CN113107630A

CN113107630A - Internal combustion engine valve control mechanism with bottom camshaft

Info

Publication number: CN113107630A
Application number: CN202110572124.7A
Authority: CN
Inventors: 罗远耀
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2021-07-13

Abstract

The invention discloses an internal combustion engine valve control mechanism in a bottom-mounted camshaft form, which comprises a push rod, a tappet, a cam, a cylinder cover, a valve rocker arm, a valve spring seat, a valve spring, a first push rod spring seat, a second push rod spring seat and a push rod spring, wherein the upper end of the push rod is movably connected with one end of the valve rocker arm, the lower end of the push rod is fixedly connected with the tappet, the cam drives the tappet to move up and down, the valve spring seat is arranged at the upper end of the valve, the other end of the valve rocker arm is positioned right above the valve, the valve rocker arm swings to drive the valve to move downwards, the first push rod spring seat is fixedly arranged at the top of the cylinder cover, the second push rod spring seat is fixedly sleeved at the lower part of the push rod, the push rod spring is sleeved on the push rod, and the two ends of the push rod, the engine operates stably, the combustion efficiency is improved, and the oil consumption and the noise are reduced.

Description

Internal combustion engine valve control mechanism with bottom camshaft

Technical Field

The invention relates to the technical field of automobile engines, in particular to an internal combustion engine valve control mechanism in a bottom camshaft mode.

Background

The valve control mechanism of the internal combustion engine with a bottom camshaft (OHV) comprises a valve, a valve rocker, a push rod, a tappet, a cam, a valve spring and other parts, wherein one end of the push rod is matched with the tappet, and the other end of the push rod is matched with the valve rocker to form transmission connection.

Disclosure of Invention

The invention aims to provide an internal combustion engine valve control mechanism in a bottom camshaft mode, which can assist a push rod to return, so that a valve is quickly closed, and further the combustion efficiency is improved.

In order to achieve the above purpose, the invention provides a valve control mechanism of an internal combustion engine with a bottom-mounted camshaft, comprising a push rod, a tappet, a cam, a cylinder cover, a valve rocker, a valve spring seat, a valve spring, a first push rod spring seat, a second push rod spring seat and a push rod spring, wherein the upper end of the push rod is movably connected with one end of the valve rocker, the lower end of the push rod penetrates through the cylinder cover and then is fixedly connected with the tappet, the cam drives the tappet to move up and down, the upper end of the valve is provided with the valve spring seat, the other end of the valve rocker is positioned right above the valve, the valve rocker swings to drive the valve to move downwards, the valve spring is sleeved on the upper part of the valve and positioned between the cylinder cover and the valve spring seat, the first push rod spring seat is fixedly arranged on the top of the, the push rod spring is sleeved on the push rod, and two ends of the push rod spring are respectively connected with the first push rod spring seat and the second push rod spring seat.

Based on the above, in this application, the push rod is upwards moved under the action of the cam, and pushes the valve rocker to rotate and push the valve spring seat, the push rod pushes the push rod spring to compress when upwards moving, after the push rod passes through the highest point on the cam, the inertia of the push rod continues to push the valve to open, the valve obtains the maximum opening amount during the circulation, after the kinetic energy of the push rod is converted into the elastic potential energy of the push rod spring and the valve spring, the push rod starts to reset, when the push rod resets, the push rod loses the acting force of the cam, and can timely reset under the action of the reset of the push rod spring, so that the engine operates stably, further the combustion efficiency is improved.

Preferably, the upper end surface of the cylinder cover is provided with at least two first threaded holes, the first push rod spring seat is axially provided with second threaded holes in one-to-one correspondence with the first threaded holes, and the first push rod spring seat is fixed on the top surface of the cylinder cover through bolts penetrating through the second threaded holes and the first threaded holes.

Preferably, the second push rod spring seat is a hexagon nut, and the lower end of the push rod is provided with an internal thread matched with the hexagon nut.

Preferably, the second push rod spring seat is annular, and the second push rod spring seat is welded at the lower part of the push rod.

Preferably, the compressible length of the push rod spring is 2-4 times of the valve lift.

Preferably, the valve spring is a double spring with an inner sleeve and an outer sleeve

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below.

FIG. 1 is a schematic structural view of a valve control mechanism for an internal combustion engine in the form of a bottom mounted camshaft according to an embodiment of the present invention;

reference numerals: the device comprises a push rod 1, a tappet 2, a cam 3, a cylinder cover 4, a valve rocker arm 5, a valve 6, a valve spring seat 7, a valve spring 8, a first push rod spring seat 9, a second push rod spring seat 10 and a push rod spring 11.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

Referring to fig. 1, the present embodiment provides a valve control mechanism of an internal combustion engine with a bottom camshaft, which includes a push rod 1, a tappet 2, a cam 3, a cylinder head 4, a valve rocker arm 5, a valve 6, a valve spring seat 7, a valve spring 8, a first push rod spring seat 9, a second push rod spring seat 10, and a push rod spring 11.

Specifically, the upper end of the push rod 1 is movably connected with one end of the valve rocker 5, so that the push rod 1 is driven to rotate when moving up and down, the lower end of the push rod 1 penetrates through the cylinder cover 4 and then is fixedly connected with the tappet 2, the cam 3 drives the tappet 2 to move up and down and drives the push rod 1 to move up and down, the upper end of the valve 6 is provided with the valve spring seat 7, the other end of the valve rocker 5 is located right above the valve 6, the valve rocker 5 swings to drive the valve 6 to move down, the valve spring 8 is sleeved on the upper portion of the valve 6 and located between the cylinder cover 4 and the valve spring seat 7, the first push rod spring seat 9 is fixedly arranged on the top of the cylinder cover 4, the second push rod spring seat 10 is fixedly sleeved on the lower portion of the push rod 1, the push rod spring 11 is sleeved on the push rod 1, and two ends of.

Based on the above, the push rod 1 is pushed by the cam 3 to move upwards, and pushes the valve rocker 5 to rotate and push the valve spring seat 7, when the push rod 1 moves upwards, the push rod spring 11 is pushed to compress, after the cam 3 moves to the highest point, the inertia of the push rod 1 continues to push the valve 6 to open, the valve 6 obtains the maximum opening amount during the circulation, when the kinetic energy of the push rod 1 is converted into the elastic potential energy of the push rod spring 11 and the valve spring 8, the push rod 1 starts to reset, when the push rod 1 resets, the push rod 1 loses the acting force of the cam 3, and can reset in time under the reset action of the push rod spring 11, so that the engine operates stably, further the combustion efficiency is improved, and the oil consumption and.

In the embodiment, the push rod 1 has momentum from low to high along with different rotating speeds of the cam 3, so that stepless adjustment of valve lift and air intake time is realized, and linear output of engine power is realized.

In this embodiment, at least two first threaded holes are opened on the upper end surface of the cylinder head 4, the second threaded holes corresponding to the first threaded holes one to one are opened in the axial direction of the first push rod spring seat 9, and the first push rod spring seat 9 is fixed on the top surface of the cylinder head 4 through bolts penetrating through the second threaded holes and the first threaded holes, so that the structure is simple and the cost is low.

In this embodiment, the second push rod spring seat 10 is a hexagon nut, the lower end of the push rod 1 is provided with an internal thread matched with the hexagon nut, the second push rod spring seat 10 and the push rod 1 are connected through a thread, the connection is simple and convenient, in other embodiments, the second push rod spring seat 10 may also be in an annular shape, and the second push rod spring seat 10 is welded at the lower part of the push rod 1.

In the embodiment, the compressible length of the push rod spring 11 is 2-6 times of the lift of the valve 6, so that the optimal push rod 1 return speed can be determined according to actual conditions.

In this embodiment, valve spring is interior overcoat and double spring, and double spring can further increase push rod 1's return rate to further promote combustion efficiency, reduce oil consumption and noise.

In the embodiment, the weight of the push rod 1 can be increased to 1.2-10 times of the original weight by additionally arranging the push rod spring 11, so that the kinetic energy generated by the mass of the push rod 1 provides the required lift for the valve.

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.

Claims

1. A valve control mechanism of an internal combustion engine with a bottom camshaft comprises a push rod (1), a tappet (2), a cam (3), a cylinder cover (4), a valve rocker (5), a valve (6), a valve spring seat (7) and a valve spring (8), wherein the upper end of the push rod (1) is movably connected with one end of the valve rocker (5), the lower end of the push rod (1) penetrates through the cylinder cover (4) and then is fixedly connected with the tappet (2), the cam (3) drives the tappet (2) to move up and down, the upper end of the valve (6) is provided with the valve spring seat (7), the other end of the valve rocker (5) is positioned right above the valve (6), the valve rocker (5) swings to drive the valve (6) to move downwards, the valve spring (8) is sleeved on the upper portion of the valve (6) and positioned between the cylinder cover (4) and the valve spring seat (7), the method is characterized in that:

still include first push rod spring holder (9), second push rod spring holder (10) and push rod spring (11), first push rod spring holder (9) set firmly in the top of cylinder head (4), the fixed overcoat in the lower part of push rod (1) of second push rod spring holder (10), push rod (1) are located in the cover to push rod spring (11), and both ends meet with first push rod spring holder (9), second push rod spring holder (10) respectively.

2. The internal combustion engine valve control mechanism of the bottom camshaft type according to claim 1, wherein the upper end surface of the cylinder head (4) is provided with at least two first threaded holes, the first push rod spring seat (9) is axially provided with second threaded holes corresponding to the first threaded holes one by one, and the first push rod spring seat (9) is fixed on the top surface of the cylinder head (4) through bolts penetrating through the second threaded holes and the first threaded holes.

3. An internal combustion engine valve control mechanism of the type having a bottom mounted camshaft as claimed in claim 1 wherein the second pushrod spring seat (10) is a hex nut and the lower end of the pushrod (1) is provided with an internal thread which mates with the hex nut.

4. An internal combustion engine valve control mechanism in the form of a bottom mounted camshaft according to claim 1, characterized in that the second pushrod spring seat (10) is annular and the second pushrod spring seat (10) is welded to the lower part of the pushrod (1).

5. An internal combustion engine valve control mechanism of the type with a bottom mounted camshaft according to claim 1, characterized in that the compressible length of the tappet spring (11) is 2-4 times the lift of the valve (6).

6. An internal combustion engine valve control mechanism of the type having a bottom mounted camshaft as claimed in claim 1 wherein said valve spring (8) is a double spring of inner and outer housing.