CN203050825U - Tappet - Google Patents

Abstract

The utility model discloses a tappet, which comprises an adjustment cam and a column body, the adjustment cam is located below the column body, and constitutes a high auxiliary mechanism with the column body, a notch is arranged on the upper part of the column body, and a slide block and return spring. Compared with the prior art, the length of the tappet in the utility model can be adjusted according to actual needs, so as to support the variable valve lift mechanism to realize full continuous control, which is beneficial to improve the power performance and performance of the engine in the full range of working conditions. economy.

Description

a tappet

technical field

The utility model belongs to the technical field of engines, in particular to a tappet and variable valve lift mechanism.

Background technique

The valve lift of a traditional gasoline engine is fixed and invariable. That is, there is only one cam profile of the engine camshaft. This makes it impossible for the lift to enable the engine to obtain the best intake air flow value in the high-load zone and low-load zone, and to obtain good power and economy. The valve lift-cam profile design of a traditional gasoline engine is a balanced selection based on comprehensive evaluation indicators for the engine under all operating conditions. As a result, the engine either meets the best fuel consumption rate at low load, or the best output torque at high load, and the two cannot be both.

The adoption of the variable valve lift mechanism enables the engine to obtain the required valve lift in both high-load and low-load areas. Thereby improving the power and economy of the engine in the whole range of working conditions. Most of the existing variable valve lift mechanisms can only achieve 2-stage or 3-stage adjustment, and cannot realize continuous adjustment. The engine combustion scheme is limited by this.

Contents of the invention

In view of this, the purpose of the utility model is to provide a tappet with adjustable length, which can realize continuous control and adjustment of the variable valve lift mechanism.

In order to solve the above technical problems, the technical solution provided by the utility model is to provide a tappet, which includes an adjustment cam and a cylinder, the adjustment cam is located below the cylinder, and forms a high auxiliary mechanism with the cylinder , the upper part of the cylinder is provided with a notch, and a slider and a return spring are placed in the notch.

Preferably, the return spring is located above the slider.

Compared with the prior art, the length of the tappet in the utility model can be adjusted according to actual needs, so as to support the variable valve lift mechanism to realize full continuous control, which is beneficial to improve the power performance and performance of the engine in the full range of working conditions. economy.

When the engine cam is in the base circle position and the adjustment cam is in the maximum lift position, the valve spring ensures that the valve is still in the closed position. That is, no matter what position the adjustment cam rotates to, as long as the engine cam is at the base circle position, the valve is in the closed state.

When the engine cam is at the base circle position and the adjusting cam is also at the base circle position, there will be a gap between the rocker arm and the tappet. In order to overcome this gap, the utility model designs a slider and a tappet return bit spring. Among them, the tappet return spring is in contact with the slider and the rocker arm respectively. If there is a gap between the slider and the rocker arm due to the rotation of the adjustment cam, the tappet return spring will become longer to overcome the gap and ensure the distance between the rocker arm and the tappet. preload between.

When the engine cam rotates from the base circle to the maximum lift position, the length of the tappet system can be changed by adjusting the position of the cam, thereby realizing the adjustment function of the valve lift.

The rotation angle of the adjustment cam determines the change of the additional lift of the valve. The adjustment camshaft is connected to the transmission disc, and the rotation angle of the transmission disc is controlled by the movement of the external transmission piston connected to the transmission disc, thereby controlling the rotation angle of the adjustment cam . Among them, the stroke of the transmission oil cylinder piston is determined by the oil intake and return oil volume of the transmission oil cylinder. The time of oil inlet and oil return and the amount of oil are controlled by the electromagnetic oil control valve. When the additional lift of the valve is not adjusted, the electromagnetic oil control valve does not work; only when the additional lift of the valve needs to be adjusted, the electromagnetic oil control valve works, which avoids the need for the electromagnetic oil control valve to be in the working state in each cycle, so the The opening and closing requirements and response characteristics of the electromagnetic oil control valve are not too high, which is relatively easy to realize.

Description of drawings

Fig. 1 is a schematic structural view of a preferred embodiment of the utility model.

Fig. 2 is a structural schematic diagram of the utility model applied to a fully variable lift valve mechanism.

Fig. 3 is a schematic diagram of an adjustment cam driving mechanism.

Fig. 4 is a structural schematic diagram of the electromagnetic oil control valve.

Detailed ways

The following will be described in conjunction with the accompanying drawings and specific embodiments.

Example 1

See Figures 1 through 4. The tappet described in this embodiment includes an adjustment cam 14 and a cylinder 11 . The adjusting cam 14 is located below the column body 11 and forms a high auxiliary mechanism with the column body 11. A notch is arranged on the upper part of the column body 11, and a slide block 12 and a return spring 13 are placed in the notch. The return spring 13 is located above the slider 12 .

The tappet described in the utility model is installed in the fully variable valve lift mechanism, and the upper end of the return spring 13 is hinged with the rocking arm 4 . The tappet 1 and the valve 6 are located on the same side of the rocker arm 4, and are respectively located at two ends of the rocker arm 4, and the engine cam 5 is on the other side of the rocker arm 4.

The adjustment cams 14 of each cylinder are tightly connected by an adjustment camshaft 15, one end of the adjustment camshaft 15 is fixedly connected to the transmission disc 2, and the adjustment camshaft 15 is perpendicular to the transmission disc 2, and the edge area of the transmission disc 2 is connected to the transmission cylinder 3 The piston rod 32, the cylinder end 33 of the transmission oil cylinder 3 is hinged on the frame. The transmission disc 2 can be circular, or directional, or elliptical, or bar-shaped. When the piston rod 32 of the transmission oil cylinder expands and contracts, it promotes the transmission disc 2 to make it rotate around the connection point between the adjustment camshaft 15 and the transmission disc 2 . And the oil inlet and oil outlet of transmission oil cylinder 3 are controlled by electromagnetic oil control valve 31. The electromagnetic oil control valve 31 is divided into two parts, an electromagnetic control part and an oil circuit control part. The oil circuit control part is divided into an oil inlet section, an oil control section and an oil outlet section in sequence, and a sealing seat surface is arranged between adjacent two ends. The oil inlet section is provided with an oil inlet hole 311 , the oil control section is provided with an oil control hole 312 , and the oil outlet section is provided with an oil outlet hole 313 . An oil inlet valve 315 and a return spring 317 are installed in the oil inlet section. When the oil inlet valve 315 fits with the sealing seat surface between the oil inlet section and the oil control section, the oil inlet section and the oil control section are completely cut off, and the oil control hole 312 communicates with the oil outlet hole 313 to form an oil passage. An oil outlet valve 316 is installed in the oil outlet section. When the oil outlet valve 316 fits the sealing seat surface between the oil control section and the oil outlet section, the oil control section and the oil outlet section are completely separated, and the oil inlet hole 311 and the oil control hole 312 are connected to form an oil channel. The oil inlet valve 315 and the oil outlet valve 316 are fixedly connected by a connecting rod, and the length of the connecting rod is greater than the distance between the two sealing seat surfaces. Only fits one of the two sealing seats.

When the solenoid coil of the electromagnetic control part is energized, the electromagnetic force generated by the armature moves the oil inlet valve 315 and the oil outlet valve 316 to the left together through the ejector rod until the oil outlet valve 316 is close to its sealing seat surface. At this time, the oil outlet valve The hole 313 is closed, the oil inlet hole 311 is opened, the oil enters the oil control hole 312 through the oil inlet hole 311, and then enters the cylinder body through the oil inlet 34 of the transmission cylinder, pushes the hydraulic piston, and the piston rod rises; when the electromagnet is powered off, The oil inlet valve 315 and the oil outlet valve 316 move to the right under the action of the hydraulic pressure and the return spring 317, the oil inlet valve 315 is close to its sealing seat surface, at this time, the oil inlet hole 311 is closed, and the oil outlet hole 313 is opened , the machine oil of the transmission oil cylinder returns to the oil outlet hole 313 from the oil outlet 35 through the oil control hole 312 and enters the engine oil pan, and the hydraulic piston returns.

The engine oil of the fully variable valve lift mechanism comes from the engine oil pan, and the power source of the hydraulic pump is the crankshaft. When the electronic control unit (ECU) obtains the engine speed and throttle position signals to determine the working condition of the engine, rely on the inspection Table interpolation, the opening moment and opening duration of the electromagnetic oil control valve are obtained from the MAP data inside the ECU. If the electromagnetic oil control valve does not operate at this time, the oil pumped by the hydraulic pump from the oil pan passes through the electromagnetic oil control valve and does not enter the transmission cylinder 3, but returns directly to the oil pan; if at this time, the variable valve system needs to work, according to the ECU After determining the opening moment and duration of the electromagnetic oil control valve, the oil pumped by the hydraulic pump enters the transmission cylinder 3 through the electromagnetic oil control valve to complete the adjustment of the tappet length. The ECU determines the energization time and energization duration of the electromagnetic oil control valve based on the control signal of the electromagnetic oil control valve obtained by the interpolation of the internal MAP data, and then determines the moment and the amount of oil entering the transmission cylinder 3 .

The above are only preferred implementations of the present utility model. It should be pointed out that the above-mentioned preferred implementations should not be regarded as limitations on the present utility model, and the protection scope of the present utility model should be based on the scope defined by the claims. For those skilled in the art, without departing from the spirit and scope of the utility model, some improvements and modifications can also be made, and these improvements and modifications should also be regarded as the protection scope of the utility model. the

Claims (2)

1. tappet, comprise that one adjusts cam (14), it is characterized in that, also comprise a cylinder (11), described adjustment cam (14) is positioned at cylinder (11) below, and constitute a higher pair mechanism with cylinder (11), cylinder (11) top is provided with notch, is placed with slide block (12) and return spring (13) in the notch.

2. a kind of tappet according to claim 1 is characterized in that, described return spring (13) is positioned at the top of slide block (12).

Images