ANGULAR AND RADIAL MISREPRESENTATION TRANSMISSION JOINT

Abstract

The invention relates to a transmission joint comprising a first means (110) configured to be fixed to a first axis of rotation (x1), a second means (120) configured to be fixed to a second axis of rotation (x2), and coupling means (130) between said first means and said second means, characterized in that said coupling means comprise: a first sliding pivot joint (PG1), and a second sliding pivot joint (PG2). The invention also relates to a vehicle equipped with such a transmission joint. Figure [1]

Description

Title of the invention: TRANSMISSION JOINT WITH ANGULAR AND RADIAL MISREPRESENTATION CORRECTION technical field

[0001] The present invention relates to a motion transmission joint enabling correction not only of angular misalignment but also of radial misalignment between two rotating shafts.

[0002] The present invention finds its application in particular in transmission devices of vehicles, especially automobiles. State of the art

[0003] Vehicles are usually equipped with universal joints to allow the coupling of two non-coaxial rotating shafts or shafts whose angular position relative to each other may change. These rotating shafts may, for example, be formed by a drive shaft of an internal combustion engine and a wheel shaft.

[0004] A transmission joint, of the cardan joint type, allowing correction of angular misalignment and axial misalignment between two rotating shafts, is known from document FR3128259_A1.

[0005] However, this type of transmission joint does not give complete satisfaction.

[0006] Indeed, this type of transmission joint does not allow for the correction of the radial misalignments.

[0007] The existing solutions for correcting angular and radial misalignments are respectively the Cardan joint and the Oldham joint, which consequently constitute two distinct components, and thus require multiplying the components.

[0008] One object of the present invention is to remedy at least one of the drawbacks of the prior art. Description of the invention

[0009] To this end, the invention relates to a transmission joint comprising a first means configured to be fixed to a first axis of rotation, a second means configured to be fixed to a second axis of rotation, said first axis and said second axis being concurrent, coupling means between said first means and said second means, characterized in that said coupling means comprise: - a first sliding pivot joint allowing the pivoting of said first means around an axis perpendicular to the first axis of rotation as well as the translation of said first means along said axis perpendicular to the first axis of rotation, - a second sliding pivot joint allowing the pivoting of said second means around an axis perpendicular to the second axis of rotation, as well as the translation of said second means along said axis perpendicular to the second axis of rotation, the axis perpendicular to the first axis of rotation and the axis perpendicular to the second axis of rotation, being perpendicular to each other.

[0010] Optional features of the invention, complementary or alternative, are stated below.

[0011] According to a particular embodiment, the first means configured to be fixed to a first axis of rotation, and the second means configured to be fixed to a second axis of rotation, each form a socket having at one of its ends a cylindrical opening configured to accommodate a shaft of rotation.

[0012] According to an improvement relating to this particular embodiment, the inner circumferential surface of the cylindrical opening of the bushings forming respectively the first means and the second means, is provided with grooves configured to cooperate with grooves provided on the shaft of rotation accommodated.

[0013] According to another particular embodiment, the first sliding pivot joint comprises: - a first stud defining the axis perpendicular to the first axis of rotation and designed to pass through the first means, - a first sleeve designed to be mounted freely in translation and rotation around the first stud, said first sleeve being integral with the second sliding pivot joint.

[0014] According to yet another particular embodiment, the second sliding pivot joint comprises: - a second stud defining the axis perpendicular to the second axis of rotation and designed to pass through the second means, - a second sleeve designed to be mounted freely in translation and rotation around the second stud, said second sleeve being integral with the first sliding pivot joint.

[0015] According to an advantageous aspect of the invention, mounting the first sleeve on the first stud and mounting the second sleeve on the second stud can allow a translational stroke of 20 mm.

[0016] The invention also relates to a motor vehicle comprising a transmission joint according to an embodiment of the invention.

[0017] According to an advantageous aspect of the invention, the motor vehicle comprises: - a rotating shaft attached to the first means of said transmission joint, said rotating shaft forming the first axis of rotation, - a driven rotation shaft secured to the second means of said transmission joint, said driven rotation shaft forming the second axis of rotation. Brief description of the FIGURES

[0018] The invention will be better understood upon reading the following description, given solely by way of non-limiting example and made with reference to the accompanying drawings in which: - Fig. 1 is a schematic representation of the kinematics of the transmission joint according to the invention. - [Fig.2] is a schematic representation of a non-limiting example embodiment of a transmission joint according to the invention, in the assembled state. - [Fig.3] is a schematic representation of a non-limiting example of an embodiment of a transmission joint according to the invention, in the disassembled state.

[0019] It is understood that the embodiments described below are in no way limiting. In particular, variants of the invention may be conceived comprising only a selection of the features described below, isolated from the other features described, if this selection of features is sufficient to confer a technical advantage or to differentiate the invention from the prior art. This selection includes at least one preferably functional feature without structural details, or with only a portion of the structural details if this portion alone is sufficient to confer a technical advantage or to differentiate the invention from the prior art.

[0020] In particular, all the variants and all the embodiments described are combinable with each other if nothing prevents this combination from a technical point of view.

[0021] In the figures and in the rest of the description, elements common to several figures retain the same reference. Detailed description of the FIGURES

[0022] Fig. 1 is a schematic representation of the kinematics of the transmission joint according to the invention.

[0023] The transmission joint according to the invention includes similarities with Cardan joints in that it allows the transmission of angular rotation between two shafts whose geometric axes xl and x2 are concurrent, thus achieving a ball joint to finger connection.

[0024] However, the coupling means 130 of the transmission joint according to the invention include: - a first sliding pivot joint PG1 allowing the pivoting of the coupling means 130 around an axis zl perpendicular to the first axis of rotation xl as well as the translation of the coupling means 130 along said axis zl perpendicular to the first axis of rotation xl, - a second sliding pivot joint PG2 allowing the pivoting of the coupling means 130 around an axis y2 perpendicular to the second axis of rotation x2 as well as the translation of the coupling means 130 along said axis y2 perpendicular to the second axis of rotation x2.

[0025] The axis zl perpendicular to the first axis of rotation xl and the axis y2 perpendicular to the second axis of rotation x2, are perpendicular to each other.

[0026] Thus, with a single coupling, it is possible to correct both angular misalignments and radial misalignments, which is a considerable gain, thus merging into one a Cardan type joint and an Oldham type joint.

[0027] FIGURES 2 and 3 are schematic representations of a non-limiting example embodiment of a transmission joint according to the invention, in the assembled state for [Fig.2] and in the disassembled state for [Fig.3].

[0028] The transmission joint includes a first means 110 configured to be fixed to a first axis of rotation xl, a second means 120 configured to be fixed to a second axis of rotation x2, as well as coupling means 130 between said first means and said second means.

[0029] The coupling means 130 include a first sliding pivot joint PG1 allowing the pivoting of said first means 110 around an axis zl perpendicular to the first axis of rotation xl as well as the translation of said first means 110 along said axis zl perpendicular to the first axis of rotation xl.

[0030] The coupling means 130 also include a second sliding pivot joint PG2 allowing the pivoting of said second means 120 around an axis y2 perpendicular to the second axis of rotation x2 as well as the translation of said second means 120 along said axis y2 perpendicular to the second axis of rotation x2.

[0031] The axis zl perpendicular to the first axis of rotation xl and the axis y2 perpendicular to the second axis of rotation x2, are perpendicular to each other.

[0032] According to the embodiment shown in FIGURES 2 and 3, the first means 110 configured to be fixed to a first axis of rotation xl and the second means 120 configured to be fixed to a second axis of rotation x2, each form a socket having at one of its ends a cylindrical opening configured to accommodate a shaft of rotation.

[0033] These bushings are hollow and substantially cylindrical metal pieces, and are intended to receive a rotating shaft.

[0034] Advantageously, the inner circumferential surface of the cylindrical opening of the bushings is provided with grooves configured to cooperate with grooves formed on the shaft of rotation it houses. In this way, the bushing and the shaft it houses are meshed for rotation, one thus driving the other in rotation.

[0035] As shown in FIGURES 2 and 3, the first sliding pivot joint PG1 includes a first stud 131 defining the axis zl perpendicular to the first axis of rotation xl. The first stud 131 passes through the sleeve forming the first means 110 and is anchored in the circumferential surface of said sleeve.

[0036] The first sliding pivot joint PG1 also includes a first sleeve 133 intended to be mounted freely in translation and rotation around the first stud 131.

[0037] The first sleeve 133 is further attached to the second sliding pivot joint PG2.

[0038] Similarly and as shown in FIGURES 2 and 3, the second sliding pivot joint PG2 has a second stud 132 defining the y2 axis perpendicular to the second axis of rotation x2.

[0039] The second stud 132 passes through the sleeve forming the second means 120 and is anchored in the circumferential surface of said sleeve.

[0040] The second sliding pivot joint PG2 also includes a second sleeve 134 intended to be mounted freely in translation and rotation around the second stud 132.

[0041] The second sleeve 134 is further attached to the first sliding pivot joint PG1.

[0042] In this case, the first sleeve 133 and the second sleeve 134 are fixed to each other without any degree of freedom.

[0043] Advantageously, mounting the first sleeve 133 on the first stud 131 and mounting the second sleeve 134 on the second stud 132 each allow a translational stroke of up to 20 mm. This value is sufficient to compensate for radial misalignments of the axes xl and x2, in the case of a driving rotation shaft fixed to the first means 110, said driving rotation shaft forming the first axis of rotation xl, and a driven rotation shaft fixed to the second means 120, said driven rotation shaft forming the second axis of rotation x2.

[0044] The transmission joint according to the invention finds particular application in motor vehicles when it is necessary to couple two rotating shafts non-aligned, or whose angular positions relative to each other can vary, such as the steering wheel axis, the steering box, the transmissions.

[0045] In particular, the transmission joint according to the invention finds application in longitudinal transmissions, in the case of a forward-engine vehicle with a rigid rear axle, for example, that is to say in the case where the wheels move vertically.

[0046] The longitudinal transmission must indeed correct angular misalignments and radial misalignments.

[0047] Of course, the invention is not limited to the examples just described.

Claims

Demands

1. Transmission joint comprising a first means (110) configured to be fixed to a first axis of rotation (xl), a second means (120) configured to be fixed to a second axis of rotation (x2), said first axis and said second axis being concurrent, coupling means (130) between said first means and said second means, characterized in that said coupling means comprise: - a first sliding pivot joint (PG1) allowing the pivoting of said first means (110) around an axis (zl) perpendicular to the first axis of rotation (xl) as well as the translation of said first means (110) along said axis (zl) perpendicular to the first axis of rotation (xl),- a second sliding pivot joint (PG2) allowing the pivoting of said second means (120) around an axis (y2) perpendicular to the second axis of rotation (x2) as well as the translation of said second means (120) along said axis (y2) perpendicular to the second axis of rotation (x2), the axis (zl) perpendicular to the first axis of rotation (xl) as well as the axis (y2) perpendicular to the second axis of rotation (x2), being perpendicular to each other.

2. Transmission joint according to claim 1 or 2, characterized in that the first means (110) configured to be fixed to a first axis of rotation (xl), and the second means (120) configured to be fixed to a second axis of rotation (x2), each form a sleeve having at one of its ends a cylindrical opening configured to accommodate a shaft of rotation.

3. Transmission joint according to the preceding claim, characterized in that the inner circumferential surface of the cylindrical opening of the bushings forming respectively the first means (110) and the second means (120), is provided with grooves configured to cooperate with grooves provided on the shaft of rotation accommodated.

4. Transmission joint according to any one of the preceding claims, characterized in that the first sliding pivot joint (PG1) comprises: - a first stud (131) defining the axis (zl) perpendicular to the first axis of rotation (xl) and intended to pass through the first means (110), - a first sleeve (133) intended to be mounted freely in translation and rotation around the first stud (131), said first sleeve (133) being integral with the second sliding pivot joint (PG2).

5. Transmission joint according to any one of the preceding claims, characterized in that the second sliding pivot joint (PG2) comprises: - a second stud (132) defining the axis (y2) perpendicular to the second axis of rotation (x2) and intended to pass through the second means (120), - a second sleeve (134) intended to be mounted freely in translation and rotation around the second stud (132), said second sleeve (134) being integral with the first sliding pivot joint (PG1).

6. Transmission joint according to claims 4 and 5, characterized in that the mounting of the first sleeve (133) on the first stud (131) and the mounting of the second sleeve (134) on the second stud (132) allow a translational stroke of 20 mm.

7. Motor vehicle comprising a transmission joint according to any one of the preceding claims.

8. Motor vehicle according to the preceding claim, characterized in that it comprises: - a driving rotation shaft attached to the first means (110) of said transmission joint, said driving rotation shaft forming the first axis of rotation (xl), - a driven rotation shaft attached to the second means (120) of said transmission joint, said driven rotation shaft forming the second axis of rotation (x2).

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