FR3121506A1 - DEVICE FOR CONTROLLING THE SHAPE OF A TRIAXIS COMPRISING AT LEAST ONE ELLIPTICAL SURFACE - Google Patents

Abstract

The invention relates to a device for controlling the shape of a triax (20) comprising at least one elliptical profile, the device comprising a contour apparatus (2) able to control the shape of a contour by moving a feeler (3) along a displacement axis (D) substantially perpendicular to the feeler (3) and a support (4) able to immobilize a triax facing the contour device (2), where the support (4) comprises a first shaft horizontal axis and a wedge so as to present an elliptical profile to the feeler (3) and in that the contour device (2) comprises a reference profile of the elliptical profile in order to compare the elliptical profile felt with the reference profile. Figure 5

Description

DEVICE FOR CONTROLLING THE SHAPE OF A TRIAXIS COMPRISING AT LEAST ONE ELLIPTICAL SURFACE

The invention relates to a form control device. This device is applicable to the control of a surface having an elliptical profile. More particularly, the device is applicable to a triax comprising at least one surface having an elliptical profile.

It is known to control the quality of a flat or circular surface by means of a contour device. Such a contour device comprises a feeler capable of coming into contact with the surface to be checked. This feeler typically includes a ball mounted at the end of a measuring rod. The contour device is capable of moving the feeler in a direction of movement substantially perpendicular to the measuring rod. During this movement, the contour device ensures that the feeler is kept in contact with the controlled surface, and measures the movement of the feeler in a measurement direction aligned with the measuring rod. The measuring device thus makes it possible to record a profile of the profile followed on the surface, parallel to the direction of displacement. This profile can then be compared with a reference profile: rectilinear for a flat surface, circular for a spherical surface.

Such a contour device is initially not intended to control an elliptical surface profile.

A triax is a new part. A triaxle comprises a hub pierced with a bore along a first axis and three radial studs arranged along three coplanar axes in a plane perpendicular to the first axis. The tenons are angularly evenly distributed around the first axis and each comprise two surfaces, symmetrical to each other relative to the axis of the tenon and each surface has an elliptical profile centered on the axis of the tenon. Such a triax is provided to reduce vibration.

It is advisable to propose a support able to immobilize a triax so that it has at least one elliptical surface opposite the feeler of the contour device so that the latter can control said elliptical surface.

For this, the subject of the invention is a device for controlling the shape of a triax comprising a hub pierced with a bore along a first axis and three radial studs arranged along three coplanar axes in a plane perpendicular to the first axis and angularly evenly distributed. around the first axis, each tenon comprising two surfaces, symmetrical to each other relative to the axis of the tenon, each surface having an elliptical profile centered on the axis of the tenon, the device comprising a contour device capable of control the shape of a contour by moving a feeler substantially normal to the contour along an axis of movement substantially perpendicular to the feeler and a support able to immobilize a triax facing the contour device, where the support comprises a first shaft horizontal axis capable of receiving the bore of a triax and a wedge capable of supporting a tenon so that its axis is horizontal in order to present an elliptical profile to the feeler and in c e that the contour device includes a reference profile of the elliptical profile in order to compare the palpated elliptical profile with the reference profile.

Particular characteristics or embodiments, which can be used alone or in combination, are:
- the support also comprises a second shaft with a horizontal axis, coplanar and perpendicular to the axis of the first shaft and the wedge is arranged in a vertical plane bisecting the axis of the first shaft and the axis of the second shaft,
- the section of the first shaft is shaped in such a way that the first shaft / bore assembly is adjusted while allowing the hub of the triaxle to rotate freely and/or the section of the second shaft is shaped in such a way that the second shaft/bore assembly is adjusted while allowing the triaxle hub to rotate freely,
- the first shaft has a square section with rounded edges and/or the second shaft has a square section with rounded edges,
- the support also includes a measuring rod capable of pressing vertically downwards against the triaxial in order to maintain a tenon pressed against the wedge,
- the measuring rod is rotatable around a vertical axis disposed in a vertical plane bisecting the axis of the first shaft and the axis of the second shaft.

The invention will be better understood on reading the following description, given solely by way of example, and with reference to the appended figures in which:

shows, in perspective view, a triaxe,

shows, in front view, the triaxis of the ,

shows in bottom view, the triaxis of the ,

shows the definition chart for the reference elliptical profile,

shows an overview of the control device, controlling a triax,

shows, in perspective view, a support.

The invention relates to a device 1 for controlling the shape of a surface having an elliptical profile and more particularly suitable for controlling a triax 20.

As illustrated in Figures 1-3, a triaxle 20 comprises a hub 21. This hub 21 is pierced with a bore 22 along a first axis X. The triaxle 20 further comprises three studs 23-25 radially arranged around the hub 21 along three coplanar axes A1, A2, A3 in a YZ plane perpendicular to the first axis X. The three axes A1, A2, A3 are angularly evenly distributed around the first axis X. Each tenon 23-25 comprises two surfaces 26-31, symmetrical l one from the other relative to the axis A1, A2, A3 of the tenon 23-25. Stud 23 carries both surfaces 26, 27. Stud 24 carries both surfaces 28, 29. Stud 25 carries both surfaces 30, 31. In the illustrated triax 20, surfaces 26-31 are centered on the YZ plane . Each surface 26-31 has the shape of an ellipsoid centered on the axis A1, A2, A3 of the tenon 23-25. Also, each of the surfaces 26-31 has a first elliptical profile in a plane perpendicular to the axis A1, A2, A3 of the tenon 23-25 and a second elliptical profile in the YZ plane, perpendicular to the first. Such a triax is advantageously a motor vehicle transmission element, provided to reduce vibrations in the transmission.

The device 1 according to the invention is able to control both the first and the second elliptical profile, thanks to an advantageously designed support.

As illustrated at , the control device 1 comprises a contour device 2. This contour device is able to control the shape of a contour by moving a feeler 3, placed at the end of a measuring rod, here rectilinear aligned with a vertical measurement axis. The ball forming feeler 3 is arranged at the bottom of the measuring rod so as to come into contact with the contour to be checked from above. The contour device 2 maintains a slight pressure downwards, so that the probe remains in contact with the contour to be checked. The measuring rod remains substantially normal to the contour to be checked.

The feeler 3 and the measuring rod are moved by the contour device 2 along an axis of movement D substantially perpendicular to the measuring rod carrying the feeler 3. On the , the direction D is horizontal and in the plane of the figure.

The device 1 also comprises a support 4, more particularly visible at the . The support 4 is able to immobilize a triaxle 20 so that the triaxle 20 presents an elliptical profile to the feeler 3 by aligning it with the direction D of displacement, both the first elliptical profile and the second elliptical profile.

For this the support 4 comprises a main body. This main body carries a first shaft 5. This first shaft 5 extends from the main body along a horizontal axis 6. The shaft 5 is shaped so as to be able to accommodate the bore 22 of a triaxle 20. Also, it has a section, substantially constant along its axis 6, strictly included in the section of the bore 22. The support 4 further comprises a wedge 9. This wedge 9, substantially vertical, comprises a substantially flat upper surface, or any other shape, capable of supporting a tenon 23-25 in gravity support on said upper surface. The height of the wedge 9 and its position relative to the first shaft 5 are determined so that a triaxle 20 whose bore 22 is engaged on the first shaft 5 has a tenon 23-25 which rests on the wedge 9, and that the axis A1, A2, A3 of said tenon 23-25 placed, is arranged substantially horizontally. This allows the tenon 23-25 to present one of its surfaces 26-31 facing the contour device 2, so as to align one of its elliptical profiles with the axis of movement D of the contour device 2.

It has been seen that a contour device 2 is designed to control a planar profile or a circular profile. It is not a priori intended to control an elliptical profile. Also, according to a characteristic of the invention, the contour device 2 has been modified to respond to this new functionality. For this, the contour device 2 has learned a new function. He is provided with a reference profile E of the desired nominal elliptical profile. Such an E profile is shown in . It is defined in polar coordinates or in Cartesian coordinates, in the tracking system used by the contour device 2 to record a measured profile. Thus, the contour device 2 is able to compare an elliptical profile measured by the feeler 3 with a reference profile E. This makes it possible, by matching the comparison of the two profiles with an acceptable tolerance, to give a pass/pass result not.

According to another characteristic, the support 4 further comprises a second shaft 7 with axis 8 horizontal. Axis 8 is perpendicular to axis 6 of the first shaft 5. Axis 8 is arranged at the same height as axis 6. The two axes are coplanar in the same horizontal plane. The wedge 9 is arranged, relative to a horizontal plane, in a vertical plane bisecting the axis 6 of the first shaft 5 and the axis 8 of the second shaft 7. Its height is determined, as seen above, relative to the position of the shaft 5, 7, depending on the dimensions of the triaxial 20 so that the tenon 23-25 placed on the wedge 9 has its axis A1, A2, A3 horizontal.

There schematically shows a first triax arranged on the first shaft 5 and a second triax arranged on the second shaft 7, superimposed.

The support 4 being thus shaped, a triaxle 20 can be arranged in two configurations. According to a first configuration, the bore 22 is engaged around the first shaft 5 and a tenon 23-25 is placed on the wedge 9. The triaxle 20 then has, for a first surface 26-31, the second elliptical profile, that in the plane YZ, parallel to the direction D of movement of the contour device 2. According to a second configuration, the bore 22 is engaged around the second shaft 6 and a tenon 23-25 is placed on the wedge 9. The triaxial 20 then has, for the same first surface 26-31, the first elliptical profile, that in the plane perpendicular to the axis A1, A2, A3 of the tenon 23-25, parallel to the direction D of movement of the apparatus of outline 2.

A reversal of the triaxial 20, so as to engage the bore 22 around a shaft 5, 7, by the other opening of the bore 22, makes it possible to present the other surface of the same tenon 23-25.

A rotation of the tri-axis 20, relative to the first axis X, according to two rotations of 120°, makes it possible to present each of the studs 23-25 in the measurement configuration.

The support 4 makes it possible to carry out twelve measurement configurations by combining a change of shaft 5, 7, a reversal of the triaxial 20 and a rotation according to three angular positions modulo 120°, and thus to control, for each of the six surfaces 26-31 its two elliptical profiles, making a total of twelve elliptical profiles.

According to another characteristic, the section of a shaft 5, 7 is shaped so that the engagement of the bore 22 on said shaft 5, 7 is adjusted, while allowing the hub 21 of the triaxle 20 to rotate freely. This makes it possible, on the one hand, to adjust the fitting of a tenon 23-25 on the wedge 9 and, on the other hand, to turn the triax 20 to change the tenon 23-25.

Also, the section of a shaft 5, 7 is strictly inscribed in the section of the bore 22. The section of a shaft 5, 7 can be arbitrary, as long as it has at least three zones capable of coming into contact with bore 22.

According to another characteristic, a shaft 5, 7 preferably has a square section with rounded edges, in order to meet the above constraints.

According to another characteristic, the support 4 further comprises a measuring rod 10. This measuring rod of substantially horizontal extension is capable of pressing vertically downwards against the triaxial axis 20. This ensures that a tenon 23-25 is held in contact against the wedge. 9.

According to another characteristic, the height rod 10 is advantageously rotatably mounted around a vertical axis 11. This makes it possible to turn the height rod 10 to best adapt the fulcrum of the height rod 10 on the triaxis 20. According to another characteristic, the vertical axis 11 is preferably arranged in a vertical plane bisecting the axis 6 of the first shaft 5 and the axis 8 of the second shaft 7. This advantageously allows the height rod 10 to be used, both for a triaxe 20 engaged on the first shaft 5 only for a triaxle 20 engaged on the second shaft 7.

The invention has been illustrated and described in detail in the drawings and the foregoing description. This must be considered as illustrative and given by way of example and not as limiting the invention to this description alone. Many variant embodiments are possible.

1: device,
2: contour device,
3: feeler,
4: stand,
5: first tree,
6: axis,
7: second shaft,
8: axis,
9: wedge,
10: height gauge,
11: axis,
20: triaxial,
21: hub,
22: bore,
23-25: tenon,
26-31: area,
A1, A2, A3: axis,
D: axis of movement,
E: reference profile,
X: axis,
YZ: blueprint.

Claims (6)

Device (1) for controlling the shape of a triaxle (20) comprising a hub (21) pierced with a bore (22) along a first axis (X) and three radial studs (23-25) arranged along three axes ( A1, A2, A3) coplanar in a plane (YZ) perpendicular to the first axis (X) and angularly evenly distributed around the first axis (X), each tenon (23-25) comprising two surfaces (26-31), symmetrical from each other relative to the axis (A1, A2, A3) of the tenon (23-25), each surface (26-31) having an elliptical profile centered on the axis (A1, A2, A3) of the tenon (23-25), the device (1) comprising a contour apparatus (2) capable of checking the shape of a contour by moving a feeler (3) substantially normal to the contour along a displacement axis (D) substantially perpendicular to the probe (3) and a support (4) able to immobilize a triaxe (10) facing the contour device (2), characterized in that the support (4) comprises a first shaft (5) of axis ( 6) horizontal able to accommodate the bore (22 ) of a triaxle (20) and a wedge (9) able to support a tenon (23-25) so that its axis (A1, A2, A3) is horizontal so as to present an elliptical profile to the feeler ( 3) and in that the contour apparatus (2) comprises a reference profile (E) of the elliptical profile in order to compare the elliptical profile felt with the reference profile (E). Device (1) according to claim 1, wherein the support (4) further comprises a second shaft (7) with an axis (8) horizontal, coplanar and perpendicular to the axis (6) of the first shaft (5) and where the wedge (9) is arranged in a vertical plane bisecting the axis (6) of the first shaft (5) and the axis (8) of the second shaft (7). Device (1) according to any one of Claim 2, in which the section of the first shaft (5) is shaped in such a way that the first shaft (5)/bore (22) assembly is fitted while allowing free rotation the hub (21) of the triaxle (20) and/or the section of the second shaft (7) is shaped in such a way that the second shaft (7)/bore (22) assembly is adjusted while allowing the hub (21) of the triaxle (20). Device (1) according to any one of claims 2 to 3, wherein the first shaft (5) has a square section with rounded edges and/or the second shaft (7) has a square section with rounded edges. Device (1) according to any one of Claims 2 to 4, in which the support (4) further comprises a measuring rod (10) able to press vertically downwards against the triax (20) in order to hold a tenon (23-25 ) leaning against the wedge (9). Device (1) according to Claim 5, in which the measuring rod (10) is rotatable around a vertical axis (11) arranged in a vertical plane bisector of the axis (6) of the first shaft (5) and of the axis (8) of the second shaft (7).