FR2642018A1 - DRIVE DEVICE EQUIPPED WITH A VEHICLE - Google Patents

Abstract

In a drive device fitted to a vehicle, the closing pressure of at least one of the gear selector couplings of a gearbox 66 which can be operated under load can be controlled by modulation, in "working mode", at the same time. 'using a controller 74, as a function of settings of a unit 75, 76 controlling the travel speed and as a function of the actual travel speed of the vehicle so as to achieve and maintain the desired travel speed, for example slipping of said coupling, while a drive motor 68 can simultaneously drive an operating device 72 at the same or different speed.

Description

DRIVE DEVICE EQUIPPED WITH A VEHICLE

  The present invention relates to a device

  drive for a vehicle that carries at least one device

  maneuvering eye which can be driven by its drive motor

  nement, comprising a displacement drive which consists of a hydrodynamic converter of rotation torques and a gearbox maneuverable under load, located downstream of said converter and provided with several

  gear selector couplings for engagement

  ment of different reports; as well as a

  order through which the conditions of service can be ordered

  a) "displacement mode", in which said drive motor

  This can be controlled by a speed control unit, in which the vehicle can

  be driven by the drive motor, by the

  putting the drive on the move, without driving if-

  simultaneously the operating device, and b) "working mode", in which it is possible to selectively drive, by the same drive motor, either only the operating device or this device

  maneuver and simultaneously also the vehicle.

  According to patent DE-C-26 56 474, there is known a drive device intended for a commercial vehicle, and in which the drive motor can drive not only the vehicle, but also, via a PTO shaft, a working or maneuvering device constituted, for example, by a snow plow with strawberries attached to the vehicle. In normal "displacement mode", the same vehicle drive motor drives the wheels of this

  vehicle through a gearbox; in re-

  vanche, in "working mode", it drives the vehicle wheels via a hydraulic pump and a hydraulic motor driven by the latter, while this same drive motor simultaneously drives the

  maneuver through a PTO shaft.

  In addition, other arrangements are known in practice.

  training devices fitted to vehicles and in

  which, by means of what is called a "power divider

  ce ", the vehicle's drive motor can lead conco-

  this vehicle and a maneuvering device. In the

  known drive devices, such power dividers

  sance are items that are needed in addition to the mode

  normal displacement, such as coupling couplings

  controllable, hydrostatic drives and

  hydrodynamic converters with adjustable fins.

  The object of the invention is to provide a device

  drive through which a single drive motor

  dragging can selectively lead either only the

  hicule, or only one operating device installed

  on this vehicle, or simultaneously said vehicle and the-

  said device, without requiring the additional presence of expensive constituent groups, in particular the aforementioned power dividers. The drive device must be able to be easily handled by an operator, guarantee proper operation and be of simple construction and

inexpensive.

  In accordance with the invention, this object is achieved by the fact that, in "working mode", the closing pressure of at least one of the gear selector couplings of

  the maneuverable gearbox under load may be

  controlled by modulation, using the control device, according to the settings of the speed control unit and according to the speed

  effective time of the vehicle, so that the speed of

  desired vehicle placement either achieved and maintained,

  by slipping of this gear selector coupling, tan-

  say that the drive motor can simultaneously drive

  the maneuvering device at a desired speed, identify

that or different.

  In "working mode", the reports from the gearbox

  maneuverable braids under load are preferably engaged

  automatically according to settings of the adjustment unit

travel speed age.

  In "working mode", at least two couplings

  respective gearbox selectors may function

  work simultaneously in skating mode, depending on

  movement speed adjustment unit.

  In "travel mode", it makes sense that the uni-

  travel speed adjustment tee is functional-

  separate from the gearbox selector couplings, this unit controlling, instead, a

motor adjustment.

  The training device can conveniently pre-

  feel an actuating device, using which the drive motor can be adjusted only in "working mode",

but not in "travel mode".

  Preferably, when the operating device is engaged in "working mode", the gearbox selector coupling, which is controlled by the displacement speed adjustment unit, receives at least one quantity each time increased cooling oil, higher

  the amount of cooling oil supplied to it

  vree in "displacement mode", when said coupling se-

  player works in skate mode.

  In a particularly advantageous manner, the power in slip mode of the gearbox selector coupling, which is controlled by the adjustment unit

  travel speed, is monitored and limited to

  Tomatically either by full opening or by closing

  integral and blocking of this selector coupling, when a determined value of the power in skating mode

is reached.

  Conveniently, the control device can close with locking effect a reaction wheel of the torque converter, in "displacement mode", and release this wheel in "working mode", in order to reduce the power absorption of the gearbox, so that said

wheel can rotate freely.

  In addition, the device according to the invention can be characterized in that, a) in "displacement mode" and when the operating device is not in service, the adjustment of the drive motor

  is provided by the travel speed adjustment unit

  cement, and the control of the maneuverable gearbox under load is ensured by a gear selector;

  b) when the switching device is in service, the regulation

  age of the drive motor takes place depending on the speed

  desired angular size of said maneuvering device, but however independently of adjustments of the speed adjustment unit; and c) in "working mode" and when the switching device is in service, controlling or regulating the pressure

  activation and operation in skating mode,

  during this pressure, one or more of the deliveries

  gear selector gearboxes for the gearbox that can be maneuvered under load, as well as the automatic shifting of gears, in said gearbox, are ensured by means of the speed adjustment unit

  of movement, in order to influence the speed of movement

vehicle cement.

  Finally, according to another advantageous characteristic

  se of the invention, the inversion of the adjustment unit of the

  travel speed, to control the drive motor

  in "displacement mode" or in order to control the modulated actuating pressure of one or more of the couplings

  gearbox selectors, can be operated automatically

  only depending on decommissioning or activation

  additional service of the switching device.

  Thus, in accordance with the invention, the solution of the object sought consists in that, to influence the speed of movement of the vehicle when the switching device is simultaneously in use, one or more

  several gear selector couplings which are pre-

  anyway, in the gearbox that maneuvers

  ble in charge. In order to distribute the friction work, a selector coupling can be replaced simultaneously by several selector couplings, actuated in mode

26420 1 8

  skating, so as to adjust any speed

  displacement independently of the angular speed of the device

same maneuver.

  In this specification, by the express-

  "gear selector couplings" means selector clutches taking both the form of two rotary elements and the form of a rotary element and a fixed element, the latter being also designated by "selector brakes " In practice. In addition, in the

  In this case, the expression "gear selector couplings

  ports "includes all of the selector clutches in the drive

  movement of a vehicle, which is usually necessary, in a vehicle, to engage or change a gear, or even to shift from forward to reverse

back, or vice versa.

  According to a particular embodiment of the invention, it is advantageous to use a hydrodynamic torque converter which encloses a wheel

  which can be selectively coupled and deactivated

  coupled, so that said torque converter can act selectively as a hydrodynamic brake or as a torque converter; and

  in which the reaction wheel can be "released",

  that the switching device is in service, so that

  reduce the power at idle of said converter when said switching device is in operation. The Liberation

  of the reaction wheel simultaneously has the effect of

  nuer, in "working mode", the generation of heat in the

  gear selector coupling which is used as

as a modulation element.

  In accordance with the invention, it is also advantageous, in order to increase the power in skating mode of the gear selector coupling which is selected to act as a modulating element, to increase the quantity of oil of cooling given to it

  when the operating device is in operation, i.e.

  say to deliver more cooling oil, when

  this operating device is in service, only in "shift mode

  cement ". According to a particular embodiment of the invention, it is wise to automatically limit,

  at a maximum admissible value, the power in pa-

  of the selector coupling serving as a mo-

  dulation. This limitation of power in skating mode

  can be assured that in the presence of a value

  said power ended, said selector coupling

  is either closed automatically in full, that is

  ie with blocking, or fully open.

  The invention provides a simple, inexpensive and reliable device, by means of which the power dividers

  mentioned above are no longer required.

  The invention will now be described in more detail.

  tail by way of nonlimiting examples, with reference to the appended drawings in which: FIG. 1 schematically illustrates a device

  drive combined with a six-speed gearbox

  ports, manoeuvrable under load, as well as a hydrodynamic torque converter, installed upstream;

  FIG. 2 schematically represents a device

  drive tif associated with a compressed gearbox

  nant a three-speed transmission upstream of which is installed a reversible transmission, as well as a

  hydrodynamic torque converter, implant

  upstream tee; and Figure 3 schematically shows a device

  drive according to the invention, equipped with a device

  control device which can also be used for the

  positive drive according to Figures 1 and 2.

  The driving training of a vehicle, it-

  glossy in Figure 1, consists of a hydro-

  dynamic 10 of torques and a gearbox-

  its 20 which can go into action under load, and is desi-

  hindered by "maneuverable gearbox under load". Via an input shaft 14, a pump impeller 12

  of the converter 10 can be driven by a drive motor

  vehicle, not shown. A turbine wheel 16 of the converter 10 is connected to the gearbox 20 via a drive shaft 18. In the operating condition "displacement mode", a reaction wheel 22 of the converter 10 is servo controlled by a brake

  selector 24, thereby being prevented from turning. From the exit

  te, the converter 10 can transmit a high torque to the gearbox 20. For the "working mode" operating condition, the reaction wheel 22 can be released by the selector brake 24 and then perform a free rotation, so that the converter 10 cannot then pass on,

  on the gearbox 20, that a strong idling torque

ment reduced.

  The gearbox 20 which can be maneuvered under load comprises, for example, four planetary trains 27, 28, 29 and 30, as well as six selector clutches 31, 32, 33, 34, 35 and 36. The clutches 31, 32, 34 and 36 may also be referred to as "selector brakes" because they allow,

  each time, the connection not between two rotating parts

  ves, but between a rotary part of the planetary trains and a non-rotary part, subject to a casing 38 of the gearbox. For the passage of a first gear I, the two clutches 31 and 34 must be closed; for the passage of a second gear II, the clutches 31 and 35 must be closed; for the passage of a third report III, the clutches 32 and 34 must be closed; for the passage of a fourth IV gear, the clutches 32 and 35 must be closed; During the passage of a fifth V gear, the clutches 33 and 34 must be closed; and, to engage reverse gear R, the clutch 36 and one of the

  two clutches 34 and 35 must be closed. These couples

  gear selector elements, necessary for shifting gears and briefly referred to below as' clutches

  selectors ", are automatically closed when switching on

  the report in question. 40 speed sensors an-

  are used to measure the angular speed of the parts

  primary and secondary parts of selected clutches

  tors 24 and 31 to 36. To control the power that can be transmitted by the gearbox 20, as well as the angular speed of its output shaft 62, one or more of the clutches 24 and 31 to 35 are actuated in skating mode ,

  the pressure of a control oil, closing said em-

  clutches, then being reduced to a value less than

  that of the oil pressure which is necessary to close

  fully sea said clutches, with resulting blocking effect. This control oil pressure can be

  controlled or regulated, for each clutch selector

  simultaneously, depending on the desired vehicle speed and / or on the desired angular speed

  an operating device, driven by the driving motor

  vehicle. It then takes place, depending on the speed-

  if desired angular, a modulation of the pressure

  the control oil in the selector clutch considered.

  Cooling oil can be supplied to the

  clutches 31 to 35 by means of hydraulic conduits

  ques 42 of a cooling device 43. FIG. 1 only shows, schematically, the hydraulic conduits 42 associated with the selector clutch 34. At

  by means of electrical conductors 41, the device for

  cooling 43 is controlled by a regulating block 78 visible in FIG. 3, so that the selector clutches, controlled by pressure modulation in "working mode", receive a quantity of cooling oil

  larger than in "travel mode".

  The other embodiment of a training in

  displacement, illustrated schematically in FIG. 2,

  closes a gearbox 44 which can be maneuvered under load and which is composed of a three-speed transmission 45, as well as a reversible transmission 46 installed upstream. Upstream of this reversible transmission 46, there is a

  hydrodynamic converter 10 of torques, equi-

  pe of a selector clutch 24 to lock or release se-

  its reaction wheel 22. Its pump wheel 12 can be connected, via an input shaft 14, to a drive motor (not shown) of a vehicle, and

  its turbine wheel 16 is connected to the reversible transmission

  ble 46 by means of a drive shaft 18. The reversible transmission 46 comprises a planetary gear 47 provided with a selector clutch 52, taking the form of a selector brake, in order to engage the forward gear V ; as well as another planetary gear 48 with a clutch

  selector 54, in the form of a selector brake, in order to

  engage reverse gear R. The transmission 45 comprises a planetary gear 49 provided with a selector clutch 56 produced in the form of a selector brake, and another selector clutch 58 for selectively connecting a hollow pinion 57 of this train 49 either to the casing 38 (second gear), or to a drive shaft 59 (third gear); as well as a second planetary gear 50 provided with a selector clutch 60 which is designed as a selector brake, and can be closed for the engagement of a first gear I. The planet pinion carrier 61 of the planetary gear 50 associated with the first report I is connected to an output shaft 62 of the gearbox 44 maneuverable under load. Speed sensors 40 are used to measure the speed of rotation of the

  primary parts of selector clutches 52, 54, 56 and 60.

  Because the secondary parts of these clutches 52, 54, 56 and 60, produced in the form of selector brakes,

  are rigidly connected to the casing 38 of the box, their vi-

  angular size is permanently zero. On the basis of the relative angular speed between the primary and secondary parts, the control circuit according to the invention automatically calculates the power in skating mode of the selector clutches, in "working mode", and an overload of said clutches actuated in mode skating is avoided based on the calculated power value in skating mode.

  In the gearbox according to figure 2, my-

  noeuvrable under load, the selector clutches 52 and 54 of the reversible transmission 46, respectively intended for

  forward V and reverse R, can for example-

  ple, in accordance with the invention, - be used as skating clutches with pressure modulation, with a view to controlling the speed of movement of a vehicle in "working mode". In place of or in addition to these clutches 52 and 54, one or more of the aforementioned selector clutches 56, 58

  and 60 of transmission 45 can also be used.

  as selector clutches with pressure modulation

  if we. Following the concomitant use of several em-

  selector clutches, instead of a single clutch

  selector, power in skating mode is distributed over several clutches, less heat is generated in the individual clutches, and these clutches

  can be made smaller.

  Figure 3 schematically shows a device

  drive equipped with a control device 74,

  me to the invention, to order and adjust a box of vi-

  tesses 66 maneuverable under load and able to be of a

  reading identical or similar to that of one of the boxes

  of gears 20 and 44 of FIGS. 1 and 2. A drive motor

  68 of a vehicle leads by its motor shaft 70, on

  one side, the hydrodynamic converter 10 of

  ples of rotation which is provided with the selector clutch 24;

  and, on the opposite side, said motor simultaneously drives an apparatus

  maneuvering eye 72 which is fixed to the vehicle. The device

  74 according to the invention comprises an electrical apparatus

  adjustment plate 11, for the remote control of the drive motor 68 by means of a pedal 75 by which an electric generator 76 of position signals

  can be operated; an electro-hydraulic regulation block

  than 78 which is installed on gearbox 66 and pos-

  sede conduits 80 for admitting the control oil, for actuating the selector clutches of said gearbox 66, conduits 82 for return of the control oil, as well as conduits 84 for supplying cooling oil, who

  leave said regulation block 78 and reach the clutches

  ges selectors of the box 66, and through the

  that an increased quantity of cooling oil can be supplied to these clutches actuated in skating mode;

  a gear selector 86, installed on a control station

  vehicle walking; an actuator 88 which

  is arranged on an actuating station of the ma-

  work 72, and consists of an actuating lever 90 and an electric generator 92 of adjustment signals; a

  variator 94 of operating modes, provided with a relay

  electric mutation 96 to allow conversion between the "displacement" F and "work" A modes; as well as a

power source 98.

  In "displacement mode" F, the gear selector 86 is electrically connected to the control unit 78, by means of electrical contacts 102 and 103, in order to engage a desired gear in the gearbox 66 maneuverable under load; the generator 76 for pedal position signals 75 is electrically connected, by

  through electrical contacts 104 and 105 of the varia-

  tor 94 of operating modes, to the device 11 for adjusting the

  drive motor 68, so that the access position

  leration of this motor 68 can be adjusted using the pedal 75; the actuating device 88 is inactive, since it is deactivated by the variator 94; the drive motor 68 is controlled, in a known manner, from the pedal 75; and the gearbox 66 is

  controlled by the selector 86, in a known manner.

  In "work mode" A, the gear selector 86

  is electrically separated from control block 78 by the

  through the relay of the variator 94 of operating modes the generator 76 of pedal position signals 75 is electrically separated from the motor adjustment device 11, by means of the relay 96 of said variator 94;

  instead, the generator 92 of the adjustment signals of the

  similar 88 actuation of the operating device 72 is

  electrically connected to the motor control device 11

  tor, via contacts 106 and 107 of relay 96

  switched, for adjusting the power of the input motor

  drag 68; and pedal 75 is electrically connected

  ment to the regulation block 78 by its generator 76 of

  general positions, via electrical contacts

  triques 108 and 109 of the switched relay 96, so that

  said pedal 75 controls the speed of movement of the

  hicle through said regulating block 78, by se-

  automatic reading of reports in gearbox 66 and by actuation in skating mode, with pressure modulation,

* 26420 1 8

  at least one of the selector clutches of said gearbox 66. The power in skating mode of selector clutches

  at modulated pressure of the box 66 is monitored electrically-

  ment and, if a maximum permissible value is exceeded-

  sible of this power, it is automatically terminated

  actuation in skating mode, either by integral closure

  the and blocking, either by full opening of the clutch

  selector considered. In gearbox 66, caps

  angular speed sensors 40 according to FIGS. 1 and 2 serve

  wind to automatically calculate the power in pati mode

nant.

  The control device 74 according to the invention

  This involves the following process: a) when the vehicle is in conventional "travel mode" F, the switching device not being in service, the control or adjustment of the drive motor 68 and of the gearbox 66 maneuverable under load takes place from the vehicle operating control station, by

  via pedal 75 and the gear selector

ports 86;

  b) when, in "work mode" A, only the operating device

  vre 72 is driven by the drive motor 68, but not the vehicle, the control or the adjustment of said motor 68

  takes place only through the action apparatus-

  88, depending on the requirements of the device.

maneuvering eye 72; and

  c) when, in "work mode" A, the drive must be

  bend both to the switching device 72 and to the vehicle (via the gearbox

  66), pedal 75 no longer acts on the driving motor.

  ment 68, but it acts on the selector clutches of the gearbox 66 via the block 78, with the effect of modulating the actuation pressure, while

  adjusting the acceleration of said motor 68, and consequently

  sequence an adjustment of the angular speed of said device

  72, are provided by the adjusting device 11

  engine age, through the action device-

88.

  During additional commissioning and

  switching off the switching device 72, the varia-

  94 of operating modes also causes each time, automatically, the necessary transition from "travel mode" to "work mode", and vice versa.

  The operating device 72 is normally driven

  born at a constant angular speed, while the vehicle is moved at a variable speed. However, the invention also encompasses the case in which the operating device is driven at a variable angular speed and the vehicle is driven at a constant angular speed, or even

  variable, by the same drive motor 68.

  It goes without saying that many modifications can be made to the device described and shown,

  without departing from the scope of the invention.

Claims (10)

-R E V E N D I C A T I 0 N S-   1. Drive device for a vehicle which carries at least one operating device which can be driven by its drive motor, comprising a drive   on the move which consists of a hydrodyna-   mic of torques and of a maneuverable gearbox under load, located downstream of said converter and provided with several gear selector couplings for engagement of different gears; and a control device through which the conditions of service can be controlled   a) "displacement mode", in which the motor drives   ment (68) can be controlled by a unit (75, 76) for adjusting the speed of movement, and in which   the vehicle can be driven by the drive motor   ment, by means of the displacement drive, without simultaneously driving the operating device (72), and   b) "work mode", in which it is possible to train   selectively, by the same drive motor (68), either only the operating device, or this operating device and simultaneously also the vehicle, device characterized in that, in "working mode", the closing pressure at least one of the couplings   gearshift selectors (66)   real load can be controlled by modulation, at   using the control device (74), depending on the settings   ges of the unit (75, 76) for adjusting the speed of movement   and depending on the actual traveling speed of the vehicle, so that the traveling speed   desired vehicle is achieved and maintained, by pati-   this gear selector coupling moves, while the drive motor (68) can simultaneously drive   the operating device (72) at a desired speed, iden- tick or different.   2. Drive device according to the claim   tion 1, characterized in that, in "work mode", the   gearbox reports (66) maneuverable in tank   ge are automatically engaged, depending on settings   of the unit (75, 76) for adjusting the speed of movement.   3. Drive device according to the claim   tion 1 or 2, characterized in that, in "work mode",   at least two respective gear selector couplings   gearbox ports (66) maneuverable under load operate simultaneously in skating mode, depending on   settings of the speed setting unit (75, 76) placement.   4. Drive device according to any one   as claims 1 to 3, characterized in that,   in "displacement mode", the unit (75, 76) for adjusting the displacement speed is functionally separated from the gear selector couplings of the gearbox   (66) maneuverable under load, said unit (75, 76) controlling   instead, an engine adjusting device (11).   5. Drive device according to any one   as claims 1 to 4, characterized by the presence   an actuator (88) with which the motor   drive (68) can only be set in "shift mode   vail ", but not in" travel mode ".   6. Drive device according to any one   as in claims 1 to 5, characterized in that,   when the switching device is engaged in "working mode"   vail ", the gear selector coupling of the gearbox (66) maneuverable under load, which is controlled by the unit (75, 76) for adjusting the speed of movement, each time receives at least an increased amount oil   cooling, greater than the amount of cooling oil   cooling given to it in "displacement mode", when this gear selector coupling operates in skating mode.   7. Drive device according to any one   as in claims 1 to 6, characterized in that   the power in slip mode of the gear selector coupling of the gearbox (66) maneuverable under load, which is controlled by the adjustment unit (75, 76)   travel speed, is monitored and limited auto-   matically either by full opening or by closing   integral and blocking of this selector coupling, when   that a determined value of the power in skating mode is reached.   8. Training device according to any one   as in claims 1 to 7, characterized in that the   control device (74) closes a reaction wheel (22) of the torque converter (10) in "displacement mode", with locking effect, and releases this wheel in "working mode", in order to reduce the power absorption   of the gearbox (66) maneuverable under load,   te that said wheel can accomplish a free rotation.   9. Drive device according to any one   as in claims i to 8, characterized in that,   a) in "displacement mode" and when the operating device   (72) is not in use, the adjustment of the drive motor   This is ensured by the unit (75, 76) for adjusting the   movement speed, and the control of the gearbox   braids (66) maneuverable under load is ensured by a gear selector (86); b) when the operating device (72) is in service, the adjustment of the drive motor (68) takes place as a function   of the desired angular velocity of said ma-   work (72), but however independently of adjustments   of the speed adjustment unit (75, 76)   is lying; and c) in "working mode" and when the operating device (72)   is in service, the command or regulation of the pressure   actuation and operation in skating mode,   depending on this pressure, one or more of the ac-   gearbox selector couplings   its (66) maneuverable under load, as well as the automatic change of gears, in said gearbox (66), are ensured by means of the unit (75,   76) for adjusting the speed of movement, with a view to   influence the speed of movement of the vehicle.   10. Training device according to any one   as in claims i to 9, characterized in that   inversion of the unit (75, 76) for adjusting the speed of movement, in order to control the drive motor (68) in "displacement mode", or else in order to control the modulated actuation pressure one or more of the gear selector couplings   (66) maneuverable under load, operates automatically in operation   decommissioning or addi- tional commissioning   operating device (72).