CN216866810U - Pure mechanical variable gas distribution device for internal combustion engine - Google Patents
Pure mechanical variable gas distribution device for internal combustion engine Download PDFInfo
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- CN216866810U CN216866810U CN202220414893.4U CN202220414893U CN216866810U CN 216866810 U CN216866810 U CN 216866810U CN 202220414893 U CN202220414893 U CN 202220414893U CN 216866810 U CN216866810 U CN 216866810U
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- joint
- push rod
- internal combustion
- combustion engine
- contact end
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 28
- 238000009434 installation Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 abstract description 6
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The utility model discloses a purely mechanical variable gas distribution device for an internal combustion engine, which comprises an upper joint, a lower joint and a rack; the upper joint is disc-shaped, a straight gear is arranged on the periphery of the upper joint, the upper part of the upper joint is connected with the lower end of the upper push rod through a push rod bearing, and the lower part of the upper joint is provided with an upper contact end; the upper end of the upper push rod is fixedly connected with the connecting end of a rocker arm of the internal combustion engine, and the end surface of the upper contact end is a spiral surface with taper; the upper part of the lower joint is provided with a lower contact end, and the lower part of the lower joint is connected with a tappet of an internal combustion engine through a lower push rod; the end of the lower contact end is a spiral surface with the taper matched with the end surface of the upper contact end; the rack is meshed with a straight gear outside the upper joint, is arranged in the rack guide rail and is driven by a linear motor. The utility model does not need to change the structure of the engine except the push rod, and the change cost is low; and the device is of a pure mechanical structure, and has the advantages of reliable working operation, simple structure, small processing difficulty, convenient control and low price.
Description
Technical Field
The utility model relates to the technical field of gas distribution of internal combustion engines, in particular to a purely mechanical variable gas distribution device for an internal combustion engine.
Background
With the proposition of carbon peak reaching and carbon neutralization targets, the public demands for ecological environment protection are increasing, and the emission regulations of all countries in the world are becoming stricter. The internal combustion engine is used as a main power source for human production and life, is a key implementation object and an observation target of each emission regulation, and the internal combustion engine industry faces serious challenges of energy conservation and emission reduction. The air is one of three elements of normal operation of the internal combustion engine and is controlled by an air distribution system. The traditional internal combustion engine drives the air valve by using a fixed camshaft, the lift and the opening and closing time of the air valve are fixed, so that the motion rule of the air valve is single, and different air distribution requirements under all working conditions cannot be met. In order to meet the air distribution requirement under the full working condition, a variable air distribution technology is developed. The technology can change the motion law of the air valve by changing the length of the push rod in the running process of the internal combustion engine, so that ideal time-surface values of the air inlet valve and the exhaust valve can be obtained under a plurality of working conditions and even under the whole working condition. The application of the variable gas distribution technology has obvious effects on the aspects of improving the efficiency of the internal combustion engine, reducing the emission of harmful substances and the like.
At present, the fully variable valve actuating mechanism applied to the internal combustion engine mainly comprises an electrohydraulic type, an electromagnetic type and a mechanical type. However, the electro-hydraulic variable valve has the problems of difficult control of oil pressure and oil quantity and difficult sealing; the electromagnetic variable valve has the defects of high cost, complex control and the like.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, the present invention aims to provide a purely mechanical variable valve actuating device for an internal combustion engine, which has the advantages of reliable operation, convenient control, low cost and good manufacturability. The technical scheme is as follows:
a pure mechanical variable valve actuating device for an internal combustion engine comprises an upper joint, a lower joint and a rack;
the upper joint is disc-shaped, a straight gear is arranged on the periphery of the upper joint, the upper part of the upper joint is connected with the lower end of the upper push rod through a push rod bearing, and the lower part of the upper joint is provided with an upper contact end; the upper end of the upper push rod is fixedly connected with the connecting end of a rocker arm of the internal combustion engine, and the end surface of the upper contact end is a spiral surface with the taper of 0;
the upper part of the lower joint is provided with a lower contact end, and the lower part of the lower joint is connected with a tappet of an internal combustion engine through a lower push rod; the end surface of the lower contact end is a spiral surface with the taper of 0, which is matched with the end surface of the upper contact end;
the upper contact end and the lower contact end are sleeved with push rod springs, and two ends of each push rod spring are abutted between the upper joint and the lower joint;
the rack is meshed with a straight gear outside the upper joint, is arranged in the rack guide rail and is driven by a linear motor.
Furthermore, the upper surface of the upper joint is provided with a trapezoidal bearing installation groove for installing a push rod bearing; the lower end of the upper push rod is arranged in the push rod bearing.
Furthermore, a lower push rod mounting groove is formed in the lower portion of the lower connector, a key groove is formed in the lower push rod mounting groove, and a key matched with the key groove is formed in the lower push rod.
Furthermore, the push rod spring is sleeved with a sleeve, the upper end of the sleeve is embedded in a cylindrical groove formed in the lower surface of the upper joint, and the lower end of the sleeve is embedded in a cylindrical groove formed in the upper surface of the lower joint.
The utility model has the beneficial effects that: the utility model does not need to change the structure of the engine except the push rod, and the change cost is low; and the device is of a pure mechanical structure, and has the advantages of reliable working operation, simple structure, small processing difficulty, convenient control and low price.
Drawings
Fig. 1 shows a purely mechanical variable valve gear for an internal combustion engine according to the utility model.
FIG. 2 is a schematic view of a top coupling structure according to the present invention; (a) a bottom view; (b) a side view; (c) and (4) a top view.
FIG. 3 is a schematic view of a lower connector structure according to the present invention; (a) a top view; (b) a side view; (c) and (4) bottom view.
FIG. 4 is a schematic view of the rack and rack guide of the present invention; (a) a rack; (b) a rack guide rail.
In the figure: 1-pushing up a push rod; 2-a push rod bearing; 3-upper joint; 4-a rack; 5-rack guide rail; 6-a linear motor; 7-a push rod spring; 8-a sleeve; 9-lower joint; 10-lower push rod; 11-an upper contact end; 12-lower contact end; 13-a spur gear; 14-bearing mounting grooves; 15-lower push rod mounting groove; 16-keyway.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, so as to further understand the concept, the technical problems solved, the technical features constituting the technical solutions, and the technical effects brought by the technical solutions.
It should be understood that these embodiments are illustrative and not restrictive, and that the described embodiments are only some, but not all, of the embodiments of the utility model. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, provided in the accompanying drawings, is not intended to limit the scope of the utility model, as claimed, but is merely representative of preferred embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.
As shown in fig. 1, the purely mechanical variable valve actuating apparatus for an internal combustion engine of the present invention comprises an upper joint 3, a lower joint 9 and a rack 4; the upper joint 3 is disc-shaped, a straight gear 13 is arranged on the periphery of the upper joint, the upper part of the upper joint is connected with the lower end of the upper push rod 1 through a push rod bearing 2, and the lower part of the upper joint is provided with an upper contact end 11; the upper end of the upper push rod 1 is fixedly connected with the connecting end of a rocker arm of the internal combustion engine, and the end surface of the upper contact end 11 is a spiral surface with the taper of 0; the upper part of the lower joint 9 is provided with a lower contact end 12, and the lower part of the lower joint is connected with a tappet of an internal combustion engine through a lower push rod 10; the end surface of the lower contact end 12 is a spiral surface with the taper of 0, which is matched with the end surface of the upper contact end 11. A push rod spring 7 is sleeved outside the upper contact end 11 and the lower contact end 12, and two ends of the push rod spring 7 abut against between the upper joint 3 and the lower joint 9; the rack 4 is meshed with a straight gear 13 outside the upper joint 3, is arranged in the rack guide rail 5 and is driven by a linear motor 6.
As shown in fig. 2, the upper surface of the upper joint 3 of the present embodiment is provided with a trapezoidal bearing installation groove 14 for installing the push rod bearing 2; the lower end of the upper push rod 1 is arranged in a push rod bearing 2.
As shown in fig. 3, the lower joint 9 of the present embodiment is provided with a lower push rod mounting groove 15 at the lower part thereof, a key groove 16 is provided in the lower push rod mounting groove 15, and a key matching with the key groove 16 is provided on the lower push rod 10.
The push rod spring 7 of this embodiment still overlaps outward and is equipped with sleeve 8, and the sleeve 8 upper end inlays in the cylinder inslot of locating the 3 lower surfaces of top connection, and the lower extreme inlays in the cylinder inslot that sets up in the 9 upper surfaces of lower clutch.
The specific processing details are as follows:
the upper push rod 1 is arranged at the upper end of the upper joint 3, a step with reduced diameter is processed at the contact end with the upper joint 3, and a rotating bearing is arranged; the upper push rod 1 is fixedly connected with the rocker arm connecting end to limit the rotation of the upper push rod 1. The upper joint 3 is provided with a trapezoidal hole in the contact end with the upper push rod 1 for installing the push rod bearing 2 and the upper push rod 1; the upper joint 3 is provided with a straight gear 13 outside the contact end with the upper push rod 1 and is in meshed transmission with the rack 4; the end face of the upper joint 3, which is in contact with the lower joint 9, is processed into a spiral surface with the taper of 0 and is matched with the lower joint 9; the upper joint 3 is provided with a cylindrical groove on the outer edge of the lower surface for placing a sleeve 8 to limit the horizontal displacement of the upper joint and the lower joint.
The lower joint 9 is arranged at the lower end of the upper joint 3, and the end surface of the lower joint 9, which is in contact with the upper joint 3, is processed into a spiral surface with the taper of 0 and is matched with the upper joint 3; the lower joint 9 is provided with a cylindrical groove on the outer edge of the upper surface and is used for placing the sleeve 8 and limiting the horizontal displacement of the upper joint and the lower joint; the outer surface of the lower joint 9 is provided with a step with the diameter increased for limiting the horizontal displacement of the push rod spring 7; a key groove 16 is processed in the lower joint 9 at the contact end with the lower push rod 10, and the lower joint is matched with the lower push rod 10; the lower end of the lower push rod 10 is connected with a tappet; the push-down rod 10 is not allowed to rotate.
The sleeve 8 is positioned in the cylindrical grooves of the upper joint and the lower joint and is used for limiting the horizontal displacement of the upper joint and the lower joint; the length of the sleeve is equal to the distance between the bottoms of the two cylindrical grooves after the upper joint and the lower joint are installed.
As shown in fig. 4, the rack 4 is engaged with the upper joint gear; the rack 4 is arranged on the guide rail of the rack seat. The linear motor 6 is installed between the rack 4 and the rack holder so that the rack 4 can slide on the rack holder. The number of other parts can be adjusted according to the cylinder number by the rack seat, and all racks are installed on the rack seat.
The working process is as follows: when the cam moves up and down by pushing the tappet and the push rod, the upper and lower push rods only do reciprocating motion and swing no matter whether the upper and lower joints rotate or not.
The ECU calculates an optimal time-surface value of air intake and exhaust through the current working condition of the engine, and then calculates the moving distance of the motor according to the time-surface value and the transmission ratio of the rack and the gear; the ECU sends a signal to the linear motor, and the linear motor moves for a certain distance; the linear motor 6 drives the rack 4 to move left and right on the rack seat, and the rack 4 drives the upper joint 3 to rotate; the upper joint 3 rotates, the contact surfaces of the upper joint and the lower joint rotate relatively, and the total length of the device changes in the rotating process due to the contact of the spiral surfaces; the length of the device is changed, so that the rotating angle of the rocker arm is changed under the condition of the same cam shaft rotating angle; the change of the rotation angle of the rocker arm changes the valve stroke and the opening and closing time, thereby changing the valve time-surface value.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A purely mechanical variable valve gear for an internal combustion engine is characterized by comprising an upper joint (3), a lower joint (9) and a rack (4);
the upper joint (3) is disc-shaped, a straight gear (13) is arranged on the periphery of the upper joint, the upper part of the upper joint is connected with the lower end of the upper push rod (1) through a push rod bearing (2), and the lower part of the upper joint is provided with an upper contact end (11); the upper end of the upper push rod (1) is fixedly connected with the connecting end of a rocker arm of the internal combustion engine, and the end surface of the upper contact end (11) is a spiral surface with the taper of 0;
the upper part of the lower joint (9) is provided with a lower contact end (12), and the lower part of the lower joint is connected with a tappet of an internal combustion engine through a lower push rod (10); the end surface of the lower contact end (12) is a spiral surface with the taper of 0, which is matched with the end surface of the upper contact end (11);
a push rod spring (7) is sleeved outside the upper contact end (11) and the lower contact end (12), and two ends of the push rod spring (7) are abutted between the upper joint (3) and the lower joint (9);
the rack (4) is meshed with a straight gear (13) outside the upper joint (3), is arranged in the rack guide rail (5), and is driven by a linear motor (6).
2. The purely mechanical variable valve gear for an internal combustion engine according to claim 1, wherein the upper joint (3) is provided at an upper surface thereof with a trapezoidal bearing mounting groove (14) for mounting the pushrod bearing (2); the lower end of the upper push rod (1) is arranged in the push rod bearing (2).
3. The purely mechanical variable valve gear for an internal combustion engine according to claim 1, wherein the lower part of the lower joint (9) is provided with a lower push rod installation groove (15), a key groove (16) is arranged in the lower push rod installation groove (15), and a key matched with the key groove (16) is arranged on the lower push rod (10).
4. The purely mechanical variable valve gear for an internal combustion engine according to claim 1, wherein the pushrod spring (7) is further sleeved with a sleeve (8), the upper end of the sleeve (8) is embedded in a cylindrical groove formed in the lower surface of the upper joint (3), and the lower end of the sleeve (8) is embedded in a cylindrical groove formed in the upper surface of the lower joint (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220414893.4U CN216866810U (en) | 2022-02-28 | 2022-02-28 | Pure mechanical variable gas distribution device for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220414893.4U CN216866810U (en) | 2022-02-28 | 2022-02-28 | Pure mechanical variable gas distribution device for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216866810U true CN216866810U (en) | 2022-07-01 |
Family
ID=82162257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220414893.4U Expired - Fee Related CN216866810U (en) | 2022-02-28 | 2022-02-28 | Pure mechanical variable gas distribution device for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216866810U (en) |
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2022
- 2022-02-28 CN CN202220414893.4U patent/CN216866810U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220701 |
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| CF01 | Termination of patent right due to non-payment of annual fee |