CN105626774A - Shafting frequency modulator and engine - Google Patents

Abstract

The invention relates to the technical field of engines, in particular to a shafting frequency modulator and an engine. The shafting frequency modulator comprises a housing, an inertial ring, a location pin, an elastic part and a cover plate, wherein the housing is mounted at the front end of a crankshaft; one side of the housing is provided with a ring-shaped mounting slot for accommodating the inertial ring; the inertial ring is arranged in the ring-shaped mounting slot, and is capable of generating relative sliding along the ring-shaped mounting slot; one end of the location pin is connected to the outer side of the inertial ring through the elastic part; a pin hole for allowing the location pin to insert is formed in the inner wall of the ring-shaped mounting slot; and the cover plate is encapsulated above the ring-shaped mounting slot. The shafting frequency modulator can enable the engine to have relatively high shafting frequency during working at a relatively low rotation speed, and to have relatively low shafting frequency during working at a relatively high rotation speed, so that a resonant rotation speed is avoided, and therefore, torsion vibration of the engine is at relatively low level, and the purpose of reducing the shafting torsion vibration is realized.

Description

A kind of axle system frequency modulator and electromotor

Technical field

The present invention relates to technical field of engines, particularly relate to a kind of axle system frequency modulator and electromotor.

Background technology

At present, bent axle is as one of moving component main in internal combustion engine, its intensity and reliability decide the reliability of internal combustion engine to a great extent, it can produce torsional oscillation in running, and in resonance state, torsional oscillation shearing force is big especially, and when exceeding the stress that axle system can bear, axle system will rupture. Generally use vibroshock at present and reduce shafting torsional oscillation. But, this structure fabrication processes is complicated, and cost is high, but also there is vibroshock silicone oil or ageing of rubber problem, and functional reliability is poor.

Summary of the invention

(1) to solve the technical problem that

The technical problem to be solved in the present invention is to solve axle system to mate the vibroshock problem to reduce torsional oscillation.

(2) technical scheme

In order to solve above-mentioned technical problem, the invention provides a kind of axle system frequency modulator, it includes shell, inertia rings, alignment pin, elastomeric element and cover plate; Described shell is installed on the front end of bent axle, and offers the annular mounting groove holding described inertia rings in the side of described shell; Described inertia rings is arranged in described annular mounting groove, and can along described annular mounting groove generation relative sliding; One end of described alignment pin is connected with the outside of described inertia rings by elastomeric element, and the inwall of described annular mounting groove offers the pin-and-hole inserted for described alignment pin, and described cover plate is packaged in the top of described annular mounting groove.

Wherein, the quantity of described alignment pin is multiple, and multiple described alignment pin is symmetrical in described inertia rings.

Wherein, the outside symmetry of described inertia rings offers multiple radial direction draw-in groove, and one end of described alignment pin is connected with the bottom of described radial direction draw-in groove by elastomeric element.

Wherein, described radial direction draw-in groove includes the first groove and the second groove, and described first groove is used for holding described alignment pin, and described second groove is used for holding described elastomeric element, and the diameter of described second groove is less than the diameter of described first groove.

Wherein, described alignment pin be shaped as tabular.

Wherein, described shell is provided with annular mounting groove in outer peripheral one week along it, and described inertia rings is the circular ring structure matched with described annular mounting groove.

Wherein, the center of described shell is provided with the installing hole for installing described bent axle.

Wherein, it is filled with lubricant medium between described inertia rings and shell and cover plate.

Wherein, described elastomeric element is spring.

The present invention also provides for a kind of electromotor, and it includes axle system as claimed in any one of claims 1-9 wherein frequency modulator.

(3) beneficial effect

The technique scheme of the present invention has the advantages that

1), this axle system frequency modulator is by adjusting axle system inertia, make electromotor axle system frequency when relatively low rotary speed working higher, and axle system frequency is relatively low when high rotary speed working, avoids resonance speed, electromotor torsional oscillation is made to be in reduced levels, it is achieved to reduce the purpose of shafting torsional oscillation.

2), this axle system frequency modulator simple in construction, processing technology is uncomplicated, and inertia rings and housing requirement on machining accuracy are relatively low, and cost is low.

3), this axle system frequency modulator does not have vibroshock silicone oil or ageing of rubber problem, reliable operation, long service life.

Accompanying drawing explanation

Fig. 1 is the structural representation of the embodiment of the present invention one axle system frequency modulator;

Fig. 2 is the sectional view of the embodiment of the present invention one axle system frequency modulator;

Fig. 3 is the embodiment of the present invention one axle system model sketch.

Wherein, 1: shell; 2: inertia rings; 3: alignment pin; 4: elastomeric element; 5: cover plate.

Detailed description of the invention

Below in conjunction with drawings and Examples, embodiments of the present invention are described in further detail. Following example are used for illustrating the present invention, but can not be used for limiting the scope of the present invention.

In describing the invention, it is necessary to explanation, except as otherwise noted, " multiple " are meant that two or more; Term " on ", D score, "left", "right", " interior ", " outward ", " front end ", " rear end ", " head ", the orientation of the instruction such as " afterbody " or position relationship be based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than instruction or hint indication device or element must have specific orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention. Additionally, term " first ", " second ", " the 3rd " etc. are only for descriptive purposes, and it is not intended that indicate or hint relative importance.

In describing the invention, in addition it is also necessary to explanation, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, for instance, it is possible to it is fixing connection, it is also possible to be removably connect, or connect integratedly; Can be mechanically connected, it is also possible to be electrical connection; Can be joined directly together, it is also possible to be indirectly connected to by intermediary. For the ordinary skill in the art, visual concrete condition understands above-mentioned term concrete meaning in the present invention.

Embodiment one

As shown in Figure 1-2, the axle system frequency modulator that the present embodiment provides, it includes shell 1, inertia rings 2, alignment pin 3, elastomeric element 4 and cover plate 5; Shell 1 is installed on the front end of bent axle, and offers the annular mounting groove holding inertia rings 2 in the side of shell 1; Specifically, the center of shell 1 is provided with the installing hole for installing bent axle. Inertia rings 2 is arranged in annular mounting groove, and can annularly mounting groove generation relative sliding; One end of alignment pin 3 is connected with the outside of inertia rings 2 by elastomeric element 4, and the inwall of annular mounting groove offers the pin-and-hole inserted for alignment pin 3, and cover plate 5 is packaged in the top of annular mounting groove. This axle system frequency modulator can substitute vibroshock vibration damping, make electromotor axle system frequency when relatively low rotary speed working higher, resonance occurs at high rotating speed, and when electromotor is when high rotary speed working, axle system frequency is relatively low, resonance occurs in the slow-speed of revolution, avoids resonance by adjustment axle system frequency and makes electromotor torsional oscillation be in reduced levels.

Preferably, the quantity of alignment pin 3 is multiple, and multiple alignment pin 3 is symmetrical in inertia rings 2.

Accordingly, shell 1 is provided with annular mounting groove in outer peripheral one week along it, and inertia rings 2 is the circular ring structure matched with annular mounting groove. The outside symmetry of inertia rings 2 offers multiple radial direction draw-in groove, and one end of alignment pin 3 is connected by the bottom of elastomeric element 4 with radially draw-in groove, and the other end of alignment pin 3 can stretch out radial direction draw-in groove and contact with the inwall tensioning of annular mounting groove.

Preferably, elastomeric element 4 is spring.

Wherein, radially draw-in groove includes the first groove and the second groove, and the first groove is used for holding alignment pin 3, and the second groove is used for holding elastomeric element 4, and the diameter of the second groove is less than the diameter of the first groove.

Shape for alignment pin 3 is not limited to, it is preferable that be shaped as tabular.

It is filled with lubricant medium between inertia rings 2 and shell 1 and cover plate 5.

The operation principle of the axle system frequency modulator that the present embodiment provides is:

Engine shaft system is without vibroshock state, it is possible to become the model simplification of electromotor and outer spindle system as it is shown on figure 3, the inertia that I is engine shaft system (includes bent axle, piston, connecting rod etc., do not include flywheel), K is the rigidity of axle system, and C is the damping of axle system, F=F₀Cos (�� t) is dynamic excitation.

Then the forced vibration with damp differential equation of single-degree-of-freedom is:

$\stackrel{\·\·}{x}\left(t\right)+2{\mathrm{\ξ\ω}}_n\stackrel{\·}{x}\left(t\right)+{\mathrm{\ω}}_n^{2}x\left(t\right)={\mathrm{\ω}}_n^{2}Acos\mathrm{\ω}t---\left(1\right)$

Wherein A=F₀/ k, its value is equal to the power Static Correction that system produces in single-mode system applying exciting force amplitude size. X (t) is the angular displacement of equivalent inertia body,For system frequency, �� is dynamic excitation frequency, ��=c/ (2m ��_n) for the damping ratio of single-freedom vibration system.

Solve the above-mentioned differential equation and obtain single-mode system forced vibration response amplitude:

$X=\frac{A}{\sqrt{{(1-\frac{{\mathrm{\ω}}^2}{{\mathrm{\ω}}_n^2})}^2+{\left(2\mathrm{\ξ}\frac{\mathrm{\ω}}{{\mathrm{\ω}}_n}\right)}^2}}---\left(2\right)$

By formula (2) it can be seen that vibrate very big when the driving frequency of vibrational system is near natural frequency, and vibration is corresponding less under other frequency. Such as system incentive frequency is 90Hz, and when system frequency is 90Hz, system resonance, vibration amplitude is very big, and when being 75Hz by natural frequency, the vibration under driving frequency 90Hz is greatly reduced.

With certain 6 Cylinder engine torsional vibration characteristic curve without vibroshock it can be seen that the speed driving frequency that means more greatly electromotor is more high, vertical coordinate is torsional oscillation amplitude. 6 rank are its master drive orders, produce resonance at 1661r/min, if this bent axle is when more than 1550r/min, make natural frequency of shafting step-down, 6 rank resonance are adjusted to below 1400r/min, then the range of speeds of more than 1550r/min is away from resonance region, and torsional oscillation amplitude can be very low.

When electromotor runs in the relatively slow-speed of revolution, alignment pin 3 is by spring straining in inertia rings 2, and inertia rings 2 is rotated by shell 1 by frictional force, and inertia rings 2 has certain speed discrepancy with shell 1. When electromotor is increased to certain rotating speed, the centrifugal force of alignment pin 3 overcomes spring tension, stretch out inertia rings 2 to withstand shell 1 and slide, when alignment pin 3 goes to the pin-and-hole on shell 1, namely insert, now inertia rings 2 rotating speed increases consistent with shell 1 rotating speed, the centrifugal force of pin increases further, is seated in pin-and-hole, and such inertia rings 2 inertia is attached to axle completely and fastens, realizing axle system inertia to increase, natural frequency declines. Same, when rotating speed reduces, centrifugal force reduces, and pin is retraction inertia rings 2 under spring tension effect, and inertia rings 2 and shell 1 unclamp, and axle system inertia diminishes, and natural frequency of shafting raises, and resonance speed raises away from working speed.

In summary:

1), this axle system frequency modulator is by adjusting axle system inertia, make electromotor axle system frequency when relatively low rotary speed working higher, and axle system frequency is relatively low when high rotary speed working, avoids resonance speed, electromotor torsional oscillation is made to be in reduced levels, it is achieved to reduce the purpose of shafting torsional oscillation.

2), this axle system frequency modulator simple in construction, processing technology is uncomplicated, and inertia rings 2 is relatively low with housing requirement on machining accuracy, and cost is low.

3), this axle system frequency modulator does not have vibroshock silicone oil or ageing of rubber problem, reliable operation, long service life.

Embodiment two

The present embodiment two also provides for a kind of electromotor, and it includes axle system frequency modulator. This axle system frequency modulator includes shell 1, inertia rings 2, alignment pin 3, elastomeric element 4 and cover plate 5; Shell 1 is installed on the front end of bent axle, and offers the annular mounting groove holding inertia rings 2 in the side of shell 1; Specifically, the center of shell 1 is provided with the installing hole for installing bent axle. Inertia rings 2 is arranged in annular mounting groove, and can annularly mounting groove generation relative sliding; One end of alignment pin 3 is connected with the outside of inertia rings 2 by elastomeric element 4, and the inwall of annular mounting groove offers the pin-and-hole inserted for alignment pin 3, and cover plate 5 is packaged in the top of annular mounting groove. Repeat no more as other features, detailed in Example one.

Embodiments of the invention provide for example with for the purpose of describing, and are not exhaustively or limit the invention to disclosed form. Many modifications and variations are apparent from for the ordinary skill in the art. Selecting and describing embodiment is in order to principles of the invention and practical application are better described, and makes those of ordinary skill in the art it will be appreciated that the present invention is thus design is suitable to the various embodiments with various amendments of special-purpose.

Claims (10)

1. an axle system frequency modulator, it is characterised in that include shell, inertia rings, alignment pin, elastomeric element and cover plate; Described shell is installed on the front end of bent axle, and offers the annular mounting groove holding described inertia rings in the side of described shell; Described inertia rings is arranged in described annular mounting groove, and can along described annular mounting groove generation relative sliding; One end of described alignment pin is connected with the outside of described inertia rings by elastomeric element, and the inwall of described annular mounting groove offers the pin-and-hole inserted for described alignment pin, and described cover plate is packaged in the top of described annular mounting groove.

2. axle system according to claim 1 frequency modulator, it is characterised in that the quantity of described alignment pin is multiple, and multiple described alignment pin is symmetrical in described inertia rings.

3. axle system according to claim 1 frequency modulator, it is characterised in that the outside symmetry of described inertia rings offers multiple radial direction draw-in groove, one end of described alignment pin is connected with the bottom of described radial direction draw-in groove by elastomeric element.

4. axle system according to claim 3 frequency modulator, it is characterized in that, described radial direction draw-in groove includes the first groove and the second groove, and described first groove is used for holding described alignment pin, described second groove is used for holding described elastomeric element, and the diameter of described second groove is less than the diameter of described first groove.

5. axle system according to claim 1 frequency modulator, it is characterised in that described alignment pin be shaped as tabular.

6. axle system according to claim 1 frequency modulator, it is characterised in that described shell is provided with annular mounting groove in outer peripheral a week along it, described inertia rings is the circular ring structure matched with described annular mounting groove.

7. axle system according to claim 1 frequency modulator, it is characterised in that the center of described shell is provided with the installing hole for installing described bent axle.

8. axle system according to claim 1 frequency modulator, it is characterised in that be filled with lubricant medium between described inertia rings and shell and cover plate.

9. axle system according to claim 1 frequency modulator, it is characterised in that described elastomeric element is spring.

10. an electromotor, it is characterised in that include axle system as claimed in any one of claims 1-9 wherein frequency modulator.