FR2710408A1 - Pedal value transmitter. - Google Patents

Abstract

Pedal value transmitter characterized in that the movable body (23) is mounted in the guide cage (22) so as to be able to move parallel to the displacement surface (27).

Description

"Pedal value transmitter"

State of the art.

  The invention relates to a pedal value transmitter with a transmitter shaft which is capable of being rotated by a motor vehicle accelerator pedal by means of a mechanism against the restoring force of a return spring device which cooperates with a rotation angle sensor delivering an electrical pedal value signal, with a guide cage for at least one movable body and with a surface

  overshoot for this movable body against which it

  ci is prestressed by a spring, while the guide cage and the movement surface establishing a direction of movement of the guide cage are susceptible

  to be moved by the shaft of the transmitter one relative

  port to port, the displacement surface comprising at

  minus one ramp corresponding to a determined angle of rotation

  mined, through which the moving body is

  likely to be moved against the spring preload

  comes out in the guide cage of a first established section-

  sant a first level of the displacement surface on a second section which establishes a second level. Such a pedal value transmitter is known from the document

  DE 34 11 455 AI. This pedal value transmitter includes

  carries a transmitter shaft mounted so that it can

  rotate in a housing, and which is likely to be

  dragged in rotation by the accelerator pedal of a vehicle

  motor vehicle against a return spring device.

  For the detection of the pedal position, the transmitter shaft cooperates with the rotation angle sensor which delivers an electric pedal value signal which

  corresponds to the position of the pedal and therefore to the

desired travel time.

  In the case of motor vehicles with automatic gearboxes, it is necessary that during acceleration there is switching. back to the next lower step. For this, an appropriate switching signal is required. This signal is produced when the pedal is depressed beyond a rotation angle determined by an electrical switching contact or when an angle of rotation is noted.

rotation determined.

  To avoid unintentional switching in re-

  turn, mechanical resistance, therefore a net increase

  perceptible reaction force on the pedal

  accelerator must precede the electrical switching point

  stick. To this end, there is provided in a guide cage at least one smoothing or rolling body which cooperates with a displacement surface in the housing, surface on

  which is the track of the rolling body and which

  carries a ramp arranged at a determined angle of rotation

born.

  If the rolling body is prestressed against over-

  displacement face is moved against this prestress

  via the rising ramp of a first level

  calf at a second level, the increased effort required

  to do this causes mechanical resistance

  noticeable on the pedal which corresponds to the commu-

tation.

  When backing up the accelerator pedal

  erator and therefore when the rolling body goes back on the ramp, the same increase in force, but this

once undesirable, is noticeable.

Advantages of the invention:

  The pedal value transmitter according to the

  On the other hand, vention has the advantage that an increase

  effort when the accelerator pedal goes back is not noticeable because the moving body is mounted in the guide cage so as to move

  parallel to the displacement surface.

  Thanks to the mounting thus provided of the movable body, one obtains

  advantageously that this movable body during its re-

  turn on the first level cannot transmit to the guide cage any force component acting in its direction of movement therefore in the direction of movement of the guide cage which is noticeably perceptible to the

accelerator pedal.

  Thanks to the invention, better contact with the pedal is thus made possible, thanks to which a gain of

  comfort is obtained when using the vehicle

mobile.

  Thanks to other provisions provided according to the

  vention, advantageous additions and improvements to the previously indicated pedal value transmitter are possible. It is particularly advantageous that the movable body is mounted in the guide cage so as to move parallel to the displacement surface and that the displacement path of the movable body in the guide cage in the direction of displacement thereof is greater than 1.5 times

the length of the moving body.

  In an advantageous addition to the invention, the movable body is brought back to its first level by eluding the ramp. In this case also the mobile mounting advantageously prevents an undesirable transmission of force on

the guide cage.

  To guarantee reduced wear of the pedal value transmitter, a guide recess is provided by which the movable body can be brought to the return surface and the displacement surface for the movable body.

  is provided on a metal surface

tal.

  Other features of the invention relate to

  There are other advantageous complements to it: - the guide recess is provided on an insert in

  plastic in the support of the moving surface

is lying,

  - the support of the displacement surface is as-

  associated with a plastic guide structure, on which the return surface is formed and which has an oblique guide surface for bringing the movable body back onto its own track, - the movable body is housed in an oblong hole in the guide cage ,

  - as a movable body, a ball is provided.

  Drawings: Examples of embodiment of the invention are shown by way of example in the attached drawings and

  will be described in more detail in the description below.

  after: - Figure 1 is a schematic top view,

  with partial cuts, from a pedal value transmitter.

  - Figure 2 is a section essentially along

line II-II of Figure 1.

  - Figure 3 shows different relative positions

  movement surface and guide cage

  when depressing the accelerator pedal.

  - Figure 4 shows different rela-

  movement surface and guide cage

  when returning the accelerator pedal.

  - Figure 5 is a schematic perspective view

  part of the travel surface support with

  the guide structure associated therewith.

  - Figure 6 is a schematic top view on the internal surface of the displacement surface support

  and of the guide structure according to FIG. 5.

  - Figure 7 is a section along line VII-

VII of Figure 5.

  In the various figures of the drawings the

  constituent parts corresponding to each other are

with the same references.

  Description of the exemplary embodiments:

  In Figure 1 is shown a transmitter of

  pedal value 10 with a housing 11, in which an ar-

  the transmitter 12 is mounted so that it can turn

  ner. At its end 13 projecting from the housing 11, the transmitter shaft 12 carries an operating lever 14 which is suitably biased by an accelerator pedal not shown of a motor vehicle

  to rotate in the housing 11 the transmission shaft

  tor 12 correspondingly to the position of the pedal.

  In the housing 11 there is provided a device 15 of a res-

  return spell disposed coaxially with respect to the transmitter shaft 12 and which comprises a first spring cage 16 integral in rotation with the transmitter shaft 12 and a second spring cage 16 or 17 connected locked in rotation to the housing 11. In the spring cages 16, 17 are housed two return springs acting in parallel 18, 19 which during the rotation of the transmitter shaft 12 exert a reaction force which acts as a return on the

accelerator pedal.

  In a manner not shown, an angle sensor of

  rotation and possibly one or more contact contacts

  mutation, which correspond to one or more deter-

  rotation position mines are associated with the other end, located in the housing 11, of the transmitter shaft 12. The rotation angle sensor and the or

  well the switching contacts are connected to an electro-

  vehicle charging via an electric line

  that 20 leaking out of the housing 11 in a sealed manner.

  To create, when the accelerator pedal is depressed beyond a determined angle of rotation, a mechanical resistance which is clearly perceptible on the pedal, a mechanism 21 is arranged in the housing 11, a mechanism which includes, like the indicates figure 2 a cage

  guide 22 locked in rotation on the transmission shaft

  tor 12 for one or more mobile bodies, which are in particular

  ment made in the form of sliding or rolling bodies 23, and which also comprises a support 24 of the displacement surface coaxial with this cage. The rolling bodies 23 preferably produced in the form of balls are mounted

  in oblong holes 25 extending in the periphery direction

  risk and are preloaded radially outwards

  against a displacement surface 27 on the sur-

displacement face 24.

  The displacement surface 27 has one or more

  several ramps, in particular three uniformly distributed 28 ramps

  parts on the periphery which respectively delimit a first section 29 of a second section 30 of the displacement surface 27. The first sections 29 are then located

  a first level which compared to a second level of the

  cond section 30 is offset radially outwards.

  If it is necessary to have several

  pressure points, therefore to provide respectively a re-

  mechanical resistance for different pre-rotation angles

  defined, the ramps 28 can also have between them

  different peripheral distances.

  As can be seen in Figures 3 and 4, the

  length L of the oblong holes 25 is greater in the direction

  peripheral device preferably greater than 1.5 times the corresponding length D, i.e. the diameter of the

  balls acting as rolling bodies 23.

  The operating mode of the driving mechanism thus described will be explained in more detail.

below.

  In Figure 3 is shown the displacement of

  the guide cage 22 relative to the displacement surface

  ment 27 during actuation or insertion of the

  accelerator plate, the starting position being indicated on the representation on the left and the terminal position on the representation on the right. Correspondingly, it is

  indicated in figure 4 the backward movement of the rolling body

  lant 23 and the guide cage 22 from its end position to its starting position, the displacement of the guide cage 22 being shown from right to left. As long as the rolling body 23 is moved on the

  first section 29 of the displacement surface 27, the eff-

  strong K produced by means of the accelerator pedal only has to overcome the return force of the return springs 18,19. As soon as the rolling body 23, which is applied against the rear edge of the oblong hole 25, is guided on the ramp

  28, it is pressed by the ramp 28 against the action of the res-

  goes out 26. The force f acting in this case between the rolling body 23 and the ramp 28 parallel to the direction of movement of the guide cage 22 is transmitted by the

  rolling body 23 to the guide cage 22.

  To overcome this force f an additional force

  keep quiet k must be produced with the accelerator pedal, this force representing the desired mechanical resistance

  sensitive on the accelerator pedal. On the second section

  lesson 30 of the displacement surface then acts again against the further displacement of the guide cage 22

  the return force of the return springs 18, 19.

  If during the return of the accelerator pedal the rolling body 23 is brought back from the second section 30 over

  the ramp 28 on the first section 29 of the clearance surface

  placement 27, as shown in Figure 4, then the oblong hole 25 is with its front section

  already above the ramp 28 because the rolling body 23 is

  bend again against the rear edge of the oblong hole 25.

  As soon as the rolling body 23 reaches with its over-

  support face of the ramp 28, the distance between the front edge of the oblong hole 25 and the ramp 28 is already greater than the

  length D of the rolling body 23 in the direction of travel

  cement. In this way, a gap is created between the

  front edge of the oblong hole 25 and the ramp 28, gap through

  towards which the rolling element 23 can "fall back" over the ramp 28 of the second section 30 on the first

  section 29 of the displacement surface 27, without transmitting

  be at the guide cage 22 a reaction force produced

by the spring 26 urging it.

  Thus, when the accelerator pedal goes back, only the return force produced by the return springs 18, 19 of the return spring arrangement 17 is sensitive to this pedal, even when the

  rolling body 23 is brought back onto the ramp 28.

  FIGS. 5 to 7 show by way of example another embodiment of the invention in which, next to the displacement surface support 24, is disposed, axially offset with respect thereto, a guide structure 31 which is preferably plastic. The displacement surface support 24 preferably made of metal comprises in the region of the second section 30 of the displacement surface 27 a recess 32 in which is placed

  insert 33 having a guide recess 34.

  This guide recess 34 is then arranged so that it axially shifts the rolling body 23 (not shown in FIG. 5) and then brings it back to the first level, in which case the rolling body 23 arrives on a return surface 35 provided on the guide structure 31 and which

  extends in a peripheral direction along the ramp 28.

  In the area of the first section 29 of the travel surface

  cement 27, there is provided on the guide structure 31 a guide surface 36 extending obliquely to the axial direction, and which displaces the rolling body 23

  axially without causing a radial offset.

  As shown in Figure 6, the body

  roller 23 is guided in an oblong hole 25 disposed obli-

  only in relation to the peripheral direction in relation to

  to the axial direction in the guide cage 22 not shown

  felt in FIGS. 5 to 7. In FIG. 6 the outline of the

  oblong hole 25 provided in the guide cage 22 is all-

times shown.

  To obtain mechanical resistance when the accelerator pedal is depressed, the rolling body 23 is guided along its own track B on the displacement surface 27, on the occasion of which it arrives from the first section 29 via the ramp 28 to the second section 30 of the displacement surface 27. The body

  roller 23 cannot then leave the moving surface

  ment 27 because it is held in application against the rear edge of the oblong hole 25 which is located in the area of the

displacement surface 27.

  As soon as the rolling body 23 reaches the hollow of

  guide 34 it is moved by the force of the spring 26 acting

  on him along track B 'on the surface of re-

  turn 35. The rolling element 23 is then brought back to the first level I () transversely to the direction

  movement of the guide cage 22.

  When the accelerator pedal returns, the rolling body 23 moves along track B "on the return surface 35 and is already at the first section 29 of the displacement surface 27 on the surface support. displacement 24. Then, the rolling body 23,

  after it has passed ramp 28, is brought back from the over-

  guide face 36 along track B "'towards the section 29 of the displacement surface 27. In this way, the

  rolling element 23 can be returned to its position of

  leaves without that resulting in an annoying reaction on

the accelerator pedal.

  In this embodiment of the invention it is particularly advantageous that the rolling body 23 is kept in the radial direction constantly in abutment against displacement or guide surfaces, because thus possibly annoying click noises can

  be avoided during the "fallout" of the rolling element 23.

  In the embodiments shown the guide cage 22 and the springs 26 are integral in

  rotation of the transmitter shaft 12, so that an os-

  cillation of the transmitter shaft 12 about its axis of rotation causes the guide cage 22 and the springs 26 to oscillate. However, embodiments are also also possible in which the guide cage is connected to the housing, while 'then the displacement surface of the rolling body 23 is connected to the shaft of the transmitter so that during an oscillation of the transmitter shaft 12 the displacement surface oscillates or

also turns well.

R E V E N D I CATIONS

  1- Pedal value transmitter with a transmitter shaft (12) mounted so that it can rotate, and which is capable of being rotated, against the return force of a return spring device (15), by an accelerator pedal in the motor vehicle by means of a mechanism, and which cooperates with a rotation angle sensor delivering an electrical signal of pedal value, with a guide cage (22) for at least a movable body (23) and with a displacement surface (27) for the movable body (23), against which the latter is prestressed by a spring, while the guide cage (22) and the displacement surface (27 ), in the direction of movement of the cage

  guide (22) being fixed, are likely to be displaced

  created in relation to each other by the transmission shaft

  tor (12), the displacement surface (27) comprising at least one ramp (28) corresponding to a determined angle of rotation, by means of which the movable body (23) is capable of being displaced against the prestressing

  of the spring in the guide cage (22) of a first section

  step (29) of the displacement surface (27) determining a first level on a second section (30) which determines a second level, pedal value transmitter characterized in that the movable body (23) is mounted in the cage guiding

  (22) so that it can move parallel to the over-

displacement face (27).

  2- Pedal value transmitter according to the re-

  vendication 1, characterized in that the movable body (23) is mounted in the guide cage (22) so as to be able to move in its direction of movement parallel to the

displacement surface (27).

  3- Pedal value transmitter according to the re-

  Vendication 1 or claim 2, characterized in that the path of movement of the movable body (23) in the guide cage (22), in the direction of movement thereof, is greater than 1.5 times the length of the movable body (23). in the direction of movement of the guide cage (22).

  4- Pedal value transmitter according to the re-

  vendication 1, claim 2 or claim 3

  characterized in that the movable body (23) in the guide cage (22) is held so as to be able to move transversely relative to the direction of movement of this cage and that alongside the displacement surface (27) offset laterally towards the track (B) of the movable body (23) there is provided beyond the ramp (28) a surface of

  return (35) fixing rotation with respect to the surface of

  placement (27), which is located on the first level and through which the movable body (23) can be

  brought transversely to the direction of travel

  cementing of the guide cage (22) on the first level and can be brought back avoiding the ramp (28) on its own

displacement surface (27).

  - Pedal value transmitter according to claim 4 characterized in that on the second section

  (30) from the displacement surface (27) at a certain distance

  tance of the ramp (28) there is provided a guide recess (34) by which the movable body (23) is capable

  to be brought to the return surface (35).

  6- Pedal value transmitter according to one of the

  previous claims characterized in that the surface

  movement (27) for the movable body (23) is provided

  on a metal travel surface support (24).

  7- Pedal value transmitter according to the re-

  vendication 6 characterized in that the guide recess (34) is provided on a plastic insert (33) in

  the support (24) of the displacement surface.

  8- Pedal value transmitter according to the re-

  Vendication 6 or claim 7 characterized in that the support (24) of the displacement surface is associated with a guide structure (31) of plastic material, on which is formed the return surface (35) and which comprises a

  oblique guide surface (36) for bringing the mo-

bile (23) on its own track (B).

  9- Pedal value transmitter according to one

  of the preceding claims characterized in that the

  movable body (23) is housed in an oblong hole (25) in the

guide cage (22).

  - Pedal value transmitter according to one

  of the preceding claims characterized in that as

  movable body (23) a ball is provided.