TAILSTOCK OFF-AXIS DEVICE AND ASSOCIATED TEST BENCH

Abstract

The invention relates to a set of parts intended to form a device for offsetting a tailstock (1), said tailstock (1) comprising a frame (2), characterized in that said set of parts comprises a first part (3) of conical external shape having a first bore (7a), a second part comprising a first base (4a) having a second bore (7b) and a first shaft (4b), a third part (5) of cylindrical external shape having a third bore (7c), and a fourth part comprising a second base (6a), a second shaft (6b) and a rotating center (6c). The invention also relates to a device comprising said set and a test bench comprising such a device. Figure 1

Description

Title of the invention: DEVICE FOR OFF-AXISING A TAILSTOCK AND ASSOCIATED TEST BENCH

[0001] The invention relates to the control of parts and more particularly to the control of meshing causing acoustic and vibration defects.

[0002] Known from the prior art is a French patent application FR3126494 describing a test bench configured to test a damper of a helicopter rotor. A damper is subjected to various physical constraints. It is therefore necessary to test this damper on a test bench before integrating it into said rotor. The test bench is a machine on which tests are carried out on parts in order to know if they have the expected priorities for their function when they are integrated into a suitable device. The test bench comprises a first support which undergoes rotation around a first axis, the rotation being made possible by a motor. The test bench comprises a second support rotating around a second axis. The second axis is offset from the first axis. The test bench comprises a first connector secured to the first support and a second connector secured to the second support.The first connector and the second connector are arranged opposite each other along an arrangement axis. The damper comprises a first end piece and a second end piece. The first end piece is fixed to the first connector and the second end piece is fixed to the second connector. In this way, said damper is arranged on the arrangement axis. However, disadvantages remain. Firstly, such a test bench no longer allows parts to be checked in a conventional manner, i.e. without misalignment. A second conventional test bench will therefore be necessary to carry out these checks. The first axis and the second axis are not coaxial. There is therefore only one misalignment, which reduces the precision of the part check.

[0003] The objective of the present invention is to remedy these drawbacks by proposing a device for misaligning a tailstock to deliberately and precisely offset gears during a meshing test.

[0004] To achieve this objective, the invention proposes a set of parts intended to form a device for offsetting a tailstock, said tailstock comprising a frame, and said set of parts comprising a first part of conical external shape having a first bore, a second part comprising a first base having a second bore and a first shaft, a third part of cylindrical external shape having a third bore, and a fourth part comprising a second base, a second shaft and a rotating center.

[0005] Advantageously, said first base and said second base have a cylindrical shape.

[0006] Advantageously, said first base and said second base comprise engravings whose angular spacing is between 0.5 degrees and 180 degrees.

[0007] Thus, it is possible to know precisely the relative position of the part with respect to the device.

[0008] Furthermore, the invention relates to a device for offsetting a tailstock, said device comprising the set of parts previously described, said second shaft is inserted into said third bore, said third part is inserted into said second bore, said first shaft is inserted into said first bore, said first part is intended to be inserted into said tailstock, said device having a first longitudinal axis, the first bore being centered relative to the first axis, the second bore and the third bore being off-center relative to the first axis.

[0009] Thanks to the invention, it is possible to check a part before its assembly. This saves time for the technicians responsible for assembling said part.

[0010] Advantageously, the first part is fixed to the frame by at least two clamping screws and the third part is fixed to the first base by at least two clamping screws.

[0011] Preferably, the first part is fixed to the frame by four clamping screws and the third part is fixed to the first base by four clamping screws.

[0012] In this way, said device has a stable position despite the vibrations generated by the misalignment.

[0013] Advantageously, said second bore comprises a second longitudinal axis, said second axis being parallel to the first axis, the second axis being at a distance of between 0.1 cm and 1 cm from the first axis.

[0014] Advantageously, said third bore comprises a third longitudinal axis, said third axis being parallel to the first axis, the third axis being at a distance of between 0.5 cm and 2 cm from the first axis.

[0015] Preferably, said device has a length of between 5 cm and 25 cm.

[0016] Thus, the device is suitable for a wide range of workpieces.

[0017] The invention also relates to a test bench configured for meshing control comprising said device for misaligning a tailstock described above.

[0018] The invention will be further detailed by the description of a non-limiting embodiment, and on the basis of the appended figure illustrating the invention, in which [Fig.l] schematically illustrates a device for offsetting a tailstock according to an embodiment of carrying out the invention.

[0019] [Fig.l] schematically illustrates a device for offsetting a tailstock 1. The device has a first longitudinal axis A. The tailstock 1 is an element serving as a support for a part that is to be machined. Said device comprises a set of parts. The set of parts comprises a first part 3. The first part 3 has a conical shape. The first part 3 comprises a first bore 7a whose axis is coaxial with respect to the first axis A when said set of parts are assembled to form said device. In other words, said first bore 7a is centered with respect to the first axis A. The set of parts further comprises a second part comprising a first base 4a and a first shaft 4b. In [Fig.l], the set of parts is represented in the form of the device, that is to say that the parts are assembled. Thus, the first shaft 4b is inserted into the first bore 7a of the first part 3.Preferably, said first base 4a has a cylindrical shape. The first base 4a comprises a second bore 7b. The second bore 7b is off-center with respect to the first axis A. Preferably, the second bore 7b comprises a second longitudinal axis B parallel to the first axis A. The second axis B is at a distance of between 0.1 cm and 1 cm from the first axis A. Thus, a first misalignment is created. The first misalignment makes it possible to create an imbalance which is useful for simulating a fault in positioning or maintaining a part in position. The first misalignment causes acoustic defects and vibrations. The set of parts comprises a third part 5. The third part 5 has a cylindrical shape. The third part 5 is inserted into the second bore 7b of the first base 4a. The third part 5 comprises a third bore 7c off-center with respect to the first axis A.Preferably, the third bore 7c has a third longitudinal axis C parallel to the first axis A. The third axis C is at a distance of between 0.5 cm and 2 cm from the first axis A. In this way, a second offset is created. The second offset allows greater freedom in the movements of said device. Thus, the second offset makes it possible to control a part more precisely. Advantageously, the first part 3 is fixed to the tailstock 1 by at least two clamping screws and the third part 5 is fixed to the first base 4a by at least two clamping screws. Preferably, the first part 3 is fixed to the tailstock 1 by four clamping screws and the third part 5 is fixed to the first base 4a by four clamping screws. Finally, the set of parts comprises a fourth part. The fourth part comprises a second base 6a, a second shaft 6b and a tip 6c. Preferably, the second base 6a has a cylindrical shape.The second shaft 6b is inserted into the third bore 7c of the third part 5. The tip 6c is capable of undergoing a rotational movement. Advantageously, the device has a length . between 5 cm and 25 cm in order to be suitable for a test bench and for the control of a wide range of parts to be machined. In addition, in order to know precisely the relative positions of each part with respect to the device, each part of the set of parts can have engravings whose angular spacing is between 0.5 degrees and 180 degrees. Preferably, the first base 4a and the second base 6a have said engravings. A vernier device, whose resolution is between 0.5 degrees and 1 degree, can also be added in order to finely adjust the angular position. The invention also relates to a test bench configured for mesh control comprising said misalignment device. The use of the device in such a test bench makes it possible to anticipate defects due to poor assembly.In this way, the inspected part can be corrected directly before it is assembled in a motor vehicle, for example. This device thus saves considerable time for the technicians responsible for assembling the part in question.

Claims

Claims

1. Set of parts intended to form a device for offsetting a tailstock (1), said tailstock (1) comprising a frame (2), characterized in that said set of parts comprises a first part (3) of conical external shape having a first bore (7a), a second part comprising a first base (4a) having a second bore (7b) and a first shaft (4b), a third part (5) of cylindrical external shape having a third bore (7c), and a fourth part comprising a second base (6a), a second shaft (6b) and a rotating center (6c).

2. Set of parts according to one of claim 1 characterized in that said first base (4a) and said second base (6a) have a cylindrical shape.

3. Set of parts according to claim 2 characterized in that said first base (4a) and said second base (6a) comprise engravings whose angular spacing is between 0.5 degrees and 180 degrees.

4. Device for offsetting a tailstock (1), said device comprising the set of parts according to any one of claims 1 to 3 characterized in that said second shaft (6b) is inserted into said third bore (7c), said third part (5) is inserted into said second bore (7b), said first shaft (4b) is inserted into said first bore (7a), said first part (3) is intended to be inserted into said tailstock (1), said device having a first longitudinal axis (A), the first bore (7a) being centered relative to the first axis (A), the second bore (7b) and the third bore (7c) being off-center relative to the first axis (A).

5. Device according to claim 4 characterized in that the first part (3) is fixed to the tailstock (1) by at least two clamping screws and the third part (5) is fixed to the first base (4a) by at least two clamping screws.

6. Device according to claim 5 characterized in that the first part (3) is fixed to the tailstock (1) by four clamping screws and the third part (5) is fixed to the first base (4a) by four clamping screws.

7. Device according to any one of claims 4 to 6 characterized in that said second bore (7b) comprises a second axis (B) Ion- horizontal, said second axis (B) being parallel to the first axis (A), the second axis (B) being at a distance of between 0.1 cm and 1 cm from the first axis (A).

8. Device according to any one of claims 4 to 7 characterized in that said third bore (7c) comprises a third longitudinal axis (C), said third axis (C) being parallel to the first axis (A), the third axis (C) being at a distance of between 0.5 cm and 2 cm from the first axis (A).

9. Device according to any one of claims 4 to 8 characterized the distance between the tip (6c) and the first part (3) is between 5 cm and 25 cm.

10. Test bench configured for gear control comprising said device according to any one of claims 4 to 9.

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