CN203979307U - Novel inertia element apparatus for automotive suspension - Google Patents

Novel inertia element apparatus for automotive suspension Download PDF

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Publication number
CN203979307U
CN203979307U CN201420456163.6U CN201420456163U CN203979307U CN 203979307 U CN203979307 U CN 203979307U CN 201420456163 U CN201420456163 U CN 201420456163U CN 203979307 U CN203979307 U CN 203979307U
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nut
ball
bearing
screw
chamber enclosure
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胡悦
李卫民
潘云龙
王进
徐回
相臣
张海宁
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Jining Zhongke Advanced Technology Institute Co Ltd
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Jining Zhongke Advanced Technology Institute Co Ltd
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Abstract

The utility model relates to a kind of case of being used to, be specifically related to a kind of novel inertia element apparatus for automotive suspension, comprise leading screw, leading screw two ends are made as smooth structure, intermediate portion arranges screw thread raceway, end, leading screw one end arranges hanger A, it is inner that threads of lead screw raceway partly stretches into stroke chamber enclosure, stroke chamber enclosure one end end face is end cap fixedly, the other end end face arranges hanger B, the interior fixedly ball screw pair of stroke chamber enclosure, ball screw pair comprises screw thread raceway, nut A, nut shim and nut B, between nut A and nut B and screw thread raceway, ball is set, nut shim is arranged between nut A and nut B, bearing A, B is separately positioned on nut A, B periphery, and contact with stroke chamber enclosure inwall, end cap central through bore, fixedly flywheel of this through hole is passed in nut A one end.The utility model kinetic friction force is little, adopts ball screw pair, and by pretension, compensates the gap of ball screw pair, eliminates phase place hysteresis, impact and noise problem.

Description

Novel inertia element apparatus for automotive suspension
Technical field
The utility model relates to a kind of case of being used to, and is specifically related to a kind of novel inertia element apparatus for automotive suspension.
Background technique
In the process driving a car, automobile ride and control stability are two very crucial performances that give driver and passenger's direct feeling, and suspension is having a deep effect on smoothness and the control stability of automobile as one of the core component on chassis.The development of suspension technology is at present comparative maturity, but still has some problems.
Traditional suspension is mainly passive suspension, varied although the structural type of various suspensions has, and damping element, elastic element and guide mechanism are three chief components of suspension.This traditional suspension is reliable, has fixing spring rate and vibration damper damping, but this kind of suspension automobile ride and control stability are conflicts, and design object suspension need to be traded off to this contradiction, so suspension overall performance is limited.Along with the development of the technology such as electronics and control, occurred passing through sensor senses traveling state of vehicle, control the spring element of adjustable rigidity and damping member to improve the semi-active suspension of suspension property; And in suspension, add again actuator, can realize the Active suspension of more suspension property regulation and control.Because Active suspension is with high costs, complex structure, reliability is not as passive suspension, and the realization link of controlling is too much, cause the actual effect of controlled suspension usually to have undesirable situation, therefore do not occur the situation of active preferably or semi-active suspension large-scale application vehicle always.
Calendar year 2001 Smith model utility inertia unit (Inerter) mechanical device, the dynamic characteristic of this element corresponding similar with electric network in capacity cell, similar in appearance to resistive element and damping member correspondence similar in appearance to inductance element, jointly realized the complete similar corresponding of mechanical network and electric network with spring element correspondence.Therefore being added to traditional " spring-damping " suspension system, this inertia unit element forms novel " inertia unit-spring-damping (Inerter; Spring; Damper---ISD) " suspension system, can make full use of the mature electric network technology of industry, expanded the development space of suspension technology, new " inertia unit-spring-damping " structure has realized the innovation on suspension frame structure, these three kinds of element structures can diversification of forms, for research improves suspension anti-vibration performance, has opened up wide space.
Inertia unit is mainly divided into translational type and rotary type two classes at present, and commonly using translational type inertia unit has 4 types: pinion and-rack inertia unit, ball screw type inertia unit, lever quality formula inertia unit and hydraulic pressure hydraulic type inertia unit.In automotive suspension vibration isolation field, actual inertia unit's characteristic and desirable inertia unit's characteristic degree of closeness aspect, pinion and-rack inertia unit belongs to first generation inertia unit.The advantage of this inertia unit is, structure is easy to design, and bearing capacity is also larger; Its shortcoming is that the bigger than normal and between cog of the frictional force of meshed transmission gear exists gap, so there will be the hysteresis phenomenons such as hysteresis of phase place during pinion and-rack inertia unit high-speed motion, also has impact in gear drive power and noise excessive.If by turning to reduce inter-lobe clearance down with the centre distance of tooth bar between gear, can further increase the frictional force of between cog transmission.
At present, the second generation inertia unit technology of better performances is ball screw type inertia unit, application number is that 2010240715.X Chinese patent discloses the emulation mode that a kind of ball screw type is used to container mechanical property, but the current domestic patent that also there is no ball screw type inertia meta structure aspect.
Model utility content
For overcoming the deficiency in above-mentioned technology, the purpose of this utility model is: a kind of novel inertia element apparatus for automotive suspension is provided, and kinetic friction force is little, adopts ball screw pair, and compensate ball screw auxiliary air gap by pre-pressing structure, eliminate phase place hysteresis, impact and noise problem.
For solving the problems of the technologies described above, the technological scheme that the utility model adopts is:
The described novel inertia element apparatus for automotive suspension, comprise hanger, leading screw, flywheel, end cap, ball screw pair and stroke chamber enclosure, leading screw two ends are made as smooth structure, intermediate portion arranges screw thread raceway, end, leading screw one end arranges hanger A, it is inner that threads of lead screw raceway partly stretches into stroke chamber enclosure, stroke chamber enclosure one end is cylindrical shape, its end face is end cap fixedly, the other end is made as cone barrel type, its end face arranges hanger B, hanger B and stroke chamber enclosure are structure as a whole, stroke chamber enclosure is made as columnar partial fixing ball screw pair, ball screw pair comprises screw thread raceway, nut A, nut shim and nut B, between nut A and nut B and screw thread raceway, ball is set, nut shim is arranged between nut A and nut B, bearing A and bearing B are separately positioned on nut A and nut B periphery, contact with stroke chamber enclosure inwall, end cap center is provided with the through hole identical with nut A external diameter, fixedly flywheel of end cap is passed in nut A one end, flywheel is arranged on leading screw simultaneously.
The utility model essence is that a kind of ball screw type inertia is first, specifically, is that a kind of lead screw straight-line drives feed screw nut rotation, and then the ball screw type inertia unit of flywheel driven rotation.When acting on the large reverse directed force F such as hanger A and hanger B two ends, A, 2 of B produce relative straight line motions, so the straight line motion of leading screw can drive nut A, B rotation, thereby have driven the flywheel rotation being arranged on nut A.Flywheel is arranged on outside end cap, and its shape and quality just can not be subject to the spatial constraints of flywheel chamber in conventional construction, and design comparison is flexible, in addition, gyrating mass except flywheel is comprised of nut and bearing inner race two-part, less with respect to leading screw gyrating mass, more approaches desirable inertia element apparatus.
Do not considering that except flywheel, under the quality of moving element and the friction condition of lead screw pair, desirable inertia element apparatus, has following dynamics formula
f = b d ( υ 2 - υ 1 ) dt
In formula, f is the reverse power of equivalence that acts on two-end-point, υ 1and υ 2for the speed of two-end-point, b is inertial coefficient, and unit is kg.
Ball screw type inertia unit inertial coefficient formula is:
b = m w ( π · r w P ) 2
Wherein, m wfor flywheel mass, r wfor flywheel radius and P are ball screw pair pitch, for realizing optimum design, three determines the overall condition that need to consider inertia unit.
The work loads that ball screw subtask bears can make generation gap, lead screw pair contact area, and the error of installing in addition and manufacturing also can produce gap.Inertia unit need to move reciprocatingly, and in order to improve the transmission accuracy of lead screw pair and to reduce impact noise and impact force, need to take certain measure to eliminate gap.Because nut installation dimension is less in the utility model, for manufacture and easy for installation, select double nut pad pre-pressing structure, by put the pad of different-thickness between two nuts, make pad left and right nut compacted, reach the disappear effect of gap of pretension, its pretightening force is easy to adjust, and pretightening force is reliable and stable.
Stroke chamber enclosure is set to one section of cone barrel type for headspace, and its effect is, when the utility model is outside equilibrium position, while also needing to bear static load and dynamic load, can guarantee that leading screw has enough spaces.
The transmission working principle of ball screw pair is exactly to utilize the rolling of ball in spiral rolling track to realize the motion of leading screw and the relative rolling friction of nut.At certain ball number now in order to guarantee that ball can work continuously in raceway, make ball when moving to raceway terminal, can turn back to raceway starting point repeated work, need in nut part, process ball return passage or install ball-recirculation parts additional.According to the situation that contacts on ball and leading screw surface, be divided into circulation and two kinds of devices of outer circulation in ball.The precision such as in the utility model the main demand of ball screw pair is middle and high and middle or small helical pitch, require the nut installation dimension can not be excessive, and manufacturing process is relatively simple, so, preferred inner circulation type ball screw pair.In leading screw operation process, ball never departs from threads of lead screw raceway, because reverse distance is shorter and ball number is few, makes motion smooth, and not easy to wear, the efficiency of transmission is high.
Described bearing A and bearing B are angular contact ball bearing, both adopt face-to-face duplex in pairs to arrange, for meeting ball screw adjutant straight line motion, be converted to the demand rotatablely moving, bearing need to bear thrust load and radial load simultaneously, therefore, select the angular contact ball bearing that bearing A and bearing B are same size, adopt face-to-face duplex in pairs to arrange.According to Machine Design standard, because single-row angular contact ball bearing can only bear one direction thrust load, therefore, bearing adopts paired mounting.The wrapping angle of bearing steel ball and inner ring, outer ring has 15 °, 25 °, 40 °, and its wrapping angle is larger, and the strength of thrust load is just larger.Wrapping angle is less, is conducive to High Rotation Speed, therefore adopts the wrapping angle of 15 ° to meet the demands.
Compared with prior art, the utlity model has following beneficial effect:
The utility model adopts ball screw pair, and eliminate gap, lead screw pair contact area by double nut pad pre-pressing structure, pretightening force is easy to adjust, pretightening force is reliable and stable, from root, eliminating pinion and-rack inertia unit phase place lags behind, impact and noise problem, straight line motion by leading screw drives the nut on leading screw to rotate, and then flywheel driven rotation, flywheel is arranged on outside end cap, its shape and quality just can not be subject to the spatial constraints of flywheel chamber in conventional construction, design comparison is flexible, in addition, gyrating mass except flywheel is comprised of nut and bearing inner race two-part, less with respect to leading screw gyrating mass, more approach desirable inertia element apparatus.Ball screw pair adopts inner circulation type, and in leading screw operation process, ball never departs from threads of lead screw raceway, because reverse distance is shorter and ball number is few, makes motion smooth, and not easy to wear, transmission efficiency is high; For meeting ball screw adjutant straight line motion, be converted to the demand rotatablely moving, bearing need to bear thrust load and radial load simultaneously, bearing A and bearing B adopt the angular contact ball bearing that duplex is arranged in pairs face-to-face, and 15 ° of wrapping angles, are conducive to High Rotation Speed bearing High Rotation Speed.
Accompanying drawing explanation
Fig. 1 the utility model structure broken away view.
Fig. 2 the utility model assembly front view.
New suspension frame structure schematic diagram described in Fig. 3 embodiment 2.
The front tyre dynamic load frequency response characteristic of Fig. 4 half suspension Matlab model.
The vehicle body barycenter normal acceleration frequency response characteristic of Fig. 5 half suspension Matlab model.
In figure: 1, hanger A; 2, leading screw; 3, flywheel; 4, end cap; 5, bearing A; 6, nut A; 7, nut shim; 8, nut B; 9, bearing B; 10, stroke chamber enclosure; 11, hanger B; 12, stroke chamber; 13, screw thread raceway; 14, spring; 15, inertia unit; 16, damping.
Embodiment
Tying accompanying drawing explanation is below described further the utility model embodiment:
As shown in Figure 1, novel inertia element apparatus for automotive suspension described in the utility model, comprise hanger, leading screw 2, flywheel 3, end cap 4, ball screw pair and stroke chamber enclosure 10, leading screw 2 two ends are made as smooth structure, intermediate portion arranges screw thread raceway 13, leading screw 2 ends, one end arrange hanger A1, leading screw 2 screw thread raceways partly stretch into stroke chamber enclosure 10 inside, stroke chamber enclosure 10 one end are cylindrical shape, its end face is end cap 4 fixedly, the other end is made as cone barrel type, its end face arranges hanger B11, hanger B11 and stroke chamber enclosure 10 are structure as a whole, stroke chamber enclosure 10 is made as columnar partial fixing ball screw pair, ball screw pair comprises screw thread raceway, nut A, nut shim and nut B, between nut A and nut B and screw thread raceway 13, ball is set, nut shim 7 is arranged between nut A6 and nut B8, bearing A5 and bearing B9 are separately positioned on nut A6 and nut B8 periphery, contact with stroke chamber enclosure 10 inwalls, end cap 4 centers are provided with the through hole identical with nut A6 external diameter, fixedly flywheel 3 of end cap 4 is passed in nut A6 one end, flywheel 3 is arranged on leading screw 2 simultaneously.
The utility model essence is that a kind of ball screw type inertia is first, specifically, is that a kind of leading screw 2 straight line motions drive feed screw nuts rotation, and then the ball screw type inertia unit of flywheel driven 3 rotations.When acting on the large reverse directed force F such as hanger A1 and hanger B11 two ends, A, 2 of B produce relative straight line motions, so the straight line motion of leading screw 2 can drive nut A6, nut B8 rotation, thereby have driven flywheel 3 rotations that are arranged on nut A6.Flywheel 3 is arranged on outside end cap 4, and its shape and quality just can not be subject to the spatial constraints of flywheel chamber in conventional construction, and design comparison is flexible, in addition, gyrating mass except flywheel 3 is comprised of nut and bearing inner race two-part, less with respect to leading screw 2 gyrating masses, more approaches desirable inertia element apparatus.
Do not considering that except flywheel 3, under the quality of moving element and the friction condition of lead screw pair, desirable inertia element apparatus, has following dynamics formula
f = b d ( υ 2 - υ 1 ) dt
In formula, f is the reverse power of equivalence that acts on two-end-point, υ 1and υ 2for the speed of two-end-point, b is inertial coefficient, and unit is kg.
Ball screw type inertia unit inertial coefficient formula is:
b = m w ( π · r w P ) 2
Wherein, m wfor flywheel 3 quality, r wfor flywheel 3 radiuses and P are ball screw pair pitch, for realizing optimum design, three determines the overall condition that need to consider inertia unit.
The work loads that ball screw subtask bears can make generation gap, lead screw pair contact area, and the error of installing in addition and manufacturing also can produce gap.Inertia unit need to move reciprocatingly, and in order to improve the transmission accuracy of lead screw pair and to reduce impact noise and impact force, need to take certain measure to eliminate gap.Because nut installation dimension is less in the utility model, for manufacture and easy for installation, select double nut pad pre-pressing structure, by put the nut shim 7 of different-thickness between nut A6 and nut B8, make nut A and the nut B of nut shim 7 left and right sides compacted, reach the disappear effect of gap of pretension, its pretightening force is easy to adjust, and pretightening force is reliable and stable.
Stroke chamber enclosure 10 is set to one section of cone barrel type for headspace, and its effect is, when the utility model is outside equilibrium position, while also needing to bear static load and dynamic load, can guarantee that leading screw 2 has enough spaces.According to half vehicle model, carry out the simulation result of road excitation, the range that can obtain inertia element apparatus is 48.9mm, being multiplied by fixing safety coefficient n, be 2, in the present embodiment, stroke chamber 11 headspace length are 97.8mm, stroke chamber enclosure 10 is long is 190mm, stroke chamber enclosure length=hanger B length+stroke chamber headspace length+nut A length+nut B length+pad length.
The transmission working principle of ball screw pair is exactly to utilize the rolling of ball in spiral rolling track to realize the motion of leading screw and the relative rolling friction of nut.At certain ball number now in order to guarantee that ball can work continuously in raceway, make ball when moving to raceway terminal, can turn back to raceway starting point repeated work, need in nut part, process ball return passage or install ball-recirculation parts additional.According to the situation that contacts on ball and leading screw surface, be divided into circulation and two kinds of devices of outer circulation in ball.The precision such as in the utility model the main demand of ball screw pair is middle and high and middle or small helical pitch, require the nut installation dimension can not be excessive, and manufacturing process is relatively simple, so select inner circulation type ball screw pair.In leading screw 2 operation process, ball never departs from threads of lead screw raceway, because reverse distance is shorter and ball number is few, makes motion smooth, and not easy to wear, the efficiency of transmission is high.Table 1 is each design parameter value of ball screw pair.
Table 1
Described bearing A6 and bearing B8 are angular contact ball bearing, both adopt face-to-face duplex in pairs to arrange, for meeting ball screw adjutant straight line motion, be converted to the demand rotatablely moving, bearing need to bear thrust load and radial load simultaneously, therefore, select the angular contact ball bearing that bearing A6 and bearing B8 are same size, adopt face-to-face duplex in pairs to arrange.According to Machine Design standard, because single-row angular contact ball bearing can only bear one direction thrust load, therefore, bearing adopts paired mounting.The wrapping angle of bearing steel ball and inner ring, outer ring has 15 °, 25 °, 40 °, and its wrapping angle is larger, and the strength of thrust load is just larger.Wrapping angle is less, is conducive to High Rotation Speed, therefore adopts the wrapping angle of 15 ° to meet the demands, and according to the performance requirement of inertia element apparatus and bearing process industry standard, this bearing size is designed to: inner diameter d is 35mm, and outer diameter D is 62mm, and wide B is mm.
Embodiment 2:
The novel inertia element apparatus for automotive suspension described in embodiment 1 is added to traditional " spring-damping " suspension, obtain new " inertia unit-spring-damping " suspension frame structure, as shown in Figure 3, the parallel-connection structure of serial spring 14 and damping 16 again after inertia unit 15, spring 14 and the direct parallel connection of damping 16 three, why so design, be because the conventional suspension systems that spring and damping form can play the effect of filtering dither, and spring, inertia unit and damping three's system can be filled into low-frequency vibration; Therefore two systems are connected again, just can play and not only isolate low-frequency vibration but also isolate the effect of dither, have improved travelling comfort and the control stability of automobile.The dynamic characteristic of new suspension frame structure draws through the emulation of Matlab with after calculating, this new suspension frame structure is for the Frequency Response of road surface input, the evaluation index vehicle body vertical acceleration response of its car comfort and the evaluation index dynamic wheel load of automobile running handling stability are all obviously better than traditional suspension, can improve generally travelling comfort and the control stability of traditional suspension, as shown in Figure 4 and Figure 5.

Claims (4)

1. the novel inertia element apparatus for automotive suspension, it is characterized in that, comprise hanger, leading screw (2), flywheel (3), end cap (4), ball screw pair and stroke chamber enclosure (10), leading screw (2) two ends are made as smooth structure, intermediate portion arranges screw thread raceway (13), leading screw (2) end, one end arranges hanger A (1), leading screw (2) screw thread raceway (13) part stretches into stroke chamber enclosure (11) inside, stroke chamber enclosure (11) one end is cylindrical shape, its end face is end cap (4) fixedly, the other end is made as cone barrel type, its end face arranges hanger B (11), hanger B (11) is structure as a whole with stroke chamber enclosure (10), stroke chamber enclosure (11) is made as columnar partial fixing ball screw pair, ball screw pair comprises screw thread raceway (13), nut A (6), nut shim (7) and nut B (8), between nut A (6) and nut B (8) and screw thread raceway (13), ball is set, nut shim (7) is arranged between nut A (6) and nut B (8), bearing A (5) and bearing B (9) are separately positioned on nut A (6) and nut B (8) periphery, contact with stroke chamber enclosure (10) inwall, end cap (4) center is provided with the through hole identical with nut A (6) external diameter, fixedly flywheel (3) of end cap is passed in nut A (6) one end, flywheel (3) is arranged on leading screw (2) simultaneously.
2. the novel inertia element apparatus for automotive suspension according to claim 1, is characterized in that, described ball screw pair adopts inner circulation type ball screw pair.
3. the novel inertia element apparatus for automotive suspension according to claim 1, is characterized in that, described bearing A (5) and bearing B (9) are angular contact ball bearing, and both adopt face-to-face duplex in pairs to arrange.
4. the novel inertia element apparatus for automotive suspension according to claim 3, is characterized in that, the wrapping angle of described bearing A (5) and bearing B (9) middle (center) bearing steel ball and inner ring, outer ring is 15 °.
CN201420456163.6U 2014-08-13 2014-08-13 Novel inertia element apparatus for automotive suspension Active CN203979307U (en)

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104214295A (en) * 2014-08-13 2014-12-17 济宁中科先进技术研究院有限公司 Novel inertia element device for automobile suspension frame
CN109138566A (en) * 2018-10-10 2019-01-04 同济大学 It is used to appearance system using the tuning of collision friction damping energy dissipation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104214295A (en) * 2014-08-13 2014-12-17 济宁中科先进技术研究院有限公司 Novel inertia element device for automobile suspension frame
CN109138566A (en) * 2018-10-10 2019-01-04 同济大学 It is used to appearance system using the tuning of collision friction damping energy dissipation
CN109138566B (en) * 2018-10-10 2020-06-12 同济大学 Tuned inertial volume system using collision friction damping energy consumption

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