft cover and the camshaft are greatly reduced;
2) the sealing groove matched with the flange on the actuator body is arranged around the mounting through hole on the cylinder head cover, the sealing ring is arranged in the sealing groove, the integrally formed sealing ring is arranged on the sealing ring, the bottom surface of the flange is pressed on the sealing ring after the first fixing piece penetrates through the first mounting hole on the flange and the sealing ring and is fixedly connected with the second mounting hole on the camshaft cover, so that the sealing ring is stressed and compressed, the sealing ring is embedded into the embedded groove of the sealing ring and is stressed and compressed, and meanwhile, the sealing performance inside the cylinder head cover and the sealing performance of the actuator are ensured;
3) the two existing adjacent camshaft covers are integrated into a whole, so that the two ends of the camshaft covers are arc-shaped grooves matched with the shaft necks, and the middle of the camshaft covers is provided with a mounting hole and a positioning hole for fixing an actuating mechanism and assembling a pin bush, the assembling precision of the pin bush is further improved, the assembling error between the pin bush and the camshaft covers when the pin bush is installed on the cylinder cover is avoided, and the tolerance control difficulty and the reliability risk of an actuator relative to the camshaft covers and the camshaft are further reduced;
4) through installing the executor body on the camshaft cover for the cylinder head cover can be made by plastics, and other spare parts such as integrated plastics oil and gas separator have realized the lightweight of cylinder head cover, and have reduced and have arranged the degree of difficulty and manufacturing cost, in variable valve lift system field, have and promote practical value.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an exploded view of FIG. 1;
fig. 3 is a cross-sectional view taken along a-a in fig. 1.
1-an actuator body, 101-a pin bushing, 102-a first mounting hole and 103-a flange; 2-a cylinder head cover, 201-an installation through hole, 202-a sealing groove and 203-a reinforcing rib; 3-camshaft cover, 301-positioning hole, 302-second mounting hole, 303-mounting hole, 304-sealing ring embedded groove and 305-arc groove; 4-camshaft, 401-journal; 5-a first fixing piece; 6-sealing ring, 601-sealing ring; 7-second fixing piece.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure herein, wherein the embodiments of the present invention are described in detail with reference to the accompanying drawings and preferred embodiments. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
As shown in fig. 1 to 3, an actuator mounting structure of a variable valve lift system includes an actuator body 1, a cylinder head cover 2, a camshaft cover 3, and a camshaft 4, which are sequentially disposed;
the actuator body 1 is provided with a pin bushing 101 and a first mounting hole 102;
the cylinder head cover 2 is provided with a mounting through hole 201 for the pin bushing 101 to pass through;
the camshaft cover 3 is provided with a positioning hole 301 and a second mounting hole 302 for assembling the pin bushing 101, and the camshaft cover 3 is also provided with a mounting hole 303 for connecting with a cylinder head;
the pin bushing 101 penetrates through the mounting through hole 201 in the cylinder head cover 2 and is matched and positioned with the positioning hole 301 in the camshaft cover 3, the second mounting hole 302 is connected with the first mounting hole 102 through the first fixing piece 5, and the actuator body 1 is matched with the cylinder head cover 2 and is fixedly mounted on the camshaft cover 3.
The positioning hole for assembling the pin bush and the second mounting hole for fixing the actuator body are integrally designed on the camshaft cover, so that the problem that the load of an engine is increased when the actuator body is mounted on an engine cylinder cover is solved; meanwhile, the pin bushing of the actuator body is directly assembled in the positioning hole of the camshaft cover, so that the assembling precision of the pin bushing is greatly improved, the assembling error between the pin bushing and the camshaft cover when the pin bushing is installed on the cylinder cover is avoided, and the tolerance control difficulty and the reliability risk of the actuator relative to the camshaft cover and the camshaft are greatly reduced.
The pin bush 101 is integrally formed on the actuator body 1.
Fig. 3 is a sectional view taken along a-a in fig. 1, that is, a sectional view taken along the axial direction of the camshaft in fig. 1.
The actuator body 1 is provided with a flange 103, and a first mounting hole 102 is formed in the flange 103.
In this embodiment, the first mounting holes 102 include two holes, which are symmetrically disposed on two sides of the flange 103. So set up to improve the steadiness of installation.
And a sealing groove 202 matched with the flange 103 is arranged around the edge of the mounting through hole 201, and a sealing ring 6 is arranged in the sealing groove 202. Wherein, the seal ring 6 is a rubber seal ring.
A sealing ring 601 for the first fixing member 5 to pass through is also integrally formed in the sealing ring 6.
In this embodiment, the outer edge of the sealing groove 202 has the same shape as the outer edge of the flange 103 and is slightly smaller than the flange. Therefore, on the premise of ensuring the sealing performance in the cylinder head cover, the lightweight of parts is realized.
The edge of the second mounting hole 302 is also formed with an inwardly concave sealing ring insert groove 304 circumferentially for mating with the sealing ring 601.
Through set up the seal groove that matches with the flange on the executor body around the installation via hole on the cylinder head cover, set up the sealing washer in the seal groove, and set up integrated into one piece's sealing ring on the sealing washer, after first mounting passed first mounting hole and the sealing ring on the flange, when carrying out fixed connection with the second mounting hole on the camshaft lid, the flange bottom surface is pressed on the sealing washer, make the sealing washer atress compress, and in the sealing washer embedding sealing ring embedded groove, and the atress compresses, and simultaneously, the leakproofness of the inside leakproofness of cylinder head cover and executor has been guaranteed.
A reinforcing rib 203 is further provided outside the sealing groove 202. Wherein, all can suit and the interval sets up the strengthening rib around the periphery of seal groove.
And reinforcing ribs are arranged around the sealing groove, so that the rigidity strength of the mounting through hole of the cylinder cover and the sealing groove is ensured.
The middle of the camshaft cover 3 is provided with a positioning hole 301, two sides of the positioning hole 301 are symmetrically provided with second mounting holes 302, the bottom of the camshaft cover 3 is provided with two arc-shaped grooves 305 matched with two shaft necks 401 of the camshaft 4, two sides of the two arc-shaped grooves 305 are symmetrically provided with mounting holes 303, and the mounting holes 303 are connected to the cylinder cover through second fixing pieces 7.
This embodiment, through carrying out integrated design as an organic whole with two adjacent camshaft covers now, make its both ends be the arc wall that matches with the axle journal, the centre forms mounting hole and the locating hole that is used for fixed actuating mechanism and assembly pin bush, also can be simultaneously carry out integrated design as an organic whole with a plurality of current camshaft covers, so the interval arrange the arc wall with be used for fixed actuating mechanism and assembly pin bush mounting hole and locating hole can, the assembly precision of pin bush has further been improved, when having avoided pin bush to install on the cylinder head covers, and the assembly error that exists between the camshaft cover, and the tolerance control degree of difficulty of the relative camshaft cover of executor and camshaft has further been reduced, and the reliability risk.
The actuator mounting structure of the variable valve lift system provided by the embodiment is particularly suitable for mounting a VVL actuator of a sliding type camshaft.
The first fixing member 5 and the second fixing member 7 are both screws.
The cylinder head cover 2 is made of plastic. Through installing the executor body on the camshaft lid for the cylinder head cover can be made by plastics, and other spare parts such as integrated plastics oil and gas separator have realized the lightweight of cylinder head cover, and have reduced and have arranged the degree of difficulty and manufacturing cost.
According to the actuator mounting structure of the variable valve lift system, firstly, the positioning hole for assembling the pin bush and the second mounting hole for fixing the actuator body are integrally designed on the camshaft cover, so that the problem that the load of an engine is increased when the actuator body is mounted on an engine cylinder cover is solved; meanwhile, the pin bush of the actuator body is directly assembled in the positioning hole of the camshaft cover, so that the assembling precision of the pin bush is greatly improved, the assembling error between the pin bush and the camshaft cover when the pin bush is installed on the cylinder cover is avoided, and the tolerance control difficulty and the reliability risk of the actuator relative to the camshaft cover and the camshaft are greatly reduced; secondly, a sealing groove matched with a flange on the actuator body is arranged around the mounting through hole on the cylinder head cover, a sealing ring is arranged in the sealing groove, an integrally formed sealing ring is arranged on the sealing ring, after the first fixing piece penetrates through the first mounting hole and the sealing ring on the flange, when the first fixing piece is fixedly connected with the second mounting hole on the camshaft cover, the bottom surface of the flange is pressed on the sealing ring, so that the sealing ring is stressed and compressed, the sealing ring is embedded into the embedded groove of the sealing ring and stressed and compressed, and meanwhile, the sealing performance inside the cylinder head cover and the sealing performance of the actuator are ensured; then, the two adjacent camshaft covers are integrally designed into a whole, so that the two ends of the camshaft covers are arc-shaped grooves matched with the shaft necks, and the middle of the camshaft covers is provided with a mounting hole and a positioning hole for fixing an actuating mechanism and assembling a pin bush, thereby further improving the assembling precision of the pin bush, avoiding the assembling error between the pin bush and the camshaft covers when the pin bush is arranged on the cylinder cover, and further reducing the tolerance control difficulty and the reliability risk of the actuator relative to the camshaft covers and the camshafts; finally, through installing the executor body on the camshaft cover for the cylinder head cover can be made by plastics, and other spare parts such as integrated plastics oil and gas separator have realized the lightweight of cylinder head cover, and have reduced and have arranged the degree of difficulty and manufacturing cost, in variable valve lift system field, have and promote practical value.
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention.
Claims (10)
1. An actuator mounting structure of a variable valve lift system is characterized by comprising an actuator body (1), a cylinder head cover (2), a camshaft cover (3) and a camshaft (4) which are sequentially arranged;
the actuator body (1) is provided with a pin bushing (101) and a first mounting hole (102);
the cylinder head cover (2) is provided with a mounting through hole (201) for the pin bushing (101) to pass through;
the camshaft cover (3) is provided with a positioning hole (301) and a second mounting hole (302) for assembling the pin bushing (101), and the camshaft cover (3) is also provided with a mounting hole (303) for connecting with a cylinder cover;
the pin bushing (101) penetrates through an installation through hole (201) in the cylinder head cover (2) and is matched and positioned with a positioning hole (301) in the camshaft cover (3), the second installation hole (302) is connected with the first installation hole (102) through a first fixing piece (5), and the actuator body (1) is matched with the cylinder head cover (2) and is installed and fixed on the camshaft cover (3).
2. Actuator mounting structure of a variable valve lift system according to claim 1, characterized in that the pin bushing (101) is designed integrally on the actuator body (1).
3. The actuator mounting structure of a variable valve lift system according to claim 1, wherein the actuator body (1) has a flange (103), and the flange (103) is provided with the first mounting hole (102).
4. The actuator mounting structure of a variable valve lift system according to claim 3, wherein a sealing groove (202) matched with the flange (103) is formed around the edge of the mounting through hole (201), and a sealing ring (6) is arranged in the sealing groove (202).
5. The actuator mounting structure of a variable valve lift system according to claim 4, characterized in that a seal ring (601) for the first fixing member (5) to pass through is further integrally formed in the seal ring (6).
6. The actuator mounting structure of a variable valve lift system according to claim 5, wherein the edge of the second mounting hole (302) is further formed with an inward concave sealing ring embedded groove (304) in an annular direction for mating with the sealing ring (601).
7. The actuator mounting structure of a variable valve lift system according to claim 4, wherein a reinforcing rib (203) is further provided outside the sealing groove (202).
8. The actuator mounting structure of a variable valve lift system according to claim 1, wherein the camshaft cover (3) has the positioning hole (301) in the middle, the second mounting hole (302) is symmetrically provided on both sides of the positioning hole (301), the bottom of the camshaft cover (3) has two arc-shaped grooves (305) adapted to two journals (401) of the camshaft (4), the mounting holes (303) are symmetrically provided on both sides of the two arc-shaped grooves (305), and the mounting holes (303) are connected to the cylinder head through second fixing members (7).
9. The actuator mounting structure of a variable valve lift system according to claim 8, wherein the first fixing member (5) and the second fixing member (7) are both screws.
10. Actuator mounting structure of a variable valve lift system according to claim 1, characterized in that the cylinder head cover (2) is made of plastic.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110546876.6A CN113236395B (en) | 2021-05-19 | 2021-05-19 | Actuator mounting structure of variable valve lift system |
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| CN202110546876.6A CN113236395B (en) | 2021-05-19 | 2021-05-19 | Actuator mounting structure of variable valve lift system |
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| CN113236395A true CN113236395A (en) | 2021-08-10 |
| CN113236395B CN113236395B (en) | 2023-03-24 |
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