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
  • 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
  • F16F15/124—Elastomeric springs
  • F16F15/1245—Elastic elements arranged between substantially-radial walls of two parts rotatable with respect to each other, e.g. between engaging teeth
• • 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
  • F16D3/70—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 in holes in one coupling part and surrounding pins on the other coupling part
• • 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
  • F16D3/02—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions
  • F16D3/12—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions specially adapted for accumulation of energy to absorb shocks or vibration
• • 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
  • F16H2055/366—Pulleys with means providing resilience or vibration damping

Definitions

• the invention relates to the field of automobiles, and more particularly to motion transmission and filtering devices.
• Motion transmission devices are widely present on motor vehicles. This type of device is found in gearboxes. They are used, for example, to obtain an output rotation speed different from an input rotation speed.
• Motion transmission can generate jolts and vibrations, reducing the longevity of the mechanical parts of the motor vehicle. The user can also feel these vibratory and sound nuisances.
• German document published under the number DE 102009000014 describes a device for transmitting and filtering vibrations.
• This device comprises a first rotary element and a second rotary element which is coupled to the first rotary element. Coupling is achieved by means of a series of damping elements. These damping elements are three in number, and are inserted in housings in the first rotary element.
• the second rotary member comprises pins, housed in cavities formed inside the damping elements. The rotation of the first rotary member causes the rotation of the damping elements, which in turn causes the second rotary element to rotate.
• a technique for filtering vibrations consists, in addition to the motion transmission device and filtering, to install a flyweight at the end of the compressor shaft. This increases the inertia and decreases the vibrations. In return, such a technique has many disadvantages, among which a pronounced fatigue of the elements of the compressor, to the detriment of the longevity of this organ.
• a first objective is to provide a device that is able to filter the vibrations over a wide range of frequencies, especially less than 140 Hz, while remaining compact and low weight.
• a second objective is to overcome the use of specific elements designed to create inertia to reduce vibrations.
• a device for transmitting rotational movement and vibration filtering comprising a first rotary element and a second rotary element coupled to the first rotary element, the coupling being made by primary damping elements, defining a first filter stage capable of filtering vibrations, the coupling being furthermore produced by secondary damping elements defining a second filtering stage, this coupling being arranged in such a way that the rotation of the first rotary member causes rotation of the primary damping elements, which cause rotation of the secondary damping elements, in turn causing the rotation of the second rotary member, the static stiffness of the first filter stage being less than the stiffness static filter second stage of at least ten percent.
• the static stiffness of the first filter stage is less than the static stiffness of the second filter stage of at most 40%.
• the static stiffness of the first filter stage is less than the static stiffness of the second filter stage of at least 15 or 20%, especially about 15%.
• stiffness values thus selected are particularly advantageous: below 10%, mode coincidences may be problematic, and beyond 40% can be observed a decrease in endurance of the device. A difference of 15 to 20% is very advantageous for preserving endurance performance while obtaining the desired technical effect.
• This device significantly improves the efficiency of filtering, to the benefit of passenger comfort and longevity of mechanical parts. In addition, it eliminates the use of a flyweight to create rotational inertia.
• the device comprises a support member provided with pins, on which are mounted the primary damping elements, and arms, on which are mounted the secondary damping elements;
• the primary damping elements and the secondary damping elements may preferably be identical: it is thus possible to rationalize their manufacture by obtaining the desired stiffness variations by adapting their assembly and the design of the arms and pawns. .. but retaining only one type of damping element.
• the pins have, in section, a starry profile
• each arm comprises a bend, so that a longitudinal axis of the arms is substantially perpendicular to a longitudinal axis of the pins;
• the first rotary element is a pulley comprising in section a rail provided with two lateral edges, the rail comprising teeth, the lateral edges being raised relative to the teeth and together forming a reception zone for a belt;
• the pulley comprises a main cavity, provided with an annular notch, this annular notch being able to receive an annular belt provided with a plurality of tongs for receiving the primary damping elements;
• the second rotary element has a general disc shape comprising a series of bores for accommodating the secondary damping elements
• the primary damping elements and the secondary damping elements are provided with a groove, this groove making it possible to house the primary damping elements in the clamps of the annular belt housed in the first rotary element on the one hand, and to accommodate the secondary filtering elements in the holes of the second rotary element on the other hand.
• the whole piece and pads can be obtained by a single mold bi-material injection.
• FIG. 1 is a perspective view of the front of a motor vehicle equipped with a device for transmitting motion and filtering vibrations
• FIG. 2 is an exploded perspective view of a device for transmitting motion and filtering
• FIG. 3 is a sectional view along the plane of section III-III of a first rotary element of the device of FIG. 2,
• FIG. 4 is a perspective view of the device of FIG. 2;
• FIG. 5 is a perspective view of a second rotary element of the device;
• FIG. 6 is a perspective view of a support element of the device
• FIG. 7 is a sectional view along the section plane VII-VII of a pin of the support element of FIG. 6,
• FIG. 8 is a perspective view of the support element of FIG. 7 provided with damping elements
• Figure 9 is a perspective view of the support member inserted in the first rotatable member.
• FIG. 1 a front portion of a vehicle 1 automobile.
• This vehicle 1 comprises a powertrain 2 provided with a compressor 3 air conditioning.
• the air conditioning compressor 3 comprises a shaft (not shown) on which is mounted a device 4 for transmitting motion and filtering.
• the device 4 is driven by a belt 5.
• an axis X defining a longitudinal, horizontal direction coinciding with the general direction of movement of the vehicle 1,
• a Y axis defining a transverse, horizontal direction which, with the X axis, defines a horizontal XY plane;
• the device 4 comprises a first rotary element, hereinafter called a pulley 6.
• the pulley 6 has a generally circular shape.
• the pulley 6 comprises in section a rail 7.
• the rail 7 is provided with two lateral edges 8. Between the two edges 8 side, the rail 7 is provided with teeth 9.
• the lateral edges 8 are raised relative to the teeth 9, so as to form a reception area for the belt 5.
• the teeth 9 allow the belt 5 to adhere to the rail 7.
• the pulley 6 comprises a main cavity 10 and a secondary cavity 11.
• the secondary cavity 11 is formed in the main cavity 10 by a disc 12 which extends one of the lateral edges 8.
• the disk 12 extends substantially in the XZ plane and has a hole 13 at its center.
• An annular belt 17 comprises a series of clamps 18. Each clamp 18 comprises two hooks 19 defining a housing 20. In the embodiment shown in the figures, the annular belt 17 comprises six clamps 18. The annular belt 17 is advantageously obtained by injection with the pulley 6. Other embodiments of the annular belt 17 may nevertheless be used.
• the device 4 comprises a support element 21.
• the support element 21, shown in detail in FIG. 6, comprises an annular base 22 defining an orifice 23.
• the support element 21 comprises, on an outer periphery 24 of the annular base 22, studs 25.
• the pins 25 have, in section, a star-shaped profile defining a plurality of ripples 26.
• the support element 21 comprises six pins 25.
• the support member 21 further comprises a plurality of arms 27.
• a base 28 of each arm 27 extends partly on the outer periphery 24 and on a side face 29 of the annular base 22.
• Each arm 27 comprises a bend 30 modifying the direction of extension of the arms 27.
• a longitudinal axis 31 of the arms 27 is substantially perpendicular to a longitudinal axis 32 of the pins 25.
• a series of primary damping elements 33 are mounted on the pins 25, and represent in the following a first vibration filtering stage. These primary damping elements 33 comprise a passage 34, able to receive a pin 25 of the support element 21. These primary damping elements 33 also include a groove 35, the function of which will be explained later.
• a series of secondary damping elements 36 serves as a second filter stage.
• the secondary damping elements 36 have a geometry similar to that of the primary damping elements 33.
• the secondary damping elements 36 are mounted in force on the arms 27.
• the arms 27 have a smooth surface, which advantageously makes it possible, in conjunction with the force assembly, to increase the static stiffness of the second filtering stage.
• the device 4 comprises a second rotary member hereinafter referred flange 37.
• the flange 37 is provided with a series of holes 38.
• the flange 37 has a general shape of disk extending in the plane XZ.
• a nozzle 39 extends perpendicular to the flange 37, and may for example be reported by screwing on the axis of the system equipped with the device, this system may be for example an air conditioning compressor for a motor vehicle (not shown here).
• the annular belt 17 is obtained by molding during the injection of the pulley 6.
• the primary damping elements 33 are mounted on the star pins 25, and the secondary damping elements 36 are mounted through the holes. 38 flange 37. These montages are in force.
• the support member 21 is inserted into the main cavity 10 of the pulley 6, as illustrated in FIG. 9. The insertion is made by forcing the passage of the primary damping elements 33 through the hooks 19, level of the grooves 35.
• the flange 37 is then reported, so that the secondary damping elements 36 are inserted into force on the arms 27 of the support member 21.
• the nozzle 39 of the second rotary member then extends inside the main cavity.
• a rotation of the pulley 6 causes the rotation of the primary damping elements 33, which rotate the support member 21 on which are mounted the secondary damping elements 36.
• the secondary damping elements 36 finally rotate the flange 37 which can transmit the movement to a mechanical part of the automobile vehicle 1.
• the device 4 is advantageously mounted on the shaft of the air conditioning compressor 3 of the vehicle 1. More precisely, the compressor shaft 3 is fixed to the nozzle 39. of the flange 37. Thus, a belt 5, mounted on a crankshaft engine (not shown) can drive the shaft of the compressor 3, via the device 4.
• the vibrations can be decomposed along the three axes X, Y and Z.
• the provision of primary damping elements 33 and secondary damping elements 36 advantageously reduces vibrations according to these three axes.
• the vibrations are reduced by a slight movement back and forth along Y, made possible by the mounting of the secondary damping elements 36 on the arms 27. The In this way, vibrations are partly dissipated by the movement back and forth.
• the provision of the primary damping elements 33 relative to the secondary damping elements 36 advantageously reduces the vibrations felt around the axis of rotation Y.
• each filtering stage depends on two criteria. On the one hand, increasing the number of damping elements on each floor implies an increase in the contact area. Thus, the greater the contact area, the more vibrations will be transmitted. On the other hand, reducing the number of damping elements weakens the device 4.
• Each filtering stage thus advantageously comprises six damping elements, ensuring robustness and filtering of vibrations.
• the static stiffness of the first filter stage is less than the static stiffness of the second filter stage of at least ten percent.
• a double filter stage having a differentiated stiffness of at least ten percent between the filter stages advantageously allows to filter the vibrations above a threshold value of about 90 Hz.
• the device 4 transmits the movements while filtering the vibrations whose frequency is greater than about 90 Hz. For frequencies greater than about 90 Hz, their amplitude is damped to become negligible.
• Another advantage is that it is no longer necessary to add a flyweight, in order to generate inertia on the end of the compressor shaft 3 to limit vibration.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Acoustics & Sound (AREA)
• Aviation & Aerospace Engineering (AREA)
• Air-Conditioning For Vehicles (AREA)
• Pulleys (AREA)
• Vibration Prevention Devices (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=55650530

Family Applications (1)

Country Status (4)

Citations (4)

Family Cites Families (3)

• 2016
  • 2016-01-14 FR FR1650286A patent/FR3046823B1/fr active Active
  • 2016-12-19 WO PCT/FR2016/053549 patent/WO2017121937A1/fr active Application Filing
  • 2016-12-19 EP EP16826399.4A patent/EP3403001A1/fr not_active Withdrawn
  • 2016-12-19 CN CN201680078149.9A patent/CN108463648B/zh active Active

Patent Citations (4)

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