Wheel rotation speed sensor.

Abstract

The invention relates to a sensor (1) designed to be inserted into a bore of a wheel support for measuring the rotational speed of a wheel. The sensor (1) has an insert (4) designed to be inserted into the bore and extending to an end (5) adapted to measure the rotational speed of a rotating element of the support. The sensor (1) has a stop (6) designed to bear against the support when the insert (4) is inserted into the bore with the end (5) positioned to allow measurement of the rotational speed of the element. The sensor (1) has clipping means (11) designed to secure the sensor (1) in the support when the stop (6) is bearing against the support, in cooperation with additional clipping means provided on the support. The invention also relates to the support having a bore and additional clipping means. (Figure 1)

Description

Title of the invention: Wheel rotation speed sensor.

[0001] The technical field relates to wheel rotation speed sensors, wheel supports designed to allow the attachment of such a speed sensor and vehicles having at least one such support.

[0002] The operation of a vehicle, such as its braking or its trajectory, currently uses measurements of the rotational speed of the vehicle's wheels. These measurements are delivered by rotational speed measuring devices mounted on the wheels, generally referred to as "ABS sensors". Conventionally, an ABS sensor typically uses an encoder disc mounted on the axle of a wheel of the vehicle and comprising a plurality of alternating north and south magnetic poles. The ABS sensor is generally mounted on the wheel spindle opposite the encoder disc. The ABS sensor houses a printed circuit board on which a Hall effect cell is mounted. This cell produces an electric current as a function of the variations in the magnetic field generated by the alternating passages in front of the ABS sensor of the north and south poles of the disc driven in rotation by the axle.The ABS sensor therefore functions as a magnetic encoder of the wheel rotation speed.

[0003] The ABS sensor is generally housed in a bore allowing the Hall effect cell to be positioned appropriately relative to the encoder disc. The ABS sensor is then fixed to the stub axle using a fixing screw.

[0004] Experience shows that such an ABS sensor has several disadvantages. Firstly, fixing the ABS sensor is laborious since it requires the screwing of at least one fixing screw. This screwing operation can be all the more difficult when it is a maintenance operation of an assembled vehicle for which each fixing screw is located in an environment complicating its accessibility. Then, such an ABS sensor is relatively sensitive to vibrations and extreme stresses.

[0005] The present invention aims to overcome the problems set out above. In this technical context, one aim of the present invention is to provide a speed sensor allowing easier fixing and guaranteeing better durability.

[0006] To this end, the present invention relates to a wheel speed sensor designed to be inserted into a bore of a wheel support to measure the rotational speed of a wheel, the sensor having an insert designed to be inserted into the bore and extending to a measuring end capable of performing a measurement of the rotational speed of a rotating element of the wheel support, the sensor having a stop designed to bear against the wheel support when the insert is inserted into the bore so that the measuring end is positioned to allow a measurement of the rotation speed of the element, the sensor comprising clipping means designed to allow the sensor to be fixed in the support, when the stop is resting on the support, by cooperation with complementary clipping means provided on the wheel support.

[0007] The invention also relates to a wheel support having a bore to allow the insertion of the insert of a speed sensor according to the invention, the support comprising complementary clipping means provided on the support to allow fixing of the sensor by clipping with the clipping means of the sensor, when the sensor is inserted in abutment in the bore.

[0008] The invention finally relates to a motor vehicle comprising at least one wheel support according to the invention and a speed sensor according to the invention inserted in abutment in each bore.

[0009] Thus, a speed sensor according to the invention, used in conjunction with a wheel support according to the invention, facilitates assembly and / or replacement operations. It is sufficient to clip the clipping means into the complementary clipping means to correctly fix the sensor according to the invention to the support according to the invention. In particular, during maintenance operations on a vehicle that has already been assembled, it is not necessary to unscrew the fixing screw of the device to be replaced in order to screw it back in once the device has been replaced. The speed sensor according to the invention and the wheel support according to the invention make it possible to dispense with the fixing screws and simplify assembly operations. The clip-on fixing obtained proves to be particularly durable.

[0010] According to one embodiment of the invention, the clipping means protrude from the stop.

[0011] According to one possibility of the speed sensor, the clipping means comprise at least one clipping pin.

[0012] According to one embodiment of the speed sensor, the stop forms a plate extending around the insert.

[0013] According to one possibility, the insert has a shape allowing it to be pivoted when it is inserted into the bore.

[0014] According to one possibility of the wheel support, the complementary clipping means are designed to require rotation of the sensor inserted in abutment in the bore to form the clipping attachment.

[0015] According to one embodiment of the wheel support, the complementary clipping means comprise at least one omega-shaped clip.

[0016] The invention will be better understood on reading the detailed description which follows, given solely by way of non-limiting example and made with reference to the appended drawings in which:

[0017] [Fig.l] [Fig.l] represents a perspective view of a speed sensor according to the invention;

[0018] [Fig.2] [Fig.2] represents a perspective view of a wheel support according to the invention;

[0019] [Fig.3] [Fig.3] represents a perspective view of the speed sensor of [Fig.l] mounted on the wheel support of [Fig.2].

[0020] In these figures, the same references are used to designate the same elements.

[0021] A wheel speed sensor 1 according to the invention, illustrated in [Fig. 1], is designed to be inserted into a bore 2 of a wheel support 3, illustrated in [Fig. 2], to measure the rotational speed of a wheel. For this purpose and as illustrated in [Fig. 2], the bore 2 provides access to a rotating element of the wheel support 3, not illustrated, the rotation measurement of which is representative of the rotational speed of the wheel fixed to the support 3.

[0022] The sensor 1 according to the invention has an insert 4 designed to be inserted and pivoted in the bore 2. The insert 4 extends along a longitudinal axis to a measuring end 5 capable of measuring the rotational speed of the rotating element of the wheel support 3. The end 5 houses for this purpose, for example, a Hall effect cell. The shape of the insert 4 is inscribed in a circular base cylinder whose diameter is less than or equal to that of the bore 2 in order to allow it to rotate freely in the bore 2.

[0023] The sensor 1 also has a stop 6 designed to come into contact with the wheel support 3, when the insert 4 is inserted into the bore 2 so that the measuring end 5 is positioned to allow a measurement of the rotational speed of the rotating element. The stop 6 thus prevents the end 5 from being inserted further into the bore 2. As illustrated in [Fig.l], the stop 6 forms a plate 7 extending around the insert 4. The stop 6 forms a flat surface 7 making it possible to form a plane-on-plane support with a periphery 8 of the bore 2, illustrated in [Fig.2], having a flat surface allowing the rotation of the sensor 1 inserted in the bore 2. For this purpose, the periphery 8 forms a flat surface.

[0024] As illustrated in [Fig.l], the stop 6 forms a separation between the insert 4 and a housing 9 of the sensor 1 housing electronic devices necessary for the operation of the sensor 1 and for the transmission of the information measured at the measuring end 5 to a processing unit, not illustrated, using, for example, a cable 10.

[0025] The speed sensor 1 according to the invention further comprises clipping means 11 designed to allow the sensor 1 to be fixed in the support 3, when the stop 6 is resting on the support 3, by cooperation with complementary means of 12 clips provided on the wheel support 3.

[0026] As illustrated in [Fig.l], the clipping means 11 comprise at least one clipping pin 13 projecting from the stop 6. In the example illustrated in the figures, the pin 13 extends along a plane perpendicular to the longitudinal axis of the insert 4.

[0027] The complementary clipping means 12 of the wheel support 3 make it possible to form a clipping attachment with the pin 13, when the sensor 1 is inserted in abutment in the bore 2. Advantageously, the complementary clipping means 12 are designed to require a rotation of the sensor 1, inserted in abutment in the bore 2, to form the clipping attachment. Thus, for example, the complementary clipping means 12 comprise at least one omega-shaped clip 14 whose dimensions are adapted to those of a clipping pin 13. For this purpose, each clip 14 defines an opening 15 for introducing a pin 13 extending in a plane parallel to the longitudinal axis of the insert 4.

[0028] Thus, on a vehicle according to the invention comprising at least one wheel support 3 according to the invention, each bore 2 is occupied by an insert 4 of a sensor 1 which is fixed by clipping the clipping means 11 with the corresponding complementary clipping means 12. In order to ensure fixing by clipping, the sensor 1, with the stop 6 resting on the periphery 8, is rotated in order to make the pin 13 penetrate into the opening 15 of the clip 14 to bring it into the fixed position, illustrated in [Fig. 3].

[0029] Thus, the speed sensor 1 according to the invention, used in conjunction with the wheel support 3 according to the invention, facilitates the assembly and / or replacement operations. It is sufficient to clip the clipping means 11 into the complementary clipping means 12 to correctly fix the sensor 1 on the support 3, for example by rotating the sensor 1 inserted in the bore 2. In particular, during maintenance operations on a vehicle that has already been assembled, it is not necessary to unscrew the fixing screw to screw it back in once the ABS sensor has been replaced. The speed sensor 1 and the wheel support 3 make it possible to dispense with the fixing screws and simplify the assembly operations. The clip-on fixing obtained proves to be particularly durable.

[0030] The invention is not limited to the embodiments of the speed sensor and / or the wheel support described above, only by way of example, but other embodiments can be designed by those skilled in the art without departing from the scope and scope of the present invention.

Claims

Claims

1. Wheel speed sensor (1) designed to be inserted into a bore (2) of a wheel support (3) for measuring the rotational speed of a wheel, the sensor (1) having an insert (4) designed to be inserted into the bore (2) and extending to a measuring end (5) capable of measuring the rotational speed of a rotating element of the wheel support (3), the sensor (1) having a stop (6) designed to bear against the wheel support (3) when the insert (4) is inserted into the bore (2) so that the measuring end (5) is positioned to allow a measurement of the rotational speed of the element, the sensor (1) comprising clipping means (11) designed to allow the sensor (1) to be fixed in the support (3), when the stop (6) is bearing against the support (3), by cooperation with complementary clipping means (12) provided on the wheel support (3).

2. Speed ​​sensor (1) according to claim 1, characterized in that the clipping means (11) project from the stop (6).

3. Speed ​​sensor (1) according to claim 1 or 2, characterized in that the clipping means (11) comprise at least one clipping pin (13).

4. Speed ​​sensor (1) according to one of claims 1 to 3, characterized in that the stop (6) forms a plate (7) extending around the insert (4).

5. Speed ​​sensor (1) according to one of claims 1 to 4, characterized in that the insert (4) has a shape allowing it to be pivoted when it is inserted into the bore (2).

6. Wheel support (3) having a bore (2) to allow the insertion of the insert (4) of a speed sensor (1) according to one of claims 1 to 5, the support (3) comprising complementary clipping means (12) provided on the support (3) to allow fixing of the sensor (1) by clipping with the clipping means (11) of the sensor (1), when the sensor (1) is inserted in abutment in the bore (2).

7. Wheel support (3) according to claim 6, characterized in that the complementary clipping means (12) are designed to require rotation of the sensor (1) inserted in abutment in the bore (2) to form the clipping attachment.

8. Wheel support (3) according to claim 6 or 7, characterized in that the complementary clipping means (12) comprise at least one

9. omega-shaped clip (14). Motor vehicle comprising at least one wheel support (3) according to one of claims 6 to 8 and a speed sensor (1) according to one of claims 1 to 5 inserted in abutment in each bore (2).

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