Air valve correct time-lift adjusting mechanism

[0027] Attached below Figure 1-8 A detailed description of the present invention:

[0028] See figure 1 The valve timing-lift adjustment mechanism of the present invention includes the following structures: valve (1), L-shaped bracket (2), swing arm (3), rack (4), return spring I (5) , Pin a (6), stepping motor I (7), gear (8), connecting device (9), guide rail (10), connecting plate (11), connecting rod (12), stepping motor II (13) , Swing arm (14), pin b (15), hockey rod (16), pin c (17), pin d (18), cam (19), return spring II (20), cylinder head (21) , Swing arm bracket (22).

[0029] See figure 1 , figure 2 , Figure 4 , Figure 7 , The shaft (901) of the connecting device (9) is connected with the shaft hole (201) provided on the L-shaped bracket (2), and is in clearance fit with it, so that the connecting device (9) can rotate relative to the bracket (2); the rack ( 4) The upper part is placed between the guide rail (10) and the gear (8), and the lower end is placed on the upper surface of the swing arm (3) and slidably connected to it; the left end of the return spring I (5) is fixed on the L-shaped bracket (2) , The right end is fixed to the lower part of the rack (4); one end of the pin a (6) is fixed to the left end of the connecting rod (12), and the other end penetrates into the oval hole (402) provided on the rack (4), and Clearance fit; under the combined action of the return spring I (5) and the connecting rod (12), the connecting device (9), stepping motor I (7), gear (8), guide rail (10) and rack (4) Synchronous rotation, while the rack (4) drives the swing arm (3) slidably connected to it to move.

[0030] See figure 1 , figure 2 , image 3 , Figure 7 , The stepping motor I (7) is installed on the rectangular platform (902) of the connecting device (9) by bolts; the gear (8) is fixed on the shaft of the stepping motor I (7) and is connected to the rack (4) The upper straight tooth (401) meshes, the function of the gear (8) is to connect and drive the rack (4) to move; the connecting device (9) is composed of a shaft (901) and a rectangular platform (902), the front of the rectangular platform (902) A threaded hole b (903) is provided, and a threaded hole c (904) is provided on the side. The threaded hole b (903) is connected with the fixing bolt of the stepping motor I (7), and the threaded hole c (904) is connected to the connecting plate (11) The guide rail (10) is a U-shaped guide rail, which is slidably connected with the upper half of the rack (4) to limit and guide the rack (4); the connecting plate (11) is connected with each other through bolts The rectangular platform (902) of the connecting device (9) and the guide rail (10) are fixedly connected; the connecting device (9), the guide rail (10) and the connecting plate (11) are connected together by bolts to carry the stepping motor I (7). ), gear (8) and rack (4); when the valve lift needs to be changed, the stepper motor I (7) drives the gear (8) to rotate, and the gear (8) drives the rack (4) on the guide rail ( 10) Medium telescopic, changing the downward distance of the swing arm (3) slidably connected with the rack (4), and then changing the downward distance of the valve (1), so as to realize the adjustment of the valve lift.

[0031] See figure 1 , Figure 4 , The L-shaped bracket (2) is fixedly connected to the cylinder head (21), and is provided with a shaft hole (201) and a threaded hole a (202); wherein the shaft hole (201) and the shaft (901) of the connecting device (9) The threaded hole a (202) is connected with the fixing bolt of the stepping motor II (13); the L-shaped bracket (2) is used to carry the connecting device (9) and the stepping motor II (13).

[0032] See figure 1 , Figure 5 , The swing arm bracket (22) is fixed to the cylinder head (21); the left end of the swing arm (3) is provided with an arc-shaped boss I (301), the upper surface is provided with an arc-shaped boss II (302), and the right end A circular hole a (303) is provided, in which the arc-shaped boss I (301) is suspended on the top of the valve (1); one end of the pin d (18) is fixedly connected to the upper part of the swing arm bracket (22), and the other end is placed on the swing arm support (22). In the round hole a (303) provided at the right end of the arm (3), it is in clearance fit with it.

[0033] See figure 1 , Image 6 , The upper part of the rack (4) is provided with straight teeth (401), the middle part is provided with an elliptical hole (402), and the lower end is provided with a round head (403), wherein the elliptical hole (402) has a radius smaller than the elliptical hole ( 402) The pin a(6) with half-short axis length, during the movement of the mechanism, the pin a(6) slides freely in the oval hole (402) to prevent the mechanism from jamming.

[0034] See figure 1 , Figure 8 , The hockey stick connecting rod (16) is provided with a circular hole b (1601) in the upper part, a circular hole c (1602) in the middle part, and an arc section (1603) at the lower part, wherein the arc section (1603) and the cam (19 ) Sliding connection to prevent the cam (19) from being locked during rotation; one end of the pin c (17) is fixed to the right end of the connecting rod (12), and the other end penetrates the circular hole c provided on the hockey stick connecting rod (16) The lower end of the return spring II (20) is fixed on the cylinder head (21), and the upper end is fixed on the lower end of the hockey stick connecting rod (16); the cam (19) drives the hockey stick connecting rod ( 16) Movement, thereby driving the movement of the entire mechanism.

[0035] Refer to figure 1 , The stepping motor II (13) is fixed to the L-shaped bracket (2) by bolts; the rotating arm (14) is fixed to the shaft of the stepping motor II (13); one end of the pin b (15) is fixed to the rotating shaft On the arm (14), the other end is connected with the round hole b (1601) provided on the hockey stick connecting rod (16), and is in clearance fit; when the valve timing needs to be changed, the stepping motor II (13) drives the arm (14) Rotate, the swing arm (14) moves the hockey stick link (16) up or down through the pin b(15), thereby changing the lower arc section (1603) of the hockey stick link (16) and the cam (19) ) At the moment when the protrusion contacts, under the transmission of the connecting rod (12), the moment when the lower end of the rack (4) contacts the arc-shaped boss II (302) on the upper surface of the swing arm (3) will also occur accordingly. Change, thereby changing the opening and closing time of the valve (1), and realize the adjustment of the valve timing.

[0036] Refer to figure 1 , Stepper motor I (7) has the same structure and principle as stepper motor II (13): a stepper motor can convert an electrical pulse signal into an angular displacement. When the stepper driver receives a pulse signal, it drives the stepper motor Rotate a fixed angle according to the set direction, and control the angular displacement by controlling the number of pulses. This adjustment method has high accuracy and high reliability. The stepper motor I (7) and stepper motor II (13) are coordinated and controlled by the ECU. Because the ECU stores the best valve timing and lift parameters under various operating conditions, the ECU will change with the operating conditions Control the action of stepper motor I (7) and stepper motor II (13), thereby changing valve timing and lift.

[0037] Combining the components of the device of the present invention and their installation positions, the functions and control principles that can be achieved by the valve timing-lift adjustment mechanism are as follows:

[0038] When the engine operating conditions are stable and the valve timing and lift do not need to be changed, the stepper motor I (7) and stepper motor II (13) do not operate, the rotating arm (14) is fixed at a certain position, and the cam (19) The hockey stick connecting rod (16) is driven to cyclically oscillate with the pin b(15) as the axis, and the pin c(17) moving together with the hockey stick connecting rod (16) drives the connecting rod (12) to move, and the connecting rod ( 12) The pin a(6) that moves together drives the rack (4), gear (8), guide rail (10) and the connecting device (9) to rotate synchronously around the shaft (901). At the same time, the lower end of the rack (4) The swing arm (3) is driven to swing with a certain amplitude, so that the valve (1) is opened and closed on time and the downward distance is fixed.

[0039] When the engine operating conditions change and the valve timing and lift need to be changed, the stepper motor I (7) and stepper motor II (13) act under the control of ECU, and the shaft of the stepper motor I (7) drives the gear (8) ) Rotate a certain angle, the gear (8) drives the rack (4) to expand and contract a certain distance in the guide rail (10), so that the lower end of the rack (4) and the arc-shaped boss II on the upper surface of the swing arm (3) The relative position of 302) is changed to change the downward moving distance of the swing arm (3), and then the downward distance of the valve (1) to realize the adjustment of the valve lift; the rotating shaft of the stepping motor II (13) drives the rotating arm (14) ) Rotate a certain angle, the pivoting arm (14) moves the hockey stick connecting rod (16) up or down a certain distance through the pin b (15), thereby changing the lower arc section (1603) of the hockey stick connecting rod (16) and The contact moment of the convex cam (19), under the transmission of the connecting rod (12), the contact moment between the lower end of the rack (4) and the arc-shaped boss II (302) on the upper surface of the swing arm (3) also occurs. Corresponding changes are made to change the time when the swing arm (3) moves downward and the time when the valve (1) is opened and closed to realize the adjustment of the valve timing.