CN100562647C

CN100562647C - A kind of continuous variable valve opens the timing camshaft of duration and valve opening advance angle

Info

Publication number: CN100562647C
Application number: CNB2007100361118A
Authority: CN
Inventors: 张志强
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-11-10
Filing date: 2007-11-10
Publication date: 2009-11-25
Anticipated expiration: 2027-11-10
Also published as: CN101173618A

Abstract

The invention discloses the timing camshaft that a kind of continuous variable valve opens duration and valve opening advance angle, its structure comprises and is subjected to valve to open the central shaft and the rotating cam backhaul guide rail of duration controller control, is subjected to the hollow shaft and the cam of valve opening advance angle phase controller control; Hollow shaft sleeve is on central shaft, and cam is fastened on the hollow shaft, and the class fan groove that communicates with axial bore in the hollow shaft is arranged on the cam; Rotating cam backhaul guide rail embeds in the class fan groove of cam, certain rotation space is arranged in the class fan groove, and fixedly connected with central shaft; The external frame of rotating cam backhaul guide rail and the external frame of cam are concyclic, and its minimum profile is mutually circumscribed with the basic circle of cam.The present invention can significantly improve distribution usefulness on the basis of variable cam phase place motor, significantly improve the power character and the Economy of motor.

Description

A kind of continuous variable valve opens the timing camshaft of duration and valve opening advance angle

Technical field

The present invention relates to a kind of camshaft, particularly a kind of continuous variable valve opens the timing camshaft of duration and advance angle.

Background technique

Along with people to the improving constantly of the requirements such as performance oil consumption discharging of motor car engine, international each big automobile group all drops into a large amount of fund manpower research and development changeable air valve technology.Because the adjusting amount of being of petrol engine is regulated, consider the factors such as kinetic characteristic of inertial flow, intake duct shape, compression ratio, combustion-chamber shape, combustion case and the camshaft valve mechanism of intake and exhaust, motor is at different rotating speeds, under the situation of load and engine temperature, for realizing best power character, Economy has very complicated requirement to the ventilation situation.Practical at present technology just cooperates the rotating speed of motor and the variation change camshaft of load and the relative rotation of bent axle to make the valve opening advance angle increase or reduce or change valve lift etc. by some mechanism, thereby improve the power performance of motor under various rotating speeds and load to a certain extent, reduce discharging simultaneously and improve Economy.Deficiency: the variable cam axis mechanism can be realized valve opening advance angle phase adjusted, but valve opens that the duration can not change or can not can change continuously and (removes the VALVETRONIC technology of BMW, but just fine setting), so variable cam distribution device in the past can not fully satisfy the distribution demand of motor reality.Be called valve the period between valve opening and the valve-closing and open the duration, these three values are determined wherein any two can draw the 3rd value, open under the unalterable situation of duration at valve, if engine low rotation speed low load operation, the valve opening advance angle is less, but the retarded closing of valve angle is bigger, bigger retarded closing of valve angle can make the charge of suction push back intake duct again and cause very big charge loss, if high engine speeds high loaded process, the valve opening advance angle is bigger, but retarded closing of valve angle less (than low speed time much smaller), less retarded closing of valve angle can make valve close too early, have very high-speed fresh air and be blocked in outside the cylinder, cause very big charge loss equally.Valve open the duration can not the situation of continuous control under, VTEC technology with Honda is an example, each cylinder has three cams to drive valve swing arm assembly respectively under the high rotating speed in low, thereby has only three discontinuous valves to open the duration, can't satisfy the distribution demand under the full operating mode.

Summary of the invention

The object of the invention provides a kind of continuous variable valve and opens duration and valve opening advance angle, can significantly improve the timing camshaft of engines distribution usefulness.

Technological scheme of the present invention: a kind of continuous variable valve opens the timing camshaft of duration and valve opening advance angle, its structure comprises and is subjected to valve to open the central shaft and the rotating cam backhaul guide rail of duration controller control, is subjected to the hollow shaft and the cam of valve opening advance angle phase controller control; Hollow shaft sleeve is on central shaft, and cam is fastened on the hollow shaft, and the class fan groove (28) that communicates with axial bore in the hollow shaft is arranged on the cam; Rotating cam backhaul guide rail embeds in the class fan groove of cam, certain rotation space is arranged in the class fan groove, and fixedly connected with central shaft; The external frame of rotating cam backhaul guide rail and the external frame of cam are concyclic, and its minimum profile is mutually circumscribed with the basic circle of cam; Described valve opening advance angle phase controller comprises that sprocket wheel, oil distribution casing, valve opening shift to an earlier date chamber and valve opening retard chamber, big annular pressure oil duct and little annular pressure oil duct are arranged between sprocket wheel and the oil distribution casing, and little annular pressure oil duct is connected with first annular oil groove in valve opening shifts to an earlier date the chamber and first sliding bearing respectively; Big annular pressure oil duct is connected with second annular oil groove in the valve opening retard chamber and first sliding bearing respectively; Described valve opens the duration controller and comprises that valve opens the duration and prolongs chamber and valve and open the duration and shorten the chamber, valve opens the duration and prolongs the chamber and be connected with Fourth Ring shape oil groove in second sliding bearing, and valve opens the duration to be shortened the 3rd interior annular oil groove of chamber and second sliding bearing and be connected.

Described hollow shaft is connected in series by at least two sections and forms, and is distributed with at least two cams and at least two sliding bearings on the hollow shaft.

Technique effect of the present invention: because this camshaft is a fabricated structure, rotating cam backhaul guide rail can rotating certain angle in fan groove.Rotating cam backhaul guide rail drives the angle that turns left by central shaft, and then valve opens the duration and can prolong double angle, otherwise then shortens double angle.The valve opening duration can prolong 45 degree above (distribution shows mutually), and with the control of valve opening advance angle be separate.Because valve opening advance angle and valve open the duration and can control respectively, can realize that motor is under the situation of slow-speed of revolution low load operation, the valve opening advance angle is less, the retarded closing of valve angle is also less simultaneously, and controlled less retarded closing of valve angle can make intake valve close and improve charge to the full extent on appropriate opportunity (intake velocity is) at 0 o'clock.Motor is under the situation of high speed high loaded process, and the valve opening advance angle is bigger, and the retarded closing of valve angle is also bigger simultaneously, can at utmost utilize the inertia of air inlet to increase charge.So the present invention can significantly improve distribution usefulness on the basis of variable cam phase place motor, significantly improve the power character and the Economy of motor.

Description of drawings

The present invention is further described below in conjunction with drawings and Examples.

Fig. 1 is embodiments of the invention figure;

Fig. 2 is the structural representation of hollow shaft and cam;

Fig. 3 is the C-C sectional view of valve opening advance angle phase controller among Fig. 1;

Fig. 4 is the B-B sectional view of valve opening duration controller among Fig. 1;

Fig. 5 is the A-A sectional view among Fig. 1;

Fig. 6 is the sectional view of rotating cam backhaul guide rail when embedding in the class fan groove;

Fig. 7 is the structural representation of rotating cam backhaul guide rail;

Fig. 8 is the sectional view of rotating cam backhaul guide rail;

Fig. 9 is the structural representation of central shaft;

Figure 10 is the sectional view at central shaft tangent plane place;

Figure 11 is the lock pin structural representation.

Specific embodiment

Extremely shown in Figure 10 as Fig. 1, a kind of continuous variable valve opens the timing camshaft of duration and advance angle, its structure comprises central shaft 1, hollow shaft 2, cam 3 and rotating cam backhaul guide rail 4, hollow shaft 2 is enclosed within on the central shaft 1 and can relatively rotates, cam 3 is welded on the hollow shaft 2 or with cam 3 and hollow shaft 2 and does as a whole processing, and the class fan groove 28 that communicates with axial bore 65 in the hollow shaft 2 is arranged on the cam 3; Rotating cam backhaul guide rail 4 embeds in the class fan groove 28 of cam 3, and certain rotation space 64 is arranged in class fan groove 28, and the maximum rotation angle in this space is about 25 degree; Rectangle tangent plane 31 is arranged on the central shaft 1, in the time of in the class fan groove 28 of rotating cam backhaul guide rail 4 embedding cams 3, the bottom surface 67 of guide rail 4 contacts with central shaft tangent plane 31 just, screw passes hole 29 on the hollow shaft 2 and the hole on the central shaft 1 30 and screws in the tapped hole 66 on the rotating cam backhaul guide rails 4, thereby rotating cam backhaul guide rail 4 is fixedlyed connected with central shaft 1; The external frame 32 of rotating cam backhaul guide rail 4 is concyclic with the external frame 25 of cam 3, and its minimum profile 33 is mutually circumscribed with the basic circle of cam 3.Hollow shaft 2 is made up of the multistage hollow shaft that is welded to each other series connection, between weld between adjacent two sections hollow shafts and the central shaft 1 space 9 is arranged, and guarantees that the welding thing does not contact with central shaft 1.Hollow shaft 2 is controlled by valve opening advance angle phase controller, and a plurality of sliding bearings 41 and a plurality of cam 3 that is the different amount arrangement are arranged on the hollow shaft 2.First annular oil groove 12 and second annular oil groove 13 are arranged in first sliding bearing 42 of hollow shaft 2 left ends, in second sliding bearing 52 of right-hand member the 3rd annular oil groove 14 and Fourth Ring shape oil groove 15 are arranged.The left end of hollow shaft 2 has two axial

pressure oil ducts

8,10, and valve opening advance angle phase controller comprises that end cap 24, stator 22, rotor 23, sprocket wheel 5, oil distribution casing 7, bolt 60, valve opening shift to an earlier date chamber 20 and valve opening retard chamber 21.Pressure oil duct 8 respectively with valve opening advance angle phase controller in three valve opening retard chamber 21 and second annular oil groove 13 in first sliding bearing 42 be connected, pressure oil duct 10 is connected with first annular oil groove 12 that shifts to an earlier date in the chamber 20 and first sliding bearing 42 of three valve openings in the valve opening advance angle phase controller respectively; The big annular pressure oil duct 27 that is communicated with valve opening retard chamber 21 is arranged between sprocket wheel 5 and the oil distribution casing 7 and shift to an earlier date the little annular pressure oil duct 26 that chamber 20 is communicated with valve opening, little annular pressure oil duct 26 is connected with first annular oil groove 12 in first sliding bearing 42 by radial pressure oil duct 54 and axial pressure oil duct 10, and big annular pressure oil duct 27 is connected by the second interior annular oil groove 13 of radial pressure oil duct 53 and axial pressure oil duct 8 and first sliding bearing 42.Central shaft 1 is subjected to valve to open the duration controller to control, and valve opens the duration controller and comprises that left end cap 16, rotor 51, stator 50, right end cap 19, bolt 61, valve open the duration and prolong chamber 17 and valve and open the duration and shorten chamber 18; The right-hand member of central shaft 1 has axial pressure oil duct 11, is communicated with the 3rd annular oil groove 14 in second sliding bearing 52 by radial pressure oil duct 55, opens duration shortening chamber 18 by radial pressure oil duct 63 and valve and is communicated with; Axial pressure oil duct 40 is arranged on the left end cap 16, the right-hand member of hollow shaft 2 has axial pressure oil duct 43 and radial pressure oil duct 44, and valve opens the duration and prolongs chamber 17 and be communicated with by the interior Fourth Ring shape oil groove 15 of axial pressure oil duct 43, radial pressure oil duct 44 and second sliding bearing 52.

The realization of valve opening advance angle control: the oil hydraulic pump of motor is imported valve opening advance angle control three position four-way electromagnetic valve A with pressure oil, and two oil transportation mouths of solenoid valve A connect two annular oil grooves in first sliding bearing 42 respectively.When needing the valve opening advance angle to increase, the computer system control electromagnetic valve A of motor is to first annular oil groove, 12 incoming pressure oil, pressure oil is by axial pressure oil duct 10, radial pressure oil duct 54, little annular pressure oil duct 26 and hole 6 enter three valve openings and shift to an earlier date chamber 20, rotate counterclockwise with respect to stator 22 at the effect lower rotor part 23 of oil pressure, and rotor 23 is connected with hollow shaft 2, then hollow shaft 2 rotates counterclockwise with respect to sprocket wheel 5, realizes that the valve opening advance angle increases.Hydraulic oil in the rotor 23 left side valve opening retard chamber 21 passes through hole 62 under the promotion of rotor 23 simultaneously, big annular pressure oil duct 27, and radial pressure oil duct 53, axial pressure oil duct 8, the second annular oil grooves 13, solenoid valve A flows back to the machine oil chamber of motor.When needing the valve opening advance angle to reduce, solenoid valve A imports second annular oil groove, 13 pressure oils along with the upper pathway reverse flow with pressure oil, promotes rotor 23 and clockwise rotates with respect to stator 22, realizes that just the valve opening advance angle reduces.When engine stoping operation, torque spring goes back to enable position (being the position that valve opening shifts to an earlier date the chamber minimum) with rotor 23, lock pin 70 inserts in the locking hole of end cap 24, guarantee motor camshaft stable when starting, motor pressure oil after startup can push back lock pin in the locking pin-and-hole, removes locking.

Valve opens the realization of duration control: the oil hydraulic pump of motor is imported valve with pressure oil and is opened duration control three position four-way electromagnetic valve B, two oil transportation mouths of solenoid valve B connect two annular oil grooves of second sliding bearing 52 respectively, need valve to open the duration overtime, the computer system control electromagnetic valve B of motor is to Fourth Ring shape oil groove 15 incoming pressure oil, pressure oil is by radial pressure oil duct 44, axial pressure oil duct 43, axial pressure oil duct 40, entering valve opens the duration and prolongs chamber 17, effect lower rotor part 51 at oil pressure clockwise rotates the counter-rotation that promptly turns to camshaft, rotating cam backhaul guide rail 4 is fixedlyed connected with central shaft 1, central shaft 1 and rotor 51 are connected by spline, rotor 51 just can drive 4 rotations of rotating cam backhaul guide rail like this, because reduce the external frame overlap region of cam 3 and rotating cam backhaul guide rail 4, the external frame length of cam prolongs, roller tappet prolonged in the endurance that far stops journey point, and its duration that opens of valve that is promoted by roller tappet just prolongs like this.Simultaneously rotor 51 right side valves open the duration shorten hydraulic oil in the chamber 18 under the promotion of rotor 51 through radial direction oil 63, axial pressure oil duct 11, radial direction oil 55, the three annular oil grooves 14, solenoid valve B flows back to the machine oil chamber of motor.Need valve to open the duration when shortening, the computer system control electromagnetic valve B of motor is to the 3rd annular oil groove 14 incoming pressure oil, the pressure oil edge is with the upper pathway reverse flow, promoting rotor 51 rotates counterclockwise, rotating cam backhaul guide rail 4 increases with the external frame overlap region of cam 3, the external frame shorten length of cam, valve open the duration just to be shortened.

Claims

1. a continuous variable valve opens the timing camshaft of duration and valve opening advance angle, it is characterized in that: its structure comprises and is subjected to valve to open central shaft (1) and the rotating cam backhaul guide rail (4) of duration controller control, the hollow shaft (2) and the cam (3) that controlled by valve opening advance angle phase controller; Hollow shaft (2) is enclosed within on the central shaft (1), and cam (3) is fastened on the hollow shaft (2), have on the cam (3) with hollow shaft (2) in the class fan groove (28) that communicates of axial bore (65); Rotating cam backhaul guide rail (4) embeds in the class fan groove (28) of cam (3), certain rotation space (64) is arranged in class fan groove (28), and fixedly connected with central shaft (1); The external frame (32) of rotating cam backhaul guide rail (4) is concyclic with the external frame (25) of cam (3), and its minimum profile (33) is mutually circumscribed with the basic circle of cam (3); Described valve opening advance angle phase controller comprises that sprocket wheel (5), oil distribution casing (7), valve opening shift to an earlier date chamber (20) and valve opening retard chamber (21), big annular pressure oil duct (27) and little annular pressure oil duct (26) are arranged between sprocket wheel (5) and the oil distribution casing (7), and little annular pressure oil duct (26) is connected with first annular oil groove (12) in valve opening shifts to an earlier date chamber (20) and first sliding bearing (42) respectively; Big annular pressure oil duct (27) is connected with interior second annular oil groove (13) of valve opening retard chamber (21) and first sliding bearing (42) respectively; Described valve opens the duration controller and comprises that valve opens the duration and prolongs chamber (17) and valve and open duration shortening chamber (18), valve opens the duration and prolongs chamber (17) and be connected with Fourth Ring shape oil groove (15) in second sliding bearing (52), and valve opens the duration to be shortened interior the 3rd annular oil groove (14) of chamber (18) and second sliding bearing (52) and be connected.

2, camshaft according to claim 1 is characterized in that: described hollow shaft (2) is connected in series by at least two sections and forms, and is distributed with at least two cams (3) and at least two sliding bearings (41) on the hollow shaft (2).