CN2448928Y

CN2448928Y - Mechanism capable changing valve timing phase and valve lift

Info

Publication number: CN2448928Y
Application number: CN98244501U
Authority: CN
Inventors: 吴江
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-09-25
Filing date: 1998-09-25
Publication date: 2001-09-19
Anticipated expiration: 2008-09-25

Abstract

The utility model relates to a mechanism capable of changing the valve timing phase and valve lift of an internal-combustion engine simultaneously, which is formed by matching a deforming cam body (1) and a tappet assembly, wherein the deforming cam body (1) is a group of series bodies provided with cams in similar geometric shapes; the tappet assembly is composed of a square abrasion-proof block (2) and a semi-cylindrical rod body (3). The deforming cam body (1) is arranged on a cam shaft (5). When the internal-combustion engine runs, an electric control system enables the cam shaft to move to change the matched position of the deforming cam body (1) with the tappet, so that the opening and closing time and the lift of the valve connected with the tappet can be changed simultaneously, and thus the changes of the valve timing phase and valve lift are realized.

Description

Variable valve timing and air valve lift range mechanism

A kind of variable valve timing and air valve lift range mechanism belong to four-stroke internal combustion engine distribution mechanism.

Common four-stroke internal combustion engine distribution phase place and air valve lift range mechanism have three types usually, generally realize by matching by helical spline between Timing Belt wheel and the camshaft, but helical spline can only be realized port timing and changes.Another kind of is to install two groups to have the different valve timings and the cam of valve lift on a camshaft, and the cooperation by to each group (high-speed type group and low speed type group) cam realizes the change of port timing and valve lift.Also have and to carry out with rocker arm body that variable gas distribution and valve lift change.But when running up, it is the discontinuous grade saltus step that has that valve lift and distribution change to the internal-combustion engine of above-mentioned two kinds of mechanisms, changes not steady by low speed.

The purpose of this utility model is in order to overcome the deficiencies in the prior art, and a kind of mechanism that not only can change port timing but also can change valve lift simultaneously is provided, and internal-combustion engine is worked under any operating mode can be continuously, running stably.

For achieving the above object, variable valve timing of the present utility model and air valve lift range mechanism employing are matched with tappet rod complement by the distortion cam body and form.Between distortion cam body and the tappet, the square body wear-resistant block that is connected through the hinge in the tappet upper end, the body of rod of tappet is half Cylinder, its lower end connects valve.The distortion cam body be installed in can axially movable camshaft on.The distortion cam body is by one group of corresponding different valve timings and valve lift and have the cam polyphone body that corresponding geometric cam is connected in series under various operating modes; It is all operating modes by internal-combustion engine, comprises low temperature low speed starting cold or hot exposure, and low speed is zero load (idling operation), and middling speed is zero load (fast-idle speed operating mode), to the little load of middling speed, contacts to the rule of loading greatly at a high speed again.When the internal-combustion engine starting cold, the information that senses simultaneously by throttle position sensor and temperature transducer, send the instruction of starting cold via automatical control system, control electromagnetism winding produces different magnetic force, camshaft is carried out moved axially, thereby allow the wear-resistant block of tappet upper end slide into the cam of cooperation with it for starting best cam position.After the starting, in operation process, along with internal-combustion engine is under the different operating modes, the sensing device of throttle sensor, temperature transducer and some other reflection working order, as speed probe, air inflow sensor, air inlet oxygen content sensor etc., send the various parameters of internal combustion engine situation to control system, again by executive components such as electric control system control electromagnetism winding and hydrovalves, under magnetic force and hydraulic piston act on simultaneously, camshaft is produced move axially to the corresponding relative cam position of operating mode at that time, realize best valve timing.The square body wear-resistant block of tappet upper end profile face outside the distortion cam body is made sliding linearly, thereby the drive tappet moves up and down the lift motion that the while tappet makes the valve that is attached thereto do unlatching, cut out again.The unlatching of valve, shut-in time and lift amount are by the contact position decision on square body wear-resistant block and the outer profile face of cam body.Internal-combustion engine is from starting to big load operation, and in this change procedure, the position of distortion cam body is all constantly changing along with moving of camshaft, thereby realizes that internal-combustion engine when any operating mode changes, can both obtain best port timing and valve lift.

After adopting this mechanism, compared with prior art, internal-combustion engine not only can change port timing under all operating modes, also can change valve lift simultaneously.Its mechanism mainly is made up of distortion cam body and tappet rod complement, and simple in structure, technology is simple for production, does not need more parts, installs easily.The control output signal is single, only is the axial displacement signal of camshaft.The change of variable valve timing and valve lift continuously, be linear change, thereby make the operation process of internal-combustion engine steady, excessively slick and sly.And this mechanism can be fit to various valves and use, and can control many valves.Implement internal-combustion engine of the present utility model, it had both had the high-power of high power type internal-combustion engine, also had advantages such as the low-speed torque characteristic of practical internal-combustion engine and idling are stable.The utility model variable valve timing and air valve lift range mechanism can improve the working efficiency of internal-combustion engine, reach the fuel saving oil consumption, increase the effect of economic benefit.

Below in conjunction with accompanying drawing, specific embodiments of the present utility model is further described.

Fig. 1 is a plan view of the present utility model;

Fig. 2 is a side-looking working drawing of the present utility model;

Fig. 3 is the schematic representation of an embodiment.

With reference to Fig. 1, the utility model is a kind of variable valve timing and air valve lift range mechanism, and it is cooperated by distortion cam body (1) and tappet rod complement and forms.Distortion cam body (1) is a cam polyphone body that is connected in series by one group of cam with similar geometry figure, and distortion cam body (1) is installed on the camshaft (5), can move axially.Camshaft (5) links to each other with displacement mechanism.Between tappet rod complement and the distortion cam body (1),, connect a square body wear-resistant block (2) and make the wear-resistant block (2) and the outer profile face of distortion cam body (1) do sliding contact by hinge (4) in the tappet upper end.The tappet body of rod (3) is the semicircle cylindrical body, when the body of rod is moved up and down, does not rotate.The lower end of the body of rod (3) connects valve.The size e of the shaft axis of hinge (4) and wear-resistant block (2) upper-end surface is as much as possible little, and is then also just less to the reduction value of cam profile shape; The concave surface of the upper end crowning of the tappet body of rod (3) and wear-resistant block (2) is the center with hinge (4), and the semi-circumference of doing the center of circle is slidingly matched, thereby has improved the working environment of hinge.

With reference to Fig. 2, the working condition of variable valve timing and air valve lift range mechanism is described.The unlatching of valve when idling for internal combustion engine turns round, pass close point are a point, c point, and valve idling lift peak is f; When internal-combustion engine rotational speed is more and more higher, the unlatching of valve, to close close point close to b point, d point respectively by a point, c point, the valve lift peak is also close to high speed valve lift peak g point by the f point simultaneously, has formed lift amount h, thereby has realized the change of port timing and the change of valve lift.

Fig. 3 is the most preferred embodiment of an embodiment.Distortion cam body (1) is a port timing under the different operating modes of correspondence has different geometric figure curved surfaces with valve lift a complete processome.Also distortion cam body (1) and camshaft (5) can be connected as a single entity, form an one-piece element.Easier composition variable valve timing and air valve lift range mechanism.

Claims

1, a kind of variable valve timing and air valve lift range mechanism, cooperate with tappet rod complement and form by distortion cam body (1), it is characterized in that, distortion cam body (1) is by one group of corresponding different valve timings and valve lift and have a similar curves profile the heart is moved the polyphone body that disc cam is connected in series under various operating modes, between distortion cam body (1) and the tappet, connect a square body wear-resistant block (2) in the tappet upper end, the other end of the body of rod (3) connects valve.

2, variable valve timing according to claim 1 and air valve lift range mechanism is characterized in that, the tappet body of rod (3) that matches with distortion cam body (1) is half round cylinder.

3, variable valve timing according to claim 1 and air valve lift range mechanism is characterized in that, the square body wear-resistant block (2) of doing sliding contact with the distortion cam body is connected with tappet with hinge (4).