WO2018132925A1 - Dispositif amélioré d'isolation - Google Patents

Dispositif amélioré d'isolation Download PDF

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Publication number
WO2018132925A1
WO2018132925A1 PCT/CA2018/050074 CA2018050074W WO2018132925A1 WO 2018132925 A1 WO2018132925 A1 WO 2018132925A1 CA 2018050074 W CA2018050074 W CA 2018050074W WO 2018132925 A1 WO2018132925 A1 WO 2018132925A1
Authority
WO
WIPO (PCT)
Prior art keywords
hub
torque transfer
pulley
isolation
torque
Prior art date
Application number
PCT/CA2018/050074
Other languages
English (en)
Inventor
James W. Dell
Original Assignee
Litens Automotive Partnership
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Litens Automotive Partnership filed Critical Litens Automotive Partnership
Publication of WO2018132925A1 publication Critical patent/WO2018132925A1/fr

Links

Classifications

    • 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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/18—Means for guiding or supporting belts, ropes, or chains
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K25/00—Auxiliary drives
    • B60K25/02—Auxiliary drives directly from an engine shaft
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/50—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members
    • F16D3/64—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members comprising elastic elements arranged between substantially-radial walls of both coupling parts
    • F16D3/66—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members comprising elastic elements arranged between substantially-radial walls of both coupling parts the elements being metallic, e.g. in the form of coils
    • 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
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
    • F16F15/121—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon using springs as elastic members, e.g. metallic springs
    • F16F15/123—Wound springs
    • 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
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
    • F16F15/129—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon characterised by friction-damping means
    • 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
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/32—Friction members
    • F16H55/36—Pulleys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K25/00—Auxiliary drives
    • B60K25/02—Auxiliary drives directly from an engine shaft
    • B60K2025/022—Auxiliary drives directly from an engine shaft by a mechanical transmission
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/48—Vibration dampers, e.g. dual mass flywheels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
    • F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
    • F02B67/06—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus driven by means of chains, belts, or like endless members

Definitions

  • This disclosure relates to isolation devices for isolating vibration between an engine, particularly a vehicular engine and components driven by the engine via an endless drive member, and more particularly for isolating vibration between the engine and the endless drive member.
  • an isolation device in an aspect, includes a hub defining an axis and connectable to a rotatable shaft, a rotary drive member and an isolation spring.
  • the rotary drive member is rotatably mounted to the hub and has an endless drive member engagement surface that is engageable with the endless drive member.
  • torque transfer between the hub and the rotary drive member takes place via a first torque transfer member and a second torque transfer member which are slidably movable relative to one another to generate a frictional force.
  • the frictional force limits the torque that can be transferred within the selected first angular range.
  • a first limit surface on the first torque transfer member engages a second limit surface on the second torque transfer member to prevent relative sliding movement between the first and second torque transfer members, such that increasing relative angular movement between the hub and the rotary drive member results in increasing flexure of the isolation spring and increased torque transferred between the hub and the rotary drive member.
  • Figure 1 is a perspective view of an engine having an isolation device, according to a non-limiting embodiment of the present disclosure
  • Figure 2 is a perspective view of the isolation device shown in Figure 1 ;
  • Figure 3 is a perspective exploded view of the isolation device shown in Figure 1 ;
  • Figure 4 is a transparent view of a portion of the isolation device shown in Figure 1 ;
  • Figures 5A and 5B are magnified sectional views of a channel and lug from a spring shell and a pulley cover from the isolation device shown in Figure 1 ;
  • Figure 6 is a sectional perspective view of the isolation device shown in Figure 1 ;
  • Figure 7 is a graph illustrating torque curves for isolation devices of the prior art and an example isolation device in accordance with the present disclosure.
  • FIG. 1 shows an endless drive arrangement 10 for an engine 12.
  • the endless drive arrangement 10 provides an endless drive member 14 that is used to transfer power between the engine 12 and one or more accessories 15.
  • the endless drive member 14 may be a belt or any other suitable endless drive member.
  • the endless drive member 14 may be referred to herein as a belt 14 for readability, but it will be understood that it may be any suitable endless drive member.
  • the accessories 15 may include, for example, one or more of an alternator (or Motor-Generator Unit in some hybrid vehicles), a water pump, and an air conditioning compressor.
  • Each accessory 15 includes an accessory pulley 16 mounted to an accessory shaft 18.
  • the engine 12 has a crankshaft 20.
  • a tensioner 22 is used to maintain tension on the belt 14.
  • An isolation device 24 is provided in the endless drive arrangement 10 to reduce the transmission of torsional vibrations through the belt 14 to the components engaged by the belt 14.
  • the isolation device 24 is shown in a magnified view in Figure 2, in an exploded view in Figure 3, in a transparent view with some portions removed in Figure 4, and in a magnified sectional view in Figure 5.
  • the isolation device 24 includes a hub 26, a pulley 28, and at least one isolation spring 30 that is used to transfer torque between the hub 26 and pulley 28.
  • the hub 26 includes a shaft adapter 26a and a driver 26b.
  • the shaft adapter 26a is fixedly mountable in any suitable way to a rotating member (e.g. a device shaft, such as the engine crankshaft 20), for rotation about an isolation device axis A.
  • a rotating member e.g. a device shaft, such as the engine crankshaft 20
  • the hub 26 may be said to be connectable to a shaft of a device.
  • the crankshaft 20 may include threaded receiving apertures 31 that align with fastener pass-through apertures shown at 32a on the shaft adapter 26a, and at 32b on the driver 26b.
  • a plurality of threaded fasteners 36 may be used to pass through the apertures 32b and 32a and into the threaded receiving apertures 31 on the crankshaft 20 to clamp the driver 26b and the shaft adapter 26a to the crankshaft 20.
  • the driver 26b and the shaft adaptor 26a may be made from any suitable materials such as a suitable steel. In the example shown, the driver 26b is clamped between the shaft adapter 26a, and some plate-like members shown at 90 and 92 and which are described further below.
  • the pulley 28 has a belt engagement surface 29 which is engageable with the belt 14 (Figure 1 ) and is rotatably mounted to the hub 26 e.g. by means of a bearing member 38 ( Figures 3, 4) that directly supports the pulley 28 on the shaft adapter 26a, so that the pulley 28 is rotatable relative to the hub 26.
  • the pulley 28 may be made up of a first pulley portion 28a (which may be referred to as the main pulley portion and which has the belt engagement surface 29 (e.g.
  • the main pulley portion 28a may be metallic and may be formed from a process involving several steps including machining.
  • the second pulley portion 28b may be formed from sheet metal and thus may have its features formed using a stamping process or the like.
  • the pulley 28 is but an example of a rotary drive member that transfers power to and from the endless drive member (in this example, the belt 14). It will be understood that the pulley 28 could alternatively be any other suitable rotary drive member.
  • the belt engagement surface 29 of the pulley 28 may be referred to as an endless drive member engagement surface 29.
  • the bearing member 38 may be any suitable type of bearing member, such as, for example, a bushing made from Nylon impregnated with PTFE (TeflonTM) or the like.
  • the at least one isolation spring 30 transfers torque between the hub 26 and the pulley 28.
  • the at least one isolation spring 30 elastically deforms to isolate the belt 14 and the crankshaft 20 from vibrations or other sudden changes in torque in one or the other of the hub 26 and the pulley 28.
  • the at least one isolation spring 30 includes first and second isolation springs 30a and 30b, which are arcuate, helical compression springs. However, any other suitable type of springs could be used.
  • the isolation springs 30a and 30b are shown in a spring shell 33 that is mounted into the pulley 28 to transfer torque to or from the pulley 28.
  • the spring shell 33 has a plurality of channels 35 that engage lugs 37 on the pulley 28 to transfer torque therebetween.
  • the ends of the springs 30a and 30b engage lugs 39 in the spring shell 33 and thereby transfer torque to and from the pulley 28.
  • the lugs 39 on the spring shell 33 have an axial gap G ( Figure 3) therebetween.
  • the driver 26b has a plurality of drive arms 41 thereon that pass through the gap G and that engage the ends of the springs 30a and 30b so as to transfer between to or from the springs 30a and 30b.
  • An example of such an arrangement is shown in PCT publication WO2015010187A1 , the contents of which are incorporated herein by reference.
  • FIG. 4 One of the lugs 37 and one of the channels 35 are shown more clearly in Figures 4, 5A and 5B. As can be seen, the channel 35 has a first end 35a and a second end 35b.
  • the transfer of torque changes direction in the sense that initially it may be transferred from hub 26 to pulley 28 and then changes to being transferred from pulley 28 to hub 26, or vice versa.
  • illustrated in Figure 5A is a situation in which the hub 26 is being rotated clockwise and is transferring torque to the pulley 28.
  • the first end 35a of the channel 35 is abutted with the lug 37 on the pulley cover 28b and thereby transfers torque from the spring shell 33 into the pulley cover 28b via the lug 37 and channel 35 and therefore into the pulley 28.
  • the pulley cover 28b will move clockwise in the channel 35 until the lug 37 engages the second end 35b of the channel 35, at which point torque is transferred via the lug 37 and the channel 35 from the pulley 28 into the spring shell 33, and into the driver 26b via the springs 30, as shown in Figure 5B.
  • a first friction surface shown at 100 on the spring shell 33 ( Figure 6) slidingly engages a second friction surface 102 on the pulley 28 (e.g. on the pulley cover 28b) and thus a frictional damping force is transferred between the spring shell 33 and the pulley 28.
  • a damping arrangement biasing member 104 may be provided to urge the first and second friction surfaces 100 and 102 into engagement with a selected biasing force.
  • the biasing member 104 may be a disc spring and may be positioned to apply any suitable spring force on the spring shell 33.
  • the coefficient of friction between the surfaces 100 and 102 and the biasing force applied by the biasing member 104 may be selected to provide any suitable damping force during the aforementioned relative movement.
  • the spring shell 33 may be made from Nylon and the pulley cover 28b may be made from a metal such as steel or aluminum.
  • Figure 7 is a graph illustrating the torque displacement curve for an isolation device according to the present disclosure, and also two isolation devices known in the art.
  • Curve 1 12 represents an isolation device in which there is an initial region (shown at 1 12a) in which there is progressive flexure of secondary springs that are provided and which have a significantly lower rate than the primary isolation springs. After a certain amount of angular movement, the primary isolation springs begin to act and the effective spring rate increases (as can be seen in regions 1 12b).
  • Curve 114 is the curve representing an isolation device according to the present disclosure (e.g. isolation device 24).
  • a selected, constant torque is applied throughout a selected angular range of movement between the hub 26 and the pulley 28, represented by region 1 14a of the graph. Outside of this region (i.e. once the lugs 37 engage the end 35a or 35b of the channel 35), the springs 30 incur increasing or decreasing compression and as a result, the torque curve increases and decreases with angular position outside of the region 1 14a (i.e. in regions 1 14b of the curve 114.
  • the isolation device 24 further includes a seal member 88, a seal biasing member 90 and a dust shield 92. These cooperate to prevent leakage of lubricant (e.g. grease) out from the interior space of the pulley 28 and to inhibit dust and debris from entering into the interior space of the isolation device 24.
  • the seal member 88 additionally acts as another thrust bushing which is urged into engagement with the pulley 28 (specifically the cover member 28b), by the seal biasing member 90, so as to urge the pulley 28 and the bushing 38 over to a datum point against a shoulder on the shaft adapter 26 at one end of the support surface 34.
  • the lugs 37 While it has been shown for the lugs 37 to be on the pulley 28 (specifically on the pulley cover 28b), and for the channels 35 to be on the spring shell 33, it is alternatively possible for the lugs 37 to be on the spring shell 33 and for the channels 35 to be on the pulley cover 28b. Thus it may be said that there is a lug (or at least one lug) on one of the spring shell 33 and the pulley 28, and a channel (or at least one channel) on the other of the spring shell 33 and the pulley 28. [0029] In an alternative embodiment, the relative movement may be between other components, such as the driver 26a and the shaft adapter 26b instead of being between the spring sleeve 33 and the pulley 28.
  • the relative movement may be between the pulley cover 28b and the main pulley portion 28a.
  • the spring shell 33 and the pulley 28b are but an example of a torque transfer member and a second torque transfer member.
  • the pulley cover 28b which are slidably movable relative to one another to generate a frictional force, wherein the frictional force limits the torque that can be transferred within the selected first angular range (the range shown at 1 14a in Figure 7, or the range defined by the angular length of the channel 35 minus the angular length of the lug 37) and wherein, outside of the selected first angular range, a first limit surface (e.g. the end 35a or the end 35b of the channel 35) on the first torque transfer member engages a second limit surface (e.g.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Pulleys (AREA)

Abstract

L'invention concerne un isolateur qui comprend un moyeu pouvant être relié à un arbre rotatif, une poulie et un ressort d'isolation. La poulie est montée avec liberté de rotation sur le moyeu et vient en prise avec une courroie. Sur une première plage angulaire sélectionnée de mouvement relatif entre la poulie et le moyeu, un transfert de couple entre le moyeu et la poulie se produit par l'intermédiaire d'un premier élément de transfert de couple et d'un second élément de transfert de couple qui sont mobiles par coulissement l'un par rapport à l'autre pour engendrer une force de frottement qui limite le couple pouvant être transféré dans la première plage angulaire sélectionnée. En dehors de cette plage, une première surface limite vient en prise avec une seconde surface limite pour empêcher un mouvement de coulissement relatif entre les premier et second éléments de transfert de couple, de sorte que l'augmentation du mouvement relatif entre le moyeu et la poulie entraîne une flexion croissante du ressort et une augmentation du couple transféré entre le moyeu et la poulie.
PCT/CA2018/050074 2017-01-22 2018-01-22 Dispositif amélioré d'isolation WO2018132925A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201762449094P 2017-01-22 2017-01-22
US62/449,094 2017-01-22

Publications (1)

Publication Number Publication Date
WO2018132925A1 true WO2018132925A1 (fr) 2018-07-26

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Family Applications (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020223826A1 (fr) * 2019-05-08 2020-11-12 Litens Automotive Partnership Dispositif d'isolation avec deux ou plus de deux ressorts en série

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008058499A2 (fr) * 2006-11-15 2008-05-22 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Roue d'entraînement comportant au moins une poulie d'entraînement
WO2010099605A1 (fr) * 2009-03-03 2010-09-10 Litens Automotive Partnership Découpleur à ressort d'embrayage enveloppant de type hélicoïdal et ressorts amortisseurs à enroulement

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008058499A2 (fr) * 2006-11-15 2008-05-22 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Roue d'entraînement comportant au moins une poulie d'entraînement
WO2010099605A1 (fr) * 2009-03-03 2010-09-10 Litens Automotive Partnership Découpleur à ressort d'embrayage enveloppant de type hélicoïdal et ressorts amortisseurs à enroulement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020223826A1 (fr) * 2019-05-08 2020-11-12 Litens Automotive Partnership Dispositif d'isolation avec deux ou plus de deux ressorts en série

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