CN214063090U - Variable valve control system for internal combustion engine - Google Patents

Abstract

The utility model relates to a variable valve control system of an internal combustion engine, which comprises a plurality of variable valve devices and a driving device which is connected with and drives the variable valve devices; the variable valve device includes: a valve assembly, a rocker arm assembly, a lifter assembly, and an adjustment assembly connected to the lifter assembly for adjusting a lifter length; the tappet assembly comprises an upper tappet, a lower tappet and a loose piece positioned between the upper tappet and the lower tappet, and one end of the loose piece is connected to the lower tappet through threads; the adjusting assembly comprises a gear arranged on the periphery of the lower tappet and a rotating shaft for driving the gear to rotate; the driving device comprises a servo motor, a transmission shaft connected with the servo motor and a plurality of gear boxes arranged on the transmission shaft; the rotating shaft of each variable valve device in the variable valve devices is respectively connected with one of the gear boxes, and the gear boxes drive the rotating shafts to rotate at the same speed under the driving of the transmission shaft, so that the lower tappets are driven to rotate at the same rotating speed to adjust the length of the lower tappets screwed into the corresponding movable blocks.

Description

Variable valve control system for internal combustion engine

Technical Field

The utility model relates to an internal combustion engine technique, concretely relates to variable control system of high-power four-stroke internal-combustion engine valve stroke, the variable valve gear of the high-power internal-combustion engine of this system cooperation uses, makes multi-cylinder internal-combustion engine valve stroke variable, reaches uniformity, reliability, steady simple controllable, makes engine air-fuel ratio ideal, high-efficient matching, really accomplishes energy-conservation, environmental protection to further improve internal-combustion engine wholeness ability.

Background

With the rapid development of the internal combustion engine industry, various performance indexes are improved exponentially, higher requirements are put on the pressure flow matching of fuel and air combusted by the internal combustion engine and the air, and the air inflow is set by the change of the opening stroke of an air inlet valve of the internal combustion engine and the electronic injection fuel is organically combined. At present, a plurality of variable valve systems are introduced at home and abroad, which are basically controlled by hydraulic electromagnetic valves, and the requirement of sequentially controlling high-speed running strokes of up to twenty-cylinder internal combustion engines is difficult to realize long-term running consistency, and the reliability is poor.

SUMMERY OF THE UTILITY MODEL

Problem that utility model will solve:

in view of the above problems, an object of the present invention is to provide a variable valve control system for an internal combustion engine, which can ensure the valve stroke variable consistency of a high-power multi-cylinder internal combustion engine with a simple and reliable structure.

The technical means for solving the problems are as follows:

in order to solve the above problems, the present invention provides a variable valve control system for an internal combustion engine, including a plurality of variable valve devices and a drive device connected to and driving the plurality of variable valve devices; the variable valve apparatus includes: a valve assembly, a rocker arm assembly, a lifter assembly, and an adjustment assembly connected to the lifter assembly for adjusting lifter length; the tappet assembly comprises a lower tappet, an upper tappet and a loose piece positioned between the upper tappet and the lower tappet, and one end of the loose piece is connected to the lower tappet through threads; the adjusting assembly comprises a gear arranged on the periphery of the lower tappet and a rotating shaft driving the gear to rotate; the driving device comprises a servo motor, a transmission shaft connected with the servo motor and a plurality of gear boxes arranged on the transmission shaft; the rotating shafts of the variable valve device are respectively connected with the gear boxes, and the gear boxes drive the rotating shafts to rotate at the same rotating speed under the driving of the transmission shaft, so that the lower tappets are driven to rotate at the same rotating speed to adjust the lengths of the lower tappets screwed into the corresponding movable blocks.

According to the utility model discloses, can make full use of current structure and space of internal-combustion engine, combine together variable valve gear with drive arrangement, all other structures of internal-combustion engine need not change, need not to set up control system mounting platform specially, and organism camshaft box is existing mounting platform under the platform. The valve stroke of the multi-cylinder internal combustion engine can be changed consistently with a simple structure, the reliability is high, the service life is long, the valve stroke can be changed consistently and reliably, and meanwhile, the specified size of the intake valve can be opened quantitatively and consistently according to the power change and the fuel injection quantity of the internal combustion engine, so that the air-fuel ratio is organically combined, and the safe and reliable operation of the engine is guaranteed.

In addition, the present invention may be arranged such that the variable valve device is provided on the intake valve side of the internal combustion engine. Therefore, the variable valve device does not need to be additionally arranged under the condition that the exhaust valve does not need to control the valve stroke, and the modification cost can be saved.

Or, in the utility model, the gear in the adjusting component is a flat bevel gear; the adjusting assembly further comprises a vertical bevel gear arranged on the rotating shaft, and the vertical bevel gear is meshed with the flat bevel gear and limits the vertical movement of the horizontal bevel gear.

The present invention may also provide that the variable valve control system of the internal combustion engine further includes a guide bolt for limiting the rotation of the loose piece.

In addition, the present invention may be configured such that the variable valve control system for an internal combustion engine further includes a valve damping device located between the upper tappet and the rocker arm.

Also, in the present invention, the valve buffering device includes a buffering spring, a plug and an adjusting screw sleeve.

Or, in the utility model discloses in, when the internal-combustion engine is upright multi-cylinder internal-combustion engine, use one set the variable valve control system of internal-combustion engine.

Or, the utility model discloses in, when the internal-combustion engine is V type multi-cylinder internal-combustion engine, use two sets the variable valve control system of internal-combustion engine.

Has the advantages that:

the utility model discloses can ensure the variable uniformity of each valve stroke in the multi-cylinder internal-combustion engine with simple structure, the reliability is high, and long service life etc. can save the cost and simplify the transformation engineering, provides the guarantee for the combustion air-fuel ratio of internal-combustion engine matches the optimization.

Drawings

Fig. 1 is a schematic structural view of a variable valve control system of an internal combustion engine according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a variable valve gear in the variable valve control system of the internal combustion engine shown in fig. 1;

description of the symbols:

100. a variable valve device; 1. an internal combustion engine body; 2. a cylinder head; 3. a cam; 4. a roller; 5. a roller pin; 6. a roller seat; 7. a valve lift mechanism housing; 8. a lower tappet; 9. a roller seat spring; 10. flat bevel gears (gears); 12. bevel gear shafts (spindles); 13. a vertical bevel gear; 14. a loose block; 15. a variable valve device housing; 16. a seal ring; 17. a tappet sleeve; 18. a seal ring; 19. an upper tappet; 20. a buffer spring; 21. ejecting the head; 22. adjusting a threaded sleeve; 23. a rocker arm seat; 24. a rocker shaft; 25. a rocker arm; 26. a rocker arm adjustment screw; 27. a valve collet; 28. an upper seat of the valve spring; 29. a valve spring; 30. a valve spring lower seat; 31. an air valve; 32. a valve seat; 33. a guide bolt; 200. a drive device; 201. a servo motor; 202. a drive shaft; 203. a gear box (reducer).

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the following embodiments, which are to be understood as illustrative and not restrictive. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Disclosed is a variable valve control system for an internal combustion engine, which ensures variable valve stroke consistency in a high-power multi-cylinder internal combustion engine with a simple and reliable structure.

Fig. 1 is a schematic configuration diagram of a variable valve control system of an internal combustion engine according to an embodiment of the present invention. Fig. 2 is a schematic structural view of the variable valve apparatus 100 in the variable valve control system of the internal combustion engine shown in fig. 1.

As shown in fig. 1, a variable valve control system (hereinafter, simply referred to as "control system") for an internal combustion engine includes a plurality of variable valve devices 100 and a drive device 200 connected to the variable valve devices 100 to drive them in unison. In the present embodiment, the internal combustion engine is a vertical multi-cylinder four-stroke internal combustion engine, and therefore, one control system is adopted, and two control systems can be adopted when applied to a V-type multi-cylinder internal combustion engine. The structure and operation of the variable valve device 100 will be described in detail below with reference to fig. 2, and the details of the drive device 200 will be described later.

Referring to fig. 2, the four-stroke internal combustion engine may include an internal combustion engine body (e.g., a diesel body) 1, a cylinder head 2, and a variable valve apparatus 100. The variable valve gear 100 of the present invention includes a cam 3, a roller 4, a tappet assembly, a rocker arm assembly, a valve assembly, and an adjustment assembly.

The cam 3 is fixed on the camshaft (not shown), the roller 4 is fixed on the roller seat 6 by the roller pin 5, the roller seat 6 is installed in the valve jacking mechanism shell 7, and the valve jacking mechanism shell 7 is fixed on the internal combustion engine body (diesel engine body) 1.

The tappet assembly includes a lower tappet 8, an upper tappet 19, and a loose piece 14 located between the upper tappet 8 and the lower tappet 19. The lower tappet 8 is mounted on the roller mount 6 so as to be connected to the cam 3 by means of the roller 4 and the roller pin 5, and is jacked up or dropped down by the rotation of the cam 3. The roller seat spring 9 is installed between the roller seat 6 and the variable valve gear case 15, and the variable valve gear case 15 may be fixed to the valve lift mechanism case 7.

A loose piece 14 is arranged in the variable valve device shell 15, and the lower end of the loose piece 14 is connected with the upper end of the lower tappet 8 in a threaded connection mode. An upper tappet 19 is fixed to the upper end of the loose piece 14. The upper tappet 19 is provided with a tappet sleeve 17 on the outer periphery thereof, and the tappet sleeve 17 is fixed between the cylinder head 2 and the variable valve device housing 15, that is, one end of the tappet sleeve 17 is fixed to the cylinder head 2 and the other end is fixed to the variable valve device housing 15. The sealing rings 16 and 18 are arranged at the joint of the two ends of the tappet sleeve 17, so that oil leakage can be prevented. The upper lifter 19 may be connected to one end of the rocker arm assembly.

The rocker arm assembly may include rocker arm mounts 23, rocker arm shafts 24, rocker arms 25, and rocker arm adjustment screws 26. Rocker arm seat 23 is fixed on cylinder head 2, rocker arm shaft 24 is fixed on rocker arm seat 23; rocker arm 25 is mounted on rocker shaft 24, and rocker arm adjustment screw 26 is fixed to rocker arm 25. And the other end of the rocker arm assembly is connected with a valve assembly.

The valve assembly includes a valve collet 27, a valve spring upper seat 28, a valve spring 29, a valve spring lower seat 30, a valve 31, and a valve seat 32. The valve locking clamp 27 is fixed on the valve spring upper seat 28, the valve spring 29 is fixed between the valve spring upper seat 28 and the valve spring lower seat 30, the valve spring lower seat 30 and the valve guide sleeve are fixed on the cylinder cover 2, the valve 31 is arranged in the spring of the valve guide sleeve, the valve seat 32 is arranged on the cylinder cover 2, and the cylinder cover 2 is fixed on the internal combustion engine body 1.

In this embodiment, when the variable valve device 100 is operated, the cam 3 rotates, and thereby the roller 4, the roller pin 5, the roller seat 6, the lower tappet 8, the roller seat spring 9, the loose piece 14, the upper tappet 19, and the like are driven to move upward together, and one end of the rocker arm 25 is lifted up to rotate around the rocker shaft 24, and the other end of the rocker arm 25 is further pressed down to open the valve, thereby completing the intake and exhaust operations. Wherein the valve 31 lash can be set by adjusting the rocker adjustment screw 26.

The utility model discloses a variable valve gear still has the adjusting part who is used for adjusting tappet length, when needs change advance, the displacement, and adjusting part can change tappet length, and then changes the valve and open the stroke. In the present embodiment, the adjustment unit includes a flat bevel gear 10 provided on the outer periphery of the lower tappet 8, a bevel gear shaft 12 for driving the flat bevel gear 10, and a vertical bevel gear 13 provided at the tip end of the bevel gear shaft 12, wherein the vertical bevel gear 13 is engaged with the bevel gear shaft 12 and restricts the vertical movement of the bevel gear shaft 12.

The specific setting and implementation of the adjusting assembly are as follows: the valve jacking mechanism shell 7 is internally provided with a key groove, an inner hole is in contact with the roller seat, the valve jacking mechanism shell can move up and down and cannot rotate left and right, one end of the roller pin 5 is provided with a protruding key which is matched with the key groove of the jacking mechanism to move up and down, the lower tappet 8 is in transition matching with the roller seat 6, a gap is reserved, and the lower tappet 8 can rotate freely. The outer periphery of the middle part of the lower tappet 8 is matched with a flat bevel gear 10 (the inner hole is hexagonal), and the lower tappet 8 can penetrate through the hexagonal inner hole of the flat bevel gear 10 and can freely move up and down. The flat bevel gear 10 is connected to the drive means 200, in particular to a gear box 203 in the drive means, by a bevel gear shaft 12. The drive device 200 is fixed to the internal combustion engine body 1. The lower tappet 8 is rotated left and right by driving the bevel flat gear 10 by the driving unit 200. The vertical bevel gear 13 is connected to the bevel gear shaft 12, and is screwed into or withdrawn from the movable block 14 with a guide groove, and a guide bolt 33 is arranged in the movable block groove, can not rotate left and right, can only move up and down to adjust the length. The bevel gear shaft is connected with a driving device 200, so that the driving device 200 drives the bevel gear shaft 12 to drive the flat bevel gear, the flat bevel gear 10 and the lower tappet 8 to rotate, and the push-pull block 14 is pulled to achieve the purpose of adjusting the length of the whole tappet.

When the power of the internal combustion engine is changed to change the valve stroke, the flat bevel gear 10 drives the lower tappet 8 to rotate left and right, the depth of the lower tappet 8 screwed into the movable block is adjusted by means of the threaded connection between the lower tappet 8 and the movable block 14, a lower tappet screw is connected with the movable block 14, a movable block groove is positioned by a 33 guide bolt and cannot rotate, and only can move up and down, the lower tappet 8 is driven by the flat bevel gear 10 to rotate, the lower tappet 8 threads enter the movable block 14, when the lower tappet is driven by the gear to rotate forward and enters the movable block deeper, the lower tappet is shorter as a whole, the reverse direction is longer, and the tappet length is adjusted by the depth of the lower tappet 8 screwed into the movable block, so that the variable valve stroke is achieved.

Further, considering the fact that the tappet length is reduced as a whole, there is a possibility that the valve clearance will increase infinitely, and the valve seating rough impact force will increase, thereby damaging the valve. Therefore, in a preferred embodiment, a set of valve cushioning devices may also be added to the upper portion of the upper lifter 19.

As shown in fig. 2, the valve buffering device includes a plug 21, an adjusting screw 22, and a buffering spring 20. In operation, the upper tappet 19 pushes the damping spring 20, the plug 21 and the adjusting screw 22 together to move upward. When the tappet is shortened, the pre-tightened buffer spring 20 is partially restored to still support the top 21 and not loosen (the spring strength is that the top does not open the valve), when the upper tappet 19 pushes the buffer spring to cause the top 21 to be clamped and collided, the valve is opened, and the adjusting screw sleeve 22 leaves a certain space allowance, so that the spring plays a certain buffering role when the valve is seated.

The variable valve device 100 including the adjustment unit including the flat bevel gear 10, the bevel gear shaft 12, and the vertical bevel gear 13 provided at the tip end of the bevel gear shaft 12 has been described above, but the present invention is not limited thereto. The adjusting assembly may also be a worm and worm gear structure, and a worm as a rotating shaft 12 is driven by the driving device 200 to drive a worm gear as a gear 10, so as to adjust the length of the lower tappet 8 screwed into the loose piece 14, thereby realizing variable valve stroke.

The utility model discloses in, can adjust tappet length reliably with the help of the mechanical regulation of gear, do not have hydraulic pressure regulating unit oil leak problem moreover. The gear is adjusted for current ejector pad and is adjusted, and is more reliable, and the gear is difficult for wearing and tearing moreover.

As shown in fig. 1, the variable valve device 100 described above may be mounted for each cylinder of a multi-cylinder internal combustion engine having up to several tens of cylinders. Specifically, the variable valve device 100 may be provided for both the intake valve and the exhaust valve of each cylinder, or may be provided for only the intake valve of each cylinder as in fig. 1 if it is not necessary to control the valve stroke of the exhaust valve. The valve strokes of the plurality of variable valve devices 100 are then adjusted in unison by the drive device 200.

The driving device 200 includes a servo motor 201, a drive shaft 202 connected to an output shaft of the servo motor 201, and a plurality of gear boxes 203 provided on the drive shaft 202. The servo motor 201 functions as a power source, and can output forward and reverse rotations according to the number of cylinders of the internal combustion engine and the length required for the tappet, thereby driving the propeller shaft 202 connected to the output shaft. The gear boxes 203 are speed reducers, and are connected to the rotating shafts 12 of the adjusting units in the variable valve device 100.

Since the plurality of gear boxes 203 are identical in model and specification and are sequentially provided on the propeller shaft 202 at the same reduction ratio, the rotational frequency of the servo motor 201 is directly transmitted to each gear box 203. When the driving device 200 is operated, the plurality of gear boxes 203 drive the plurality of rotating shafts 12 to rotate at the same rotational speed under the driving of the transmission shaft 202, thereby driving the respective lower lifters 8 of each variable valve device 100 to rotate at the same rotational speed, and further screwing the lower lifters 8 into the respective corresponding loose pieces 14 at the same rotational speed and depth. Therefore, the bevel gears in all the variable valve device 100 can be driven to rotate with high consistency and reliability, and the synchronous variable of the valve stroke of the multi-cylinder internal combustion engine is realized.

Further, a special speed reducer may be provided between the servo motor 201 and the drive shaft 202, and a low rotation speed may be output to the respective connected rotating shafts 12 through the gear box 203.

At present, most of the variable valve stroke devices researched and developed at home and abroad are directly arranged on the top end of the valve of the cylinder cover and are driven by hydraulic pressure, so that the long-term oil leakage is difficult to achieve. And the electromagnetic valve is used for controlling, so that a brand new design and reconstruction project is large for the cylinder cover of the existing internal combustion engine, the requirement on the electromagnetic valve is high, the response sensitivity of the internal combustion engine is greatly tested for long-time running under high-speed running, and the control consistency of the multi-cylinder valve is difficult to ensure, so most of the developed variable valve devices are still tested on a single-cylinder engine platform, and are not applied to a real engine. According to the utility model discloses, can make full use of the current structure of internal-combustion engine and space, combine variable valve and control system and the (air) intake valve climbing mechanism of current internal-combustion engine very rationally, all other structures of internal-combustion engine do not need to change, need not to set up control system mounting platform specially, and organism camshaft box is existing mounting platform under the platform. Therefore, the valve stroke of the multi-cylinder internal combustion engine can be changed consistently by a very ingenious and simple structure, the reliability is high, the service life is long, the cost can be saved, the reconstruction project can be simplified, and the guarantee is provided for optimizing the combustion air-fuel ratio of the internal combustion engine.

High performance engine air-fuel ratio matches and is all being the main subject in research in all enterprises of global relevance, and fuel control all adopts the electron to spray and has solved, matches the air quantity according to the oil mass size, does not yet like the utility model discloses the variable valve control system of simple and reliable internal-combustion engine like this, when guaranteeing the variable uniformity of valve stroke and reliability, according to internal-combustion engine power change, how much quantitative unanimous intake valve size of opening the regulation of fuel injection makes the air-fuel ratio obtain organic combination, and is adjustable at will, makes the fuel obtain the abundant burning, reaches energy-concerving and environment-protective, provides the guarantee for the safe and reliable operation of engine.

Claims (8)

1. A variable valve control system of an internal combustion engine, characterized in that,

includes a plurality of variable valve devices and one driving device connected to and driving the plurality of variable valve devices;

the variable valve apparatus includes: a valve assembly, a rocker arm assembly, a lifter assembly, and an adjustment assembly connected to the lifter assembly for adjusting lifter length;

the tappet assembly comprises a lower tappet, an upper tappet and a loose piece positioned between the upper tappet and the lower tappet, and one end of the loose piece is connected to the lower tappet through threads;

the adjusting assembly comprises a gear arranged on the periphery of the lower tappet and a rotating shaft driving the gear to rotate;

the driving device comprises a servo motor, a transmission shaft connected with the servo motor and a plurality of gear boxes arranged on the transmission shaft;

the rotating shaft of each variable valve device in the variable valve devices is respectively connected with one of the gear boxes, the gear boxes drive the rotating shafts to rotate at the same rotating speed under the driving of the transmission shaft, and therefore the lower tappets are driven to rotate at the same rotating speed to adjust the length of the corresponding loose pieces screwed into the lower tappets in a consistent manner.

2. The variable valve control system for an internal combustion engine according to claim 1,

the variable valve device is provided on an intake valve side of the internal combustion engine.

3. The variable valve control system for an internal combustion engine according to claim 1,

the gear in the adjusting component is a flat bevel gear;

the adjusting assembly further comprises a vertical bevel gear arranged on the rotating shaft, and the vertical bevel gear is meshed with the flat bevel gear and limits the vertical movement of the horizontal bevel gear.

4. The variable valve control system for an internal combustion engine according to claim 1,

the variable valve control system for an internal combustion engine further includes a guide bolt for restricting rotation of the loose piece.

5. The variable valve control system for an internal combustion engine according to claim 1,

the variable valve control system for an internal combustion engine further includes a valve damping device located between the upper lifter and the rocker arm.

6. The variable valve control system for an internal combustion engine according to claim 5,

the valve buffering device comprises a buffering spring, a top and an adjusting threaded sleeve.

7. The variable valve control system for an internal combustion engine according to claim 1 or 2,

when the internal combustion engine is a vertical multi-cylinder internal combustion engine, the internal combustion engine variable valve control system is used.

8. The variable valve control system for an internal combustion engine according to claim 1 or 2,

when the internal combustion engine is a V-shaped multi-cylinder internal combustion engine, two sets of variable valve control systems of the internal combustion engine are used.

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