CN211287825U - A variable valve train - Google Patents

Abstract

The main components included in the utility model are: camshaft (12), rocker arm a (15) and rocker arm b (17), rocker arm shaft (8) and valve (16), pin (20) and inclined groove (801) ), displacement sleeve (21), motor (5) and associated motor shaft (4) and threaded rod (3). The motor shaft is controlled by the motor to drive the threaded rod to move axially, thereby driving the displacement sleeve to move on the rocker arm, changing the swing law of the rocker arm b(17), and then changing the lift of the valve.

Description

A variable valve train

technical field

The utility model relates to a variable valve mechanism, in more detail, the present invention is a method of using a motor to control a threaded rod to drive a displacement sleeve on a rocker arm to move to change the position of a "fulcrum" and the length of a "lever" between the two rocker arms, so as to achieve A mechanism in which the valve lift is continuously variable.

technical background

With the development of engine technology, the flexibility and controllability of engine parameters has become more and more important, and the flexibility and controllability of engine components provides a technical basis for engine intelligence. At the same time, the variable valve of the engine provides greater potential for the optimization of engine combustion mode and gas distribution. The valve lift and opening and closing timing of traditional engines remain unchanged, which makes the engine poor air intake in some working conditions, resulting in poor oil and gas mixing, or large intake negative power, resulting in poor engine economy and emissions. The variable valve technology can better optimize the valve opening, closing time and opening lift, improve the engine charging efficiency, reduce the fuel consumption rate, and then improve its thermal efficiency and improve its emission performance.

Utility model content

Invention to solve problem

The purpose of the utility model is to provide a motor-driven variable valve device, which can realize the continuous variable lift of the engine valve, meet the gas distribution requirements of the engine under different working conditions, improve the charging efficiency of the engine, and improve the economical efficiency and emission performance of the engine. The variable valve drive system replaces the variable valve mechanism with variable valve lift, which can only meet the high-efficiency charging efficiency of partial load.

In order to solve the above-mentioned technical problems, according to one aspect of the present utility model, the utility model provides the following technical solutions:

A variable valve mechanism consists of a stopper a, a bolt, a threaded rod, a motor shaft, a motor, a support a, a limit boss a, a rocker arm shaft, a cover plate a, a limit boss b, and a limit boss c. Camshaft, cover plate b, limit boss d, rocker arm a, valve, rocker arm b, cam, stopper b, pin, displacement sleeve, support b, support c, and the displacement sleeve is composed of a thread Set on the threaded rod, the block a and the block b are fixed on the threaded rod by bolts; one end of the motor shaft is connected with the motor, and the other end is fixed with the threaded rod; the motor is installed on the support a by bolts; the limit boss a and the limit boss b are fixed on the outer surface of the rocker shaft, the cover plate a and the support c are placed between the limit boss a and the limit boss b, and are connected by bolts; the rocker shaft is placed on the cover There is a clearance fit between the plate a and the support c; the limit boss c and the limit boss d are fixed on the outer surface of the camshaft, and the cover plate b and the support b are placed on the limit boss c and the limit boss d, and are also connected by bolts; the camshaft is placed between the cover plate b and the support b, with clearance fit; one end of the rocker arm a is sleeved on the outer surface of the rocker arm shaft, and is fixedly connected, and the other end is suspended on the valve The top end; the cam is fixed on the outer surface of the camshaft; one end of the rocker arm b is sleeved on the outer surface of the rocker arm shaft, and the other end is placed at the lower end of the cam; the pin is placed in the pin mounting hole provided by the rocker arm b, and is opened through the rocker arm shaft The chute, the pin has an interference fit with the pin mounting hole, and a clearance fit with the chute.

Preferably, the rocker arm a is provided with a circular hole, the rocker arm b is provided with a circular hole e and a pin mounting hole, the circular hole and the circular hole e are respectively connected with the rocker arm shaft, and the circular hole is fixedly connected with the rocker arm shaft, The round hole e is slidably connected with the rocker shaft.

Preferably, the rocker arm shaft is provided with an oblique groove, the block a is provided with a circular hole a and a circular hole c, and four bolts pass through circular holes b around the circular hole a; the block b A round hole f and a round hole h are provided, and four bolts pass through the round hole g around the round hole f; the round hole c and the round hole h are respectively arranged on both sides of the rocker arm b, and are slidably connected with the rocker arm shaft .

Preferably, a threaded through hole is provided at the center of the displacement sleeve shaft, a ring platform is provided in the center portion, and four fixing bolt holes are further provided around the ring platform.

Utility model effect

The utility model adopts the motor to control the rocker arm movement to change the rocker arm swing law, and realizes the change of the valve lift. It can improve the intake and exhaust conditions, improve the charging efficiency, improve the fuel utilization rate, and reduce the emission. In addition, the present invention has the advantages of simple structure and low manufacturing difficulty, and can reduce the production cost.

Description of drawings

Accompanying drawing 1 is the top view of this device;

Accompanying drawing 2 is the front view of this device;

Accompanying drawing 3 is the front view of rocker arm shaft (8);

Accompanying drawing 4 is the sectional view of the A-A section of the rocker shaft (8);

5 is a sectional view of the B-B section of the rocker shaft (8);

6 is a sectional view of the C-C section of the rocker shaft (8);

Accompanying drawing 7 is the schematic diagram of stopper a (1);

Figure 8 is a schematic view of the stopper b (19);

Accompanying drawing 9 is the schematic diagram of rocker arm a (15);

Figure 10 is a schematic view of the rocker arm b (17);

Figure 11 is a front view of the displacement sleeve (21);

Figure 12 is a side view of the displacement sleeve (22).

Detailed ways

Referring to the accompanying drawings, the embodiments of the present invention will be described, and the embodiments of the present invention will be described in detail with reference to the accompanying drawings 1-11.

The main components included in the utility model are: camshaft (12), rocker arm a (15) and rocker arm b (17), rocker arm shaft (8) and valve (16), pin (20) and inclined groove (801) ), displacement sleeve (21), motor (5) and associated motor shaft (4) and threaded rod (3). The motor shaft is controlled by the motor to drive the threaded rod to move axially, thereby driving the displacement sleeve to move on the rocker arm, changing the swing law of the rocker arm b(17), and then changing the lift of the valve.

The camshaft (12) of the utility model is placed between the cover plate b (13) and the support b (22), and is in clearance fit; the cover plate b (13) and the support b (22) are placed on the limiting convex The platform c (22) and the limit boss d (14) are connected by bolts, and the limit boss c (22) and the limit boss d (14) are fixed on the outer surface of the camshaft (12). When the camshaft (12) works, the rocker arm b (17) is driven by the rotation of the engine.

The rocker shaft (8) of the utility model is placed between the cover plate a (9) and the support c (23), and is in clearance fit; the cover plate a (9) and the support c (23) are placed at the limit The boss a (7) and the limit boss b (10) are connected by bolts, and the limit boss a (7) and the limit boss b (10) are fixed outside the rocker arm shaft (8). surface; the rocker shaft (8) is provided with a chute (801). Through the axial movement of the motor shaft (4) to control the moving distance of the pin (20) in the chute (801), the control of the rocker arm b (17) is realized, and the position of the "fulcrum" between the two rocker arms and the total The length of the "lever".

The rocker arm b (17) of the present invention is provided with a circular hole e (1701) and a pin mounting hole (1702); one end of the rocker arm b (17) is sleeved outside the rocker arm shaft (8) through the circular hole e (1701). On the surface, the circular hole e (1701) is slidably connected to the rocker arm shaft (8), the other end is placed at the lower end of the cam (18), and the rocker arm b (17) can move axially along the rocker arm shaft.

The rocker arm a (15) of the present invention is provided with a circular hole (1501), one end of the rocker arm a (15) is sleeved on the outer surface of the rocker arm shaft (8) through the circular hole (1501), and is fixedly connected, and the other end is suspended Put it on the top of the valve (16) and use it to open the valve.

The motor (5) of the present invention is mounted on the support a (6) through bolts, one end of the motor shaft (4) is connected to the motor (5), and one end is fixedly connected to the threaded rod (3); the displacement sleeve of the present invention (21) is sleeved on the threaded rod (3) through a thread. The motor (5) receives the ECU signal and controls the motor shaft (4) to move axially for a certain distance, the motor shaft (4) drives the threaded rod (3) to move, and the threaded rod (3) pushes the displacement sleeve (21) to move to realize the displacement sleeve (21) Quantitative movement along the axial direction.

The block a (1) of the present invention is provided with a circular hole a (101) and a circular hole c (103), and four bolts pass through the circular hole b (102) around the circular hole a (101); The block b (19) is provided with a circular hole f (1901) and a circular hole h (1903), and four bolts pass through the circular hole g (1902) around the circular hole f (1901). (1) and the stopper b (19) are fixed on the displacement sleeve (21) through the bolt (2); the circular hole c (103) and the circular hole h (1903) are respectively arranged on both sides of the rocker arm b (17), It is slidably connected with the rocker shaft (8). The stopper a (1) and the stopper b (19) constrain the axial movement of the rocker arm b (17), and transmit the motion state of the displacement sleeve (20) to the rocker arm b (17).

The pin (20) of the utility model is in interference fit with the pin installation hole (1702), and is in clearance fit with the inclined groove (801). The rocker arm b (17) is fixed on the pin (20), and the pin (20) slides in the chute (801). When the stopper is driven by the displacement sleeve to slide on the rocker arm shaft, the pin (20) moves in the inclined groove, and the rocker arm (17) fixedly connected with the pin (20) moves linearly in the axial direction.

The engine can adjust the engine valve lift according to the operating conditions to make the engine charging efficiency reach a better state, which can be realized by using the above-mentioned control device. The rocker arm b (17) is driven to swing, the rocker arm (17) is sleeved outside the rocker arm shaft (8), and the rocker arm shaft (8) drives the rocker arm a (15) that is fixed to it to swing, and the rocker arm a (15) swings. ) drives the valve (16) to realize the engine air distribution.

When the valve lift needs to be changed, referring to Figure 1, the motor (5) works, the motor shaft (4) moves horizontally, and drives the threaded rod (3) and the displacement sleeve (21) to move horizontally, and the displacement sleeve (21) passes through Block a (1) and block b (19) make the rocker arm (17) move horizontally on the rocker arm shaft (8). When the rocker arm (17) makes a horizontal displacement on the rocker arm shaft (8), the pin (20) fixedly connected with the rocker arm (17) moves along the inclined groove (801) to make a horizontal displacement in the axial direction, thereby changing the The position of the fulcrum between the rocker arm b (17) and the rocker arm a (15) and the length of the total "lever" change the swing law of the rocker arm and realize the continuous variable valve lift of the engine.

Claims (4)

1. A variable valve mechanism, characterized in that it consists of a stopper a (1), a bolt (2), a threaded rod (3), a motor shaft (4), a motor (5), a support a (6), a limiter Position boss a (7), rocker arm shaft (8), cover plate a (9), limit boss b (10), limit boss c (22), camshaft (12), cover plate b ( 13), limit boss d (14), rocker arm a (15), valve (16), rocker arm b (17), cam (18), stopper b (19), pin (20), displacement sleeve (21), support b (22), support c (23), wherein the displacement sleeve (21) is sleeved on the threaded rod (3) through threads, and the stopper a (1) and the stopper b (19) pass through The bolt (2) is fixed on the threaded rod (3); one end of the motor shaft (4) is connected with the motor (5), and the other end is fixed with the threaded rod (3); the motor (5) is installed on the support a (6) through the bolt ); the limit boss a (7) and the limit boss b (10) are fixed on the outer surface of the rocker shaft (8), and the cover plate a (9) and the support c (23) are placed on the limit boss Between the platform a (7) and the limit boss b (10), and connected by bolts; the rocker shaft (8) is placed between the cover plate a (9) and the support c (23), and clearance fit; The limit boss c (22) and the limit boss d (14) are fixedly connected to the outer surface of the camshaft (12), and the cover plate b (13) and the support b (22) are placed on the limit boss c (22). ) and the limit boss d (14), and are also connected by bolts; the camshaft (12) is placed between the cover plate b (13) and the support b (22), with clearance fit; the rocker arm a (15) ) one end is sleeved on the outer surface of the rocker arm shaft (8) and is fixedly connected, and the other end is suspended at the top of the valve (16); the cam (18) is fixedly connected to the outer surface of the camshaft (12); one end of the rocker arm b (17) It is sleeved on the outer surface of the rocker arm shaft (8), and the other end is placed at the lower end of the cam (18); the pin (20) is placed in the pin mounting hole (1702) provided by the rocker arm b (17), and is opened through the rocker arm shaft. The inclined groove (801) of the pin (20) is an interference fit with the pin mounting hole (1702), and a clearance fit with the inclined groove (801). 2. A variable valve mechanism according to claim 1, characterized in that the rocker arm a (15) is provided with a circular hole (1501), and the rocker arm b (17) is provided with a circular hole e (1701) ) and the pin mounting hole (1702), the round hole (1501) and the round hole e (1701) are respectively connected with the rocker arm shaft (8), the round hole (1501) is fixedly connected with the rocker arm shaft (8), the round hole e ( 1701) is slidably connected to the rocker shaft (8). 3. A variable valve mechanism according to claim 1, characterized in that the rocker arm shaft (8) is provided with an oblique groove (801), and the stopper a (1) is provided with a circular hole a (101) ) and round hole c (103), and four bolts pass through round hole b (102) around round hole a (101); the block b (19) is provided with round hole f (1901) and round hole b (1901) hole h (1903), and around the circular hole f (1901) are also provided with four bolts passing through the circular hole g (1902); the circular hole c (103) and the circular hole h (1903) are respectively arranged in the rocker arm b (17). ) on both sides, and is slidably connected to the rocker shaft (8). 4. A variable valve mechanism according to claim 1, characterized in that the displacement sleeve (21) is provided with a threaded through hole (2101) at the center of the shaft, and a ring platform (2102) is provided at the center portion, and Four fixing bolt holes (2103) are also arranged around the ring platform (2102).

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