CN103061846B - Variable air intake valve different lift device of motor - Google Patents

Abstract

A device for different lifts of variable intake valves of an engine, comprising: a stepped bushing, which is rotatably arranged in the stepped bushing and one end is aligned with the port at the front end of the stepped bushing, and the other end is The core gear shaft protruding from the rear end port of the stepped sleeve, the outer cam assembly fixedly sleeved on the outer circumference of the stepped sleeve, rotatably sleeved on the outer circumference of the stepped sleeve and fixedly connected with the core gear shaft located in the stepped sleeve The inner cam assembly is a phase angle adjustment device combined with the end of the core gear shaft protruding from the stepped sleeve and the outer cam in the outer cam assembly located at the end of the stepped sleeve. The variable intake valve different lift method and related devices of the present invention enable a pair of intake cams of each cylinder to produce continuously changing different angles, so that the valve lift difference is changed to generate vortex and adjust vortex, Then balance the contradiction between the gas movement organization in the cylinder and the intake air flow coefficient, and realize the overall optimization of the engine performance at the same time.

Description

A device for variable lifts of intake valves in engines

technical field

The invention relates to an engine. In particular, it relates to a device for variable lifts of different intake valves of an engine with adjustable lift difference between two intake valves of the same cylinder.

Background technique

For the engine, the presence of tumble and swirl at the same time is more conducive to the organization of the combustion process. However, the 4-valve engine is symmetrically arranged due to the dual intake port structure and the two cam profiles that drive the intake valves are almost the same, as shown in Figure 1. The two intake valves open to the same degree at the same time, so that the intake velocity and intake air volume of the two intake valves are the same at the same time, and the rotating airflow in the cross-sectional direction of the cylinder block cancels each other out, and the overall movement of the air in the cylinder is expressed as a single longitudinal direction In the tumble flow mode, there is almost no swirl flow, which is an important factor causing poor mixture formation and deteriorating combustion. If the vortex is obtained by using the tangential air passage or the rotating air passage, the structure of the cylinder head will be complicated and the airflow resistance will increase. When one intake valve is opened and the other intake valve is closed, a large vortex can be generated. Using a sliding variable intake structure and setting valves in the intake manifold can also generate vortex and control vortex, but both are equivalent to reducing Or cut off part of the intake passage, which affects the intake air volume. The Honda engine uses a three-stage VTEC, which uses three rocker arms and three cams to drive two valves. The difference in the lift curves of the main and secondary intake valves can generate swirl to promote combustion. The variable cam mechanism similar to the above-mentioned mechanism also includes the MIVEC mechanism of Mitsubishi Company and the Vario-Cam of Porsche Company. However, no matter whether the lifts of the two intake cams are reduced at the same time or the lift of one of the intake cams is reduced in these structures, the stronger vortex obtained is equivalent to partially closing two valves or one of the valves, which makes the flow capacity ratio The double intake valves (or intake ports) are fully open and the high vortex intensity is obtained at the expense of the intake flow. It is only suitable for low speed conditions. At high speeds, the intake flow is insufficient, so the two intake valves must be fully opened to ensure Intake flow, but no swirl. In order to solve the above problems, the invention patent of the device and related method of the different lift of the intake valve of the internal combustion engine (ZL200510013859.7) proposes the technology of the different lift of the intake valve, as shown in Figure 2. However, because the engine has different requirements for swirl motion and flow coefficient under different speeds and loads, the different lift method of the intake valve cannot adjust the swirl according to the working conditions.

At present, the method of obtaining stronger vortex in the air distribution structure of the engine is actually to partially close two valves or one of the valves, or directly reduce the intake air volume of one of the intake ports, so that the flow capacity is higher than that of the double intake valve (or double intake valve). The intake port) is fully open, and the high swirl intensity is obtained at the expense of the intake air flow.

Contents of the invention

The technical problem to be solved by the present invention is to provide an engine variable intake valve different lift device that can improve the gas flow characteristics in the engine cylinder and realize the overall optimization of the engine performance.

The technical solution adopted in the present invention is: a device for variable lift of the engine variable intake valve, comprising: a stepped bushing, which is rotatably arranged in the stepped bushing and the end of one end is connected to the stepped shaft The ports at the front end of the sleeve are aligned, and the other end protrudes from the core gear shaft of the rear end port of the stepped sleeve, and the outer cam assembly fixedly sleeved on the outer circumference of the stepped sleeve is rotatably sleeved on the outer circumference of the stepped sleeve and connected with the The inner cam assembly fixedly connected to the core gear shaft in the stepped sleeve is respectively combined with the end of the core gear shaft protruding from the stepped sleeve and the outer cam in the outer cam assembly located at the end of the stepped sleeve phase angle adjustment device.

A plurality of pin holes for fixing the outer cam assembly are formed on the stepped sleeve, and the outer cam assembly includes a front end cam, a rear end cam and more than one middle outer shaft cam, wherein the The front end cam is fixed on the front port of the stepped sleeve through the first outer shaft positioning pin and the pin hole on the front end of the stepped sleeve, and the rear end cam is fixed on the front port of the stepped sleeve through the second outer shaft positioning pin and the The pin hole on the rear end of the sleeve is fixed on the rear port of the stepped sleeve, and the above one or more middle outer shaft cams respectively pass through a third outer shaft positioning pin and are located between the two ends of the stepped sleeve. The corresponding pin holes are fixed on the stepped bushing.

The rear end of the rear end cam is integrally formed with a connecting sleeve for connecting the phase angle adjustment device, and right-handed internal teeth are formed on the inner peripheral surface of the connecting sleeve.

On the stepped bushing, between the front end cam and the middle outer shaft cam adjacent to the front end cam, between two adjacent middle outer shaft cams, and between the rear end cam and the middle outer shaft cam adjacent to the front end cam A bar-shaped hole is formed along the circumference of the stepped sleeve between the adjacent middle outer shaft cams of the rear end cam, and each bar-shaped hole is formed on the core gear shaft in the stepped sleeve. Pin holes are formed at the corresponding positions of the holes, and the inner cam assembly sleeved on the outer circumference of the stepped bushing includes the same number of inner shaft cams as the strip holes, and each inner shaft cam is formed by an inner shaft positioning pin and The core gear shaft is fixedly connected, and the inner shaft positioning pin passes through the bar-shaped hole on the stepped sleeve, and can move along the bar-shaped hole and the length direction.

The part of the core gear shaft protruding outward from the rear end port of the stepped sleeve is formed with a left-handed gear for combining with the phase angle adjustment device, and the port of this part of the core gear shaft The upper part is fixedly connected with an axial positioning plate by bolts.

The phase angle adjustment device includes a hydraulic adjustment mechanism and an inner and outer gear sleeve fixedly connected to the hydraulic adjustment mechanism through an annular connection frame and driven by the hydraulic adjustment mechanism, wherein the outer peripheral surface of the inner and outer gear sleeve is formed There are right-handed teeth for meshing with the right-handed internal teeth in the connecting sleeve on the rear end cam, and there are formed on the inner peripheral surface of the inner and outer gear sleeves for meshing with the left-handed gear on the core gear shaft. left-handed teeth.

The hydraulic adjustment mechanism includes: a piston, a piston sleeve rod fixedly connected to the piston at one end by a bolt, a hydraulic cylinder, and a front end cover and a rear end cover respectively connected to the front and rear ends of the hydraulic cylinder, wherein the piston The piston sleeve rod is located in the hydraulic cylinder and can only move along the axial direction of the hydraulic cylinder body. The other end of the piston sleeve rod passes through the front end cover and connects with the inner and outer gear sleeves through the ring connection frame. Fixedly connected, an oil hole is opened on the wall of the hydraulic cylinder corresponding to the front and rear ends of the piston, and the end of the core gear shaft with a left-handed gear runs through the The center of the piston rod and the center of the piston are fixedly connected to the axial positioning plate through bolts, and the outer peripheral part of the axial positioning plate is embedded between the rear end cover and the hydraulic cylinder formed within the groove.

The device for variable intake valve different lifts of the engine of the present invention, the variable intake valve different lift method and related devices enable a pair of intake cams of each cylinder to produce continuously changing different angles, thereby The valve lift difference is changed to generate and adjust the vortex, thereby balancing the contradiction between the gas movement organization in the cylinder and the intake air flow coefficient, and at the same time realizing the overall optimization of the engine performance.

Description of drawings

Fig. 1 is a kind of embodiment of existing different lift of intake valve;

Fig. 2 is another embodiment of the different lifts of the existing intake valves;

Fig. 3 is an embodiment of the different lift of the variable intake valve of the present invention;

Fig. 4 is another embodiment of the different lift of the variable intake valve of the present invention;

Fig. 5 is a schematic diagram of the overall structure of the device for variable intake valve different lifts of the engine of the present invention;

Fig. 6 is a schematic diagram of the external structure of the outer camshaft assembly of the present invention;

Fig. 7 is a schematic diagram of the internal structure of the outer camshaft assembly of the present invention;

Fig. 8 is a structural schematic diagram of the inner camshaft assembly of the present invention;

Fig. 9 is a schematic structural view of the out-of-phase angle adjusting device of the present invention;

FIG. 10 is a schematic diagram of the CC section in FIG. 9 .

in the picture

1: Outer cam assembly 2: Inner cam assembly

3: Phase angle adjustment device 4: Positioning pin of the first outer shaft

5: Front end cam 6: Stepped bushing

7: Middle outer shaft cam 8: Third outer shaft positioning pin

9: Rear end cam 10: Positioning pin of the second outer shaft

11: Inner shaft cam 12: Inner shaft positioning pin

13: Core gear shaft 14: Inner shaft positioning pin

15: Inner shaft cam 16: Axial positioning plate

17: Internal and external gear sleeves 18: Piston sleeve rod

19: Front end cover 20: Hydraulic cylinder

21: Piston 22: Rear end cover

23: Strip hole 24: Connecting sleeve

25: Left-handed gear 26: Ring connecting frame

27: intake cam 28: intake cam

Detailed ways

The device for variable intake valve different lifts of the engine of the present invention will be described in detail below in conjunction with the embodiments and the accompanying drawings.

As shown in Fig. 5, the device of the variable lift of the engine variable intake valve of the present invention includes: a stepped sleeve 6, which is rotatably arranged in the stepped sleeve 6 and the end of one end is connected to the stepped shaft The ports at the front end of the sleeve 6 are aligned, and the other end protrudes from the core gear shaft 13 of the rear end port of the stepped sleeve 6, and the outer cam assembly 1 fixedly sleeved on the outer circumference of the stepped sleeve 6 is rotatably sleeved on the stepped sleeve. The outer circumference of the shaft sleeve 6 and the inner cam assembly 2 fixedly connected with the core gear shaft 13 located in the stepped shaft sleeve 6 are respectively connected with the end of the core gear shaft 13 protruding from the stepped shaft sleeve 6 and the inner cam assembly located in the stepped shaft sleeve. 6 The phase angle adjustment device 3 combined with the outer cam in the outer cam assembly 1 at this end.

As shown in Fig. 6 and Fig. 7, a plurality of pin holes for fixing the outer cam assembly 1 are formed on the stepped bushing 6, and the outer cam assembly 1 includes a front end cam 5, a rear end cam 9 and more than one middle outer shaft cam 7, wherein, the front end cam 5 is fixed on the front port of the stepped shaft sleeve 6 through the first outer shaft positioning pin 4 and the pin hole located on the front end of the stepped shaft sleeve 6 Above, the rear end cam 9 is fixed on the rear port of the stepped sleeve 6 through the second outer shaft positioning pin 10 and the pin hole located on the rear end of the stepped sleeve 6, and the more than one middle part The outer shaft cams 7 are respectively fixed on the stepped bushing 6 through a third outer shaft positioning pin 8 and corresponding pin holes located between the two ends of the stepped bushing 6 .

The rear end of the rear end cam 9 is integrally formed with a connecting sleeve 24 for connecting the phase angle adjustment device 3 , and a right-handed internal gear is formed on the inner peripheral surface of the connecting sleeve 24 .

As shown in FIG. 8 , on the stepped bushing 6 , between the front end cam 5 and the middle outer shaft cam 7 adjacent to the front end cam 5 , between two adjacent middle outer shaft cams 7 A bar-shaped hole 23 is formed along the circumference of the stepped sleeve 6 between the rear end cam 9 and the middle outer shaft cam 7 adjacent to the rear end cam 9, and a strip hole 23 is formed on the stepped sleeve 6. On the core gear shaft 13 in 6, a pin hole is formed corresponding to each bar-shaped hole 23, and the inner cam assembly 2 sleeved on the outer periphery of the stepped sleeve 6 includes a bar-shaped There are the same number of inner shaft cams 11/15 in the holes 23, and each inner shaft cam 11/5 is fixedly connected to the core gear shaft 13 through an inner shaft positioning pin 12/14, that is, the inner shaft positioning pin 12/14 The connection of the inner shaft cam set and the core gear shaft 13 can be realized. The inner shaft positioning pin 12/14 passes through the bar-shaped hole 23 on the stepped sleeve 6, and can move along the bar-shaped hole 23 and the length direction. That is, when the core gear shaft 13 and the stepped sleeve 6 rotate relatively, the bar-shaped hole 23 provides the rotation amount for the inner shaft positioning pin 12/14, so as to prevent the core gear shaft 13 and the stepped sleeve 6 from being unable to rotate relative to each other.

The part of the core gear shaft 13 protruding from the rear end port of the stepped sleeve 6 protrudes outwards to form a left-handed gear 25 for combining with the phase angle adjustment device 3. The core gear shaft 13 The port of this part is fixedly connected with an axial positioning plate 16 by bolts, which can ensure that the core gear shaft 13 and the inner camshaft assembly 2 fixedly connected with the core gear shaft 13 are axially fixed.

As shown in Figure 9, the phase angle adjustment device 3 includes a hydraulic adjustment mechanism and an inner and outer gear sleeve 17 that is fixedly connected to the hydraulic adjustment mechanism through an annular connection frame 26 and driven by the hydraulic adjustment mechanism, wherein the The outer peripheral surface of the internal and external gear sleeve 17 is formed with right-handed teeth for meshing with the right-handed internal teeth in the connecting sleeve 24 on the rear end cam 9, so that the right-handed internal gear in the connecting sleeve 24 and the internal and external gear sleeves The right-handed teeth on the outside of 17 move axially, thereby realizing the rotation of the stepped bushing 6 and the outer camshaft assembly fixedly connected to the stepped bushing 6 . Left-handed teeth for meshing with the left-handed gear 25 on the core gear shaft 13 are formed on the inner peripheral surface of the inner and outer gear sleeves 17 . The structure of the left-handed gear 25 on the core gear shaft 13 moves relatively axially with the left-handed teeth in the inner and outer gear sleeves 17, thereby realizing the rotation of the core gear shaft 13 and the inner camshaft assembly 2 fixed on the core gear shaft 13.

The hydraulic adjustment mechanism includes: a piston 21, a piston sleeve rod 18 fixedly connected to the piston 21 by bolts at one end, a hydraulic cylinder 20, and a front end cover 19 and a rear end cover 22 respectively connected to the front and rear ends of the hydraulic cylinder 20. , wherein, the piston 21 and the piston sleeve rod 18 are located in the hydraulic cylinder 20 and can only move along the axial direction of the hydraulic cylinder 20, because a guide spline groove is formed in the hydraulic cylinder, and the piston The sleeve rod is formed with a spline structure, so the piston sleeve rod and the inner and outer gear sleeves only move axially but do not rotate. The other end of the piston sleeve rod 18 passes through the front end cover 19 and is fixedly connected with the inner and outer tooth sleeves 17 through the annular connecting frame 26, corresponding to the cylinder wall of the hydraulic cylinder 20. The front and rear ends of the piston 21 respectively open an oil hole E/F, and the end of the core gear shaft 13 with the left-handed gear 25 runs through the center of the piston sleeve rod 18 and the center of the piston 21 in turn. Finally, it is fixedly connected with the axial positioning plate 16 through bolts, and the outer peripheral part of the axial positioning plate 16 is embedded in the groove formed between the rear end cover 22 and the hydraulic cylinder 20 .

As shown in Figure 10, the inner and outer gear sleeves 17, the inner camshaft assembly, the outer camshaft assembly, the stepped sleeve 6 and the core gear shaft 13 are relatively axially displaced to realize the adjustment of the different angles of each pair of intake cams, and then Adjust valve lift difference, adjust and control swirl.

Therefore, as shown in Fig. 3 and Fig. 4, through the device of the present invention for variable lift of the intake valve of the engine, the adjustment of θ (referred to as the difference angle) is realized.

The working principle of the different angle adjustment of the device of the engine variable intake valve with different lifts of the present invention (refer to Figure 8): hydraulic oil enters the hydraulic adjustment mechanism from the E port, and pushes the piston to drive the piston rod to move to the right, so that the inner and outer The gear sleeve also moves to the right. Since the piston sleeve rod and the inner and outer gear sleeves can only move axially without rotation, and the left end of the core gear shaft is connected to the axial positioning plate, the core gear shaft does not move axially. Therefore, the inner and outer gears The left-handed teeth in the sleeve force the core gear shaft to rotate counterclockwise from left to right, that is, the inner camshaft assembly and the core gear shaft rotate counterclockwise together; while the right-handed teeth outside the inner and outer gear sleeves make the outer camshaft assembly and the stepped bushing rotate clockwise, so that an included angle appears between the inner camshaft assembly and the outer camshaft assembly, which is the difference angle θ between the rear end cam 9 and the inner shaft cam 15, the inner and outer gears The more the sleeve moves to the right, the larger the difference angle is. Similarly, when the hydraulic oil enters from the F port, the inner and outer gear sleeves are pushed to move to the left, and the left-handed teeth in the inner and outer gear sleeves move to the left along the core gear shaft. The left-handed teeth in the inner and outer gear sleeves are inclined but do not rotate, forcing the core gear shaft to rotate clockwise from left to right, that is, the inner camshaft assembly rotates clockwise, while the right-handed teeth on the outside of the inner and outer gear sleeves make the outer camshaft Turning the assembly counterclockwise gradually reduces the dissimilarity angle. In this way, the difference angle θ of the intake cam can be adjusted according to the working conditions to change the lift difference between the two intake cams, and then change the valve lift difference to adjust the swirl; 1. The right-handed teeth in the connecting sleeve on the end cam 9 of the outer camshaft assembly, the right-handed teeth and the left-handed teeth on the inner and outer sides of the inner and outer gear sleeves are always in mesh with each other. The gear sleeve cannot move axially, so the inner camshaft assembly and the outer camshaft assembly do not rotate relative to each other, which is equivalent to a camshaft that can rotate simultaneously.

Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only illustrative, rather than restrictive. Under the enlightenment of the present invention, people can also make many forms without departing from the purpose of the present invention and the scope of protection of the claims, and these all belong to the protection of the present invention.

Claims (2)

1. the device of the different lift of engine variable intake valve, it is characterized in that, comprise: ladder axle sleeve (6), align with the port part of described ladder axle sleeve (6) front end in ladder axle sleeve (6) and the end of one end that is arranged on that can rotate, the core gear shaft (13) of ladder axle sleeve (6) back-end ports is stretched out in the end of the other end, the fixing external cam assembly (1) being enclosed within ladder axle sleeve (6) periphery, what can rotate is enclosed within ladder axle sleeve (6) periphery and the cam ring assembly (2) be fixedly connected with the core gear shaft (13) being positioned at ladder axle sleeve (6), the phase angle adjuster (3) combined with core gear shaft (13) this one end of stretching out ladder axle sleeve (6) and the external cam of external cam assembly (1) that is arranged in ladder axle sleeve (6) this end respectively, described ladder axle sleeve (6) is formed with multiple pin-and-hole for fixing external cam assembly (1), described external cam assembly (1) includes front end cam (5), rearward end cam (9) and more than one middle part outer shaft cam (7), wherein, described front end cam (5) is fixed on the front port of ladder axle sleeve (6) by the first outer shaft locating stud (4) and the pin-and-hole that is positioned on ladder axle sleeve (6) front end, described rearward end cam (9) is fixed on the rear port of ladder axle sleeve (6) by the second outer shaft locating stud (10) and the pin-and-hole that is positioned in ladder axle sleeve (6) rearward end, described more than one middle part outer shaft cam (7) is respectively respectively fixed on ladder axle sleeve (6) by a 3rd outer shaft locating stud (8) and the corresponding pin-and-hole that is positioned between ladder axle sleeve (6) two ends, the rear end of described rearward end cam (9) is formed with the connecting sleeve (24) for connecting phase angle adjuster (3), the inner peripheral surface of described connecting sleeve (24) is formed with dextrorotation internal tooth, described phase angle adjuster (3) includes hydraulic adjuster structure and to be fixedly connected with described hydraulic adjuster structure with by circular connecting frame (26) and external tooth cover (17) in being driven by hydraulic adjuster structure, wherein, the outer circumferential face of described interior external tooth cover (17) being formed with the right-hand teeth for being meshed with the dextrorotation internal tooth in the connecting sleeve (24) on rearward end cam (9), the inner peripheral surface of described interior external tooth cover (17) being formed with the left-hand teeth for being meshed with the left-handed gear (25) on core gear shaft (13).

2. the device of the different lift of engine variable intake valve according to claim 1, it is characterized in that, on described ladder axle sleeve (6), be positioned between front end cam (5) and the middle part outer shaft cam (7) adjacent with this front end cam (5), a bar hole (23) is circumferentially formed between adjacent two middle parts outer shaft cam (7) and all along ladder axle sleeve (6) between described rearward end cam (9) and the middle part outer shaft cam (7) adjacent with this rearward end cam (9), the core gear shaft (13) being positioned at multidiameter shaft cover (6) is all being formed with pin-and-hole with described bar hole (23) corresponding section, the cam ring assembly (2) be enclosed within ladder axle sleeve (6) periphery includes the interior axis cam (11/15) with described bar hole (23) equal number, in each, axis cam (11/15) is fixedly connected with described core gear shaft (13) by an interior axle locating stud (12/14), described interior axle locating stud (12/14) runs through the bar hole (23) on ladder axle sleeve (6), and can move along described bar hole (23) and length direction.

3. the device of the different lift of engine variable intake valve according to claim 1, it is characterized in that, described stretch out the core gear shaft (13) of ladder axle sleeve (6) back-end ports this part on the outwardly left-handed gear (25) be formed for combining with described phase angle adjuster (3), the port of core gear shaft (13) this part has been bolted to connection axially locating plate (16).

4. the device of the different lift of engine variable intake valve according to claim 1, it is characterized in that, described hydraulic adjuster structure includes: piston (21), the piston loop bar (18) that one end and piston (21) are bolted to connection, hydraulic pressure cylindrical shell (20), and be connected to front cover (19) and the rear end cover (22) of hydraulic pressure cylindrical shell (20) rear and front end, wherein, described piston (21) and piston loop bar (18) are positioned at described hydraulic pressure cylindrical shell (20) and can only moving axially along hydraulic pressure cylindrical shell (20), the other end of described piston loop bar (18) is run through described front cover (19) and is fixedly connected with described interior external tooth cover (17) by circular connecting frame (26), before the barrel of described hydraulic pressure cylindrical shell (20) corresponds to described piston (21), an oilhole (E/F) is respectively opened at rear two ends respectively, be fixedly connected with axially locating plate (16) by bolt after this one end that described core gear shaft (13) has a left-handed gear (25) runs through the described center of piston loop bar (18) and the center of piston (21) successively, the outer peripheral portion of described axially locating plate (16) is embedded in and is formed in groove by between described rear end cover (22) and described hydraulic pressure cylindrical shell (20).