CN113623044A

CN113623044A - Auxiliary valve motion device of engine

Info

Publication number: CN113623044A
Application number: CN202010379501.0A
Authority: CN
Inventors: 朱汝杰; 奚正; 杨洲
Original assignee: Shanghai Youshun Automobile Technology Co ltd
Current assignee: Shanghai Youshun Automobile Technology Co ltd; Shanghai Universoon Auto Parts Co Ltd
Priority date: 2020-05-06
Filing date: 2020-05-06
Publication date: 2021-11-09

Abstract

An engine auxiliary valve motion device comprises a swing mechanism and a driving mechanism, wherein the swing mechanism comprises a swing piece which is arranged on a swing shaft and is positioned above an engine valve, the driving mechanism enables the swing piece to swing between a non-operation position and an operation position, and the swing piece is separated from the engine valve at the non-operation position; in the operating position, the oscillating member prevents the engine valve from seating closed, resulting in engine auxiliary valve motion. The mechanism of the invention is ingenious, compact, stable and reliable, has the advantages of low height, small volume, light weight and the like, can be arranged on engines with different sizes, and meets the requirements of different valve drives, such as helping the engine to be cold started and providing engine brake.

Description

Auxiliary valve motion device of engine

The technical field is as follows:

the invention relates to the field of machinery, in particular to an engine, and particularly relates to an auxiliary valve motion device of the engine.

Background art:

conventional valve actuation methods for vehicle engines are well known in the art and have been in use for over a hundred years. But due to the additional requirements of engine starting (especially cold start of diesel engines) and engine braking, more and more engines are requiring additional auxiliary valve movements on the basis of the conventional valve movements.

The invention content is as follows:

the invention aims to provide an auxiliary valve motion device of an engine, which aims to solve the technical problem that the engine is difficult to start (particularly cold start of a diesel engine) in the prior art and simultaneously solves the problems of complex mechanism, large system, high cost and the like of an engine brake.

The invention discloses an engine auxiliary valve motion device, which comprises a box body, a swing mechanism and a driving mechanism, wherein the swing mechanism comprises a swing piece arranged on a swing shaft, the swing shaft is arranged on the box body, and the engine auxiliary valve motion device is characterized in that: the oscillating member is positioned above the engine valve, and the driving mechanism enables the oscillating member to oscillate between a non-operation position and an operation position, wherein the oscillating member is disengaged from the engine valve; in the operating position, the oscillating member prevents the engine valve from seating closed, resulting in engine auxiliary valve motion.

Furthermore, the driving mechanism comprises a driving piston and a spring mechanism, the driving piston is arranged in a piston hole of the box body and is connected with the swinging mechanism, one end of the driving piston is acted by fluid pressure, the other end of the driving piston is acted by the spring force of the spring mechanism, and the driving piston enables the swinging piece to swing between the non-operation position and the operation position.

Further, the positioning mechanism of the swinging piece is further included, and the positioning mechanism enables the swinging piece to be in the same direction as the acting force direction of the engine valve and the opening direction of the engine valve when the swinging piece is in the operation position.

Further, the engine includes a valve bridge upon which the oscillating member in the operating position acts to prevent the engine valve below the valve bridge from seating closed to produce engine auxiliary valve motion.

Further, the swing mechanism comprises a ball stud.

Furthermore, one end of the swinging piece close to the engine valve is a cylindrical surface.

Furthermore, the box body is a rocker arm of the engine, the rocker arm is arranged on a rocker arm shaft in a swinging mode, and the swinging shaft is parallel to the rocker arm shaft.

Furthermore, the valve clearance compensation spring for preventing the valve from flying off is also included.

Further, the resulting engine auxiliary valve motion comprises valve motion for engine starting.

Further, the resulting engine auxiliary valve motion comprises valve motion for engine braking.

Compared with the prior art, the invention has positive and obvious effect. The invention can be integrated with the engine, thereby reducing the height, volume and weight of the engine; a hydraulic control valve is not needed, so that the cost is reduced, and the reaction time is shortened; the valve lift can be designed to have a smaller value, and the clearance between the engine piston and the air valve is reduced.

Description of the drawings:

FIG. 1 is a general schematic diagram of an embodiment of the engine auxiliary valve motion device of the present invention in an operative position within a rocker arm.

FIG. 2 is a general schematic diagram of an embodiment of the engine auxiliary valve motion device of the present invention in a non-operating position within a rocker arm.

FIG. 3 is a partially enlarged schematic illustration of an embodiment of the engine auxiliary valve movement apparatus of the present invention.

The specific implementation mode is as follows:

example (b):

as shown in fig. 1 to 3, the swinging member 12 of the swinging mechanism (see fig. 3 in detail) in the embodiment of the engine auxiliary valve movement device of the present invention is in the operating position (the vertically downward position shown in fig. 1) and the non-operating position (the inclined position shown in fig. 2). Fig. 1 includes three main components: an engine valve actuator 200, an engine valvetrain 300 (two valvetrain shown here), and an engine auxiliary valvetrain 100.

The engine valve actuator 200 includes a rocker arm 210 and a valve bridge 400 (also including a cam or even a pushrod, not shown here). The engine valve actuator 200 and the engine valve 300 together are commonly referred to as an engine valve drive train. The rocker arm 210 is swingably mounted on a rocker shaft 205, and is provided at both ends with valve

clearance adjusting mechanisms

50 and 150 for adjusting the engine valve clearance and the auxiliary valve clearance, respectively. The engine valve lash adjustment mechanism 50 includes a valve lash adjustment screw, a elephant foot pad, and a valve lash compensation spring 198, with relative motion between the adjustment screw and the elephant foot pad, the spring 198 being used to prevent any fly-off of the valve bridge 400 during auxiliary valve motion.

The engine valve 300 is held against a valve seat 320 in the engine block 500 by a valve spring 310, preventing the flow of gases between the engine cylinder and the gas line 600. The engine valve actuator 200 transfers mechanical motion of a cam (not shown) through a valve bridge 400 to the engine valves 300, causing them to open and close periodically.

The auxiliary valve motion mechanism 100 includes a case (the case in the present embodiment employs the engine rocker arm 210 shown in fig. 1 and 2), a swing mechanism 10, and a drive mechanism 20 (fig. 3). The swing mechanism 10 includes a swing member 12 mounted on a swing shaft 14, the swing shaft 14 is mounted on a rocker arm 210 in parallel with the rocker arm shaft 205, and the drive mechanism 20 swings the swing member 12 on the swing shaft 14. The oscillating member 12 is, in fig. 1, above the engine valve 301 and can oscillate between a non-operating position and an operating position. In the operating position shown in fig. 1 (with the pendulum 12 vertically downward), the pendulum 12 prevents the engine valve 301 from seating closed (keeping the valve 301 open a small amount, 330 a), resulting in engine auxiliary valve motion. In the non-operating position shown in fig. 2 (the oscillating piece 12 is inclined to the vertical), the oscillating piece 12 is disengaged from said engine valve 301 and does not have any influence on the engine valve movement.

The drive mechanism 20 of the present embodiment includes a drive piston 22 and a spring mechanism, with the drive piston 22 disposed within the piston bore 190 of the rocker arm 210. One end of the driving piston 22 is subjected to fluid pressure (e.g., oil pressure of the engine), and the other end of the driving piston 22 is subjected to the urging force of a spring 28 of the spring mechanism. The spring mechanism also includes spring seat 24 and retainer ring 26 (located within piston bore 190 of rocker arm 210).

The driving mechanism 20 is connected to the swing mechanism 10. The pivoting mechanism 10 comprises a ball stud 16, the ball of which ball stud 16 is located in a waist groove 23 of a drive piston 22 above the pivoting element 12. The translational movement of the drive piston 22 within the piston bore 190 of the rocker arm 210 translates the ball stud 16 into a rocking motion of the rocking member 12 on the rocking shaft 14 via the kidney slot 23. One end (lower end) of the oscillating piece 12 near the engine valve 301 is a cylindrical surface. The range of oscillation (oscillation angle) of the oscillating member 12 between the inoperative position and the operative position can be defined by the positioning mechanism. For example, the operating position of the pendulum 12 (fig. 1) can be determined by the right-hand plane of the pendulum 12 and a stop surface on the rocker arm (housing) 210. The inoperative position of the pendulum 12 (fig. 2) can be determined by the contact stop of the right end face of the drive piston 22 with the spring seat 24 and the stop ring 26 (fig. 3).

The present embodiment shows the auxiliary valve motion for engine starting, which works as follows: when the engine oil pressure acting on the driving piston 22 (left side) is less than the force of the spring 28 (right side) before the engine stops (engine valve complete stop motion) or when the engine starts (engine ignition), the driving piston 22 (left side) pushes the oscillating member 22 from the non-operating position (fig. 2) to the operating position shown in fig. 1 (vertically downward, when the oscillating member 12 is in the same direction as the force of the engine valve 301 and the direction in which the engine valve 301 opens), preventing the engine valve 301 opened by the engine valve actuator 200 from returning to the valve seat 320 to open it a small amount (the lift of the valve 301 is 330, typically not more than 2 mm), creating an engine auxiliary valve motion for engine starting, especially cold starting of a diesel engine.

When the engine is started and the engine is operating normally, the engine oil pressure acting on the drive piston 22 (left side) is greater than the force of the spring 28 (right side), and the drive piston 22 (right side) pushes the oscillating member 12 from the operating position shown in fig. 1 to the non-operating position shown in fig. 2 (inclined from the vertical direction), and its bottom surface (lower end surface) is disengaged from the lower valve bridge 400 (engine valve 301) without any engine auxiliary valve movement.

The examples of the present invention are illustrative of the present invention and not limiting thereof. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope and spirit of the invention. For example, the functionality illustrated or described for one particular mechanism may be used with another particular mechanism to yield a new mechanism. The box body in the embodiment can be not only a rocker arm, but also a valve bridge or even a fixed box body. Furthermore, the engine may be provided without a valve bridge, the oscillating piece of the oscillating mechanism acting directly on the engine valve. Also, the engine auxiliary valve motion device of the present invention has other applications besides engine starting, such as engine braking. Thus, the present invention is intended to embrace such modifications and variations as fall within the scope of the appended claims or equivalents thereof.

Claims

1. The utility model provides an engine auxiliary valve motion, includes box, swing mechanism and actuating mechanism, and swing mechanism is including installing the swing piece on the swing axle, and the swing axle is installed on the box, its characterized in that: the oscillating member is positioned above the engine valve, and the driving mechanism enables the oscillating member to oscillate between a non-operation position and an operation position, wherein the oscillating member is disengaged from the engine valve; in the operating position, the oscillating member prevents the engine valve from seating closed, resulting in engine auxiliary valve motion.

2. The engine auxiliary valve motion device according to claim 1, characterized in that: the driving mechanism comprises a driving piston and a spring mechanism, the driving piston is arranged in a piston hole of the box body and connected with the swinging mechanism, one end of the driving piston is acted by fluid pressure, the other end of the driving piston is acted by the spring force of the spring mechanism, and the driving piston enables the swinging piece to swing between the non-operation position and the operation position.

3. The engine auxiliary valve motion device according to claim 1, characterized in that: the positioning mechanism of the swinging piece is further included, and the positioning mechanism enables the swinging piece to be the same with the acting force direction of the engine valve and the opening direction of the engine valve when the swinging piece is in the operation position.

4. The engine auxiliary valve motion device according to claim 1, characterized in that: the engine includes a valve bridge upon which the oscillating member in an operative position acts to prevent the engine valve below the valve bridge from seating closed to produce engine auxiliary valve motion.

5. The engine auxiliary valve motion device according to claim 1, characterized in that: the swing mechanism comprises a ball stud.

6. The engine auxiliary valve motion device according to claim 1, characterized in that: one end of the swinging piece close to the engine valve is a cylindrical surface.

7. The engine auxiliary valve motion device according to claim 1, characterized in that: the box body is a rocker arm of the engine, the rocker arm is arranged on a rocker arm shaft in a swinging mode, and the swinging shaft is parallel to the rocker arm shaft.

8. The engine auxiliary valve motion device according to claim 1, characterized in that: the valve clearance compensation spring is used for preventing the valve from flying off.

9. The engine auxiliary valve motion device according to claim 1, characterized in that: the resulting engine auxiliary valve motion comprises valve motion for engine starting.

10. The engine auxiliary valve motion device according to claim 1, characterized in that: the resulting engine auxiliary valve motion comprises valve motion for engine braking.