FR2742835A1 - MECHANICAL BODY FOR CONVERTING A ROTATION INTO A TRANSLATION OR REVERSE - Google Patents

Abstract

The invention provides a movement conversion member having little play, allowing all the desired directions of departure and not bulky. It comprises a cylinder (5) rotatably supported on a base body (6) and coupled to a rotation connection (rotary knob 1), the lateral area of which carries a first guide element (11), as well as an element sliding (8) supported axially movable on the base body and having a second guide element (8d, 8e) cooperating with the first. The two guide members define on the lateral area of the cylinder a guide path having an axial direction component and a circumferential direction component. Applicable for example to mechanical controls for positioning air flaps in heating or air conditioning systems of motor vehicles.

Description

The invention relates to a mechanical member of

  motion conversion, comprising a rotational coupling

  tion and a linear motion or translational

  which is kinematically coupled to the rotational coupling

  tion, so that the organ can convert a movement

  turning in a linear motion or vice versa.

  Such a body is suitable, for example, for converting

  firing a rotary actuating movement of a control button on the control apparatus of a heating or air-conditioning system of a motor vehicle in a linear or translational movement which is then transmitted by a Bowden cable to a heating or cooling system adjusting element, such as an air shutter, for positioning the adjustment element in accordance with the position at which the button is brought

  control. The mechanical parts of mold conversion

  which is known and used for this purpose.

  tion, for example in the form of a cam

  disc, toothed sector or endless screw,

  what is coupled each time a lever, or in the form

  a toothed wheel with which it meshes with a rack.

  These known devices are problematic in this sense

  that they most often have a lot of play,

  do not put, frequently, all departure directions

  of the consecutive transmission element of the

  or translation, such as a Bowden cable, and are

  relatively bulky. In addition, the coupling of a

  to move in an arc may cause a

  unwanted circular motion of a connected Bowden cable.

  The technical problem underlying the invention is the provision of a mechanical movement conversion member, of the type mentioned at the beginning, which is compact, has little play and a high

  stability, comparatively little demand for material, self-

  in addition to practically all the directorates of de-

  desired share of a motion transmission element

  linear or translation coupled to the translational coupling

  tion and avoids circular motion components of

this element.

  This problem is solved by a mechanical motion conversion member of the type indicated at the beginning, which is characterized by a cylinder coupled to the rotational coupling and rotatably supported on a base body, which has

  its area or side wall a first element of guiding

  as well as a sliding element coupled to the coupling

  translation cord and axially movably supported on the base body, which has a second guide element cooperating with the first, the two cooperating guide elements defining on the lateral surface of the cylinder a guide path having a steering component

  axial and a circumferential direction component.

  The member thus produced comprises a cylinder

  as a rotating element and a sliding element as

  can perform a linear motion. The cylinder and the sliding element are mechanically coupled, by means of cooperating guiding elements, so that the rotation of the cylinder causes a linear displacement of

  the sliding element in the axial direction, which is ob-

  held by the effect that the cooperating guiding elements define on the lateral area of the cylinder a guide path having an axial direction component and a circumferential direction component. Because of

  this type of conversion between a rotation and a transla-

  tion, the body thus constructed requires only relative

  space and has high stability

  that the amount of material needed is comparative-

  weak. By the appropriate choice of the axial slope of the guide path - defined by the cooperating guide elements of the cylinder and the sliding element -, any desired transmission ratio between the rotating movement and the linear movement can be created. It adds that the member can be constructed with little play only, especially at the points of reversal of the direction of movement, and that virtually all the desired starting directions are possible for the connection of the

  linear or translational motion to the slide element

  health. If necessary, the fitting concerned may, for this purpose,

  be equipped in addition to a deviator element of movement ap-

  propriety, such as a conical toothed wheel or an articulated

  culé. As the sliding element of the conver-

  sion itself already performs a pure linear motion, unwanted circular motions or components

  analogous curves of a transmission element.

  coupled linear motion, such as a Bow-

  den, are prevented. The organ can be used for

  transmission of movements in both directions, that is,

  say to convert a rotating motion applied into a linear motion or conversely, to convert a

  linear motion applied in a rotating motion.

  An embodiment of the invention

  the coupling between the guide elements of the sliding element and those of the cylinder, is characterized in that the cylinder guide element comprises at least one guide groove whose path

  has an axial direction component and a component

  circumferential direction and the sliding element

  sant has a cylindrical lateral surface coaxially adjacent to the cylinder, internally or externally, on which is disposed, as a second element of

  guiding, at least one guiding pin engaged in the rai-

  corresponding guide of the cylinder.

  According to this embodiment, one or more guide pins is engaged or engaged in a corresponding groove in the lateral area of the cylinder, which groove may be constituted for example by a slot which passes through the side wall of the cylinder or by a gutter not crossing this wall. According to whether the cylindrical lateral surface provided as part of the sliding element is received coaxially by the cylinder or, conversely, the cylinder coaxially surrounds this cylindrical lateral area, the channel is then on the inside or on the side. outside the lateral area of the cylinder.

  An improvement of the invention is characterized

  in that the guide path defined by the two

  co-operating guide elements of the cylinder and the element

  slidably, forms a closed peripheral path in itself or is composed of several path sections

  mutually parallel shifted guides

  circumferential circumference. According to this improvement, the guide path on the lateral area of the cylinder is a

  closed curve in itself and making the whole of the cy-

  liner, but it can also be made up of sections of

  guide jet mutually offset in parallel in di-

  circumferential rection. For this purpose, it is possible to provide, for example, preferably several tenons

  uniformly distributed on the lateral

  lindrique of the sliding element and engaged in one or more grooves. This gives a very evenly distributed stress forces acting on the side walls of the cylinders and the sliding member

during the motion conversion.

  Another improvement of the invention is characterized by cooperating guide elements on the sliding element on the one hand and on the basic body

  on the other hand for the guidance with axial mobility of the ele-

  slidably on the base body, the cooperating guide elements defining a guide path having

  an axial line which is bent in the circumferential direction

  in at least one of its two

  tions. For axial mobility guidance of the element

  sliding on the basic body, this pre-

  thus sees two cooperating guide elements defining an axially oriented and circumferentially L-shaped guide path in the circumferential direction in at least one of its two end portions. This bent conformation of the

  end portion of the guide path provides this

  right a blockage vis-à-vis a motion reaction

  linear, which means that when the sliding element

  was brought by the rotation of the cylinder to this po-

  end position with blocking, it can no longer be pushed by a reverse pressure exerted on its translation fitting; moving in direction

  contrary to the sliding element is, on the contrary, pos-

  only after rotation in the opposite direction of the cylinder.

  Yet another embodiment of the invention

  According to the invention, the cylinder is coaxially received in a base body bushing which has at least one axially extending guide groove as a guide element for axial mobility guidance of the sliding element, and the element sliding is received

  in the cylinder so that its cylindrical lateral area

  drique is coaxially adjacent to the lateral area of the cylinder, the guide element of the sliding element

  being formed by at least one guiding pin which makes

  projecting outwardly from its cylindrical lateral surface, tenon which passes through a guide groove of the

  cylinder formed as a guide slot and is

  pledged in the guide groove of the sleeve forming

basic body.

  Thus, a guide pin carried by the sliding element serves simultaneously to the axial guidance of this element on the base body and to the kinematic coupling.

  cylinder, so that it is not necessary to pre-

  see separate tenons for these two guiding functions.

sliding element.

  A development of this embodiment is characterized by a second pair of parts forming respectively a cylinder and a sliding member, second pair which coaxially surrounds the base body bushing, the second cylinder being secured in rotation with the first cylinder and having its lateral area at least one guide slot whose path has an axial direction component and a circumferential direction component, and the second sliding member having a second linear motion or translational connection of the motion conversion member, and at least one radially inwardly projecting guide pin, which tongue passes through the corresponding guide slot of the second cylinder and engages in a guide groove which is coordinated with it and arranged with an axial pattern.

  in the basic body socket.

  This gives a conversion device of

  movement in which two parallel linear movements

  leles are coupled to a rotating movement. The application of a single rotating movement, for example, allows in this way to produce simultaneously two linear movements, without the need for space of the organ being

  significantly increased by the addition of the second

  néaire. The appropriate conformation of the two guide paths of the cylinders and sliding elements, makes it possible to adjust the transmission ratios between the rotating movement and each linear movement of any

  desired way, especially so that these reports

ports differ from each other.

  Other features and advantages of the

  will become clearer from the description

  which will follow several nonlimiting examples of embodiment, and the accompanying drawings, in which: - Figure 1 is a side view of an element

  control system for adjusting an air flap of a system

  heating or air-conditioning system of a self-

  mobile element, which comprises a mechanical member

  conversion of motion to convert a tour-

  nant in a linear motion; - Figure 2 is an axial section along the line II-II of Figure 1; FIG. 3 is a developed representation of the lateral area of a cylinder that can be used for the motion conversion member of FIGS.

  2, having two separate guide slots, mutual

  offset in the circumferential direction; FIG. 4 is a representation similar to FIG. 3 for a conformational variant of the cylinder side area, having a guiding groove closed in itself and running around the cylinder; FIG. 5 is a view similar to FIG.

  2 of a motion conversion device modified by

  port to that of Figures 1 and 2; FIG. 6 is a variant of the element of

  control shown in Figure 1, in which the direction

  axis of the motion converting member is

  perpendicular to the axis of rotation of an action button

  ment; FIG. 7 is a side view of another variant of the control element of FIG. 1, in which the motion conversion member is arranged to convert a rotating movement into two separate linear movements; and FIG. 8 is an axial section along the

line VII-VII of FIG.

  The control element represented on the

  1 and 2, serves to control an air shutter that is not

  of a heating or air-conditioning system of a motor vehicle by a rotary knob 1 and comprises a mechanical movement-converting member 2 which

  converts the turning movement of Knob 1 into a movement

  linearly transmitted by a Bowden cable 3 connected to the air shutter for the positioning of this flap according to the position of the button. It is mounted on the front wall 4 of the housing of a control unit - the other parts of which are not shown - of the heating or air-conditioning system and passes through a central end of the axis the recess 4a on the side. before the

frontal king 4.

  On the free end of the end of axis la, is

  wedged a cylinder 5 forming part of the converging member

  movement 2 and having a front end side 5a closed. The cylinder 5 is open at the end 5b

  opposite. It is rotatably disposed in a socket 6

  the basic body of the motion conversion organ.

  2 and rigidly connected to the front wall 4 of the housing

  tier, of the rear face 4b from which it exceeds

  right angles. By annular flanges 7a, 7b made

  radially protruding outwards at both ends.

  mits, the cylinder 5 is kept axially immobile,

  but with the possibility of turning in the socket

  6. The end of the axle constitutes a

  rotation connection of the motion conversion member

  2. Cylinder 5 itself contains a common element

  smoothing in the form of a cylindrical slider 8 which has, at the midpoint of its cylindrical wall 8a, a bearing wall 8b o exceeds, towards the open side of the cylinder 5, a fastener 8c for one end of the core 3a of the Bowden cable 3, which thus constitutes a connection for linear movement or translation of the motion conversion member 2. The cable sheath is fixed at this end of the Bowden cable by a bolt 9 to a

  cable attachment 10 rigidly connected to the bushing

basic body mantle 6.

  To transform the rotary motion of the cy-

  lindre 5 in an axial linear movement of the slide 8,

  it carries two guide pins 8d, 8e which make

  it projects outwardly from its cylindrical lateral surface 8a at the height of its partition 8b and with a mutual offset of 180 in the circumferential direction. These tenons pass through a guide groove made in the form of a slot 11 - having a direction component

  axial and a component of circumferential direction -

  in the side wall 5c of the cylinder, and are each engaged in a corresponding guide groove formed by an axially oriented slit 12a or 12b of the base body bushing 6. Each of the tenons 8d and 8e of the slider 8 thus forms, on the one hand, a first pair of guide elements cooperating with the guide slot 11 of the side wall 5c of the cylinder, a pair of elements which defines a first guide path, as well as, on the other hand, a second pair of cooperating guide members with the coordinated base body bushing 12a or 12b, a pair of elements which defines a second guide path. The layout of each guide path therefore corresponds to the path of the slot of

guide 11; 12a, 12b coordinate.

  The two slots 12a, 12b of the base body bushing 6, provided with a mutual offset of 180 in the circumferential direction, in accordance with the

  8d, 8e diametrically opposite guide posts of the neck

  slice 8, each end in their final portion

  nale remote from the rotary knob 1, by a 12c end bent in the circumferential direction. This L-shaped elbow is oriented in the direction in which the

  tenon 8d, 8e - engaged in the slot 12a or 12b correspon-

  dante - is pushed, during movement to this end position, by the rotation of the cylinder 5 produced by the operation of the rotary knob 1. As soon as the guide pin 8d or 8e of the slide, engaged in the slot 12a or 12b corresponding to the base body bushing, has reached this end position in

  the bent end 12c of the slot by the appropriate rotation

  Aside from the cylinder 5, a blockage has been obtained in that a reverse pressure, caused for example by a reaction force applied by the core 3a of the Bowden cable, can be accommodated by the base body bushing 6. , without the slider 8 being pushed towards

  5. It is only when this last

  deny is consecutively turned in the opposite direction that the

  8d, 8e of the slider come out of the common ends

  12c, slots 12a, 12b of the base body bushing and then, the rotation of the cylinder 5 being

  continued, the slider 8 is again axially displaced.

  5. The slots 12a, 12b of the sleeve, slots which are axially oriented, prevent any rotational movement of the slide 8. The two diametrically opposite guide pins 8d, 8e of the slide allow, in cooperation with the corresponding guide slits 11, 12a, 12b, a uniform transmission of forces between the cylinder 5 or the base body bushing 6 and the slider 8, which avoids

  unilateral solicitations and losses by friction

  higher levels related to it.

  The layout of the guide slot 11 of the wall

  5c of the cylinder, having a component of

  axial rection and a circumferential

  as shown diagrammatically in dashed line.

  1, converts the rotary movement of the cylinder 5 into a linear movement of the slider 8. By way of example, FIGS. 3 and 4 show two possible configurations of the slit or guide slits, if appropriate. for a cylinder system and

  slider adjusted in a suitable way with respect to

  1 and 2, Figures 3 and 4 each representing

  the area or the side wall of the cylinder in the devel-

  oped. The conformation according to FIG.

  for the motion conversion member 2 shown in FIGS. 1 and 2. In this case, the side wall 5c

  of the cylinder contains two guide slots 11b, 11c

  offset by 180 in the circumferential direction and composed of linear segments which succeed one another with different axial slopes in order to

  of obtaining a desired transmission ratio,

  the angular position between the rotary motion and the linear motion. The two slots llb, llc do not intersect, which avoids problems guiding studs 8d, 8e carried by the slide and passing through these

  slots, each of which extends over an angle of

  a little less than 180. The delimitations to the ex-

  slots of the slots llb, lic define each time end stops, so that this variant of

  conformation is suitable for applications in

  it is desirable that the button 1 can be rotated between two end positions defined by spaced stops, in the example shown, a rotation angle of little less than 180. The smaller the axial direction component, the more the component in the

  direction of rotation of the guiding slots l1b, lic of the pa-

  5c lateral king of the cylinder is at the same time large, smaller will be the amplitude of the linear motion for

  a given rotation angle of the rotating movement. Rap-

  carrying forces of actuation associated with the movement li-

  on the one hand, and the rotational movement on the other hand, is a corresponding inverse relation. To further change the transmission ratio, we can if necessary

  interpose a mechanical transmission gear or

  between button 1 and cylinder 5.

  Figure 4 shows a variant in the-

  that the side wall 5d of the cylinder is provided with a single guide groove 11a which is closed in itself, does all the round, does not cross the wall 5d and is

  similar to a gutter which has, in its de-

  veloped, a symmetrical sinusoidal plot with respect to

  a generatrix of zero angle 13 indicated in dashed line

  tinu in Figure 4. In this variant, the coordinated slider, guided in the cylinder, is modified in this way

  that it only has a guide pin that is

  secured in this circumferential groove 11a of the lateral area of the cylinder. It is obvious that this variant

  suitable for modified devices, compared to

  1 and 2, so that the cylindrical lateral surface of the slider is located coaxially between the lateral surface of the cylinder and the base body bush and the slider cooperates with guide pins projecting both towards the interior and

  outwards with the corresponding guide grooves

  on the side area of the cylinder and the socket

  base body mantle respectively. Button 1 of this

  variant may not have end-stops. A movement

  rotation of 180 corresponds to the entire race of the

linear motion.

  Another variant of the control element of FIGS. 1 and 2 in which the knob can rotate endlessly is shown in FIG. 5, in which the same references have been chosen for parts that are unchanged with respect to FIGS. 1 and 2 and for which we can

  refer to the above description in relation to

  FIGS. 1 and 2. In this variant, there is provided a

  5 'modified liner whose side wall is provided on its outer side with a guiding groove 11d all around, similar to a gutter and not passing through

  not the wall of the cylinder, the layout of which corresponds to

  He is the groove lla of Figure 4. This modified motion conversion member further comprises a base body sleeve 6 'which has more than one axial slot 12'. A bush-shaped modified slider 8 'coaxially surrounds the bushing 6' forming a basic body. At its outer periphery, this slider has a fastener 8h for one end of

  the core 3a of the Bowden cable 3, which is connected by a

  9 to a modified cable attachment 10 ', which is arranged in this case directly on the front wall 4 of the housing of the control unit of the heating or air conditioning system. At the place where the bush-shaped slide 8 'externally has the fastener 8h for the core of the cable, it is provided internally with a single guide pin 8f radially inwardly projecting through the axial slot 12 'of the socket

  base body and engaged in the guiding groove

  11d circumferential roll of the cylinder 5 '. The location of the tenon 8f on the inner side of the side wall of the bush-shaped slide 8 'at the precise location where the fastener 8h is externally located for the core of the

  cable, ensures a favorable behavior for the transmission

  effort, which reduces to a minimum the demands

  irregular movements of the slider 8 'which could

  otherwise drag increased loads of the slider 8 'or increased losses by friction during its movement. The continuous rotation of the button 1 and consequently of the cylinder, therefore causes, as desired, the advance and the

  recoil in the axial direction of the slider 8 '.

  As a variant of the example shown by the

  Figure 5, we can envisage the realization of two

  mutually parallel shifted guide

  circumferential direction of an angle that can be pre-

  fixed, for example 180, in the lateral area of the cy-

  liner, in the manner of the groove 11d of the cylinder 5 'of Figure 5, in which case the bush-shaped slide is provided with two similar guide pins to the pin 8f of Figure 5 and mutually offset in the circumferential direction of a corresponding angle. In adaptation to these two pins, the base body sleeve is then also provided with two axial guide slots, so that a tenon engages through a

  slot of the basic body bushing in a groove

  The other end engages the other slot of the base body bushing in the other groove of the cylinder. The fact that the two grooves in the lateral area of the cylinder intersect does not

  poses no significant difficulties for the guidance of

  of the slide because of the movement of movements

  ments and force ratios, especially if the two guide grooves intersect at a relatively large angle, which is ensured in all cases if the two grooves are mutually offset by approximately

  or, in any case, more than 90.

* Figure 6 shows a control element

  heating or air-conditioning system of a vehicle

  automobile which corresponds essentially to that of Figures 1 and 2 and for which the same

  references for functionally identical parts.

  Unlike the control element according to

  1 and 2, there is provided here a rotary knob 15 which is coupled not directly, but via an articulated axis 16, provided in addition, to a mechanical member of motion conversion 2 corresponding to that of FIGS. and 2. In this example, the bushing 6, forming the base body of the conversion member 2, is not fixed directly to the rear side of the front wall 4 of the housing of the associated control apparatus, but, not shown, to other parts of this

  casing, so that the longitudinal axis of the

  The conversion unit 2 is perpendicular to the rotational axis

  The deflection (deflection) thus required between the rotary movement of the knob 15 and the rotary movement of the cylinder 5 of the conversion member 2 is ensured by the articulated axis 16 which is coupled by a end at one end of the axis 15a of the button 15 and at its other end to an end of axis 18 secured in rotation with the cylinder 5 and serving as a connection

  rotation of the conversion member 2.

  After being thus changed in direction, the rotary movement of the button is converted by the conversion member 2 into a linear movement or translation of the connected Bowden cable 3, the linear movement being perpendicular to the axis of rotation 17 of the button 15. in this example and therefore parallel to the front wall 4 of the housing of the control unit. The comparison of the example according to FIG. 6 with that of FIGS. 1 and 2 shows how one can obtain

  simple, using the conversion member 2 in combination

  with an appropriate return element, such as the

  articulated 16, virtually any desired departure direction

  Bowden cable 3. The conversion unit 2

  only little room for incorporation, as

  of great stability for a relatively small amount of material employed, and has a low clearance in the motion conversion. As the cable 3 is

  coupled directly to the slider 8, itself guided axially

  prevented from spinning, it is not subject to any component of circular motion by the

  conversion 2 during the transmission of motion.

  Figures 7 and 8 show an element of

  of a heating or air-conditioning system

  tomobile whose fundamental structure corresponds to that of the control element according to FIGS. 1 and 2

  and which is arranged in addition, by the addition of a pair-

  addition of a cylinder and a slider, to provide a second linear motion. Since the construction of this control element corresponds

  to that of the element according to Figures 1 and 2, we used

  the same references and we can refer to this

  regard to the above description in relation to the

  1 and 2. The control element according to FIGS.

  and 8 uses a mechanical motion conversion device

  19 which is derived from the conversion member 2 according to Figures 1 and 2 in that the bushing forming the base body 6 of the latter is coaxially surrounded by a second cylinder 20 rotatably supported on this base body. being prevented from moving axially. The second cylinder 20 is itself surrounded by an axially shorter sleeve 21 which serves as a second sliding element, that is to say a bush-shaped slide. The second cylinder 20 or outer cylinder,

  present in its side wall, as the cylinder 5 si-

  killed inside, one or more guide slots 22

  having an axial direction component and a component

  health of circumferential direction. The base body bushing 6 is modified, with respect to FIGS. 1 and 2, in that, besides the two guide slots 12a, 12b arranged at a mutual angular distance from each other,

    In the first example, two guiding slots are provided.

  of the same shape, so that four axially oriented guide slots are arranged at equal angular intervals of 90 on the base body bushing 6, one slot 12a of which is indicated in broken lines in FIG. 7 and another slot 28

  is shown in dashed lines in Figure 8. The

  slider 21, in the form of a sleeve, has two pins

  mutually shifted guide 180 in the circumferential direction.

  conferred and radially projecting towards the

  interior, one of which is shown in Figure 8. These

  23 penetrate radially inwards the slot

  22 coordinate of the outer cylinder 20 and engage each

  cun in one of the two additional slots provided in the base body sleeve 6. Thus, this

  last serves to guide axially and to prevent rotation

  both the cylindrical slide 8 located at the in-

  socket and the sleeve-shaped slide 21 are

  outside. The outer periphery of the last slide 21 carries a fastener 24 for the web 25a of a second Bowden cable 25 which, together with the first Bowden cable 3, is connected by their respective fastening means 9, 26 to the end. on the control element side, a fastener 27 which is modified relative to that of Figures 1 and 2 and arranged itself on the wall

  before 4 of the housing of the control unit.

  The two cylinders 5 and 20 are coupled cinematically

  in a manner not shown, for example by an interconnection which secures them in rotation to their ex-

  Open trenches on the side of Bowden cables. From this

  In turn, a rotation of the button 1 simultaneously produces a linear movement of the inner slider 8, movement transmitted by the first cable 3, and a linear movement of the outer slider 21 transmitted by the second cable 25. The latter can lead to another component. air, not shown, the heating or air conditioning system for positioning. The control element according to FIGS. 7 and 8 therefore makes it possible to simultaneously control, by one and the same rotary knob 1, two air flaps or two other arbitrary adjustment elements. The targeted conformation of the slots 11, 22 of the two cylinders 5, 20 allows any ratio of

  desired transmission for each of the two movements

  ness, independently of each other, so that the translation of the soul of a cable may be greater than

  that of the soul of the other cable for the same angle of rotation

button, for example.

  It goes without saying that the skilled person can realize

  in addition to the examples described above, other forms of the mechanical motion conversion device according to the invention. In addition to the use described

  as an example of the rotation connection as the

  motion and translation fitting

  as the output side of a movement, the convergent

  sion is also usable for uses providing a direction of reverse motion transmission, that is to say with application of a linear motion at the entry and exit of a rotation. Apart from automotive heating or air-conditioning systems, the motion conversion unit is usable wherever a motion conversion has to be reliably performed in a confined space and with little clearance between

  a rotating movement and at least a linear movement.

Claims (6)

  A mechanical motion conversion member, comprising a rotation coupling (1a) and a linear motion coupling (8c), characterized by a cylinder (5) coupled to the rotation coupling (1a) and   rotatably supported on a base body (6), which pre-   has on its side wall (5c) a first guide element (11), and   a sliding element (8) coupled to the transmission coupling   (8c) and supported axially movably on the   basic body, which has a second element of guiding   step (8d, 8a) cooperating with the first,   the two cooperating guiding elements (8d, 8e;   ending on the paroilateral of the cylinder a guide path having an axial direction component   and a circumferential direction component.   A motion conversion member according to claim 1, further characterized in that - the guide member of the cylinder (5) comprises at least one   least one guide groove (11), the layout of which   a component of axial direction and a component   circumferential direction and the sliding element (8) has a cylindrical side wall (8a) coaxially adjacent the cylinder, internally or externally, on which at least one guide pin (2) is arranged as a second guide element ( 8d, 8e) engaged in the   corresponding guide groove of the cylinder.   A motion conversion member according to claim 1 or 2, further characterized in that the guide path defined by the two cooperating guiding elements (8d, 8e; 11) of the cylinder (5) and the sliding member (8), forms a closed peripheral path (la) itself or is composed of several mutually offset guide path portions (11b, 11c).   parallel in the circumferential direction.   4. Motion conversion member according to a   Claims 1 to 3, further characterized by   cooperating guiding elements (8d, 8e; 12a, 12b) on the sliding element (8) on the one hand and on the base body (6) on the other hand for axial mobility guiding   of the sliding element on the basic body, the elements   co-operating guidance devices defining a guiding   axially drawn which is bent in the circumferential direction   in at least one of its two terminal portions. 5. Motion conversion member according to   one of claims 2 to 4, further characterized in that   the cylinder (5) is received coaxially in a base body bushing (6) which has at least one guide groove (12a, 12b) extending   axially as a guiding element for the guiding   with axial mobility of the sliding element (8), and the sliding element (8) is received in the cylinder so that its cylindrical side wall (8a) is coaxially adjacent to the side wall (5c) of the cylinder; the guide element of the sliding element (8) being formed by at least one guide pin (8d, 8e)   radially protruding outward from its   cylindrical lateral king (8a), tenon which passes through a guide groove of the cylinder (5) made as   a guide slot (11) and is engaged in the rai-   guide portion (12a, 12b) of the sleeve forming basic body (6).   A motion conversion member according to claim 5, further characterized by - a second pair of pieces respectively forming a cylinder and a sliding member, second pair which coaxially surrounds the base body bushing (6), - the second cylinder (20) being secured in rotation with the first cylinder (5) and having in its lateral wall at least one guide slot (22) whose path has an axial direction component and a circumferential direction component, and - the second sliding element (21) having a   second connection of linear movement or transla-   movement member (24) and at least one guide pin (23)   radially protruding inwards, tenon which   the corresponding guide slot (22) of the   cylinder and engages in a guide groove (28) which is coordinated and arranged with a path   axial in the base body sleeve (6).