CN107100691B - Hydraulic variable valve timing mechanism - Google Patents
Hydraulic variable valve timing mechanism Download PDFInfo
- Publication number
- CN107100691B CN107100691B CN201710533740.5A CN201710533740A CN107100691B CN 107100691 B CN107100691 B CN 107100691B CN 201710533740 A CN201710533740 A CN 201710533740A CN 107100691 B CN107100691 B CN 107100691B
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- China
- Prior art keywords
- main
- base
- push rod
- cam shaft
- engine
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Classifications
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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
- F01L1/344—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 changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/34413—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 changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using composite camshafts, e.g. with cams being able to move relative to the camshaft
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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
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
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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
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L2001/0471—Assembled camshafts
- F01L2001/0473—Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod
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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
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L2001/0475—Hollow camshafts
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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
Abstract
The invention discloses a hydraulic variable valve timing mechanism, which belongs to the technical field of engine gas distribution timing and comprises a main camshaft and a main camshaft gear, wherein a main cam is arranged on the main camshaft; the main cam shaft is of a hollow structure, an auxiliary cam shaft is coaxially arranged in the main cam shaft, a swing arm is arranged at one end of the auxiliary cam shaft, an auxiliary cam is eccentrically arranged on the auxiliary cam shaft, and the auxiliary cam penetrates through the periphery of the main cam shaft and is arranged close to one end of the main cam; the oil pump is characterized in that a base is arranged on the main camshaft gear, an engine oil inlet is formed in the base, a push rod is slidably mounted in the base, one end of the push rod extends out of the base and abuts against the swing arm, and an elastic return element used for enabling the push rod to return is further arranged in the base. The invention ensures the comprehensive performance of the engine at high rotating speed, improves the economy, the dynamic property and the emission performance of the engine, and has positive effects on the aspects of energy conservation and emission reduction of the engine.
Description
Technical Field
The invention belongs to the technical field of engine valve timing, and particularly relates to a hydraulic variable valve timing mechanism.
Background
The opening time of the traditional engine valve is controlled by a single camshaft, and the valve opening time cannot be changed along with the improvement of the rotating speed and the load, so that the defects of poor economy, poor emission performance, poor dynamic performance and the like are exposed when the rotating speed and the load are high.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the hydraulic variable valve timing mechanism is provided to solve the technical problem that when the rotating speed of a traditional engine is increased, the opening time of a valve is not variable, and the air inlet of the engine is insufficient after the rotating speed is increased in the running process of the engine.
In order to solve the technical problems, the technical scheme of the invention is as follows: the hydraulic variable valve timing mechanism comprises a main camshaft and a main camshaft gear arranged at one end of the main camshaft, wherein a main cam is arranged on the main camshaft; the main camshaft is of a hollow structure, an auxiliary camshaft is coaxially arranged in the main camshaft, one end of the auxiliary camshaft is provided with a swing arm, the swing arm and the main camshaft gear are positioned at the same end, an auxiliary cam is eccentrically arranged on the auxiliary camshaft, and the auxiliary cam penetrates through the periphery of the main camshaft and is arranged close to one end of the main cam; the oil pump is characterized in that a base is arranged on the main camshaft gear, an engine oil inlet is formed in the base, a push rod is slidably mounted in the base, one end of the push rod extends out of the base and abuts against the swing arm, and an elastic return element used for enabling the push rod to return is further arranged in the base.
As an improvement, the hydraulic variable valve timing mechanism further includes:
the fixing seat is provided with a main oil duct;
the adapter plate is fixedly arranged on the main camshaft gear, and a first oil duct communicated with the engine oil inlet is arranged on the adapter plate;
the piston is arranged between the fixed seat and the adapter disc, a second oil duct is arranged on the piston and is respectively communicated with the main oil duct and the first oil duct, and an end face seal is arranged between the piston and the adapter disc.
As an improvement, the swing arm is provided with a sliding groove matched with the extending end of the push rod.
As an improvement, a positioning sleeve used for limiting the position of the push rod is further arranged in the base, and a third oil duct communicated with the engine oil inlet is arranged on the positioning sleeve.
As an improvement, the elastic return element is a return spring sleeved on the push rod, one end of the return spring is abutted against the base, and the other end of the return spring is abutted against the push rod.
After the technical scheme is adopted, the invention has the beneficial effects that:
an auxiliary camshaft is coaxially arranged inside a main camshaft of the hydraulic variable valve timing mechanism, a swing arm is arranged at one end of the auxiliary camshaft, and an auxiliary cam is eccentrically arranged on the auxiliary camshaft; the engine oil is fed into the base through the engine oil inlet, the push rod extends outwards under the action of the engine oil pressure to push the swing arm to rotate, so that the auxiliary camshaft generates a relative angle relative to the main camshaft, and after the auxiliary cam rotates relative to the main cam to complete the required angle, the auxiliary camshaft and the main camshaft keep the angular speed synchronous, so that the valve opening time is advanced, and at the moment, the valve opening time is controlled by the main cam and the auxiliary cam at the same time, so that the valve timing is changed; when the load of the engine is reduced and the rotating speed is reduced, the pressure of engine oil is reduced, the push rod retracts under the action of the elastic return element, the swing arm rotates reversely, the auxiliary cam returns to the original position, the relative angle difference between the main cam and the auxiliary cam is eliminated, and the opening time of the valve is controlled by the main cam shaft.
The hydraulic variable valve timing mechanism provided by the invention is controlled by engine oil, an additional electric control mechanism is not needed, the structure is simple, and meanwhile, the electric control part is not needed to be subjected to insulation treatment, so that the reliability is improved; the comprehensive performance of the engine at high rotating speed is ensured, the economical efficiency, the dynamic property and the emission performance of the engine are improved, and the energy-saving and emission-reducing engine has positive effects on the aspects of energy conservation and emission reduction of the engine.
Because the hydraulic variable valve timing mechanism further comprises a fixed seat, a switching disc and a piston, engine oil in the main oil passage can enter an engine oil inlet through the second oil passage and the first oil passage; because the piston with be end face seal between the switching dish, prevent that machine oil from revealing.
Because the swing arm is provided with the sliding groove, the sliding groove plays a role in restraining the motion of the extending end of the push rod, and therefore the swing arm moves accurately.
Because the positioning sleeve is provided with the third oil duct, the engine oil entering the base from the engine oil inlet can act on the push rod through the third oil duct.
Because the elastic return element is a return spring sleeved on the push rod, the elastic return element has a simple structure.
Drawings
FIG. 1 is a schematic structural view of an embodiment of the present invention (in which the mounting block, the piston and the adapter plate are not assembled);
FIG. 2 is a partial cross-sectional view of FIG. 1;
FIG. 3 is a cross-sectional view of the base, retaining sleeve, push rod and return spring of FIG. 1;
FIG. 4 is an exploded view of FIG. 3;
FIG. 5 is a partial cross-sectional view from another perspective of an embodiment of the present invention;
FIG. 6 is an enlarged partial schematic view of the primary and secondary cams of FIG. 1;
in the figure: 1-a main camshaft, 2-a main camshaft gear, 3-a main cam, 4-an auxiliary camshaft, 5-a swing arm, 51-a chute, 6-an auxiliary cam, 7-a base, 71-an engine oil inlet, 8-a push rod, 9-a fixed seat, 91-a main oil channel, 10-an adapter plate, 101-a first oil channel, 11-a piston, 111-a second oil channel, 12-a positioning sleeve, 121-a third oil channel and 13-a return spring;
the bold solid arrows in fig. 2 represent the flow direction of the oil.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
As shown in fig. 1 to 6, a hydraulic variable valve timing mechanism includes a main camshaft 1 and a main camshaft gear 2 provided at one end of the main camshaft 1, the main camshaft 1 being provided with a main cam 3; main camshaft 1 is hollow structure and its inside coaxial arrangement has vice camshaft 4, and the one end of vice camshaft 4 is equipped with swing arm 5, and swing arm 5 is located same end with main camshaft gear 2, and the eccentric mounting has vice cam 6 on the vice camshaft 4, and vice cam 6 wears out the one end setting of main camshaft 1 periphery and being close to main cam 3.
The main camshaft gear 2 is provided with a base 7, the base 7 is provided with an engine oil inlet 71, the base 7 is internally provided with a push rod 8 in a sliding manner, one end of the push rod 8 extends out of the base 7 and is abutted against the swing arm 5, and the base 7 is internally provided with an elastic return element for returning the push rod 8.
Preferably, the hydraulic variable valve timing mechanism further includes:
the fixed seat 9, the fixed seat 9 is provided with a main oil gallery 91;
the adapter plate 10 is fixedly arranged on the main camshaft gear 2, and a first oil duct 101 communicated with an engine oil inlet 71 is arranged on the adapter plate 10;
It should be noted that the fixed seat 9 is a main oil gallery component of the engine; sealing elements are arranged between the fixed seat 9 and the piston 11 and between the adapter plate 10 and the base 7; in addition, the piston 11 and the adapter plate 10 may be replaced by other manners that can be implemented by those skilled in the art, as long as the engine oil in the main oil gallery 91 can be guided into the engine oil inlet 71, which is not described herein again.
In order to make the swing arm 5 move accurately, the swing arm 5 is provided with a sliding groove 51 matched with the extending end of the push rod 8, and the sliding groove 51 plays a role in restricting the movement of the extending end of the push rod 8.
In this embodiment, a positioning sleeve 12 for limiting the position of the push rod 8 is further disposed in the base 7, and a third oil passage 121 communicating with the engine oil inlet 71 is disposed on the positioning sleeve 12.
In order to make the structure of the elastic return element simple, the elastic return element is a return spring 13 sleeved on the push rod 8, one end of the return spring 13 is abutted against the base 7, and the other end of the return spring is abutted against the push rod 8. Of course, as an alternative, the elastic return element may also be a plurality of disc springs, etc., which are well known to those skilled in the art and will not be described herein.
The working principle is as follows:
the engine oil in the main oil duct 91 can enter the engine oil inlet 71 through the second oil duct 111 and the first oil duct 101, the engine oil entering the base 7 from the engine oil inlet 71 can act on the push rod 8 through the third oil duct 121, when the engine oil pressure is increased along with the engine rotation speed, the push rod 8 extends outwards under the action of the engine oil pressure to push the swing arm 5 to rotate, so that the auxiliary camshaft 4 generates a relative angle relative to the main camshaft 1, and after the auxiliary cam 6 rotates relative to the main cam 3 to complete the required angle, as shown in fig. 6, the angular speeds of the auxiliary camshaft 4 and the main camshaft 1 are kept synchronous, so that the valve opening time is advanced, and at the same time, the valve opening time is controlled by the main cam 3 and the auxiliary cam 6 at the same time, so that the valve timing is changed; when the engine load is reduced and the rotating speed is reduced, the oil pressure is reduced, the push rod 8 retracts under the action of the return spring 13, the swing arm 5 rotates reversely, and the auxiliary cam 6 returns to the original position, so that the relative angle difference between the main cam 3 and the auxiliary cam 6 is eliminated, and the valve opening time is controlled by the main camshaft 1 at the moment, as shown in figure 1.
The hydraulic variable valve timing mechanism provided by the embodiment of the invention is controlled by engine oil, an additional electric control mechanism is not needed, the structure is simple, and meanwhile, the electric control part is not needed to be subjected to insulation treatment, so that the reliability is improved; the comprehensive performance of the engine at high rotating speed is ensured, the economical efficiency, the dynamic property and the emission performance of the engine are improved, and the energy-saving and emission-reducing engine has positive effects on the aspects of energy conservation and emission reduction of the engine.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (3)
1. The hydraulic variable valve timing mechanism comprises a main camshaft and a main camshaft gear arranged at one end of the main camshaft, wherein a main cam is arranged on the main camshaft; the cam mechanism is characterized in that the main cam shaft is of a hollow structure, an auxiliary cam shaft is coaxially arranged in the main cam shaft, one end of the auxiliary cam shaft is provided with a swing arm, the swing arm and the main cam shaft are positioned at the same end, an auxiliary cam is eccentrically arranged on the auxiliary cam shaft, and the auxiliary cam penetrates through the periphery of the main cam shaft and is arranged close to one end of the main cam;
the main gear shaft gear is provided with a base, an engine oil inlet is formed in the base, a push rod is slidably mounted in the base, one end of the push rod extends out of the base and abuts against the swing arm, and an elastic return element for returning the push rod is further arranged in the base;
the swing arm is provided with a chute matched with the extending end of the push rod;
and a positioning sleeve for limiting the position of the push rod is further arranged in the base, and a third oil duct communicated with the engine oil inlet is arranged on the positioning sleeve.
2. The hydraulic variable valve timing mechanism according to claim 1, further comprising:
the fixing seat is provided with a main oil duct;
the adapter plate is fixedly arranged on the main camshaft gear, and a first oil duct communicated with the engine oil inlet is arranged on the adapter plate;
the piston is arranged between the fixed seat and the adapter disc, a second oil duct is arranged on the piston and is respectively communicated with the main oil duct and the first oil duct, and an end face seal is arranged between the piston and the adapter disc.
3. The hydraulic variable valve timing mechanism of claim 1, wherein the resilient return element is a return spring nested on the push rod, one end of the return spring abutting against the base and the other end abutting against the push rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710533740.5A CN107100691B (en) | 2017-07-03 | 2017-07-03 | Hydraulic variable valve timing mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710533740.5A CN107100691B (en) | 2017-07-03 | 2017-07-03 | Hydraulic variable valve timing mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107100691A CN107100691A (en) | 2017-08-29 |
| CN107100691B true CN107100691B (en) | 2023-03-24 |
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ID=59664520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710533740.5A Active CN107100691B (en) | 2017-07-03 | 2017-07-03 | Hydraulic variable valve timing mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107100691B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0714105U (en) * | 1993-08-06 | 1995-03-10 | 日産ディーゼル工業株式会社 | Valve drive for internal combustion engine |
| WO2012134812A2 (en) * | 2011-03-30 | 2012-10-04 | Borgwarner Inc. | Concentric camshaft phaser torsional drive mechanism |
| CN103775155B (en) * | 2012-10-25 | 2016-02-03 | 重庆长安汽车股份有限公司 | The oil circuit control of Variable Valve Time |
| CN105781652B (en) * | 2014-12-24 | 2018-06-26 | 上海汽车集团股份有限公司 | The variable valve timing system and its control method of valve duration phase continuous variable |
| CN204663604U (en) * | 2015-04-10 | 2015-09-23 | 上汽通用五菱汽车股份有限公司 | A kind of engine variable-valve timing controlling mechanism |
| CN206942827U (en) * | 2017-07-03 | 2018-01-30 | 潍柴西港新能源动力有限公司 | Fluid power VVT gear |
-
2017
- 2017-07-03 CN CN201710533740.5A patent/CN107100691B/en active Active
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| Publication number | Publication date |
|---|---|
| CN107100691A (en) | 2017-08-29 |
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