CN102926834A - Mechanical type valve stroke continuously-variable device - Google Patents

Abstract

A mechanical valve lift continuously variable device in the technical field of mechanical design, comprising: an intake port, an exhaust port, a lower section of an intake valve, an exhaust valve, an upper section of an intake valve, a volume chamber, a moving body, a through pipe, The moving block and the moving rod, the moving body is installed in the volume cavity and is in sealing contact with the inner wall of the volume cavity, the through-tube runs through the upper and lower walls of the moving body, the moving block is installed in the through-tube and is in sealing contact with the inner wall of the through-tube, and moves The lower end surface of the block is a plane, the upper end surface of the moving block is an inclined plane, the upper section of the intake valve passes through the upper wall surface of the volume cavity and extends into the through pipe, and the lower end surface of the upper section of the intake valve is in sealing contact with the upper end surface of the moving block. When the moving body moves to the right, the lift of the intake valve becomes larger, and when the moving body moves to the left, the lift of the intake valve becomes smaller, and the lift of the intake valve can be continuously variable. The invention has reasonable design and simple structure, and is suitable for a variable lift system of an engine intake valve.

Description

Continuously variable mechanical valve lift

technical field

The invention relates to an engine intake system in the technical field of mechanical design, in particular to a continuously variable mechanical valve lift device.

Background technique

The valve lift of the traditional gasoline engine is fixed and invariable, that is, there is only one cam profile of the camshaft, which makes it impossible for the lift to make the engine respond well in both high-speed and low-speed areas. The valve lift or cam profile design of a traditional gasoline engine is a balanced choice for the engine under all operating conditions. As a result, the engine can neither get the best high-speed efficiency nor the best low-speed torque, but it can get The most balanced performance under all working conditions. The adoption of variable valve lift enables the engine to obtain the required valve lift in both high-speed and low-speed areas, thereby improving the high-speed power and low-speed torque of the engine.

After searching the existing technical literature, it is found that the Chinese patent application number is 200910190522.1, and the patent name is: a hydraulic valve mechanism with variable valve lift. This patent technology provides a device with variable valve lift, which can better Taking into account the high and low speed conditions of the engine. However, its design uses a hydraulic mechanism, which requires high sealing performance. If the seal is not tight, it will easily cause liquid leakage; and due to the certain compressibility of the liquid, the response speed of the valve lift change has a certain delay.

Contents of the invention

The present invention aims at the disadvantages of the above-mentioned prior art, and provides a mechanical valve lift continuously variable device, which can make the response speed of the change of the valve lift faster.

The present invention is achieved through the following technical proposals. The present invention includes: cylinder, piston, cylinder head, intake passage, exhaust passage, lower section of intake valve, exhaust valve, upper section of intake valve, volume cavity, moving body , through pipe, moving block and moving rod, the piston is installed in the space surrounded by the cylinder and is in sealing contact with the inner wall of the cylinder, the intake port and the exhaust port are connected with the cylinder head, and the moving body is installed in the volume chamber And it is in sealing contact with the inner wall of the volume chamber, the through-tube runs through the upper and lower walls of the moving body, the moving block is installed in the through-tube and is in sealing contact with the inner wall of the through-tube, the lower end of the moving block is a plane, and the upper end of the moving block is The upper section of the intake valve passes through the upper wall of the volume cavity and extends into the through pipe, the lower end surface of the upper section of the intake valve is in sealing contact with the upper end surface of the moving block, and the lower section of the intake valve passes through the lower wall of the volume cavity and extends into the through pipe. In the pipe, the upper end surface of the lower section of the intake valve is in sealing contact with the lower end surface of the moving block, and the moving rod passes through the left wall of the volume cavity to connect with the left wall of the moving body.

Further, in the present invention, the cross section of the volume cavity is rectangular, and the through pipe is a circular pipe with equal cross section.

In the present invention, the moving body and the moving block can move left and right in the volume cavity, and the moving block can also move up and down along with the upper section of the intake valve and the lower section of the intake valve in the through pipe. In low-speed working conditions, when the lift of the intake valve needs to be reduced, pull the moving rod to move to the left, and the moving body and the moving block also move to the left at the same time, and the lower end surface of the upper section of the intake valve slides relative to the upper end surface of the moving block. The lower section of the intake valve moves upward under the action of the compression spring, thereby reducing the lift of the intake valve. In high-speed working conditions, when the intake valve lift needs to be increased, push the moving rod to move to the right, then the moving body and the moving block also move to the right at the same time, and the lower end surface of the upper section of the intake valve slides relative to the upper end surface of the moving block , the lower part of the intake valve moves downward under the action of the compression spring, so that the lift of the intake valve becomes larger.

Compared with the prior art, the present invention has the following beneficial effects: the present invention is reasonable in design and simple in structure, which can better take into account the high and low speed conditions of the engine, and can make the response speed of the valve lift change faster.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation of A-A section among Fig. 1;

Among them: 1. Cylinder, 2. Piston, 3. Cylinder head, 4. Intake port, 5. Exhaust port, 6. Lower section of intake valve, 7. Exhaust valve, 8. Upper section of intake valve, 9. Volume Cavity, 10, moving body, 11, through pipe, 12, moving block, 13, moving rod.

Detailed ways

The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. This embodiment is based on the technical solution of the present invention, and provides detailed implementation methods and specific operating procedures, but the scope of protection of the present invention is not limited to the following embodiments. .

Example

As shown in Fig. 1 and Fig. 2, the present invention includes: including cylinder 1, piston 2, cylinder head 3, intake passage 4, exhaust passage 5, intake valve lower section 6, exhaust valve 7, intake valve upper section 8 , volume chamber 9, moving body 10, through pipe 11, moving block 12 and moving rod 13, the piston 2 is installed in the space surrounded by the cylinder 1 and is in sealing contact with the inner wall of the cylinder 1, the air inlet 4, the exhaust The channels 5 are all connected to the cylinder head, the moving body 10 is installed in the volume chamber 9 and is in sealing contact with the inner wall of the volume chamber 9, the through pipe 11 runs through the upper and lower walls of the moving body 10, and the moving block 12 is installed in the through pipe 11 And it is in sealing contact with the inner wall surface of the through pipe 11, the lower end surface of the moving block 12 is a plane, the upper end surface of the moving block 12 is a slope, the upper section 8 of the intake valve passes through the upper wall surface of the volume chamber 9 and extends into the through pipe 11, The lower end surface of the intake valve upper section 8 is in sealing contact with the upper end surface of the moving block 12, the intake valve lower section 6 passes through the lower wall surface of the volume cavity 9 and extends into the through pipe 11, the upper end surface of the intake valve lower section 6 is in contact with the moving block The lower end surface of 12 is in sealing contact, and the moving rod 13 passes through the left wall of the volume chamber 9 to connect with the left wall of the moving body 10. The cross section of the volume chamber 9 is rectangular, and the through pipe 11 is a round pipe of equal section.

In the present invention, the moving body 10 and the moving block 12 can move left and right in the volume cavity 9 , and the moving block 12 can also move up and down along with the intake valve upper section 8 and the intake valve lower section 6 in the through pipe 11 . In low-speed working conditions, when the lift of the intake valve needs to be reduced, the moving rod 13 is pulled to move to the left, and the moving body 10 and the moving block 12 also move to the left at the same time. The upper end surface slides relatively, and the lower section 6 of the intake valve moves upward under the action of the compression spring, so that the lift of the intake valve becomes smaller. In high-speed working conditions, when the intake valve lift needs to be increased, push the moving rod 13 to move to the right, then the moving body 10 and the moving block 12 also move to the right at the same time, the lower end surface of the upper section 8 of the intake valve and the moving block 12 The upper surface of the intake valve slides relatively, and the lower section 6 of the intake valve moves downward under the action of the compression spring, thereby increasing the lift of the intake valve. Therefore, the present invention can better take into account the high and low rotational speed working conditions of the engine.

Claims (2)

1. mechanical type valve lift continuous changeable device, comprise cylinder (1), piston (2), cylinder head (3), intake duct (4), air outlet flue (5), intake valve hypomere (6) and exhaust valve (7), piston (2) is installed in the space that cylinder (1) surrounds and with the internal face sealing of cylinder (1) and contacts, intake duct (4), air outlet flue (5) all is connected with cylinder head, characterized by further comprising intake valve epimere (8), cavity volume (9), moving body (10), run through pipe (11), moving block (12) and movement rod (13), moving body (10) is installed in the cavity volume (9) and with the internal face sealing of cavity volume (9) and contacts, run through up and down two walls that pipe (11) runs through moving body (10), moving block (12) is installed in to run through in the pipe (11) and with the internal face sealing that runs through pipe (11) and contacts, the lower end surface of moving block (12) is the plane, the upper-end surface of moving block (12) is the inclined-plane, intake valve epimere (8) passes the upper wall surface of cavity volume (9) and stretches into and runs through in the pipe (11), the lower end surface of intake valve epimere (8) contacts with the upper-end surface sealing of moving block (12), intake valve hypomere (6) passes the lower wall surface of cavity volume (9) and stretches into and runs through in the pipe (11), the upper-end surface of intake valve hypomere (6) contacts with the lower end surface sealing of moving block (12), and the left wall that movement rod (13) passes cavity volume (9) is connected with the left wall of moving body (10).

2. mechanical type valve lift continuous changeable device according to claim 1, the cross section that it is characterized in that described cavity volume (9) is rectangular, the described pipe (11) that runs through is the uniform section pipe.

Images