CN109340306A - A kind of uniaxiality balance axle system of variable compression ratio engine - Google Patents
A kind of uniaxiality balance axle system of variable compression ratio engine Download PDFInfo
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- CN109340306A CN109340306A CN201811148868.0A CN201811148868A CN109340306A CN 109340306 A CN109340306 A CN 109340306A CN 201811148868 A CN201811148868 A CN 201811148868A CN 109340306 A CN109340306 A CN 109340306A
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- Prior art keywords
- gear
- compression ratio
- variable compression
- axle system
- ratio engine
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/22—Compensation of inertia forces
- F16F15/26—Compensation of inertia forces of crankshaft systems using solid masses, other than the ordinary pistons, moving with the system, i.e. masses connected through a kinematic mechanism or gear system
- F16F15/264—Rotating balancer shafts
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The invention discloses a kind of uniaxiality balance axle systems of variable compression ratio engine.It is installed on the balance shaft on engine cylinder body including being located at crankshaft side, the balance shaft is eccentric shaft structure, and the balance shaft front end is connect by driven gear with the sliding tooth wheel drive being located on crankshaft.The present invention can be well isolated from the torsional oscillation of three cylinder machine crankshafts under the premise of meeting the functional requirement of balancing inertia torque, reduce gear engagement noise.
Description
Technical field
The invention belongs to technical field of automobile engine, and in particular to a kind of uniaxiality balance axis of variable compression ratio engine
System.
Background technique
Current automotive industry requires higher and higher, the miniaturization of automobile engine forward direction, big detonation pressure side for energy-saving and environment-friendly
To development, current each Automobile Enterprises propose various solutions to cope with engine power performance and Eco-power raising.
Such as published patent, it is used to have such as a variety of known to WO 98/51911, WO 00/31377, WO 03/008783
There are the engine embodiment of variable compression ratio, the internal combustion engine operation that this kind of engine is used to use under changing load and speed
When by adjusting effective discharge capacity or compression ratio improve its whole efficiency.Such as published patent WO 03/008783, can be changed
The mechanical driving device of compression ratio engine contains at least one cylinder, and bottom is connected to the piston on transmission parts in the cylinder
On the one hand middle up and down motion, the transmission parts pass through small size rack gear and cooperate with the guiding device with rolling bearing, another party
Face is cooperated by another large scale rack gear with the gear being connected on connecting rod.The connecting rod of the variable compression ratio engine of this type
It is connected by gear with burning the cylinder piston and control the cylinder piston, the gear being connected with connecting rod plays leverage, for adjusting in real time
Save the compression ratio of such engine, it can be seen that the engine of this type have for Transmission Engine one it is important
Feature, i.e., it is many times larger toward complex inertia mass.In addition, crankshaft system torsional oscillation mentions accessory wheel system components since detonation pressure is larger
New challenge is gone out, for three cylinder variable compression ratio engines, the size of crankshaft torsional vibrations is compared with conventional engines
It greatly improves.However, designing common sense according to engine needs to design balance shaft system to it when reciprocal inertia force square is larger
It is balanced, to balance single order two-stage reciprocating inertia force square (can not consider more than second order), need to be arranged two balance shafts, reflect
It is compact in current engine structure, arrangement space is limited, uniaxiality balance axle system is also a kind of relatively effective solution party
Case.
The characteristics of the first order reciprocating inertia force square can only be generally balanced based on uniaxiality balance axle system, existing uniaxiality balance axis
System is most of, and structure is complicated, has a single function, and is driven using chain driving or metal gear, cannot when reciprocal inertia force square is larger
When well solving the NVH problem of whole system, and being applied to three cylinder machines, since crankshaft torsional vibrations are big compared with four-cylinder, unavoidably
The problem of bringing in terms of torsional oscillation.The balance shaft as disclosed in patent CN107676174 and CN205806326 subtracts although introducing
Shake gear, can be effectively reduced the size of crankshaft torsional vibrations, but after this kind of balance shaft of application, engine need to be provided separately lubricating oil pump and
The drive scheme of other attachmentes leads to complicated integral structure, and for variable compressive described in patent WO 03/008783
Than engine, since reciprocal inertia force is huge, enough spaces can not be provided to balance reciprocal inertia force square.
Summary of the invention
The object of the invention is in order to solve deficiency existing for above-mentioned background technique, provide a kind of vibration isolating effect it is obvious,
Functional diversities, compact-sized, the uniaxiality balance axle system of variable compression ratio engine that is easy for installation and removal.
The technical solution adopted by the present invention is that: a kind of uniaxiality balance axle system of variable compression ratio engine, including be located at
Crankshaft side is installed on the balance shaft on engine cylinder body, and the balance shaft is eccentric shaft structure, and the balance shaft front end passes through
Driven gear is connect with the sliding tooth wheel drive being located on crankshaft.
Further preferred structure, the balance shaft are fixedly arranged at the front end with transmission gear and forward horizontal stand counterweight, and rear end is fixed
There is rear counterweight.
Further preferred structure, the driven gear be decoupling gear, the decoupling gear include gear ring, rubber ring,
Wheel hub, the rubber ring is between the gear ring and the wheel hub；The wheel hub is integrated in one with forward horizontal stand counterweight.
Further preferred structure is equipped with aligning structure between the driving gear and decoupling gear.
Further preferred structure, the aligning structure include two the first counterbores, described for driving Gear Root setting
The second counterbore of Gear Root setting is decoupled, the second counterbore on the decoupling gear is located at two the first counterbores of driving gear
Between.And inner ring web thickness is uneven, it is described that repeated hole and the not uniform thickness web is gone on the one hand to can be used for loss of weight, on the one hand
It can be used for adjusting crankshaft imbalance amount.
Further preferred structure, the forward horizontal stand counterweight wheel hub web are unsymmetric structure, and forward horizontal stand counterweight is generally
Semicircle shape structure.
Further preferred structure, the rear counterweight wheel hub web is unsymmetric structure, and rear counterweight wheel is whole
For semicircle shape structure.
Further preferred structure, the decoupling gear lower section are equipped with oil baffle, and the oil baffle is by being disposed around
Bolt fastening on oil sump.
Further preferred structure, the rear counterweight are integrated in one with wet type belt pulley, the rear counterweight
Inside has the wheel hub cooperated with the wet type belt pulley gear ring, and the wet type belt pulley gear ring is pressed into the rear counterweight
On wheel hub.
Further preferred structure, the rear counterweight are equipped with the boss with third threaded hole.The third screw thread
Hole is used to adjust the uneven inertia after balance shaft assembly assembly: if amount of unbalance is overproof, the adjustable screw thread hole depth；
If amount of unbalance is insufficient, it can be screwed into the clump weight of certain mass by the threaded hole, increase assembly amount of unbalance.
Further preferred structure, the forward horizontal stand counterweight and rear counterweight wheel hub inner ring be equipped with for the balance
Axis positioning surface cooperates the first positioning surface and the second positioning surface.Cooperate when installation with the balance shaft positioning surface, prevents the balance
The front and back end counterweight is rotated relative to the balance shaft when axle system operating.
Further preferred structure, the balance shaft middle position open up thrust groove, the thrust groove and are installed on cylinder body
On thrust button axial limiting.
Further preferred structure, the thrust groove include two thrust surfaces, open up semi-circular recesses on the thrust surface
Structure, the semi-circular recesses structure and thrust button limit connect.
Further preferred structure, the thrust button include bottom plate and with bottom plate support connected vertically, in the support
Between setting and balance shaft cooperation groove, open up screw hole on the bottom plate, be fixedly connected by bolt with engine cylinder body.
Further preferred structure, the balance shaft of the balance shaft system, driving gear, driven gear, rear counterweight
Deng can adjust unbalance mass, for balancing biggish past complex inertia mass.
The present invention can be well isolated from the torsion of three cylinder machine crankshafts under the premise of meeting the functional requirement of balancing inertia torque
Vibration reduces gear engagement noise.
Detailed description of the invention
Fig. 1 is the general illustration of balance shaft system of the invention；
Fig. 2 is the cut away view of balance shaft system in Fig. 1；
Fig. 3 is balance shaft schematic diagram；
Fig. 4 is the left view of balance shaft system in Fig. 1；
Fig. 5 is the exploded view of driving gear and decoupling gear in the present invention；
Fig. 6 is the rear counterweight schematic diagram of balance shaft system of the present invention；
Fig. 7 is the oil baffle schematic diagram of balance shaft system of the present invention.
Wherein, wherein 1- drives gear (11- removes repeated hole, 12- keyway, the first counterbore of 13-), 2- to decouple gear (21- tooth
Circle, 22- forward horizontal stand counterweight, 23- rubber ring, the first positioning surface of 25-, 26- through-hole, 27- wheel hub, the second counterbore of 28-, 29- support
Muscle), 3- balance shaft (31- front support axle journal, the rear end 32- support axle journal, the first threaded hole of 33-, the second threaded hole of 34-, 35-
First radial positioning face, the second radial positioning of 36- face, 37- thrust groove, the first balance weight of 38-, the second balance weight of 39-), 4- stops
(51- wet type belt pulley, 52- through-hole, 53- second are positioned for counterweight after push-plate (41- pedestal, 42- support, 43- groove), 5-
Face, 54- third threaded hole, 55- boss), 6- bearing, 8- oil baffle (81- oil baffle threaded hole).
Specific embodiment
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments, convenient for this hair is well understood
It is bright, but they limiting the invention.
As shown in Figure 1, the present invention provides a kind of variable compression ratio engine balance shaft system, including driving gear 1, with
The driven gear ring 21 of gear engagement is driven, driven gear ring becomes one with forward horizontal stand counterweight 22, forms decoupling gear 2.Decoupling
Gear 2 is connect by bolt with 3 front end of balance shaft (left side in Fig. 1).3 front and back end of balance shaft is equipped with bearing 6.In addition, described
Balance shaft system further includes rear counterweight 5, which becomes one with wet type belt pulley 51, blending bolt fastening
In balance shaft rear end (right side in Fig. 1).The wet type belt pulley 51 drives engine oil pump by belt.The decoupling gear 2
Lower section there is oil baffle 8, oil baffle 8 is mounted on engine sump tank by bolt.
As shown in Figures 2 and 3, balance shaft 3 is respectively provided with front support axle journal 31 and rear end support axle journal 32, for installing
Front and back end bearing, front and back end bearing is installed on engine cylinder body, it is possible thereby to support balance shaft system.Balance shaft front/rear end
It is respectively provided with the first threaded hole 33 and the second threaded hole 34, for fixing forward horizontal stand counterweight 22 and rear counterweight 5, when assembly is first
Balance shaft 3 is mounted on engine cylinder body, is then bolted, forward horizontal stand counterweight 22, rear counterweight 5 are fastened on
In balance shaft.3 front and back end of balance shaft is machined with the first radial positioning face 35 and the second radial positioning face 36, and balance is matched in a pre-installation
For being aligned when weighing 22, rear counterweight 5.3 middle position of balance shaft is machined with thrust groove 37, matched balance shaft
Thrust button 4 is mounted on lower cylinder body or oil sump, balance shaft play on axially and radially direction when preventing from running at high speed, thus
Improve the NVH effect of balance shaft system.
3 part of balance shaft is processed, and 180 ° of symmetrical first balance weights 38 and the second balance weight 39 are formed,
Under the premise of guaranteeing axis performance requirement, overall weight as smaller as possible and amount of unbalance.The symmetrical balance weight needs
Guarantee consistent with the direction of anterior-posterior balance counterweight 22 and 5 after installing.
Front and back end bearing 6 preferably uses rolling bearing, because the balance shaft system overall structure is compact, integral arrangement
Space is more rich, and without the independent processing and lubrication oil duct in balance shaft and cylinder body, simplifies the manufacture of balance shaft.As one kind
Embodiment, front and back bearings are all made of needle bearing.
As depicted in figs. 1 and 2, the thrust button 4 includes pedestal 41 and support 42, and pedestal 41 passes through under bolt and engine
Cylinder body or oil sump connection.The support 42 has certain interval in axially and radially direction with balance shaft thrust groove 37.Balance
When axis operates, balance shaft thrust button can provide axial two-way and radial direction thrust function.Position is located at oil sump at this
Near, without individually lubrication.
Fig. 4 indicates the driving gear 1 and decoupling gear 2 of balance shaft system, and driving 1 Central web section of gear has several
Remove repeated hole 11, and not beat duplicate removal bore region thickness with web inconsistent for duplicate removal bore region thickness.Driving inner ring gear is machined with key
Slot 12, for being connect with crankshaft.By removing repeated hole 11 and not the gear web of uniform thickness, crankshaft injustice can be adjusted most possibly
It measures.
Drive gear 1 and decoupling gear 2 that there is phase relation, phase relation causes confusion when to prevent installation, such as Fig. 4 institute
Showing in driving gear 1 and decouple the initial engagement position of gear 2, driving 1 root position of gear processes two the first counterbores 13,
It decouples 2 root position of gear and processes second counterbore 28.When installation, first driving gear 1 is mounted on crankshaft, and will balance
Axis 3 is mounted on cylinder body, then decoupling gear 2 is mounted on to the front end of balance shaft 3, guarantees the second counterbore 28 on decoupling gear 2
Between 2 the first counterbores 13 of driving gear 1, that is, it can guarantee the phase relation of entire balance shaft system and crankshaft.Phase
Relationship is most important for balance shaft system or even global vibration of engine, and engine designs initial stage, past according to engine
Multiple inertia force size, each sub- part of balance shaft is adjusted and optimizes to its counterweight size and location, so as to entirely balance shafting
The amount of unbalance of system meets engine design requirement.Once phase relation solidifies, the counterweight and amount of unbalance of each sub- part are just solid
Change, driving gear can effectively decompose the amount of unbalance of balance shaft system with the phase relation for decoupling gear setting in the present invention
Onto each sub- part, the control and cost be conducive in manufacture and assembling process is reduced.
As shown in figure 5, decoupling gear 2 include wheel hub 27, rubber ring 23 and driven gear ring 21, wheel hub 27 preferably with forward horizontal stand
Counterweight 22 is integrated in one, and therefore saves on integral installation space, supporting rib 29 is set in 27 web of wheel hub, rubber ring 23 passes through vulcanization
Technique is connected on driven gear ring 21 and the wheel hub 27 being integrated in one with forward horizontal stand counterweight, and with 3 front end of balance shaft (in Fig. 1
Left side) it is fastened by bolts.Preferably there are several spoke architectures among the inner ring and outer ring of the wheel hub, guaranteeing that transmitting is strong
Under the premise of degree requires, the weight of gear is reduced to the greatest extent.Inner ring processes the first positioning surface 25, when installation with 3 front end of balance shaft
The first radial positioning face 35 cooperation, prevent it is wrongly installed or installation after there is relative motion, form a kind of effective torque drive
Structure.Wheel hub inner ring is formed with a through-hole 26, and bolt is by the through-hole when installation, and connect with balance shaft 3.
If Fig. 6 is indicated, rear counterweight 5 is combined as a whole with wet type belt pulley 51 by press-fit approach, rear counterweight 5
Positioned at the outside (right side of balance shaft in Fig. 1) of wet type belt pulley 51,51 inner ring of wet type belt pulley is machined with the second positioning surface 53
With through-hole 52, during installation, the second radial positioning face 36 of the second positioning surface 53 and balance shaft rear end cooperates, before guaranteeing after installation
Counterweight is symmetrical at 180 ° afterwards.Counterweight 5 and 51 transition position of wet type belt pulley have one to be machined with third threaded hole 54 afterwards
Boss 55, balance shaft assembly assembly after amount of unbalance detection when, can be by changing the boss if amount of unbalance is overproof
55 54 depth of third threaded hole is adjusted, if amount of unbalance is insufficient, can by be screwed into certain mass band mass block, increase
Amount of unbalance.
As shown in fig. 7,8 surrounding of oil baffle below decoupling gear is distributed four threaded holes 81, pass through 4 bolts when installation
Oil baffle is fixed on oil sump, the oil baffle plate structure is compact, when structure can effectively prevent balance shaft system to run at high speed
Decouple the agitation of gear mesh machine oil.
The content being not described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (13)
1. a kind of uniaxiality balance axle system of variable compression ratio engine, it is characterised in that: be installed on including being located at crankshaft side
Balance shaft (3) on engine cylinder body, the balance shaft (3) are eccentric shaft structure, and balance shaft (3) front end passes through driven tooth
Wheel is drivingly connected with the driving gear (1) being located on crankshaft.
2. a kind of uniaxiality balance axle system of variable compression ratio engine according to claim 1, it is characterised in that: described
Balance shaft (3) is fixedly arranged at the front end with transmission gear and forward horizontal stand counterweight (22), and rear end is fixed with rear counterweight (5).
3. a kind of uniaxiality balance axle system of variable compression ratio engine according to claim 2, it is characterised in that: described
Driven gear is decoupling gear (2), and the decoupling gear (2) includes gear ring (21), rubber ring (23), wheel hub (27), the rubber
Cushion rubber (23) is between the gear ring (21) and the wheel hub (27)；The wheel hub (27) is integrated in forward horizontal stand counterweight (22)
One.
4. a kind of uniaxiality balance axle system of variable compression ratio engine according to claim 3, it is characterised in that: described
It drives and is equipped with aligning structure between gear (1) and decoupling gear (2).
5. a kind of uniaxiality balance axle system of variable compression ratio engine according to claim 4, it is characterised in that: described
Aligning structure include two the first counterbores (13) of driving gear (1) tooth root setting, decoupling gear (2) the tooth root setting the
Two counterbores (28), it is described decoupling gear (2) on the second counterbore (28) be located at driving gear (1) two the first counterbores (13) it
Between.
6. a kind of uniaxiality balance axle system of variable compression ratio engine according to claim 2, it is characterised in that: described
Forward horizontal stand counterweight (22) is semicircle shape structure.
7. a kind of uniaxiality balance axle system of variable compression ratio engine according to claim 3, it is characterised in that: described
It decouples and is equipped with oil baffle (8) below gear (2), the oil baffle (8) passes through the bolt fastening being disposed around on oil sump.
8. a kind of uniaxiality balance axle system of variable compression ratio engine according to claim 2, it is characterised in that: described
Counterweight (5) is integrated in one with wet type belt pulley (51) afterwards, and rear counterweight (5) inside has and the wet type skin
The wheel hub of belt wheel (51) gear ring cooperation, wet type belt pulley (51) gear ring are pressed on the rear counterweight wheel hub.
9. a kind of uniaxiality balance axle system of variable compression ratio engine according to claim 8, it is characterised in that: described
Counterweight (5) is equipped with the boss (55) with third threaded hole (54) afterwards.
10. a kind of uniaxiality balance axle system of variable compression ratio engine according to claim 2, it is characterised in that: institute
It states forward horizontal stand counterweight (22) and rear counterweight (5) wheel hub inner ring is equipped with for cooperating first with the balance shaft (3) positioning surface
Positioning surface (25) and the second positioning surface (53).
11. a kind of uniaxiality balance axle system of variable compression ratio engine according to claim 1, it is characterised in that: institute
It states balance shaft (3) middle position to open up thrust groove (37), the thrust groove (37) and the thrust button (4) being installed on cylinder body are axial
Limit.
12. a kind of uniaxiality balance axle system of variable compression ratio engine according to claim 11, it is characterised in that: institute
Stating thrust groove (37) includes two thrust surfaces, opens up semi-circular recesses structure, the semi-circular recesses structure on the thrust surface
It limits and connects with the thrust button (4).
13. a kind of uniaxiality balance axle system of variable compression ratio engine according to claim 11, it is characterised in that: institute
State thrust button (4) include bottom plate (41) and with bottom plate (41) support connected vertically (42), among the support (42) setting with
The groove (43) of balance shaft cooperation, opens up screw hole on the bottom plate (41), is fixedly connected by bolt with engine cylinder body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811148868.0A CN109340306A (en) | 2018-09-29 | 2018-09-29 | A kind of uniaxiality balance axle system of variable compression ratio engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811148868.0A CN109340306A (en) | 2018-09-29 | 2018-09-29 | A kind of uniaxiality balance axle system of variable compression ratio engine |
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| Publication Number | Publication Date |
|---|---|
| CN109340306A true CN109340306A (en) | 2019-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811148868.0A Pending CN109340306A (en) | 2018-09-29 | 2018-09-29 | A kind of uniaxiality balance axle system of variable compression ratio engine |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102338150A (en) * | 2011-10-16 | 2012-02-01 | 中国兵器工业集团第七○研究所 | Balance shaft |
| CN102996707A (en) * | 2012-11-01 | 2013-03-27 | 奇瑞汽车股份有限公司 | Engine balance shaft system |
| CN203214762U (en) * | 2013-01-31 | 2013-09-25 | 浙江吉利汽车研究院有限公司杭州分公司 | Balance shaft mechanism of three-cylinder engine |
| CN205806326U (en) * | 2016-06-29 | 2016-12-14 | 神龙汽车有限公司 | A kind of balance shaft apparatus of Novel belt vibration-reduction gear |
| CN207554192U (en) * | 2017-11-20 | 2018-06-29 | 东风汽车公司 | A kind of lockable engine crankshaft and cylinder body and its locking structure |
| CN108397514A (en) * | 2018-02-08 | 2018-08-14 | 奇瑞汽车股份有限公司 | Three-cylinder engine balance shaft |
-
2018
- 2018-09-29 CN CN201811148868.0A patent/CN109340306A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102338150A (en) * | 2011-10-16 | 2012-02-01 | 中国兵器工业集团第七○研究所 | Balance shaft |
| CN102996707A (en) * | 2012-11-01 | 2013-03-27 | 奇瑞汽车股份有限公司 | Engine balance shaft system |
| CN203214762U (en) * | 2013-01-31 | 2013-09-25 | 浙江吉利汽车研究院有限公司杭州分公司 | Balance shaft mechanism of three-cylinder engine |
| CN205806326U (en) * | 2016-06-29 | 2016-12-14 | 神龙汽车有限公司 | A kind of balance shaft apparatus of Novel belt vibration-reduction gear |
| CN207554192U (en) * | 2017-11-20 | 2018-06-29 | 东风汽车公司 | A kind of lockable engine crankshaft and cylinder body and its locking structure |
| CN108397514A (en) * | 2018-02-08 | 2018-08-14 | 奇瑞汽车股份有限公司 | Three-cylinder engine balance shaft |
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Application publication date: 20190215 |