Wheel bearing device connected to a wheel speed detection device

Abstract

Wheel bearing device connected to a wheel speed detection device, comprising: - an outer element (5, 50) which is provided on an outer circumference with a mounting flange (5b) for attachment to a suspension device of a vehicle and is also provided on its inner circumference with two rows of outer running ring surfaces (5a); - an inner element (3, 49) comprising a wheel hub (1, 48) and at least one inner ring (2), wherein the wheel hub (1, 48) is integrally formed at one end with a wheel mounting flange (6) and has a cylindrical section (1b) extending axially from the wheel mounting flange (6), wherein the inner ring (2) is press-fitted onto the cylindrical section (1b) of the wheel hub (1, 48) and the wheel hub (1, 48) and the inner ring (2) are provided on their outer circumference with two rows of inner raceway surfaces (1a, 2a) opposite the two rows of outer raceway surfaces (5a); - two rows of rolling elements (4) which are mounted in a rolling manner between the inner (1a, 2a) and the outer raceway surfaces (5a); - Seals (8, 9, 51) which are fitted in annular openings formed between the outer element (5, 50) and the inner element (3, 49); - a sensor holder (10, 27, 37, 40, 43, 56, 69) comprising an annular cover (11, 28, 38, 41, 44) that is press-fitted onto the outer circumference of an inner end section of the outer element (5, 50), and a resin-based retaining section (12, 29, 39, 42, 45) connected to the cover (11, 28, 38, 41, 44) and containing a wheel speed sensor (14, 36, 64); and - a pulse ring (61) arranged on the outer circumference of the inner ring (2) and having circumferential features that change alternately and at equal intervals, wherein the pulse ring (61) is arranged such that it faces the wheel speed sensor (14, 36, 64) across a predetermined axial gap, - wherein the cover (11, 28, 38, 41, 44) comprises a cylindrical fitting section (11a, 28a, 44a) suitable for press-fitting onto the inner end section of the outer element (5, 50), a flange section (11b, 28b, 44b) extending radially inwards from the fitting section (11a, 28a, 44a) and suitable for being brought into close contact with the end face of the outer element (5, 50), and a bottom section (11c, 28c, 38c, 44c) extending further radially inwards from the flange section (11b, 28b, 44b) towards the inner ring (2) and on the inner side of the inner ring (2), wherein a fastening section (20, 30, 41a) is attached to the bottom section (11c, 28c, 38c, 44c) of the cover (11, 28, 38, 41, 44) is formed such that it projects from the bottom section (11c, 28c, 38c, 44c) to the inside on a radially outer section of the bottom section (11c, 28c, 38c, 44c); - wherein the retaining section (12, 29, 39, 42, 45) is integrally connected to the fastening section (20, 30, 41a) of the bottom section (11c, 28c, 38c, 44c), wherein the retaining section (12, 29, 39, 42, 45) is arranged over a region extending beyond the outer circumference of the fastening section (20, 30, 41a) to the fitting section (11a, 28a, 44a); and - wherein the flange section (11b, 28b, 44b) is shaped such that it has a flat surface such that it forms a bearing width greater than 5 mm or more on the end face of the outer element (5, 50) or greater than 50% or more in relation to the flat width of the end face of the outer element (5, 50).

Description

AREA OF INVENTION

[0001] The present invention relates to a wheel bearing device connected with a wheel speed detection device for rotatably holding a wheel of a motor vehicle, etc. DESCRIPTION OF THE STATE OF THE ART

[0002] A wheel bearing device connected with a wheel speed detection device, capable of holding a wheel relative to a suspension device and of detecting wheel speed for controlling the anti-lock braking system (ABS), is generally known. Such a bearing device generally comprises a wheel speed detection device, which includes: a magnetic encoder having magnetic poles arranged alternately along its circumference, and which is received in a sealing device arranged between an inner and an outer element to accommodate rolling elements between them, and a wheel speed detection sensor to detect the change in the magnetic poles of the magnetic encoder according to the rotation of the wheel.

[0003] The wheel speed sensor is usually mounted on a steering knuckle after the wheel bearing assembly has been attached to the knuckle, which forms a suspension assembly. Recently, a wheel bearing assembly combined with a wheel speed detection device has been proposed, in which a wheel speed detection sensor is incorporated into the wheel bearing to reduce the size of the wheel bearing assembly and also to eliminate the difficulty of adjusting the air gap between the wheel speed sensor and the magnetic encoder.

[0004] A in Fig. An example of a wheel bearing device connected to a wheel speed detection device, shown in Figure 28, is known. This wheel bearing device connected to a wheel speed detection device comprises an outer element 101, which is attached to a suspension device (not shown) of a vehicle and forms a fixed element, and an inner element 102, which is inserted into the outer element 101 via several balls 103, 103. The outer element is integrally formed on its outer circumference with a mounting flange 101b and on its inner circumference with two rows of outer raceways 101a, 101a.

[0005] The inner element 102, in turn, comprises a wheel hub 105 and an inner ring 106 and is provided with two rows of inner raceways 105a, 106a, which correspond opposite the two rows of outer raceways 101a, 101a of the outer element. One inner raceway 105a is formed on the outer circumference of the wheel hub 105, and the other inner raceway 106a is formed on the outer circumference of the inner ring. The inner ring 106 is press-fitted onto a cylindrical section 105b, which extends axially from the inner raceway 105a of the wheel hub 105. Two rows of balls 103, 103 are accommodated between these two rows of outer and inner raceways and are rotatably held therein by cages 107, 107.

[0006] The wheel hub 105 is integrally formed with a wheel mounting flange 104 for attaching a wheel (not shown), and hub bolts 104a are fastened to this flange at positions spaced equally around its circumference. The wheel hub 105 is further provided on its inner circumference with a toothed section 105c into which a shaft section 111 of an outer joint element 110, forming a constant velocity joint, is inserted. Seals 108, 109 are fitted at both ends of the outer element 101 to prevent the escape of lubricating grease contained in the bearing and the ingress of rainwater or dust from outside the bearing.

[0007] As in Fig. As shown in Figure 29, the inner seal 109 comprises a first sealing plate 112, which has an L-shaped cross-section and is suitable for fitting into the inner circumference of the outer element 101, and a second sealing plate 113, which has an L-shaped cross-section and is suitable for being arranged opposite the first sealing plate 112. The second sealing plate 113 comprises a cylindrical section 113a, which is suitable for fitting onto the inner ring 106, and a raised section 113b, which extends radially outward from the cylindrical section 113a. A magnetic encoder 114 is bonded to the inner surface of the raised section 113b by means of a vulcanized adhesive. The magnetic encoder 114 is formed from a rubber magnet mixed with a magnetic powder and is configured with magnetic north and south poles arranged alternately along its circumference.

[0008] The first sealing plate 112 in turn comprises a core metal 115 with an L-shaped cross-section and a sealing element 116, which is bonded to the core metal 115 via a vulcanized adhesive and includes a side lip 116a, which is in sliding contact with the outer surface of the raised section 113b of the second sealing plate 113, and a pair of radial lips 116b, 116c, which are in sliding contact with the cylindrical section 113a of the second sealing plate 113.

[0009] At the end of the outer element 101, an annular sensor holder 119 is attached, comprising a fitting cylinder 117 and a retaining section 118 connected to the fitting cylinder 117. The fitting cylinder 117 comprises a cylindrical fitting section 117a and a flanged section 117b, which extends radially inward from the fitting section 117a and has a completely annular design with an L-shaped cross-section.

[0010] The retaining section 118 is formed in one piece, and a wheel speed sensor 120 is embedded therein such that it faces the encoder 114 across a predetermined air gap. The wheel speed sensor 120 comprises a magnetic locking element, such as a Hall-effect sensor, a magnetic resistance element (MR element), etc., which changes its properties according to the direction of the magnetic flux, and an integrated circuit connected to a waveform circuit that rectifies the output waveform of the magnetic locking element.

[0011] A labyrinth seal is formed by a small gap 121 between the end face of the inner ring 106 and the flange section 117b. This labyrinth seal prevents foreign substances, such as magnetic powder, from entering the space between the magnetic encoder 114 and the wheel speed sensor 120 before the shaft section 111 of the outer joint element 110 is inserted into the wheel hub 105. This also includes the transport of the bearing assembly to a motor vehicle manufacturer's production line. This improves the reliability of the wheel speed measurement.

[0012] Reference patent document 1: Japanese patent disclosure JP 2003-254985A

[0013] Another wheel bearing device with a rotational speed detection device is known from JP 2007 010 480 A. A rolling bearing unit with a plurality of rolling elements between a stationary raceway and a rotating raceway and a rotational speed sensor is also known from US 5 852 361 A. DISCLOSURE OF THE INVENTION: Problems that the invention is intended to solve

[0014] However, in the prior art wheel bearing device connected to a wheel speed detection device, the fact that the sensor holder 119 is arranged between a steering knuckle (not shown) and the outer joint element 110 creates a risk that foreign substances such as mud, etc., may penetrate the bearing device through an annular opening between the outer joint element 110 and the steering knuckle, thereby impairing the accuracy of the wheel speed detection. Additionally, there is a risk that foreign substances that have penetrated and solidified on the rotating parts of the wheel bearing may be blown off by centrifugal force and damage the surfaces of the magnetic encoder 114 and the retaining section 118. Consequently, it is difficult to maintain the reliability of the wheel speed detection over a long period.

[0015] Additionally, there is also the risk that, due to the formation of a gap between the flange section and the end surface of the outer element 101, a suitable air gap (labyrinth) will not be formed if the fitting section 117a of the fitting cylinder 117 is press-fitted onto the outer element 101 at an angle or incorrectly.

[0016] There is also a risk that the length of the cable bundle will be 122 ( Fig. 30) after assembly of the bearing device, it is insufficient and damaged, or that due to incorrect positioning of a drain opening 123 of the guide cylinder 117, if the guide cylinder 117 is incorrectly press-fitted onto the outer element 101 in the circumferential direction and the retaining section 118 connected to the guide cylinder 117 is also incorrectly positioned with respect to the outer element 101, a foreign substance that has entered the bearing device cannot be reliably expelled and therefore remains in the bearing device and solidifies there. As a result, foreign substances that have entered and solidified on rotating parts of the wheel bearing are blown off by centrifugal force and damage the surfaces of the magnetic encoder 114 and the retaining section 118. Consequently, it is difficult to maintain the reliability of the wheel speed determination for a long time.

[0017] Furthermore, because the retaining section 118 of the sensor holder 119 is not strictly limited with regard to the extent of its projection from the end face of the outer element 101 and its radial thickness, there is a risk that the retaining section 118 and the outer joint element 110 may interfere with each other. Additionally, there is a risk that the retaining section 118 will be damaged if the cable harness 122 leading from the retaining section becomes caught during transport of the storage device. Particularly in cold environments, the retaining section 118 is prone to damage from excessive load exerted on the cable harness 122 attachment point during wheel steering, as the cable harness 122 is in a frozen state.

[0018] It is therefore an object of the present invention to provide a wheel bearing device connected with a wheel speed detection device that can prevent the ingress of foreign substances into the detection section and can improve the machinability and accuracy in the assembly of the sensor holder and therefore the accuracy of the wheel speed detection.

[0019] It is another task to provide a wheel bearing device associated with a wheel speed detection device, which can improve the strength and rigidity of the sensor holder by optimizing its size and can also prevent disruptive interference of the sensor holder with surrounding parts of a vehicle. Means to solve the problems

[0020] To solve the aforementioned problems, according to the present invention of claim 1, a wheel bearing device connected with a wheel speed detection device is provided, comprising an outer element having a mounting flange on its outer circumference for attachment to a suspension device of a vehicle and also having two rows of outer raceways on its inner circumference; an inner element comprising a wheel hub and at least one inner ring, wherein the wheel hub is integrally formed at one end with a wheel mounting flange and has a cylindrical section extending axially from the wheel mounting flange, wherein the inner ring is press-fitted onto the cylindrical section of the wheel hub and the wheel hub and the inner ring have two rows of inner raceways on their outer circumference, opposite the two rows of outer raceways;two rows of rolling elements that are mounted in a rolling manner between the inner and outer raceway surfaces; seals that are fitted in annular openings formed between the outer element and the inner element; a sensor holder comprising an annular cover that is press-fitted onto the outer circumference of an inner end section of the outer element, and a resin-based retaining section connected to the cover that contains a wheel speed sensor;a pulse ring arranged on the outer circumference of the inner ring and having alternating and equally spaced changing circumferential features, wherein the pulse ring is arranged such that it faces the wheel speed sensor across a predetermined axial gap, wherein the cover comprises a cylindrical fitting section suitable for press-fitting onto the inner end section of the outer element, a flange section extending radially inward from the fitting section and suitable for being brought into close contact with the end face of the outer element, and a bottom section extending further radially inward from the flange section toward the inner ring and on the inner side of the inner ring, wherein a fastening section is formed on the bottom section of the cover such that it projects from the bottom section to the inner side at a radially outer section of the bottom section;wherein the retaining section is integrally connected to the fastening section of the base section, wherein the retaining section is arranged to the fitting section over a region extending beyond the outer circumference of the fastening section; and wherein the flange section is shaped to have such a flat surface that it forms a bearing width greater than 5 mm or more at the end face of the outer element or greater than 50% or more with respect to the flat width of the end face of the outer element.

[0021] According to the wheel bearing device of claim 1, which is connected with a wheel speed detection device, it is due to the fact that it comprises a sensor holder comprising an annular cover that is press-fitted onto the outer circumference of an inner end section of the outer element, and a holding section made of synthetic resin and connected to the cover, in which a wheel speed sensor is contained, and the cover comprising a cylindrical fitting section suitable for being press-fitted onto the inner end section of the outer element, and a flange section extending radially inward from the fitting section and suitable for being brought into close contact with the end face of the outer element, and a bottom section extending further inward from the flange section toward the inner ring and on the inside of the inner ring,wherein a fastening section is formed on the bottom section of the cover such that it projects from the bottom section to the inside on a radially outer section of the bottom section; wherein the retaining section is integrally connected to the fastening section of the bottom section, the retaining section being arranged to the fitting section over a region extending beyond the outer circumference of the fastening section; and wherein the flange section is shaped to have such a flat surface as to form a bearing width greater than 5 mm or more at the end face of the outer element or greater than 50% or more with respect to the flat width of the end face of the outer element, making it possible to provide a wheel bearing device connected with a wheel speed detection device which can improve the positioning accuracy of the cover by achieving close contact between the cover and the outer element.to prevent the cover from being pressed onto the outer element at an angle or incorrectly, and thereby improve the assembly accuracy of the sensor holder as well as the locking accuracy.

[0022] As defined in claim 2, it is preferred that an inner seal of the seals comprises an annular sealing plate comprising a core metal, which is press-formed from a steel plate to have a substantially L-shaped cross-section and is suitable for fitting into the inner end of the outer element, and a sealing element integrally connected with the core metal, and a centrifugal ring, which is press-formed from a steel plate to have a substantially L-shaped cross-section and is suitable for fitting onto the outer circumference of the inner ring; and that a magnetic encoder is integrally connected with the inner surface of the centrifugal ring, the magnetic encoder consisting of an elastomer mixed with a magnetic powder and being magnetized by north and south poles arranged alternately in a circumferential direction.

[0023] According to the invention, a fastening section is formed on the bottom section of the cover such that it projects from the bottom section towards the inside on a radially outer section of the bottom section; and the retaining section is arranged relative to the fitting section over an area extending beyond the outer circumference of the fastening section. This makes it possible to ensure space for the retaining section and to increase the flat surface area of ​​the flange section by further radially inward extension of the flange section.

[0024] As defined in claim 3, it is also preferred that a cable harness extends tangentially to the cover from the retaining section. This makes it possible to easily route the cable harness radially out of a steering knuckle, thereby improving machinability during assembly of the bearing device.

[0025] It is preferred that the retaining section be arranged within a range of 30 to 90° from a perpendicular direction to the ground. This makes it possible to prevent internal wiring within the retaining section from being subjected to adverse effects caused by excessive bending of the cable bundle relative to the retaining section, and to prevent impairment of workability due to an unnecessary increase in the length of the cable bundle.

[0026] It is preferred that a drainage opening be formed in the bottom section of the cover at a position closest to the ground. This allows foreign matter such as muddy water or debris to be easily expelled from the bottom section of the cover should it have entered. Accordingly, it is possible to prevent parts of the storage device from being adversely affected by these foreign materials.

[0027] As defined in claim 4, it is preferred that the cover is formed from a non-magnetic austenitic stainless steel sheet. This makes it possible to ensure the exact locking accuracy without having any adverse effect on the sensitivity of the wheel speed sensor.

[0028] As defined in claim 5, it is preferred that the centrifugal ring is formed from a ferromagnetic steel plate. This makes it possible to increase the output signal of the magnetic encoder and thereby ensure stable locking accuracy.

[0029] As defined in claim 6, it is preferred that the retaining section is formed from a non-magnetic resin. This makes it possible to maintain the corrosion resistance, strength, and durability of the bearing device for a long time without having any adverse effect on the sensitivity of the wheel speed sensor.

[0030] As defined in claim 7, it is preferred that the retaining section is formed from polyphenylene sulfide. This also makes it possible to maintain the corrosion resistance, strength, and durability of the bearing device for a long time without having any adverse effect on the sensitivity of the wheel speed sensor.

[0031] As defined in claim 8, it is also preferred that the holding section contains 10 to 45 wt.% of a fiber reinforcement material comprising glass fibers. This makes it possible to use a semi-crystalline material at a temperature exceeding its glass transition temperature, thereby improving heat resistance, rigidity, and dimensional stability due to an increase in the modulus of elasticity.

[0032] As defined in claim 9, it is also preferred that a marking is formed at a predetermined position of the inner end of the outer element and another marking is formed at a predetermined position of the sensor holder, and that the sensor holder is attached to the outer element such that the markings are aligned with each other. This makes it possible to attach the sensor holder precisely to the outer element while observing each marking, improves machinability during assembly of the bearing device, and thereby provides a wheel bearing device connected with a wheel speed detection device that exhibits improved reliability.

[0033] As defined in claim 10, it is preferred that the marking of the outer element is formed by laser marking or painting.

[0034] As defined in claim 11, it is also preferred that the marking of the sensor holder is formed by painting or incising.

[0035] As defined in claim 12, it is also preferred that a cable harness connected to the wheel speed sensor for transmitting an output from the wheel speed sensor to a controller is routed out of the retaining section of the sensor holder, and that the radial dimension of the retaining section is limited to a range of 8.5 to 15.0 mm, and that the extent of the axial projection of the retaining section from the end face of the outer element is limited to a range of 8.5 to 20.0 mm. This makes it possible to provide a wheel bearing device connected to a wheel speed locking device that can ensure such strength and rigidity as to prevent breakage of the retaining section even when the cable harness is pulled, and can improve reliability by preventing disruptive interference with surrounding parts of the bearing device and the suspension.

[0036] As defined in claim 13, it is preferred that the wheel speed sensor comprises a magnetic locking element which changes its properties according to the direction of the magnetic flux, and an integrated circuit connected to a waveform circuit for rectifying the output waveform of the magnetic locking element. This makes it possible to reduce the size of the bearing device and to achieve wheel speed detection with high reliability at low cost.

[0037] As defined in claim 14, it is also preferred that the centrifugal ring is positioned and secured such that the inner surface of the encoder is in the same plane as the end surface of the inner ring or in a position slightly recessed from it towards the inside of the bearing device, and that the outer surface of the retaining section is arranged such that it does not project from the inner surface of the bottom section of the cover. This makes it possible to prevent damage to surfaces of the magnetic encoder or the retaining section by foreign matter such as muddy water or debris blown off by centrifugal force. This makes it possible to maintain a stable and accurate gap between the magnetic encoder and the locking section of the wheel speed sensor for a long period of time. Effects of the invention

[0038] According to the wheel bearing device of the present invention, which is connected with a wheel speed detection device, it is due to the fact that it comprises an outer element which is provided on an outer circumference with a mounting flange for attachment to a suspension device of a vehicle and is also provided on its inner circumference with two rows of outer raceways; an inner element which includes a wheel hub and at least one inner ring, wherein the wheel hub is integrally formed at one end with a wheel mounting flange and has a cylindrical section which extends axially from the wheel mounting flange, wherein the inner ring is press-fitted onto the cylindrical section of the wheel hub and the wheel hub and the inner ring are provided on their outer circumference with two rows of inner raceways which are opposite the two rows of outer raceways;two rows of rolling elements that are mounted in a rolling manner between the inner and outer raceway surfaces; seals that are fitted in annular openings formed between the outer element and the inner element; a sensor holder comprising an annular cover that is press-fitted onto the outer circumference of an inner end section of the outer element, and a resin-based retaining section connected to the cover that contains a wheel speed sensor;and an impulse ring arranged on the outer circumference of the inner ring and having circumferential features that change alternately and at equal intervals, wherein the impulse ring is arranged such that it faces the wheel speed sensor across a predetermined axial gap, and is characterized in that the cover comprises a cylindrical fitting section suitable for press-fitting onto the inner end section of the outer element, a flange section extending radially inward from the fitting section and suitable for being brought into close contact with the end face of the outer element, and a bottom section extending further inward from the flange section; that the retaining section is integrally connected with the bottom section;and that the flange section is shaped to have such a flat surface that it forms a bearing width greater than 5 mm or more at the end face of the outer element or greater than 50% or more in relation to the flat width of the end face of the outer element, making it possible to provide a wheel bearing device connected with a wheel speed detection device, which can improve the positioning accuracy of the cover by achieving close contact between the cover and the outer element to prevent the cover from being press-fitted onto the outer element at an angle or incorrectly, and can thereby improve the assembly accuracy of the sensor holder as well as the locking accuracy. The best way to implement the invention

[0039] The best way to implement the invention is a wheel bearing device connected with a wheel speed detection device, comprising: an outer element having on its outer circumference a mounting flange for attachment to a suspension device of a vehicle and also having on its inner circumference two rows of outer raceways; an inner element comprising a wheel hub and at least one inner ring, wherein the wheel hub is integrally formed at one end with a wheel mounting flange and has a cylindrical section extending axially from the wheel mounting flange, wherein the inner ring is press-fitted onto the cylindrical section of the wheel hub and the wheel hub and the inner ring have on their outer circumference two rows of inner raceways opposite the two rows of outer raceways;two rows of rolling elements that are mounted in a rolling manner between the inner and outer raceway surfaces; seals that are fitted in annular openings formed between the outer element and the inner element; a sensor holder comprising an annular cover that is press-fitted onto the outer circumference of an inner end section of the outer element, and a resin-based retaining section connected to the cover that contains a wheel speed sensor;wherein an inner seal of the seals comprises an annular sealing plate comprising a core metal, which is press-formed from a steel plate to have a substantially L-shaped cross-section and is suitable for fitting into the inner end of the outer element, and a sealing element integrally connected with the core metal, and a centrifugal ring, which is press-formed from a steel plate to have a substantially L-shaped cross-section and is suitable for fitting onto the outer circumference of the inner ring; and wherein a magnetic encoder is connected to the inner surface of the centrifugal ring, wherein the circumferential features of the magnetic encoder change alternately and at equal intervals and are arranged opposite the wheel speed sensor across a predetermined axial gap;and characterized in that the cover comprises a cylindrical fitting section suitable for press-fitting onto the inner end section of the outer element, a flange section extending radially inwards from the fitting section and suitable for being brought into close contact with the end face of the outer element, and a bottom section extending further inwards from the flange section; that a fastening section is formed on the bottom section of the cover such that it projects from the bottom section to the inside at a radially outer section of the bottom section; that the retaining section is arranged towards the fitting section over an area extending beyond the outer circumference of the fastening section;and that the flange section is shaped such that it has a flat surface such that it forms a bearing width greater than 5 mm or more at the end face of the outer element or greater than 50% or more in relation to the flat width of the end face of the outer element. First embodiment

[0040] With reference to the drawings, a first embodiment of the present invention will be described.

[0041] Fig. Figure 1 is a longitudinal section view of a first embodiment of a wheel bearing device of the present invention connected with a wheel speed detection device, Fig. 2 is a partially enlarged view of Fig. 1, which shows the locking section, Fig. 3 is a partially enlarged view of Fig. 2, and Fig. Figure 4 is a side elevation view of Fig. 1. In the following description, an outer side of a bearing device, when attached to a vehicle, is referred to as the "outer side" (the left side in a drawing), and an inner side of a bearing device, when attached to a vehicle, is referred to as the "inner side" (the right side in a drawing).

[0042] The wheel bearing device of the present invention, which is connected to a wheel speed detection device, has a structure of a so-called "third generation" and comprises an inner element 3, which includes a wheel hub 1 and an inner ring 2, and an outer element 5, which is fitted onto the inner element 3 via two rows of rolling elements (balls) 4, 4 and is connected to a constant velocity joint 13.

[0043] The wheel hub 1 is integrally formed on its outer surface with a wheel mounting flange 6 for attaching a wheel (not shown), and hub bolts 6a are fastened to this flange at equally spaced positions around its circumference. The outer circumferential surface of the wheel hub 1 is provided with an (outer) inner raceway 1a, and a cylindrical section 1b extends axially from the inner raceway 1a, and the inner circumference of the wheel hub 1 is provided with a toothed (or splined) section 1c for torque transmission. The inner ring 2 is press-fitted onto the cylindrical section 1b via a predetermined engagement and is provided on its outer circumference with an inner (other) raceway 2a.

[0044] The wheel hub 1 is made of medium / high carbon steel, such as S53C, which contains 0.40 to 0.80 wt.% carbon, and is finished with a hardened layer with a surface hardness of 58 to 64 HRC by high-frequency induction hardening in an area extending from an inner base 6b of the wheel mounting flange 6, which forms a sealing web section of a seal 8, across the inner raceway surface 1a to the cylindrical section 1b. This makes it possible not only to improve the wear resistance of the base section 6b, but also to suppress the frictional wear of the cylindrical section 1b, which forms a mating surface with the inner ring 2, thereby providing sufficient mechanical strength to withstand the torsional bending load exerted on the wheel mounting flange 6 and thus ensuring the durability of the wheel hub 1.The inner ring 2 and the rolling elements 4 are made of chromium steel with a high carbon content such as SUJ2 and are hardened towards their core by immersion quenching so that they have a surface hardness of 58 to 64 HRC.

[0045] The outer element 5 is made of medium / high carbon steel, such as S53C, containing 0.40 to 0.80 wt.% carbon, and is provided on its outer circumference with a mounting flange 5b for attachment to a steering knuckle KN and on its inner circumference with two rows of outer raceways 5a, 5a, corresponding to the two rows of inner raceways 1a, 2a of the inner element 3. The two rows of outer raceways 5a, 5a are hardened by high-frequency induction quenching to a surface hardness of 58 to 64 HRC. The two rows of rolling elements 4, 4 are located between the outer raceways 5a, 5a of the outer element 5 and the opposing inner raceways 1a, 2a, and are held in rolling motion by cages 7, 7.Seals 8, 9 are arranged in annular spaces formed between the outer element 5 and the inner element 3 to prevent the escape of lubricating grease contained in the bearing, as well as the ingress of rainwater or dust into the bearing.

[0046] The constant velocity joint 13 comprises an outer joint element 22, an inner joint ring, a cage, and torque-transmitting balls (not shown). The outer joint element 22 has a one-piece formed shaft section 24 that extends axially from the shoulder 23. The shaft section 24 is provided on its outer circumference with a toothed (or splined) section 24a that engages with the toothed section 1c of the wheel hub 1, and at the end of the toothed section 24a with an external (bolt) thread 24b. The outer joint element 22 is inserted into the wheel hub 1 via the toothed sections 1c and 24a until the end face of the inner ring 2 abuts the shoulder 23 of the outer joint element 22. Accordingly, the wheel hub 1 and the outer joint element 22 can be joined in a torque-transmitting and separable manner by means of a fastening nut 25 which is attached to the external thread 24b.

[0047] In this embodiment, a sensor holder 10 is attached to the inner end of the outer element 5. This sensor holder 10 comprises a cup-shaped cover 11 and a retaining section 12 connected to the cover 11. As shown in the enlarged view of Fig. As shown in Figure 2, the cover 11 is formed in such a way that it has a generally annular shape and comprises a cylindrical fitting section 11a which is press-fitted onto the outer circumference of the inner end of the outer element 5, a flange section 11b which extends radially inwards from the fitting section 11a and is suitable for being brought into close contact with the end surface 5c of the outer element 5, and a bottom section 11c which extends further radially inwards from the flange section 11b.

[0048] According to this design, because the fitting section 11a is fitted onto the inner end section of the outer element 5 in a state where the flange section 11b is in close contact with the end surface 5c of the outer element 5, it is possible to easily and precisely position the sensor holder 10 with respect to the outer element 5 and thus accurately determine the wheel speed. The cover 11 is press-formed from a preserved non-magnetic steel sheet, such as a stainless steel sheet, e.g., an austenitic stainless steel sheet (JIS SUS 304, etc.). This makes it possible to provide a wheel bearing device connected to a wheel speed detection device that has no adverse effect on the detection performance of the wheel speed sensor 14 described later and can maintain reliability for a long time, while suppressing the formation of corrosion on the cover 11.

[0049] According to this embodiment, a fastening section 20 is formed on a radially outermost circumferential section (i.e., a circumferential section on a side away from the ground) of the base section 11c of the cover 11 such that it projects inwards. More precisely, as in Fig. As shown in Figure 4, a retaining section 12 is integrally connected to the mounting section, and the mounting section 20 is positioned within an inclination angle θ of 30° to 90° from a line perpendicular to the ground. A notch 20a is formed in the mounting section 20, and the retaining section 12 extends into the notch 20a and is integrally formed with the mounting section 20 over a region beyond the circumference of the mounting section 20 to the fitting section 11a. A cable harness 21 extends tangentially from the retaining section 12 to the cover 11 and is connected to the wheel speed sensor 14. This configuration allows the cable harness 21 to be routed slightly radially outward from the steering knuckle KN, thus facilitating its handling during assembly.

[0050] If the inclination angle θ is less than 30°, the cable harness 21 would have to be excessively bent relative to the retaining section 12 in order to route it radially away from the steering knuckle KN. This would adversely affect the internal wiring in the retaining section 12 and is undesirable. Conversely, if the inclination angle θ exceeds 90°, the length of the cable harness 21 would have to be unnecessarily extended, complicating assembly. This would not only impair machinability but also cause the cable harness 21 to interfere with the steering knuckle KN and other surrounding vehicle components.

[0051] Additionally, an elongated drainage opening 26 is formed in the bottom section 11c of the cover 11 at a position closest to the ground. This allows foreign materials such as muddy water or debris that might enter the bottom section 11c of the cover 11 during vehicle travel to be easily expelled and prevented from remaining there for extended periods. This prevents damage to surrounding vehicle components from solidified foreign materials.

[0052] The retaining section 12 is injection-molded from a non-magnetic, special resin material of the ether family, such as polyphenylene sulfide (PPS), containing 10 to 45 wt.% of a fiber reinforcement material made of glass fibers (GF). This makes it possible to provide a wheel bearing device with improved corrosion resistance, strength, and durability without any adverse effect on the locking performance of the wheel speed sensor 14. The inclusion of GF as reinforcing fibers allows the use of a semi-crystalline material at temperatures exceeding its glass transition temperature, thereby improving heat resistance. The increased modulus of elasticity also enhances the rigidity of the retaining section 12.

[0053] Regarding the amount of fiber-reinforced plastic (GF) to be incorporated into the resin, a sufficient effect cannot be expected if the amount is less than 10 wt.%, while on the other hand, if the GF exceeds 45 wt.%, the fibers in the molded object would cause anisotropy, thereby increasing the density and impairing dimensional stability. The holding section 12 can be formed not only with polypropylene polystyrene (PPS) but also with injectable resins such as polyamide (PA) 66, PA6-12, polybutylene terephthalate (PBT), etc. The fiber reinforcement material is not limited to GF; for example, carbon fibers (CF), aramid fibers, or boron fibers can be used.

[0054] The wheel speed sensor 14 is embedded in the retaining section 12 such that it is positioned opposite a magnetic encoder 16, described later, across a predetermined axial gap (air gap). The wheel speed sensor 14 comprises a magnetic locking element, such as a Hall effect element, a magnetic resistance element (MR), etc., which changes its properties according to the direction of the magnetic flux, and an integrated circuit connected to a waveform rectifier for rectifying the output waveform of the magnetic locking element. This enables the wheel speed to be determined with high reliability and at low cost. In addition to the materials mentioned above, the retaining section 12 can be made of injectable resins such as polyamide (PA) 66, polyphthalamide (PPA), polybutylene terephthalate (PBT), etc.The retaining section 12 can be formed integrally with the fastening section 20 of the cover 11 by overmolding.

[0055] As in Fig. Figure 2 shows a centrifugal ring 15 press-fitted onto the inner ring 2 such that it is axially opposite the retaining section 12. The centrifugal ring 15 forms part of the inner seal 9 and comprises a cylindrical section 15a, which is press-fitted onto the inner ring 2, and a raised section 15b, which extends radially outward from the cylindrical section 15a. The centrifugal ring 15 is press-formed from a ferromagnetic steel sheet, such as ferritic stainless steel sheet (JIS SUS 430, etc.) or preserved cold-rolled sheet (JIS SPCC, etc.), such that it has a substantially L-shaped cross-section. The magnetic encoder 16 is an elastomer, such as rubber, mixed with a magnetic powder, such as ferrite, and is integrally bonded to the inner surface of the raised section 15b of the centrifugal ring 15 via a vulcanized adhesive bond.The magnetic encoder 16 forms a rotary encoder for determining the wheel speed, which has north and south poles arranged alternately along its circumference.

[0056] The inner seal 9 is formed from a so-called "packing seal" comprising the centrifugal ring 15 and an annular sealing plate 17, which has a substantially L-shaped cross-section and is suitable for being attached to the outer element 5 opposite the centrifugal ring 15. The sealing plate 17 comprises a core metal 18, which fits into the inner end of the outer element 5, and a sealing element 19, which is bonded to the core metal 18 by means of a vulcanized adhesive. The core metal 18 is press-formed from a ferritic stainless steel sheet (JIS SUS 430, etc.) or a preserved cold-rolled sheet (JIS SPCC, etc.) such that it has a substantially L-shaped cross-section.

[0057] The sealing element 19, in turn, is formed from an elastic material such as synthetic rubber and comprises a side lip 19a, which is in sliding contact with the raised section 15b, a grease-lubricating lip 19b, and a center lip 19c, which are in sliding contact with the cylindrical section 15a. The outer circumferential edge of the raised section 15b of the centrifugal ring 15 is positioned opposite the core metal 18 via a small radial gap to form a labyrinth seal.

[0058] In this embodiment, the flange section 11b of the cover 11 is designed to have a flat surface, providing a contact width β of 5 mm or more with the end face 5c of the outer element 5. If a contact width β of 5 mm cannot be ensured, it is designed so that, with respect to a flat width α of the end face 5c, a contact width β of 50% or more of the flange section 11b can be obtained (β / α ≥ 0.5). This makes it possible to provide a wheel bearing device connected to a wheel speed detection device, which can improve the positioning accuracy of the cover by achieving close contact between the cover and the outer element. This prevents the cover from being press-fitted onto the outer element at an angle or incorrectly, and thus improves both the assembly accuracy of the sensor holder and the locking accuracy.

[0059] If such a setup value cannot be ensured, an essentially equivalent effect can be obtained, for example, by modifying the thickness and dimensions of chamfered sections of the cover 11. In contrast to the prior art sensor holder, in which the base section is formed such that it projects axially from the flange section of the cover, and the retaining section is connected to the inside of the base section, the base section 11c according to the present invention is formed such that it extends radially inwards from the flange section 11b of the cover 11, the mounting section 20 is formed such that it projects from the base section 11c towards the inside, and the retaining section 12 is arranged beyond the outer circumference of the mounting section 20 to the fitting section 11a.Accordingly, this makes it possible to increase the flat surface area by extending the flange section 11b further radially inwards, while preserving the space for the retaining section 12. Although in this embodiment a

[0060] In addition to the active type wheel speed detection device shown, which includes the magnetic encoder 16 and the wheel speed sensor 14, which includes magnetic locking elements such as Hall effect elements, it is possible to use a passive type wheel speed detection device which includes, for example, gears, a magnet and a ring-shaped coil, etc. Second embodiment

[0061] Fig. Figure 5 is a longitudinal section view of a second embodiment of a wheel bearing device of the present invention connected with a wheel speed detection device, Fig. Image 6 is a partially enlarged view of Fig. 5, which shows the locking section, Fig. Figure 7 is a side elevation view showing the wheel bearing assembly before the sensor holder is attached. Fig. Figure 8 is a side elevation view of Fig. 5, Fig. Figure 9 is a front elevation view, which is a variation of Fig. 7 shows the wheel bearing device before the sensor holder is attached, Fig. 10 is a front elevation view of Fig. 9, which shows the wheel bearing assembly after the sensor holder has been attached, Fig. 11(a) is a partially enlarged view showing a composite state of Fig. 10 shows, and Fig. 11(b) is a partially enlarged view, which is a modification of Fig. Figure 11(a) shows that the second embodiment differs from the first embodiment essentially only in the construction of the sensor holder. Accordingly, the same reference numerals are used in this embodiment to designate the same sections, parts, or functions as in the first embodiment.

[0062] The wheel bearing device has a structure of so-called “third generation” and comprises an inner element 3, which includes a wheel hub 1 and an inner ring 2, and an outer element 5, which is fitted onto the inner element 3 via two rows of rolling elements (balls) 4, 4.

[0063] In this embodiment, a sensor holder 27 is attached to the inner end of the outer element 5. This sensor holder 27 comprises a cup-shaped cover 28 and a retaining section 29 connected to the cover 28. The cover 28 is press-formed from a preserved non-magnetic steel sheet, such as a stainless steel sheet, e.g., an austenitic stainless steel sheet (JIS SUS 304, etc.). This makes it possible to provide a wheel bearing device connected to a wheel speed detection device that has no adverse effect on the detection performance of the wheel speed sensor 14 and can maintain reliability for a long time, while suppressing the formation of corrosion on the cover 28.

[0064] The cover 28 is designed to have a generally annular shape and comprises a cylindrical fitting section 28a, which is press-fitted onto the outer circumference of the inner end of the outer element 5; a flange section 28b, which extends radially inward from the fitting section 28a and is suitable for being brought into close contact with the end face 5c of the outer element 5; and a bottom section 28c, which extends further radially inward from the flange section 28b. According to this design, because the cover 28 is press-fitted onto the inner end section of the outer element 5 in a state where the flange section 28b is in close contact with the end face 5c of the outer element 5, it is possible to easily and precisely position the sensor holder 27 with respect to the outer element 5 and thereby accurately determine the wheel speed.

[0065] A fastening section 30 is formed on a radially outer circumferential section (i.e., a circumferential section on a side away from the ground) of the base section 28c of the cover 28 such that it projects inwards. More precisely, the fastening section 30 is as shown in Fig. Figure 8 shows the mounting section 30 arranged such that it is positioned within a range of an inclination angle θ of 30° to 90° from a line perpendicular to the ground. A notch 30a is formed in the mounting section 30, and the retaining section 29 extends into the notch 30a and is thus formed in one piece. A cable harness 21 extends tangentially from the retaining section 29 to the cover 28 and is connected to the wheel speed sensor 14. This arrangement allows the cable harness 21 to be routed slightly radially outwards from the steering knuckle KN, thereby facilitating machining during assembly. The retaining section 29 can be integrally connected to the mounting section 30 of the cover 28 by means of an insert molding.

[0066] If the inclination angle θ is less than 30°, the cable harness 21 would have to be excessively bent relative to the retaining section 29 in order to route it radially away from the steering knuckle KN. This would adversely affect the internal wiring in the retaining section 29 and is undesirable. Conversely, if the inclination angle θ exceeds 90°, the length of the cable harness 21 would have to be unnecessarily extended, complicating assembly. This would not only impair machinability but also cause the cable harness 21 to interfere with the steering knuckle KN and other surrounding vehicle components.

[0067] Additionally, an elongated drainage opening 26 is formed in the bottom section 28c of the cover 28 at a position closest to the ground. This allows foreign materials such as muddy water or debris that might enter the bottom section 28c of the cover 28 during vehicle travel to be easily expelled and prevents them from remaining there for extended periods. This helps prevent damage to surrounding vehicle components from solidified foreign materials.

[0068] The wheel speed sensor 14 is embedded in the retaining section 29. The retaining section 29 is injection-molded from a non-magnetic, special resin material of the ether family, such as polyphenylene sulfide (PPS), containing a fiber reinforcement material such as GF. This makes it possible to provide a wheel bearing device with improved corrosion resistance, strength, and durability without any adverse effect on the locking performance of the wheel speed sensor 14. In addition to the materials mentioned above, the retaining section 29 can be formed from injectable resins such as PA 66, PPA, PBT, etc.

[0069] In this embodiment, an inner end surface 5c of the outer element 5 is formed as shown in Fig. Figure 7 shows a predetermined marking 31. This marking 31 is formed by a laser marking process as a point on a phase corresponding to the holding section 29 of the sensor holder 27. The marking 31 can also be formed by painting.

[0070] On the other hand, a mark 32 is formed by painting it at a predetermined position on the side surface of the retaining section 29 of the sensor holder 27. This mark 32 is formed as a point at a position corresponding to the wheel speed sensor 14. The sensor holder 27 can be attached to the outer element 5 during the assembly step of the sensor holder 27 by aligning the mark 31 of the outer element 5 with the mark 32 of the retaining section 29. This makes it possible to attach the sensor holder 27 precisely to the outer element 5 while observing each mark, improving the machinability during the assembly of the bearing device and thereby providing a wheel bearing device with improved reliability in conjunction with a wheel speed detection device. The mark 32 of the sensor holder 27 can be made by notching it simultaneously with the formation of the retaining section 29.

[0071] Fig. Figure 9 shows a modification of the assembly method described above. In this modification, a marking 33 is formed on the outer circumference of the inner end of the outer element 5. This marking 33 is formed by laser marking as a band on a chamfer that corresponds to the retaining section 29 of the sensor holder 27.

[0072] In contrast, as in Fig. As shown in Figure 10, a mark 34 is formed on the outer circumference of the fitting section 28a of the cover 28 of the sensor holder 27. This mark 34 is formed as a band at a position corresponding to the wheel speed sensor 14. The sensor holder 27 can be fitted onto the outer element 5 by aligning the mark 33 of the outer element 5 and the mark 34 of the cover 28 as shown in Figure 10. Fig. 11(a) shown to be aligned with each other. This makes it possible to precisely attach the sensor holder 27 to the outer element 5 by observing the markings 33, 34, in order to further improve the positioning accuracy of the sensor holder 27 with respect to the outer element 5 and the machinability during assembly of the bearing device.

[0073] The marking can be done as in Fig. 11(b) another modification. In this modification, the marking 33 is formed on the outer circumference of the inner end of the outer element 5, and a marking 35 in the form of a dot is formed on the outer circumference of the retaining section 29 of the sensor holder 27. The sensor holder 27 can be attached to the outer element 5 by aligning these markings 33 and 35 with each other. Third embodiment

[0074] Fig. Figure 12 is a longitudinal section view of a third embodiment of a wheel bearing device of the present invention connected with a wheel speed detection device, and Fig. Figure 13 is an explanatory view showing the construction of the sensor holder. Fig. Figure 12 shows that the third embodiment differs from the second embodiment essentially only in the construction of the wheel speed sensor. Accordingly, the same reference numerals are used in this embodiment to designate the same sections, parts, or functions as in the preceding embodiments.

[0075] In this embodiment, the sensor holder 27 is attached to the inner end of the outer element 5. This sensor holder 27 comprises the cup-shaped cover 28 and the retaining section 29 connected to the cover 28.

[0076] A in Fig. The wheel speed sensor 36 shown in Figure 12 is arranged opposite a magnetic encoder 16 across a predetermined axial gap (air gap) and comprises a magnetic locking element that changes its properties according to the direction of the magnetic flux, such as a Hall effect element or a magnetic resistance element (MR element), etc., an integrated circuit 36a connected to a waveform circuit for rectifying the output waveform from the magnetic locking element, and a connecting wire 36b. The output of the wheel speed sensor 36 is sent via the cable harness 21 to a controller of an ABS (not shown). This makes it possible to determine the wheel speed with high reliability and at low cost, and to reduce the size of the bearing device.

[0077] In this embodiment, some sections of the retaining section 29 of the sensor holder 27 are limited to predetermined dimensions. As shown in Fig. Figure 13 shows that the axial dimension G of the retaining section 29 is defined as G = A + B + C + D + E + F, where A is a forming thickness between the locking surface (the outer end face) of the retaining section 29 and the integrated circuit 36a, B is a thickness of the integrated circuit 36a, C is a distance between the integrated circuit 36a and the center of the cable harness 21, D is a radius of the cable harness 21, E is a forming thickness between the cable harness 21 and the inner end face of the retaining section 29, and F is a distance between the contact surface of the flange section 28b of the cover 28 with the end face 5c of the outer element 5 and the locking surface of the retaining section 29.

[0078] To prevent damage to the retaining section 29 from a tensile force exerted on it by the cable harness 21, it is necessary to ensure that the axial forming thickness of a section where the cable harness 21 is positioned is at least E = 1.0 mm and C = 3.0 mm. And to prevent damage to the integrated circuit 36a from foreign matter that has penetrated between the inner surface of the magnetic encoder 16 and the locking surface of the retaining section 29, it is necessary to ensure that the axial forming thickness of a section where the integrated circuit 36a is positioned is at least A = 0.5 mm.Assuming that the thickness B of a commonly used integrated circuit 36a is 1.6 mm, the radius D of the cable harness is 2.0 mm, and the dimension F, taking into account the necessary air gap and a positioning error of the centrifugal ring 15, is 0.4 mm, the minimum extent of the axial projection G of the retaining section 29 from the end face 5c of the outer element 5 is expressed as G = A + B + C + D + E + F = 0.5 + 1.6 + 3.0 + 2.0 + 1.0 + 0.4 = 8.5 mm. Considering the interfering engagement of the retaining section 29 with surrounding parts (e.g., the constant velocity joint, not shown), it is preferred that the extent of the axial projection of the retaining section 29 be 20 mm or less.

[0079] The radial dimension N of the retaining section 29 is defined as N = H + J + K + L + M, where H is a forming thickness between the outer circumference of the retaining section 29 and the cable harness 21, J is a distance between the outer circumference of the cable harness 21 and the conductor wires 36b, K is a distance between a bent section of the conductor wires 36b and the integrated circuit 36a, L is a radial width of the integrated circuit 36a, and M is a forming thickness between the integrated circuit 36a and the inner circumference of the retaining section 29.

[0080] To prevent damage to the retaining section 29 by a tensile force exerted on it by the cable harness 21, it is necessary to ensure that the radial forming thickness of a section on which the cable harness 21 is positioned is at least H = 1.0 mm and M = 1.0 mm. Based on the actual dimensions of a commonly used wheel speed sensor 36, the minimum radial dimension N of the retaining section, assuming that J is 1.5 mm, K is 1.5 mm, L is 3.5 mm, and M is 1.0 mm, is expressed as N = H + J + K + L + M = 1.0 + 1.5 + 1.5 + 3.5 + 1.0 = 8.5 mm. Taking into account the disruptive interference of the retaining section 29 with surrounding parts (e.g. the constant velocity joint, not shown), it is preferred that the extent of the radial dimension N of the retaining section 29 is 15 mm or less.

[0081] Accordingly, it is possible to optimize the dimensions of the sensor holder 27 by calculating the dimensions of the holding section 29 of the sensor holder 27 and applying them at optimized values, thereby providing a wheel bearing device connected with a wheel speed detection device that can improve the strength and rigidity of the holding section 29 and prevent disruptive interference of the holding section 29 with surrounding parts in order to improve the reliability of the wheel bearing device. Fourth embodiment

[0082] Fig. Figure 14 is a longitudinal section view of a fourth embodiment of a wheel bearing device of the present invention connected with a wheel speed detection device, and Fig. 15 is a partially enlarged view of Fig. 14. This embodiment differs from the second embodiment essentially only in the design of the sensor holder. Accordingly, the same reference numerals are used in this embodiment to designate the same sections, parts, or functions as in the preceding embodiments.

[0083] In this embodiment, a sensor holder 37 is attached to the inner end of the outer element 5. This sensor holder 37 comprises the cup-shaped cover 38 and the retaining section 39 connected to the cover 38. The cover 38 is press-formed from a preserved non-magnetic steel sheet, such as a stainless steel sheet, e.g., an austenitic stainless steel sheet (JIS SUS 304, etc.). This makes it possible to provide a wheel bearing device connected to a wheel speed detection device that has no adverse effect on the detection performance of the wheel speed sensor 14 and can maintain reliability for a long time, while suppressing the formation of corrosion on the cover 38.

[0084] The cover 38 is designed to have a generally annular shape and comprises the cylindrical fitting section 11a, which is press-fitted onto the outer circumference of the inner end of the outer element 5; the flange section 11b, which extends radially inward from the fitting section 11a and is suitable for being brought into close contact with the end face 5c of the outer element 5; and a base section 38a, which extends further radially inward from the flange section 11b. According to this design, because the cover 38 is press-fitted onto the inner end section of the outer element 5 in a state where the flange section 11b is in close contact with the end face 5c of the outer element 5, it is possible to easily and accurately position the sensor holder 37 with respect to the outer element 5 and thereby accurately determine the wheel speed.

[0085] The fastening section 20 is formed on a radially outer circumferential section (i.e., a circumferential section on a side away from the ground) of the base section 38a of the cover 38 such that it projects inwards. A round opening 20b is formed in the fastening section 20, allowing the resin retaining section 39 to be integrally joined to the cover 38 by means of an insert molding. This enables the retaining section 39 to be firmly attached to the cover 38. Accordingly, it is possible to ensure close contact between the retaining section 39 and the cover 38, even when the bearing device is used under harsh conditions such as repeated changes in high and low temperatures, thereby preventing separation of the insert-molded retaining section 39 from the cover 38.

[0086] The wheel speed sensor 14 is embedded in the retaining section 39. The retaining section 39 is injection-molded from a non-magnetic, special resin material of the ether family, such as polyphenylene sulfide (PPS), containing a fiber reinforcement material such as GF. This makes it possible to provide a wheel bearing device with improved corrosion resistance, strength, and durability without any adverse effect on the locking performance of the wheel speed sensor 14. In addition to the materials mentioned above, the retaining section 39 can be formed from injectable resins such as PA 66, PPA, PBT, etc.

[0087] In this embodiment, the centrifugal ring 15 is positioned and fastened such that the inner surface of the magnetic encoder 16 is in the same plane as that of the end surface of the inner ring 2 or in a position slightly recessed from it towards the inside of the bearing device (the outside of the vehicle), and the outer surface of the retaining section 39 is arranged so that it does not project from the inner surface of the bottom section 38a of the cover 38. This prevents damage to the surfaces of the magnetic encoder 16 or the retaining section 39 by foreign matter such as mud or debris blown off by centrifugal force.This makes it possible to maintain the gap between the magnetic encoder 16 and the locking section of the wheel speed sensor 14 stably and accurately for a long time, in order to improve the reliability of the wheel speed detection.

[0088] A distance L1 between the inner surface of the bottom section 38a of the cover 38 and the magnetic encoder 16 is set to within 3 mm to ensure a desired air gap and prevent direct ingress of mud, water, etc. The distance δ between the outer surface of the retaining section 39 and the inner surface of the bottom section 38a is set to within 0 to 0.1 mm. If the distance δ exceeds 0.1 mm, the air gap between the magnetic encoder 16 and the magnetic locking element (locking section) of the wheel speed sensor 14 becomes too large, reducing the flux density and impairing the locking accuracy. Fifth embodiment

[0089] Fig. Figure 16 is a longitudinal section view of a fifth embodiment of a wheel bearing device of the present invention connected with a wheel speed detection device, and Fig. 17 is a partially enlarged view of Fig. 16. This embodiment differs from the fourth embodiment essentially only in the design of the sensor holder. Accordingly, the same reference numerals are used in this embodiment to designate the same sections, parts, or functions as in the preceding embodiments.

[0090] This wheel bearing device has a structure of so-called “third generation” and comprises an inner element 3, which includes a wheel hub 1 and an inner ring 2, and an outer element 5, which is fitted onto the inner element 3 via two rows of rolling elements (balls) 4, 4 and is connected to a constant velocity joint 13.

[0091] In this embodiment, a sensor holder 40 is attached to the inner end of the outer element 5. This sensor holder 40 comprises a cup-shaped cover 41 and the retaining section 42 connected to the cover 41. As shown in the enlarged view of Fig. As shown in Figure 17, the cover 41 comprises the cylindrical fitting section 11a, which is press-fitted onto the outer circumference of the inner end of the outer element 5, the flange section 11b, which extends radially inward from the fitting section 11a and is suitable for being brought into close contact with the end face 5c of the outer element 5, and a fastening section 41a, which extends further radially inward from the flange section 11b. The cover 41 is press-formed from a preserved non-magnetic steel sheet, such as a stainless steel sheet, e.g., an austenitic stainless steel sheet (JIS SUS 304, etc.).

[0092] In the mounting section 41a of the cover 41, several round openings 20b are formed along the circumference of the mounting section 41a, so that a retaining section 42 made of resin can be integrally connected to the cover 41 by overmolding. The wheel speed sensor 14 is embedded in the retaining section 42 at a radially outer position such that it is axially opposite the magnetic encoder 16. Accordingly, it is possible to ensure close contact between the retaining section 42 and the cover 41, even when the bearing device is used under harsh conditions, and thus prevent separation of the insert-molded retaining section 42 from the cover 41. The retaining section 42 is injection-molded from a special resin material of the ether family, such as polyphenylene sulfide (PPS), which contains a fiber reinforcement material such as GF.

[0093] In this embodiment, the retaining section 42 is formed in a generally annular shape with a substantially rectangular cross-section. An inner circumferential surface 42a of the retaining section 42 faces the shoulder 23 of the outer joint element 22 via a small radial gap to form a labyrinth seal γ. This makes it possible to improve the sealing of the locking section and thereby prevent the ingress of mud and debris into the bearing device and improve its reliability over a long period of time.

[0094] Additionally, a distance L2 between the outer surface of the retaining section 42, which forms the locking section of the wheel speed sensor 14, and the inner surface of the magnetic encoder 16 is set to within 3 mm to ensure a desired air gap and prevent the direct ingress of mud or debris into the inner seal 9. The radial gap between the retaining section 42 and the shoulder 23 of the outer joint element 22 is preferably set to within 0.5 to 3.0 mm. This prevents interfering interference between them and ensures the sealing of the locking section. Sixth embodiment

[0095] Fig. Figure 18 is a longitudinal section view of a sixth embodiment of a wheel bearing device of the present invention connected with a wheel speed detection device, Fig. 19 is a partially enlarged view of Fig. 18, which shows the locking section, Fig. Figure 20 is an explanatory view showing the construction of the sensor holder. Fig. 19 shows, Fig. 21 is a side elevation view of Fig. 18, and Fig. 22(a) is a longitudinal section view, or Fig. 22(b) A front elevation view of a cover. This embodiment differs from the previous embodiments essentially only in the construction of the sensor holder. Accordingly, the same reference numerals are used in this embodiment to designate the same sections, parts, or functions as in the previous embodiments.

[0096] In this embodiment, a sensor holder 43 is attached to the inner end of the outer element 5. This sensor holder 43 comprises the cup-shaped cover 44 and a retaining section 45 connected to the cover 44. The cover 44 is press-formed from a preserved non-magnetic steel sheet, such as a stainless steel sheet, e.g., an austenitic stainless steel sheet (JIS SUS 304, etc.). This makes it possible to maintain reliability for a long time while suppressing the formation of corrosion on the cover 44, without having any adverse effect on the detection performance of the wheel speed sensor 36.

[0097] As in Fig. As shown in Figure 19, the cover 44 is formed to have a generally annular shape and comprises a cylindrical fitting section 44a, which is press-fitted onto the outer circumference of the inner end of the outer element 5; a flange section 44b, which extends radially inward from the fitting section 44a and is suitable for being brought into close contact with the end face 5c of the outer element 5; and a bottom section 44c, which extends further radially inward from the flange section 44b. The retaining section 45 is formed in one piece over its entire circumference in a region from the flange section 44b to the bottom section 44c.According to this design, due to the fact that the cover 44 is fitted onto the inner end section of the outer element 5 in a state in which the flange section 44b is in close contact with the end surface 5c of the outer element 5, it is possible to position the sensor holder 43 easily and precisely with respect to the outer element 5 and thereby accurately determine the wheel speed.

[0098] As in Fig. As shown in Figure 22, a notch 20a is formed on a radially outer circumferential section (i.e., a circumferential section on a side away from the ground) of the base section 44c of the cover 44, and the wheel speed sensor 36 is embedded in the notch 20a in the retaining section 45. Additionally, several through-holes 46 are punched along the circumference of the base section 44c, and the resin used to form the retaining section 45 flows into these openings 46 to be firmly attached to the cover 44 without any separation between them.

[0099] An elongated drain opening 47 is formed on a radially outer circumferential section (i.e., a circumferential section on a side closest to the ground) of the bottom section 44c of the cover 44. This allows foreign matter, such as muddy water or debris, which might enter the bottom section 44c of the cover 44 during vehicle travel, to be easily expelled and prevents it from remaining there for extended periods. This helps prevent damage to surrounding vehicle components from solidified foreign matter.

[0100] The retaining section 45 is injection-molded from a non-magnetic, special resin material of the ether family, such as polyphenylene sulfide (PPS), containing 10 to 45 wt.% of a fiber reinforcement material made of GF. This makes it possible to provide a wheel bearing device with improved corrosion resistance, strength, and durability without any adverse effect on the locking performance of the wheel speed sensor 36. This allows the use of a semi-crystalline material at temperatures exceeding its glass transition temperature, thereby improving heat resistance, rigidity, and dimensional stability due to an increase in the modulus of elasticity.

[0101] Regarding the amount of fiber-reinforced plastic (GF) to be incorporated into the resin, a sufficient effect cannot be expected if the amount is less than 10 wt.%, while conversely, if the GF exceeds 45 wt.%, the fibers in the molded object would cause anisotropy, thereby increasing the density and impairing dimensional stability. The 45 wt.% holding section can be formed not only by polypropylene polystyrene (PPS) but also by injectable resins such as polyamide (PA) 66, PA6-12, polybutylene terephthalate (PBT), etc. The fiber reinforcement material is not limited to GF; for example, carbon fibers (CF), aramid fibers, or boron fibers can be used.

[0102] According to this embodiment, as shown in Fig. Figure 19 shows that part of the retaining section 45, in which the wheel speed sensor 36 is embedded, has a substantially rectangular cross-section. On the other hand, in the other part of the retaining section 45, which is suitable for being pressed by a press tool during the attachment of the sensor holder 43 to the outer element 5 (i.e., a part L in Fig. 19, which is defined between an outer diameter Dh of the retaining section 45 and an inner diameter Do of the end of the outer element 5), no parts relating to the wheel speed sensor 36, such as the integrated circuit 36a or the connecting wires 36b, are arranged. This makes it possible to prevent the parts relating to the wheel speed sensor 36 from being damaged, even if the retaining section 45 is pressed by a press tool during its installation.

[0103] In a separate part from the part in which the wheel speed sensor 36 is embedded, a thin-walled inner circumferential section 45a is formed on one side of the bottom section 44c of the cover 44, and a thick-walled outer circumferential section 45b is also formed radially outside the inner circumferential section 45a and axially projecting from it. The retaining section 45 is formed such that it has an outer diameter Dh that is the same as or slightly smaller than the outer diameter of the fitting section 44a of the cover 44 (Dh ≤ Da + 2t), where 't' is a thickness of the cover 44. This maximizes the space of the retaining section 45 that is pressed by the press fitting tool, thereby reducing stress inducing in the retaining section 45 and preventing deformation and damage to the retaining section 45.

[0104] Additionally, the inner surface of the retaining section 45 is designed to have a coplanar shape over its entire circumference. This allows the press tool to press a pressing area W of the retaining section 45 substantially uniformly over its entire circumference, thereby reducing the stress caused in the retaining section 45 and preventing deformation and damage. Furthermore, the flange section 44b of the cover 44 can be brought into close contact with the end surface 5c of the outer element 5, thereby establishing the air gap between the magnetic encoder 16 and the wheel speed sensor 36 at a predetermined value to improve sealing.Furthermore, because the fastening force of the cover 44 can be ensured, it is possible to reliably prevent faulty operation of an ABS resulting from axial and circumferential movements of the sensor holder 43 caused by vibrations or shocks during vehicle operation, thereby improving reliability while maintaining the desired locking accuracy over a long period. The term "coplanar" signifies a target value in the design of a shape without a significant step in it, which is why a step caused by a machining error should be expected. Seventh embodiment

[0105] Fig. Figure 23 is a longitudinal section view of a seventh embodiment of a wheel bearing device of the present invention connected with a wheel speed detection device, Fig. 24 is a partially enlarged view of Fig. 23, which shows the locking section, Fig. 25 is a view from an arrow III-III, Fig. 26 is a partially sectioned view along a line VI-VI of Fig. 25, and Fig. 27 is a partially cropped view of the modification of Fig. 26. This embodiment differs from the previous embodiments essentially only in the design of the inner seal and the sensor holder. Accordingly, the same reference numerals are used in this embodiment to designate the same sections, parts, or functions as in the previous embodiments.

[0106] This wheel bearing device has a so-called “third generation” design for a drive wheel and comprises an inner element 49, which includes a wheel hub 48 and the inner ring 2, and an outer element 50, which is fitted onto the inner element 49 via two rows of rolling elements 4, 4 and is connected to a constant velocity joint 13.

[0107] The inner element 49 comprises the wheel hub 48 and the inner ring 2 attached to the wheel hub 48. The wheel hub 48 has the wheel mounting flange 6 at its outer end, the outer inner running surface 1a on its outer circumference, and the cylindrical section 1b extending from the inner running surface 1a.

[0108] The wheel hub 48 is made of medium / high carbon steel, such as S53C, which contains 0.40 to 0.80 wt.% carbon, and is finished with a hardened layer. This layer, hardened by high-frequency induction hardening, extends from the inner base 6b of the wheel mounting flange 6, across the inner raceway surface 1a, to the cylindrical section 1b, achieving a surface hardness of 58 to 64 HRC. A riveting section 1d is not hardened and retains its post-forging surface hardness.

[0109] The outer element 50 is made of steel with a medium / high carbon content such as S53C, which contains 0.40 to 0.80 wt.% carbon, and is provided on its outer circumference with a mounting flange 5b for attachment to a steering knuckle (not shown) and on its inner circumference with two rows of outer raceway surfaces 5a, 5a, which correspond to the two rows of inner raceway surfaces 1a, 2a of the inner element 49.

[0110] In this bearing arrangement, the end face of the smaller diameter side (the outer side) of the inner ring 2 abuts the shoulder of the wheel hub 48, thus forming a double-row angular contact ball bearing of a so-called back-to-back duplex type. Seals 8, 51 are installed in the annular space between the outer element 50 and the inner element 49 to prevent leakage of lubricating grease trapped in the bearing arrangement and the ingress of rainwater or dust into the bearing arrangement.

[0111] A constant velocity joint 13 comprises an outer joint element 22, an inner joint ring 52, a cage 53 and torque-transmitting balls 54. The outer joint element 22 has a one-piece cup-shaped mouth section 55, a shoulder 23 forming a base of the mouth section 55, and a shaft section 24 extending axially from the shoulder 23.

[0112] In this embodiment, the sensor holder 56 is attached to the inner end of the outer element 50. The inner seal 51 is located in an annular space formed between the sensor holder 56 and the inner ring 2. As shown in Fig. As shown in Figure 24, the seal 51 comprises an annular sealing plate 57 and a centrifugal ring 58, each having a substantially L-shaped cross-section and arranged opposite one another. The sealing plate 57 comprises a core metal 59, with which the sensor holder 56 is formed and whose exposed section fits into the end of the outer element 50, and a sealing element 60, which is integrally bonded to the core metal 59 by means of a vulcanized adhesive. A pulse ring 61 is fitted onto the centrifugal ring 58.

[0113] The core metal 59 is, for example, press-formed from an austenitic stainless steel sheet (JIS SUS 304, etc.), a ferritic stainless steel sheet (JIS SUS 430, etc.), or a preserved cold-rolled sheet (JIS SPCC, etc.) and comprises a cylindrical section 59a, with which the sensor holder 56 is integrally formed, and an inner circumferential section 59b extending radially inward from the cylindrical section 59a. A partially exposed portion of the cylindrical section 59a is fitted into the end of the outer element 50. This allows a strong force to be exerted on the sensor holder 56 to prevent it from being pulled out and improves the sealing of the fitting section. The core metal 59 is preferably formed from a non-magnetic austenitic stainless steel sheet to prevent the locking performance of the wheel speed sensor 64 from being adversely affected.

[0114] The sealing element 60 is made of synthetic rubber such as NBR (acrylonitrile butadiene rubber) and is integrally bonded to the inner circumferential section 59b of the core metal 59 via a vulcanized adhesive bond. The sealing element 60 has a one-piece side lip 60a and a pair of radial lips 60b, 60c.

[0115] The centrifugal ring 58 is, for example, press-formed from an austenitic stainless steel sheet (JIS SUS 304 etc.), a ferritic stainless steel sheet (JIS SUS 430 etc.) or a preserved cold-rolled sheet (JIS SPCC etc.) and comprises a cylindrical section 58a which is press-fitted onto the outer circumference of the inner ring 2, and a raised section 58b which extends radially outwards from the cylindrical section 58a.

[0116] The impulse ring 61 comprises a core metal 62, which is press-fitted onto the centrifugal ring 58, and a magnetic encoder 63, which is integrally bonded to the core metal 62 via a vulcanized adhesive bond. The core metal 62 of the impulse ring 61 is press-formed from a ferritic stainless steel sheet (JIS SUS 430, etc.) or a preserved cold-rolled sheet (JIS SPCC, etc.) such that it has a substantially C-shaped cross-section and comprises a cylindrical inner circumference 62a, which is press-fitted onto the cylindrical section 58a of the centrifugal ring 58, a raised section 62b extending radially outward from the inner circumference 62a, and an outer circumference 62c extending axially from the raised section 62b. The magnetic encoder 63 is integrally bonded to the outer circumference 62c via a vulcanized adhesive bond.The side lip 60a of the sealing element 60 is in sliding contact with the raised section 62b of the core metal 62 of the impulse ring 61, and the pair of radial lips 60b, 60c is in sliding contact with the cylindrical section 58a of the centrifugal ring 58.

[0117] The magnetic encoder 63 is a rubber magnet formed from an elastomer mixed with a magnetic powder such as ferrite. It forms a rotary encoder for determining wheel speed and has north and south poles arranged alternately along its circumference. This, in conjunction with the ferromagnetic core metal 62, enables stable detection sensitivity to be achieved.

[0118] The seal 51 prevents the impulse ring 61 from becoming contaminated by dust, etc. Additionally, because the magnetic encoder 63 is insulated from the rolling elements 4 and each raceway surface by the side lip 60a of the sealing plate 57, which is in sliding contact with the impulse ring 61, and the radial lips 60b, 60c, it is possible to prevent abrasion-caused metal powder, etc., generated by the rotation of the rolling elements 4, from being deposited on and adhering to the magnetic encoder 63.

[0119] The sensor holder 56 is injection-molded from a non-magnetic resin material such as polyphenylene sulfide (PPS) containing a fiber reinforcement material made of GF. The wheel speed sensor 64 is embedded in the holding section of the sensor holder 56 and faces the magnetic encoder 63 via a predetermined radial gap (air gap). This makes it possible to improve corrosion resistance, strength, and durability without adversely affecting the locking performance of the wheel speed sensor 64. The wheel speed sensor 64 comprises a magnetic locking element 64a, such as a Hall effect element, a magnetic resistance element (MR element), etc., which changes its properties according to the direction of the magnetic flux, and the integrated circuit 64c, which is connected via a lead wire 64b to a waveform circuit for rectifying the output waveform of the magnetic locking element 64a.This enables the wheel speed to be determined with high reliability and at low cost. The sensor holder 56 can be made from injectable synthetic resins such as polyamide (PA) 66 and polyethylene terephthalate, etc., in addition to the materials mentioned above. The embodiment of the wheel speed sensor 64, which is described in... Fig. Figure 24 is merely an example, and an integrated circuit can be used in which the magnetic locking element 64a and the waveform circuit are integrated.

[0120] As in Fig. 25 shows the sensor holder 56 at a predetermined circumferential position (the vertically uppermost position in Fig. 25) A section 65 for routing is formed, which projects from the sensor holder 56. A cable harness 66, which is directly connected to the integrated circuit 64c of the wheel speed sensor 64, is formed integrally with the routing section 65. A connector 67 for connecting to a cable harness (not shown) that is connected to an electronic circuit on a vehicle body is attached to the end of the cable harness 66. A clamp 68 for securing the cable harness 66 is anchored at an angle θ within 90° of the routing section 65 on a side face of the sensor holder 56. This makes it possible to shorten the length of the cable harness 66 extending circumferentially from the sensor holder 56 and thereby prevent the generation of vibrations of the cable harness 66 during vehicle operation.Accordingly, it is possible to provide a wheel bearing device connected with a wheel speed detection device, which can improve the durability of the cable harness 66 and the reliability of the bearing device due to stable speed detection and can prevent the sensor holder 56 from being pulled out by the influence of vibrations from external elements.

[0121] The clamp 68 is press-formed from an austenitic stainless steel sheet (JIS SUS 304, etc.) or a preserved cold-rolled sheet (JIS SPCC, etc.) such that it has a substantially C-shaped cross-section and is integrally attached to the sensor holder 56 during the injection molding process. The cable harness 66 can be easily attached to and connected with the side surface of the sensor holder 56 by aligning both ends of the clamp 68 as indicated by the arrows in the figure. Fig. 26 shown bent. This makes it possible to reliably prevent the generation of vibrations in the cable harness 66 while a vehicle is in motion.

[0122] Although it is shown as an example that the section 65 for leading out is formed on the sensor holder 56 while projecting tangentially from it to the inside, and the cable harness 66 is directly formed with the section 65 for leading out, and that the connector 67 is connected to the end of the cable harness 66, it may be possible to use a configuration in which a connector is integrally formed with the sensor holder while projecting tangentially from it, and a cable harness connected to the electronic circuit on a vehicle body is connected to the connector, and the cable harness is secured by a clamp on the side surface of the sensor holder.

[0123] The means for attaching the cable harness 66 to the sensor holder 56 is not limited to the clamp 68, and, for example, a Fig. The means shown in Figure 27 are used. This sensor holder 69 is injection-molded in one piece with an anchoring section 70 on its side. The anchoring section 70 has a recess 70a with a circular arc cross-section, which is shaped such that it has a slightly smaller diameter than the outer diameter of the cable harness 66, and the cable harness 66 is snapped into the recess 70a. This makes it possible to attach the cable harness 66 in the recess 70a by elastically deforming the anchoring section 70 in a single operation, thereby improving the machinability during assembly of the bearing device.

[0124] Although the illustrated embodiment shows an active type wheel speed detection device comprising the magnetic encoder 63 and the wheel speed sensor 64, which includes magnetic locking elements such as Hall effect elements, it is possible to use a passive type wheel speed detection device comprising, for example, gears, a magnet and a ring-shaped coil, etc.

[0125] The present invention has been described with reference to preferred embodiments. It is clear that after reading and understanding the preceding detailed description, the person skilled in the art will think of variations and modifications. It is intended that the present invention be designed to include all such variations and modifications, provided they fall within the scope of the accompanying claims or their equivalents. Commercial application

[0126] The wheel bearing device of the present invention, which is connected with a wheel speed detection device, can be applied to a wheel bearing device of the construction of an inner ring rotation, into which any type of wheel speed detection device is installed. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a longitudinal section view of a first embodiment of a wheel bearing device of the present invention connected with a wheel speed detection device; Fig. 2 is a partially enlarged view of Fig. 1, which shows the locking section; Fig. 3 is a partially enlarged view of Fig. 2; Fig. Figure 4 is a side elevation view of Fig. 1; Fig. Figure 5 is a longitudinal section view of a second embodiment of a wheel bearing device of the present invention connected with a wheel speed detection device; Fig. Image 6 is a partially enlarged view of Fig. 5, which shows the locking section; Fig. Figure 7 is a side elevation view showing the wheel bearing assembly before the sensor holder is attached; Fig. Figure 8 is a side elevation view of Fig. 5; Fig. Figure 9 is a front elevation view, which is a variation of Fig. 7 shows the wheel bearing device before the sensor holder is attached; Fig. 10 is a front elevation view of Fig. 9, which shows the wheel bearing assembly after the sensor holder has been attached; Fig. 11(a) is a partially enlarged view showing a composite state of Fig. 10 shows, and Fig. 11(b) is a partially enlarged view, which is a modification of Fig. 11(a) shows; Fig. Figure 12 is a longitudinal section view of a third embodiment of a wheel bearing device of the present invention connected with a wheel speed detection device; Fig. Figure 13 is an explanatory view showing the construction of the sensor holder. Fig. 12 shows; Fig. Figure 14 is a longitudinal section view of a fourth embodiment of a wheel bearing device of the present invention connected with a wheel speed detection device; Fig. 15 is a partially enlarged view of Fig. 14; Fig. Figure 16 is a longitudinal section view of a fifth embodiment of a wheel bearing device of the present invention connected with a wheel speed detection device; Fig. 17 is a partially enlarged view of Fig. 16; Fig. Figure 18 is a longitudinal section view of a sixth embodiment of a wheel bearing device of the present invention connected with a wheel speed detection device; Fig. 19 is a partially enlarged view of Fig. 18, which shows the locking section; Fig. Figure 20 is an explanatory view showing the construction of the sensor holder. Fig. 19 shows; Fig. 21 is a side elevation view of Fig. 5; Fig. 22(a) is a longitudinal section view, or Fig. 22(b) a front elevation view of a cover; Fig. Figure 23 is a longitudinal section view of a seventh embodiment of a wheel bearing device of the present invention connected with a wheel speed detection device; Fig. 24 is a partially enlarged view of Fig. 23, which shows the locking section; Fig. 25 is a view from an arrow III-III; Fig. 26 is a partially sectioned view along a line VI-VI of Fig. 25; Fig. 27 is a partially cropped view of the modification of Fig. 26; Fig. Figure 28 is a longitudinal section view of a prior art wheel bearing device connected with a wheel speed detection device; Fig. 29 is a partially enlarged view of Fig. 28; and Fig. Figure 30 is a side elevation view of Fig. 28. DESCRIPTION OF REFERENCE MARKS 1.48 wheel hub 1a, 2a inner raceway surface 1b cylindrical section 1c, 24a Gearing 1d caulking section 2 inner ring 3, 49 inner element 4 Rolling element (ball) 5, 50 outer element 5a, outer running ring surface 5b Mounting flange 5c End surface of the outer element 6 Wheel mounting flange 6a Hub screw 6b Basic section 7 cage 8 external seal 9, 51 inner seal 10, 27, 37, 40, 43, 56, 69 sensor holder 11, 28, 38, 41, 44 Cover 11a, 28a, 44a Passport section 11b, 28b, 44b Flange section 11c, 28c, 38c, 44c Ground section 12, 29, 39, 42, 45 Stop section 13 Constant velocity joint 14, 36, 64 Wheel speed sensor 15, 58 ejection ring 15a, 58a, 59a cylindrical section 15b, 58b, 62b high-level section 16, 63 Magnetic encoders 17, 57 Sealing plate 18, 59, 62 core metal 19, 60 Sealing element 19a, 60a Side lip 19b Grease lip 19c Middle lip 20, 30, 41a Fastening section 20a, 30a notch 20b round opening 21, 66 Cable harness 22 outer joint element 23 Shoulder 24 shaft section 24b Bolt thread (external thread) 25 fastening nuts 26, 47 Drainage opening 31, 32, 33, 34, 35 Marking 36a, 64c integrated circuit 36b, 64b Conductor wire 42a, 45a, 59b, 62a Inner circumference 45b, 62c outer circumference 46 Passage opening 52 Inner joint ring 53 Cage 54 torque-transmitting balls 55 Mouth section 60b, 60c radial lip 61 Impulse ring 64a Magnetic locking element Section 65 on leading out 67 plugs 68 bracket 70 Anchorage section 70a recess 101 outer element 101a outer raceway surface 101b Mounting flange 102 inner element 103 balls 104 Wheel mounting flange 104a Hub bolt 105 wheel hub 105a, 106a inner raceway surface 105b cylindrical section 105c gearing 106 inner ring 107 Cage 108, 109 Seal 110 outer joint element 111 shaft section 112 first sealing plate 113 second sealing plate 113a cylindrical section 113b elevated section 114 magnetic encoders 115 Core metal 116 Sealing element 116a Side lip 116b, 116c radial lip 117 cylinders 117a Passport section 117b Flange section 118 Stop section 119 Sensor holders 120 wheel speed sensor 121 small gap 122 Cable harness 123 Drainage opening A forming thickness from the fixing surface of the holding section to the integrated circuit B Thickness of the integrated circuit C Distance between the integrated circuit and the center of the cable harness D radius of the cable harness Since the outer diameter of the outer element The outer diameter of the holding section Do inner diameter of the end of the outer element E Forming thickness from cable harness to holding section F Distance between the contact surface of the cover and the locking surface of the holding section G axially projecting extent of the holding section H Forming thickness from the outer diameter to the cable harness J Distance between the cable bundle and the conductor wire K Distance between the bent section of the conductor wire and the integrated circuit L radial width of the integrated circuit M Forming thickness from the integrated circuit to the inner circumference of the holding section N radial dimension of the holding section W Pressing area of ​​the press fitting tool KN axle stub t thickness of the cover α flat width of the end surface β Cover width γ Labyrinth seal θ angle of inclination

Claims

[1] Wheel bearing device connected with a wheel speed detection device, comprising: - an outer element (5, 50) which is provided on an outer circumference with a mounting flange (5b) for attachment to a suspension device of a vehicle and is also provided on its inner circumference with two rows of outer running ring surfaces (5a); - an inner element (3, 49) comprising a wheel hub (1, 48) and at least one inner ring (2), wherein the wheel hub (1, 48) is integrally formed at one end with a wheel mounting flange (6) and has a cylindrical section (1b) extending axially from the wheel mounting flange (6), wherein the inner ring (2) is press-fitted onto the cylindrical section (1b) of the wheel hub (1, 48) and the wheel hub (1, 48) and the inner ring (2) are provided on their outer circumference with two rows of inner raceway surfaces (1a, 2a) opposite the two rows of outer raceway surfaces (5a); - two rows of rolling elements (4) which are mounted in a rolling manner between the inner (1a, 2a) and the outer raceway surfaces (5a); - Seals (8, 9, 51) which are fitted in annular openings formed between the outer element (5, 50) and the inner element (3, 49); - a sensor holder (10, 27, 37, 40, 43, 56, 69) comprising an annular cover (11, 28, 38, 41, 44) that is press-fitted onto the outer circumference of an inner end section of the outer element (5, 50), and a resin-based retaining section (12, 29, 39, 42, 45) connected to the cover (11, 28, 38, 41, 44) and containing a wheel speed sensor (14, 36, 64); and - a pulse ring (61) arranged on the outer circumference of the inner ring (2) and having circumferential features that change alternately and at equal intervals, wherein the pulse ring (61) is arranged such that it faces the wheel speed sensor (14, 36, 64) across a predetermined axial gap, - wherein the cover (11, 28, 38, 41, 44) comprises a cylindrical fitting section (11a, 28a, 44a) suitable for press-fitting onto the inner end section of the outer element (5, 50), a flange section (11b, 28b, 44b) extending radially inwards from the fitting section (11a, 28a, 44a) and suitable for being brought into close contact with the end face of the outer element (5, 50), and a bottom section (11c, 28c, 38c, 44c) extending further radially inwards from the flange section (11b, 28b, 44b) towards the inner ring (2) and on the inner side of the inner ring (2), wherein a fastening section (20, 30, 41a) is attached to the bottom section (11c, 28c, 38c, 44c) of the cover (11, 28, 38, 41, 44) is formed such that it projects from the bottom section (11c, 28c, 38c, 44c) to the inside on a radially outer section of the bottom section (11c, 28c, 38c, 44c); - wherein the retaining section (12, 29, 39, 42, 45) is integrally connected to the fastening section (20, 30, 41a) of the bottom section (11c, 28c, 38c, 44c), wherein the retaining section (12, 29, 39, 42, 45) is arranged over a region extending beyond the outer circumference of the fastening section (20, 30, 41a) to the fitting section (11a, 28a, 44a); and - wherein the flange section (11b, 28b, 44b) is shaped such that it has a flat surface such that it forms a bearing width greater than 5 mm or more on the end face of the outer element (5, 50) or greater than 50% or more in relation to the flat width of the end face of the outer element (5, 50). [2] Wheel bearing device connected with a wheel speed detection device according to claim 1, wherein an inner seal (9, 51) of the seals comprises an annular sealing plate (17, 57) comprising a core metal (18, 59, 62) which is press-molded from a steel plate such that it has a substantially L-shaped cross-section and is suitable for fitting into the inner end of the outer element (5, 50), and a sealing element (19, 60) integrally connected with the core metal (18, 59, 62), and a centrifugal ring (15, 58) which is press-molded from a steel plate such that it has a substantially L-shaped cross-section and is suitable for fitting onto the outer circumference of the inner ring (2);and wherein a magnetic encoder (16, 63) is integrally connected to the inner surface of the centrifugal ring (15, 58), wherein the magnetic encoder (16, 63) consists of an elastomer mixed with a magnetic powder and is magnetized by north and south poles arranged alternately in a circumferential direction. [3] Wheel bearing device connected with a wheel speed detection device according to claim 1, wherein a cable harness (21, 66) extends tangentially to the cover (11, 28, 38, 41, 44) of the holding section (12, 29, 39, 42, 45). [4] Wheel bearing device connected with a wheel speed detection device according to one of claims 1 to 3, wherein the cover (11, 28, 38, 41, 44) is formed from a non-magnetic austenitic stainless steel sheet. [5] Wheel bearing device connected with a wheel speed detection device according to one of claims 2 to 4, wherein the centrifugal ring (15, 58) is formed from a ferromagnetic steel plate. [6] Wheel bearing device connected with a wheel speed detection device according to one of claims 1 to 5, wherein the holding section (12, 29, 39, 42, 45) is formed from a non-magnetic synthetic resin. [7] Wheel bearing device connected with a wheel speed detection device according to claim 6, wherein the holding section (12, 29, 39, 42, 45) is formed from polyphenylene sulfide. [8] Wheel bearing device connected with a wheel speed detection device according to one of claims 1 to 7, wherein the holding section (12, 29, 39, 42, 45) contains 10 to 45 wt.% of a fiber reinforcement material comprising glass fibers. [9] Wheel bearing device connected to a wheel speed detection device according to one of claims 1 to 8, wherein a marking (31, 32, 33, 34, 35) is formed at a predetermined position of the inner end of the outer element (5, 50) and another marking (31, 32, 33, 34, 35) is formed at a predetermined position of the sensor holder (10, 27, 37, 40, 43, 56, 69), and wherein the sensor holder (10, 27, 37, 40, 43, 56, 69) is attached to the outer element (5, 50) such that the markings (31, 32, 33, 34, 35) are aligned with each other. [10] Wheel bearing device connected with a wheel speed detection device according to claim 9, wherein the marking (31, 32, 33, 34, 35) of the outer element (5, 50) is formed by laser marking or painting. [11] Wheel bearing device connected with a wheel speed detection device according to claim 9 or 10, wherein the marking (31, 32, 33, 34, 35) of the sensor holder (10, 27, 37, 40, 43, 56, 69) is formed by painting or notching. [12] Wheel bearing device connected to a wheel speed detection device according to one of claims 1 to 11, wherein a cable harness (21, 66) connected to the wheel speed sensor (14, 36, 64) in order to send an output of the wheel speed sensor (14, 36, 64) to a controller is led out of the retaining section (12, 29, 39, 42, 45) of the sensor holder (10, 27, 37, 40, 43, 56, 69), and wherein the radial dimension of the retaining section (12, 29, 39, 42, 45) is limited to a range of 8.5 to 15.0 mm, and the extent of the axial projection of the retaining section (12, 29, 39, 42, 45) from the end face of the outer element (5, 50) is limited to a range of 8.5 to 20.0 mm. [13] Wheel bearing device connected with a wheel speed detection device according to claim 12, wherein the wheel speed sensor (14, 36, 64) comprises a magnetic locking element (64a) which changes its properties according to the flux direction of the magnetic flux, and an integrated circuit (36a, 64c) which is connected to a waveform circuit for rectifying the output waveform of the magnetic locking element (64a). [14] Wheel bearing device connected with a wheel speed detection device according to any one of claims 1 to 13, wherein the centrifugal ring (15, 58) is positioned and fastened such that the inner surface of the encoder (16, 63) is positioned in the same plane as the end surface of the inner ring (2) or at a position slightly retracted from it towards the inside of the bearing device, and wherein the outer surface of the retaining section (12, 29, 39, 42, 45) is arranged such that it does not project from the inner surface of the bottom section (11c, 28c, 38c, 44c) of the cover (11, 28, 38, 41, 44).

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