FR3044063A1 - "ARRANGEMENT FOR THE INTERNAL CONTROL OF SELECTION OF A GEARBOX WITH SELECTION ACTUATOR, AND ASSOCIATED GEARBOX" - Google Patents

Abstract

The invention provides an arrangement which comprises an axially slidable rotary selection control member (10), an elastic return means of the control member to a first angular position of selection, a controlled actuator which applies a control force to the control member to cause its rotation from its first selection position to a second angular position, against the return force, characterized in that it comprises a fixed radial finger (42) and a grid mobile device (40), carried by the control member (10), in which the fixed finger is received and comprising a radial groove (RL) in which the finger moves in both directions and at least one axial groove (AL2) which is connected to one end of the radial groove and in which the fixed finger (42) moves in both directions, and in that the axial groove (AL2) is delimited by an axial face (54-2) against which the fixed finger (42) is angular support under the action of the elastic return means and in the absence of control force applied by the actuator.

Description

"Arrangement for the internal selection control of a gearbox with selection actuator, and associated gearbox"

TECHNICAL FIELD OF THE INVENTION The invention relates to an arrangement for the internal control of the selection of report lines in a mechanical gearbox. The invention more particularly relates to an arrangement comprising a controlled actuator which can apply a control force to cause the selection of at least two lines of reports.

STATE OF THE ART The invention relates to an arrangement of the type described and represented in French Patent Application No. 14 59546 of October 6, 2014.

In this type of arrangement or control device, there is provided a selection control member which is rotatably mounted, in both directions, between at least a first and a second angular position of selection each of which is associated with a first selection line and a second selection line respectively. The control member, or a component connected to it, is mounted to slide axially in both directions, when the control member occupies one or the other of the first or second angular positions of selection for, for example under the action of a controlled actuator, causing the passage of one or other of the reports associated with the previously selected selection line.

There is also provided a means of elastic return of the control member to its first angular position of selection and a controlled actuator which can apply a control force to the control shaft to cause its rotation from its first angular position of selection towards its second position, against the return force exerted by the elastic return means.

In such a design, which will be explained in more detail later, when the second selection line has been selected by controlling the actuator, against the elastic return force, and that the force applied by the actuator has been released, there are friction between elements connected to the control member and members fixed relative thereto under the load applied by the elastic return force - which are likely to cause phenomena axial blocking, or even to prevent the return to the neutral position with selection of the first row of reports again. The object of the invention is to propose a new arrangement making it possible to control these friction forces by residual contacts, in particular to limit the contacting surfaces in order to reduce axial sliding drag and jamming or blocking phenomena.

BRIEF SUMMARY OF THE INVENTION

For this purpose, the invention proposes an arrangement of the type mentioned above, characterized in that it comprises: a fixed finger which extends in a radial direction with respect to the axis of rotation and sliding of the organ control ; a movable gate, carried by the control member, in which the fixed finger is received and which comprises: a radial groove in which the fixed finger moves angularly in both directions, when the control member rotates; between the first and second angularly offset angular positions; and - at least one axial groove which is connected to one end of the radial groove and in which the fixed finger moves, in both directions, when the control member is in its second angular position and moves axially, in both ways ; and - said axial groove is delimited by an axial face against which the fixed finger is in angular support under the action of the elastic return means and in the absence of control force applied by the actuator.

According to other features of the invention: the movable gate is an "H" gate which comprises another axial groove which is connected to another end of the radial groove and in which the fixed finger moves in both sense, when the control member is in its first angular position and moves axially in both directions; - A cylindrical portion free end of the fixed finger is received in the grooves of the movable gate, and the width of each groove is substantially equal to the diameter of said cylindrical end free end; the zone of connection of the radial groove with an axial groove comprises connecting chamfers; - The control member comprises a block which extends radially outwardly, and the movable gate is formed in the peripheral circumferential face of the block; - This block is made in one piece by molding with the control member. The invention also proposes a gearbox comprising a housing and an arrangement according to the invention, characterized in that the fixed finger is connected to the casing of the gearbox.

BRIEF DESCRIPTION OF THE FIGURES Other features and advantages of the invention will emerge during the reading of the following detailed description for the understanding of which reference will be made to the appended drawings in which: FIG. 1 is a perspective view a selection control arrangement according to an example of the state of the art; FIG. 2 is a view of the arrangement of FIG. 1 according to an angle of view; FIGS. 3A to 3C are detailed views of a portion of FIG. 1 which illustrate various angular and axial positions of the components; - Figure 4 is a view similar to that of Figure 2 which illustrates an embodiment of a selection control arrangement according to the invention; - Figure 5 is an enlarged detail view of the gate of the control member of the arrangement shown in Figure 4; - Figure 6A is a sectional view along a median vertical plane passing through the radial groove of the gate, in the position shown in Figure 4; - Figure 6B is a view similar to that of Figure 6A which shows the same components in the other angular position of selection; and FIGS. 7A to 7F are diagrams illustrating the different displacements of the fixed finger in the mobile grid.

DETAILED DESCRIPTION OF THE FIGURES

In the remainder of the description, elements having identical structure or similar functions will be designated by the same references.

In the remainder of the description, longitudinal, vertical and transverse orientations indicated by the "L, V, T" trihedron of the figures will be adopted in a nonlimiting manner and without reference to earth gravity. We also define a horizontal plane that extends longitudinally and transversely. FIG. 1 shows an internal control arrangement belonging to a mechanical gearbox which, in known manner, essentially comprises a control member 10 which is mounted axially movable in both directions along a longitudinal geometric axis A, and which is also rotatably mounted, or pivoting, in both directions about this same axis A.

The first angular position, said first selection position, and illustrated in particular in Figures 1 and 2, is determined by a tab 14 of radial orientation belonging to the control member 10 which cooperates with fixed elements angular abutment belonging for example to the casing of the box. The control member 10 is resiliently biased towards its first position by an elastic return means 16 which is here embodied in the form of a wire spring whose branch 18 is driven by a finger 20 of the lug 14 when the control member 10 is rotated in the direction S indicated in FIGS. 1 and 2.

For its drive in rotation in the direction S, against the return force applied to it by the spring 16, the control member 10 comprises a radial actuating tab 22 which comprises an actuating plate 24 which extends in a plane parallel to the axis A.

To act on the face 26, there is provided a controlled actuator 28 which is for example a solenoid electromagnetic cylinder whose output rod 30, or actuating rod, is slidably mounted along a geometric axis B which is generally orthogonal to the plane of the actuating surface 26 and which extends in a radial plane orthogonal to the axis A.

When the actuator 28 is controlled and supplied with current, the actuating rod 30 moves along the axis B to push on the actuating plate 24 and cause rotation, in the direction S, of the control member towards its second angular position of selection illustrated in particular in FIG. 3A.

When the control and the power supply to the power supply of the actuator 28 are interrupted, the actuating rod 30 exerts no more effort and the control member 10 is elastically biased under load, by the return spring 16, towards its first angular position.

To allow the passage of different ratios, in one or other of the two selection lines previously selected, there are provided two radial passage arms 32-1 and 32-2 which rotate in both directions and move axially with the control member 10.

In the first selection position, it is the first radial passage arm 32-1 which is received in a dog clutch 34-1 connected, in known manner, to a first gear line of the gearbox.

In this first position, the second passage arm 32-2 is disengaged from a second associated clutch 34-2 itself, in known manner, connected to a second line of sprockets of the box.

As can be seen in FIG. 3A when, under the action of the actuator 28, the control member 10 has pivoted angularly from its first angular position of selection towards its second angular position of selection, the first passing arm 32-1 is disengaged circumferentially out of the first dog 34-1 while, in turn, the second arm 32-2 is engaged in the second clutch 34-2.

Finally, the arrangement comprises a component called interlocking key which is rotatably mounted with the control member 10 and which comprises two locking blocks 36-1 and 36-2, each of which cooperates alternately with its clutch 34-1 , 34-2 associated to block it when the corresponding selection line is not selected.

Starting from the second angular position of selection illustrated in FIG. 3A, it is possible (as represented in FIGS. 3B and 3C) to axially move the control member 10 in both directions so as to cause passage actions. or commitment of reports. As soon as an engagement has been caused in either axial direction, the selection force applied by the actuator 28 can be released on the member 10.

As a result, the first passage arm 32-1 is then circumferentially supported against surface portions vis-à-vis 38-1 of the first clutch 34-1, and this under load of the return spring 1 6.

The axial displacements of the control member 10 are thus braked, or even blocked, by these friction forces generated between the surfaces in contact 38-1 of the first clutch 34-1 with the portion facing the face 33. -1 of the first arm 32-1.

As illustrated from FIG. 4, in order to control and significantly reduce the axial forces of residual friction that have just been explained, the arrangement according to the invention comprises a movable grid 40 and a fixed finger 42 received in the mobile grid 40.

In the example illustrated in the figures, the friction control finger 42 extends radially along an axis C and is carried by a body 44 which is fixed in a housing 46 of a portion 48 of the housing of the box. speeds.

The finger 42 is thus fixedly mounted relative to the movable control member 10.

The control grid 40 is formed at the peripheral radial end of a block 50 which is here produced integrally by molding with the control member 10.

The gate is formed in the radial end face 52 of the block 50 which is a cylindrical surface arc portion centered on the axis A.

The movable gate 40 has here a general shape of "H" and it comprises two parallel axial grooves AL1 and AL2 each of which is here connected to the other substantially in its middle, by a radial groove RL.

Each axial groove AL1, AL2 is delimited circumferentially by two generally parallel longitudinal faces 54-1, 56-1 and 54-2, 56-2 respectively, while the radial groove RL is delimited by two opposite faces 58.

The connection areas between the faces 54-1, 54-2 and the faces 58 are here made using chamfers 60-1 and 60-2. It is the free end section in the form of a cylindrical rod C axis of the control finger 42 which is received in the grid 40 and which is able to move there, with a slight clearance, in the various lines. function of the relative displacements of the control member 10 relative to the fixed casing 48.

As can be seen in Figures 7A-7F, the possibilities of displacement are as follows.

When the first gear line is selected, the finger 42 is located in the first axial groove AL1 from the central neutral position shown in Figure 7A in which it is also opposite the radial groove RL.

As illustrated in FIGS. 7B and 7C, the finger 42 can move longitudinally to the left or right in the first longitudinal groove AL1.

Starting from the position shown in FIG. 7A, if the actuator 28 causes the selection of the second ratio line, the finger 42 moves in the radial groove RL to come into the second axial groove AL2 in which it can move. , to the left or to the right, as illustrated in FIGS. 7E and 7F, corresponding to the displacements associated with FIGS. 3B and 3C.

In each of the positions illustrated in FIGS. 7E and 7F, when the force applied by the actuator 28 is released, the cylindrical portion of the finger 42 will come into contact and bear under load, by its external convex cylindrical surface 43, against the opposite face 54-2.

Thus, this contact is linear or quasi-linear with very low friction forces during axial displacements.

In addition, the geometric positioning of the finger 42 relative to the grid 40, with respect to the passage arms 32-1, 32-2, and to the jaws 34-1, 34-2 are such, as can be seen in particular in FIG. Figure 6B, that there is then more contact between the surfaces 33-1 and 38-1. All of the description that has just been made and the definition of the invention given in the claims provide that the gate 40 is movable and the finger 42 is fixed.

Without departing from the scope of the invention, it is possible to mechanically invert the arrangement of the grid 40 which can then be fixed or formed with the housing 48 to be a fixed grid, while the control finger 42 is then realized with the control member 10, or fixed on the latter, to extend radially and be movable with the control member 10 while being of course then received in the fixed control grid 40.

Claims (7)

An arrangement for the internal control of the selection of gear lines in a gearbox which comprises: - a selection control member (10) which is mounted: - rotatable, in both directions, between at least a first gear and a second selection angular positions each of which is associated with a first selection line and a second selection line respectively; and - sliding axially in both directions, when the control member (10) occupies one or the other of said first or second angular positions of selection; - means (16) of elastic return of the control member (10) to its first angular position of selection; - a controlled actuator (28) which can apply an actuating force to the control member (10) to cause its rotation, from its first selection angular position to its second position, against the effort of return biased by the elastic return means (16), characterized in that the arrangement comprises: - a fixed finger (42) which extends in a radial direction relative to the axis of rotation and sliding (A) the control member (10); a movable gate (40), carried by the control member (10), in which the fixed finger (42) is received and which comprises: a radial groove (RL) in which the fixed finger (42) is moves, angularly in both directions, when the control member (10) rotates between the first and second angular positions; and - at least one axial groove (AL2) which is connected to one end of the radial groove (RL) and in which the fixed finger (42) moves, in both directions, when the control member (10) is in its said second angular position and moves axially in both directions; and in that said at least one axial groove (AL2) is delimited by an axial face (54-2) against which the fixed finger (42) bears angularly under the action of the elastic return means (16) and in the absence of control force applied by the actuator (28). 2. Arrangement according to the preceding claim, characterized in that the movable grid (40) is an "H" grid which comprises another axial groove (AL2) which is connected to another end of the radial groove (RL) and in which the fixed finger (42) moves, in both directions, when the control member (10) is in its said first angular position and moves axially in both directions. 3. Arrangement according to any one of the preceding claims, characterized in that a cylindrical portion of free end (43) of the fixed finger (42) is received in the grooves (RL, AL1, AL2) of the movable gate ( 40), and in that the width of each groove is substantially equal to the diameter of said cylindrical free end section. 4. Age ncement according to any one of the preceding claims, characterized in that the zone of connection of the radial groove (RL) with an axial groove (AL1, AL2) comprises connecting chamfers (60-1, 60-2 ). 5. Arrangement according to any one of the preceding claims, characterized in that the control member (10) comprises a block (50) which extends radially outwards, and in that the movable gate (40) is formed in the peripheral circumferential face (52) of the block (50). 6. Arrangement according to the preceding claim, characterized in that said block (50) is formed in one piece by molding with the control member (10). 7. Gearbox comprising a housing and an arrangement according to any one of the preceding claims, characterized in that the fixed finger (42) is fixed to the housing (48) of the gearbox.