JP2017067102A - Bearing device for wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device for a wheel capable of preventing leakage of grease and intrusion of dust and the like even when the number of sheets of seal lips is reduced, and bearing pressure of the seal lips is lowered, while improving a capture rate of dust and the like by projections.SOLUTION: In a bearing device 1 for a wheel, an outer-side seal member 10 is composed of a seal ring 11 fitted to an inner periphery of an outer member 2, an inlet portion co of an annular space is formed at an outer side with respect to the seal ring 11, a number of ciliary projections 12 are disposed from the outer member 2 toward a hub ring 4 on the inlet portion co, and a number of ciliary projections 12 are disposed from the hub ring 4 toward the outer member 2.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a wheel bearing device. Specifically, the present invention relates to a wheel bearing device in which a large number of protrusions are provided around a seal member.

  2. Description of the Related Art Conventionally, a wheel bearing device that rotatably supports a wheel in a suspension device such as an automobile is known. In the wheel bearing device, the inner member is supported inside the outer member via the rolling elements. When the grease contained in the wheel bearing device is reduced or sand dust or the like (including rainwater or muddy water in addition to sand dust) enters the wheel bearing device, the rolling element is damaged and the bearing life is shortened. For this reason, the wheel bearing device is fitted with a pair of seal members at both ends of the annular space formed between the outer member and the inner member in order to prevent grease from leaking and prevent intrusion of dust and the like. doing.

  Incidentally, a wheel bearing device has been proposed in which a large number of protrusions are provided around the seal member. In such a wheel bearing device, since a large number of projections capture dust and the like, damage to the seal member can be prevented. As a result, leakage of grease and intrusion of dust and the like can be prevented, and the bearing life can be improved. For example, as described in Patent Document 1.

  The wheel bearing device described in Patent Literature 1 includes an outer member, an inner member, a rolling element interposed between the outer member and the inner member, and between the outer member and the inner member. And a pair of seal members attached to both ends of the annular space formed in the. One seal member is constituted by a seal ring fitted to the inner periphery of the outer member. And the front-end | tip of the seal lip formed in the seal ring is in the state which contacted the inner member. In addition, the wheel bearing device described in Patent Document 1 includes a large number of protrusions around the seal member. And the front-end | tip of a protrusion is in the state which adjoined to the inner member.

  The wheel bearing device described in Patent Document 1 has a base portion that is bonded and fixed to an outer member, and a large number of protrusions are planted on the base portion. However, with such a configuration, it is difficult to increase the number of protrusions, and there is a problem that the capturing rate of dust and the like by the protrusions cannot be improved. Further, in the conventional wheel bearing device including such a wheel bearing device, in order to reduce the frictional resistance, it is necessary to reduce the number of seal lips or reduce the surface pressure of the seal lip. However, if the number of seal lips is reduced or the surface pressure of the seal lips is lowered, there is a problem that the sealing performance is lowered. That is, there has been a problem that the life of the bearing is reduced due to leakage of grease or intrusion of dust or the like.

JP 2013-72463 A

  The present invention has been made in view of the above situation, and even if the number of seal lips is reduced or the surface pressure of the seal lip is lowered while improving the capture rate of dust and the like by the protrusions, An object of the present invention is to provide a wheel bearing device that can prevent intrusion of leakage or dust.

  That is, the present invention includes an outer member integrally having a vehicle body mounting flange on the outer periphery, a double row outer rolling surface formed integrally on the inner periphery, and a wheel mounting flange for mounting a wheel on one end. A hub wheel integrally formed and having a small-diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small-diameter step portion of the hub wheel, the outer circumferential rolling surface of the double row on the outer periphery An inner member in which a double-row inner rolling surface facing the inner member is formed, and a double-row rolling element accommodated so as to roll between the outer member and the inner member. A wheel bearing device comprising: a pair of seal members attached to both ends of an annular space formed between the outer member and the inner member; and an outer seal of the pair of seal members The member is a seal ring fitted to the inner periphery of the outer member. An inlet portion of the annular space is formed outside the seal ring, and a plurality of cilia-like projections are provided on the inlet portion from the outer member toward the hub ring, and the hub A plurality of cilia-like protrusions are provided from the ring toward the outer member.

  In the present invention, the protrusions on the outer member side and the protrusions on the hub wheel side constituting the inner member are alternately arranged.

  According to the present invention, the protrusions on the outer member side are alternately provided in a short and long manner, and the protrusions on the hub wheel side constituting the inner member are also provided in a short and long manner so that the long protrusion and the short protrusion are abutted. It is arranged as follows.

  In the present invention, the density of the protrusions on the outer member side and the protrusions on the hub wheel side constituting the inner member is made dense on the radially outer side of the inlet portion.

  In the present invention, the protrusion on the outer member side and the protrusion on the hub wheel side constituting the inner member are subjected to water repellent finishing.

  In the present invention, the grease is held by the protrusion on the outer member side and the protrusion on the hub wheel side constituting the inner member.

  In the present invention, the protrusion on the outer member side is provided to be inclined to the front side in the main rotation direction with respect to the rotation axis direction of the inner member.

  As effects of the present invention, the following effects can be obtained.

  That is, according to the present invention, in the wheel bearing device, the inlet portion of the annular space is formed outside the seal ring. A large number of cilia-like protrusions are provided from the outer member toward the hub ring, and a plurality of cilia-like protrusions are provided from the hub ring toward the outer member. Thereby, since a protrusion increases, the capture rate of dust etc. by a protrusion can be improved. In addition, since a large number of projections capture dust and the like to prevent damage to the seal ring, it is possible to prevent leakage of grease and entry of dust and the like.

  According to the present invention, in the wheel bearing device, the protrusions on the outer member side and the protrusions on the hub wheel side constituting the inner member are alternately arranged. This reliably captures dust and prevents damage to the seal ring, thus further preventing leakage of grease and intrusion of dust and the like.

  According to the present invention, in the wheel bearing device, the protrusions on the outer member side are alternately provided in the length direction, and the protrusions on the hub wheel side constituting the inner member are also provided in the length direction. And it arrange | positions so that a long protrusion and a short protrusion may be faced | matched. This reliably captures dust and prevents damage to the seal ring, thus further preventing leakage of grease and intrusion of dust and the like.

  According to the present invention, in the wheel bearing device, the density of the protrusions on the outer member side and the protrusions on the hub wheel side constituting the inner member is dense on the radially outer side of the inlet portion. As a result, rainwater, muddy water, or the like that has entered the inlet portion permeates toward the outside of the inlet portion (referred to as a capillary phenomenon), so that intrusion of rainwater, muddy water, or the like can be further suppressed.

  According to the present invention, in the wheel bearing device, the protrusion on the outer member side and the protrusion on the hub wheel side constituting the inner member are subjected to water repellent finishing. Thereby, since rain water, muddy water, etc. which entered the entrance part are not held by a projection, invasion of rain water, muddy water, etc. can be controlled further.

  According to the present invention, the wheel bearing device holds the grease by the protrusion on the outer member side and the protrusion on the hub wheel side constituting the inner member. Thereby, since rain water, muddy water, etc. which entered the entrance part are not held by a projection, invasion of rain water, muddy water, etc. can be controlled further.

  According to the present invention, the wheel bearing device is provided with the protrusion on the outer member side inclined toward the front side in the main rotation direction with respect to the rotation axis direction of the inner member. Thereby, since rain water, muddy water, etc. which entered the entrance part are scraped out by a projection, invasion of rain water, muddy water, etc. can be controlled further.

The perspective view which shows the whole structure in 1st embodiment of the wheel bearing apparatus which concerns on this invention. Sectional drawing which shows the whole structure in 1st embodiment of the wheel bearing apparatus which concerns on this invention (A arrow line view in FIG. 1). The expanded sectional view which shows the partial structure in 1st embodiment of the wheel bearing apparatus which concerns on this invention. The expanded sectional view which shows the partial structure in 1st embodiment of the wheel bearing apparatus which concerns on this invention. The expanded sectional view which shows the seal member in 1st embodiment of the wheel bearing apparatus which concerns on this invention. The expanded sectional view which shows the seal member in 2nd embodiment of the wheel bearing apparatus which concerns on this invention. The expanded sectional view which shows the seal member in 3rd embodiment of the wheel bearing apparatus which concerns on this invention. The expanded sectional view which shows the sealing member in 4th embodiment of the wheel bearing apparatus which concerns on this invention. The expanded sectional view which shows the sealing member in 5th embodiment of the wheel bearing apparatus which concerns on this invention. The expanded sectional view which shows the sealing member in 6th embodiment of the wheel bearing apparatus which concerns on this invention. The expanded sectional view which shows the sealing member in other embodiment of the wheel bearing apparatus which concerns on this invention. The expanded sectional view which shows the sealing member in other embodiment of the wheel bearing apparatus which concerns on this invention. The expanded sectional view which shows the sealing member in other embodiment of the wheel bearing apparatus which concerns on this invention.

  Below, the wheel bearing apparatus 1 which is 1st embodiment of the wheel bearing apparatus which concerns on this invention using FIGS. 1-4 is demonstrated.

  The wheel bearing device 1 supports a wheel rotatably in a suspension device such as an automobile. The wheel bearing device 1 includes an outer member 2, an inner member 3 (hub wheel 4 and inner ring 5), a rolling element 6, a seal member 7 (hereinafter referred to as “one-side seal member 7”), and a seal member 10 (hereinafter “ (Referred to as “other-side seal member 10”). In addition, "one side" represents the vehicle body side of the wheel bearing device 1, that is, the inner side. The “other side” represents the wheel side of the wheel bearing device 1, that is, the outer side.

  The outer member 2 supports the inner member 3 (hub wheel 4 and inner ring 5). The outer member 2 is made of a medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C formed in a substantially cylindrical shape. A one-side opening 2 a into which the one-side seal member 7 can be fitted is formed at one end of the outer member 2. At the other side end of the outer member 2, an other side opening 2b into which the other side sealing member 10 can be fitted is formed. On the inner peripheral surface of the outer member 2, an outer rolling surface 2c and an outer rolling surface 2d are formed in an annular shape so as to be parallel to each other. However, the outer raceway 2d has a larger pitch circle diameter than the outer raceway 2c. The outer rolling surface 2c and the outer rolling surface 2d are subjected to induction hardening, and are hardened so that the surface hardness is in the range of 58 to 64 HRC. Note that a vehicle body attachment flange 2e for being attached to the knuckle of the suspension device is integrally formed on the outer peripheral surface of the outer member 2.

  The inward member 3 rotatably supports a wheel (not shown). The inner member 3 includes a hub ring 4 and an inner ring 5.

  The hub wheel 4 is made of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C formed in a bottomed cylindrical shape. A small diameter step 4 a is formed at one end of the hub wheel 4. An inner ring 5 is press-fitted into the small diameter step 4a. A wheel mounting flange 4 b is integrally formed at the other end of the hub wheel 4. Hub bolts 4d are provided on the wheel mounting flange 4b at circumferentially equidistant positions. Further, an inner rolling surface 4 c is formed in an annular shape on the outer peripheral surface of the hub wheel 4. The hub wheel 4 is induction-hardened from the small-diameter step portion 4a to the inner rolling surface 4c, and is hardened so that the surface hardness is in the range of 58 to 64 HRC. Thereby, the hub wheel 4 has sufficient mechanical strength and durability against the rotational bending load applied to the wheel mounting flange 4b. The inner rolling surface 4 c faces the outer rolling surface 2 d of the outer member 2.

  The inner ring 5 is made of a high carbon chrome bearing steel such as SUJ2 formed in a substantially cylindrical shape. On the outer peripheral surface of the inner ring 5, an inner rolling surface 5a is formed in an annular shape. That is, the inner ring 5 is fitted into the small-diameter step portion 4a of the hub wheel 4, and the inner raceway surface 5a is configured on the outer periphery of the small-diameter step portion 4a. The inner ring 5 is subjected to so-called quenching and is cured so as to be in the range of 58 to 64 HRC up to the core. Thereby, the inner ring 5 has sufficient mechanical strength and durability against the rotational bending load applied to the wheel mounting flange 4b. The inner rolling surface 5 a faces the outer rolling surface 2 c of the outer member 2.

  The rolling element 6 is interposed between the outer member 2 and the inner member 3 (hub wheel 4 and inner ring 5). The rolling element 6 has one side ball row 6a and another side ball row 6b. The one side ball row 6a and the other side ball row 6b are made of high carbon chrome bearing steel such as SUJ2. The one-side ball row 6a and the other-side ball row 6b are subjected to so-called quenching and are cured so as to be in the range of 58 to 64 HRC up to the core portion. In the one-side ball row 6a, a plurality of balls as rolling elements are held in an annular shape by a cage. Also in the other side ball row 6b, a plurality of balls as rolling elements are held in a ring shape by a cage. However, the other side ball row 6b has a larger pitch circle diameter than the one side ball row 6a. The one-side ball row 6a is accommodated so as to be freely rollable between an inner rolling surface 5a formed on the inner ring 5 and an outer rolling surface 2c of the outer member 2 facing the inner rolling surface 5a. The other-side ball row 6b is accommodated so as to be freely rollable between an inner rolling surface 4c formed on the hub wheel 4 and an outer rolling surface 2d of the outer member 2 facing the inner rolling surface 4c. In this way, the one-side ball row 6a and the other-side ball row 6b constitute a double-row angular ball bearing with the outer member 2 and the inner member 3 (hub wheel 4 and inner ring 5). In addition, although the wheel bearing apparatus 1 comprises a double row angular contact ball bearing, it is not limited to this. For example, a double row tapered roller bearing or the like may be configured. Further, the wheel bearing device 1 is a third-generation wheel bearing device in which the inner raceway surface 4c of the one-side ball row 6a is directly formed on the outer periphery of the hub wheel 4, but the present invention is not limited to this. The second generation structure in which the pair of inner rings 5 are press-fitted and fixed to the hub ring 4 or the first ring constituted by the outer ring that is the outer member 2 without the hub ring 4 and the inner ring 5 that is the inner member. It may be a generation structure.

  The one-side seal member 7 is attached to an opening of an annular space formed between the outer member 2 and the inner member 3. The one-side seal member 7 includes an annular seal ring 8 and an annular slinger 9.

  The seal ring 8 is fitted to the inner periphery of the outer member 2 and is configured integrally with the outer member 2. The seal ring 8 includes a cored bar 81 and a seal rubber 82 that is an elastic member.

  The cored bar 81 is a ferritic stainless steel plate (JIS standard SUS430 or the like), an austenitic stainless steel plate (JIS standard SUS304 or the like), or a rust-proof cold rolled steel plate (JIS standard SPCC system or the like). It consists of The core metal 81 is formed in a substantially L shape in an axial cross-sectional view by bending an annular steel plate by press working. Thereby, the cored bar 81 is formed with a cylindrical fitting part 81a and a disk-like side plate part 81b extending from one end thereof toward the inner member 3 (inner ring 5). The fitting portion 81a and the side plate portion 81b intersect each other substantially perpendicularly, and the fitting portion 81a faces a fitting portion 9a of a slinger 9 described later. The side plate portion 81b faces a side plate portion 9b of the slinger 9 described later. A seal rubber 82, which is an elastic member, is vulcanized and bonded to the fitting portion 81a and the side plate portion 81b.

  Seal rubber 82 is NBR (acrylonitrile-butadiene rubber), HNBR (hydrogenated acrylonitrile-butadiene rubber) excellent in heat resistance, EPDM (ethylene propylene rubber), ACM (polyacrylic rubber) excellent in heat resistance and chemical resistance, It is made of synthetic rubber such as FKM (fluoro rubber) or silicon rubber. The seal rubber 82 is formed with a radial lip 82a, an inner axial lip 82b, and an outer axial lip 82c which are seal lips.

  The slinger 9 is fitted to the outer periphery of the inner member 3 (the outer periphery of the inner ring 5) and is configured integrally with the inner member 3.

  Slinger 9 is a ferritic stainless steel sheet (JIS standard SUS430 series, etc.), austenitic stainless steel sheet (JIS standard SUS304 series, etc.), or a rust-proof cold rolled steel sheet (JIS standard SPCC system, etc.). It is configured. The slinger 9 is formed by bending an annular steel plate by pressing, and is formed in an approximately L shape in an axial sectional view. Thereby, the slinger 9 is formed with a cylindrical fitting portion 9a and a disc-shaped side plate portion 9b extending from the end portion toward the outer member 2. The fitting portion 9a and the side plate portion 9b intersect each other vertically, and the fitting portion 9a faces the fitting portion 81a of the cored bar 81 described above. Further, the side plate portion 9b faces the side plate portion 81b of the cored bar 81 described above. The side plate portion 9b is provided with a magnetic encoder 9c.

  The one-side seal member 7 is disposed so that the seal ring 8 and the slinger 9 face each other. At this time, the radial lip 82a contacts the fitting portion 9a of the slinger 9 through the oil film. Further, the axial lip 82b contacts the side plate portion 9b of the slinger 9 through the oil film. The outer axial lip 82c also contacts the side plate portion 9b of the slinger 9 through the oil film. In this way, the one-side seal member 7 constitutes a so-called pack seal and prevents leakage of grease and intrusion of dust and the like.

  The other side sealing member 10 is attached to the opening C of the annular space formed between the outer member 2 and the inner member 3. The other-side seal member 10 includes an annular seal ring 11.

  The other-side seal member 10 is integrally formed with the outer member 2 by being fitted to the inner periphery of the outer member 2. The seal ring 11 includes a metal core 111 and a seal rubber 112 that is an elastic member.

  The core metal 111 is a ferritic stainless steel plate (JIS standard SUS430 series, etc.), an austenitic stainless steel sheet (JIS standard SUS304 series, etc.), or a rust-proof cold rolled steel plate (JIS standard SPCC system, etc.). It consists of The core metal 111 is formed in a substantially C shape in an axial sectional view by bending an annular steel plate by press working. Thereby, the metal core 111 is formed with a cylindrical fitting portion 111a and a disk-shaped side plate portion 111b extending from one end thereof toward the inner member 3 (hub wheel 4). The fitting part 111 a and the side plate part 111 b intersect with each other while being curved, and the fitting part 111 a faces the shaft surface part 4 g of the hub wheel 4. The side plate portion 111b faces the curved surface portion 4f and the side surface portion 4e of the hub wheel 4 (refers to the end surface of the wheel mounting flange 4b). Seal rubber 112, which is an elastic member, is vulcanized and bonded to the fitting portion 111a and the side plate portion 111b.

  Seal rubber 112 is NBR (acrylonitrile-butadiene rubber), HNBR (hydrogenated acrylonitrile-butadiene rubber) excellent in heat resistance, EPDM (ethylene propylene rubber), ACM (polyacrylic rubber) excellent in heat resistance and chemical resistance, It is made of synthetic rubber such as FKM (fluoro rubber) or silicon rubber. The seal rubber 112 is formed with a radial lip 112a, an inner axial lip 112b, and an outer axial lip 112c which are seal lips.

  The other-side seal member 10 is disposed so that the seal ring 11 and the hub wheel 4 face each other. At this time, the radial lip 112a contacts the shaft surface portion 4g of the hub wheel 4 through the oil film. Further, the axial lip 112b contacts the curved surface portion 4f of the hub wheel 4 through an oil film. The outer axial lip 112c also contacts the side surface portion 4e of the hub wheel 4 through the oil film. In this way, the other-side seal member 10 prevents grease from leaking and prevents intrusion of dust and the like.

  Next, the wheel bearing device 1 according to the first embodiment will be described in detail with reference to FIG. FIG. 5A is an enlarged view of the region R. FIG.

  The wheel bearing device 1 forms an annular opening C between the outer member 2 and the inner member 3 (hub wheel 4). The opening C is a passage L1 that is a clearance between the outer member 2 and the side surface portion 4e of the hub wheel 4, a passage L2 that is a clearance between the other side sealing member 10 and the curved surface portion 4f of the hub wheel 4, and the other side sealing member. 10 and a passage L3 that is a gap between the shaft surface portion 4g of the hub wheel 4 and the like. That is, the wheel bearing device 1 forms an arcuate opening C composed of the passage L1, the passage L2, and the passage L3 in a space connecting the outside and the inside.

  Thus, as for the wheel bearing apparatus 1, the opening part C is suppressing the penetration | invasion of dust etc. An inner axial lip 112b and an outer axial lip 112c are disposed in the passage L2, and a radial lip 112a is disposed in the passage L3. For this reason, the function of each of the lips 112a, 112b, and 112c that prevents the leakage of grease and the entry of dust and the like has a synergistic advantage by the function of the opening C that suppresses the entry of dust and the like.

  In addition, the wheel bearing device 1 includes a large number of cilia-like protrusions 12 at the inlet portion co located outside the seal ring 11. The protrusion 12 captures dust and the like between adjacent protrusions 12. In addition, the protrusion 12 is arrange | positioned at the channel | path L1 (inlet part co).

  The protrusion 12 is made of a synthetic resin such as polyethylene or nylon (polyamide type). The protrusion 12 is one in which cilia formed in a straight line are planted one by one. However, a plurality of cilia formed in a straight line may be bundled and planted for each bundle.

  The protrusion 12 is provided from the outer member 2 toward the hub wheel 4 constituting the inner member 3. More specifically, the protrusion 12 is planted in a base portion that is bonded and fixed to the end face of the outer member 2, and is provided so as to cross the passage L <b> 1 toward the side surface portion 4 e of the hub wheel 4. And the front-end | tip of this protrusion 12 is in the state which adjoined to the side part 4e of the hub ring 4. FIG. Further, the projection 12 is provided from the hub wheel 4 constituting the inner member 3 toward the outer member 2. More specifically, the protrusion 12 is planted in a base portion that is bonded and fixed to the side surface portion 4 e of the hub wheel 4, and is provided so as to cross the passage L <b> 1 toward the end surface of the outer member 2. And the front-end | tip of this protrusion 12 is in the state which adjoined the end surface of the outward member 2. FIG. In the present embodiment, the protrusions 12 on the outer member 2 side and the protrusions 12 on the hub wheel 4 side constituting the inner member 3 are alternately arranged. This is to improve the capture rate of dust and the like.

  As described above, in the wheel bearing device 1, a large number of protrusions 12 capture dust and the like to prevent damage to the seal ring 11 (radial lip 112 a, inner axial lip 112 b, outer axial lip 112 c). In other words, grease leakage and dust intrusion are prevented. In the wheel bearing device 1, the protrusion 12 is disposed in the passage L <b> 1 corresponding to the entrance of the opening C. For this reason, the function of the opening C that suppresses intrusion of dust and the like by the function of the projection 12 that captures dust and the like, and the lips 112a, 112b, and 112c that prevent leakage of grease and invasion of dust and the like. And synergistically superior effects.

  As described above, in the wheel bearing device 1 according to the first embodiment, the inlet portion co of the annular space (opening portion C) is formed outside the seal ring 11. A large number of cilia-like projections 12 are provided at the inlet portion co from the outer member 2 toward the hub ring 4, and a large number of cilia-like projections 12 are provided from the hub ring 4 toward the outer member 2. Is provided. Thereby, since the protrusions 12 increase, the capture rate of dust etc. by the protrusions 12 can be improved. In addition, since a large number of projections 12 capture dust and the like and prevent damage to the seal ring 11 (radial lip 112a, inner axial lip 112b, and outer axial lip 112c), leakage of grease and entry of dust and the like can be prevented.

  Further, in the present embodiment, the protrusions 12 on the outer member 2 side and the protrusions 12 on the hub wheel 4 side constituting the inner member 3 are alternately arranged. This reliably captures dust and the like and prevents damage to the seal ring 11 (radial lip 112a, inner axial lip 112b, and outer axial lip 112c), thus further preventing leakage of grease and entry of dust and the like.

  Next, the wheel bearing device 1 according to the second embodiment will be described in detail with reference to FIG. FIG. 6A is an enlarged view of the region R.

  Also in the wheel bearing device 1 according to the second embodiment, an annular opening C is formed between the outer member 2 and the inner member 3 (hub wheel 4). In addition, a large number of cilia-like protrusions 12 are provided at the inlet portion co located outside the seal ring 11. The protrusion 12 is disposed in the passage L1 (inlet portion co).

  The protrusion 12 is provided from the outer member 2 toward the hub wheel 4 constituting the inner member 3. More specifically, the protrusion 12 is planted in a base portion that is bonded and fixed to the end face of the outer member 2, and is provided so as to cross the passage L <b> 1 toward the side surface portion 4 e of the hub wheel 4. And the front-end | tip of this protrusion 12 is in the state which adjoined to the side part 4e of the hub ring 4. FIG. Further, the projection 12 is provided from the hub wheel 4 constituting the inner member 3 toward the outer member 2. More specifically, the protrusion 12 is planted in a base portion that is bonded and fixed to the side surface portion 4 e of the hub wheel 4, and is provided so as to cross the passage L <b> 1 toward the end surface of the outer member 2. And the front-end | tip of this protrusion 12 is in the state which adjoined the end surface of the outward member 2. FIG. In the present embodiment, the protrusions 12 on the outer member 2 side are alternately provided in the short and long directions, and the protrusions 12 on the hub wheel 4 side constituting the inner member 3 are also alternately provided in the long and short sides. And it arrange | positions so that the long protrusion 12 and the short protrusion 12 may be faced | matched. This is to improve the capture rate of dust and the like.

  As described above, in the wheel bearing device 1, a large number of protrusions 12 capture dust and the like to prevent damage to the seal ring 11 (radial lip 112 a, inner axial lip 112 b, outer axial lip 112 c). In other words, grease leakage and dust intrusion are prevented. In the wheel bearing device 1, the protrusion 12 is disposed in the passage L <b> 1 corresponding to the entrance of the opening C. For this reason, the function of the opening C that suppresses intrusion of dust and the like by the function of the projection 12 that captures dust and the like, and the lips 112a, 112b, and 112c that prevent leakage of grease and invasion of dust and the like. And synergistically superior effects.

  As described above, in the wheel bearing device 1 according to the second embodiment, the inlet portion co of the annular space (opening portion C) is formed outside the seal ring 11. A large number of cilia-like projections 12 are provided at the inlet portion co from the outer member 2 toward the hub ring 4, and a large number of cilia-like projections 12 are provided from the hub ring 4 toward the outer member 2. Is provided. Thereby, since the protrusions 12 increase, the capture rate of dust etc. by the protrusions 12 can be improved. In addition, since a large number of projections 12 capture dust and the like and prevent damage to the seal ring 11 (radial lip 112a, inner axial lip 112b, and outer axial lip 112c), leakage of grease and entry of dust and the like can be prevented.

  Further, in the present embodiment, the protrusions 12 on the outer member 2 side are alternately provided in the short and long directions, and the protrusions 12 on the hub wheel 4 side constituting the inner member 3 are also alternately provided in the long and short sides. And it arrange | positions so that the long protrusion 12 and the short protrusion 12 may be faced | matched. This reliably captures dust and the like and prevents damage to the seal ring 11 (radial lip 112a, inner axial lip 112b, and outer axial lip 112c), thus further preventing leakage of grease and entry of dust and the like.

  Next, the wheel bearing device 1 according to the third embodiment will be described in detail with reference to FIG. FIG. 7A is an enlarged view of the region R. FIG.

  The wheel bearing device 1 according to the third embodiment is obtained by adding a technical idea to the wheel bearing device 1 according to the first embodiment. However, a technical idea may be added to the wheel bearing device 1 according to the second embodiment.

  In the present embodiment, the protrusions 12 on the outer member 2 side and the protrusions 12 on the hub wheel 4 side constituting the inner member 3 are alternately arranged. Further, the density of the protrusions 12 on the outer member 2 side and the protrusions 12 on the hub wheel 4 side constituting the inner member 3 is made dense on the radially outer side of the inlet portion co. That is, the protrusions 12 are dense on the radially outer side of the passage L1 and rough on the radially inner side of the passage L1.

  As described above, in the present embodiment, the density of the protrusions 12 on the outer member 2 side and the protrusions 12 on the hub wheel 4 side constituting the inner member 3 is dense on the radially outer side of the inlet portion co. As a result, rainwater, muddy water, and the like that have entered the inlet portion co penetrate into the outside of the inlet portion co (referred to as a capillary phenomenon), and therefore, intrusion of rainwater, muddy water, and the like can be further suppressed.

  Next, the wheel bearing device 1 which is 4th embodiment is demonstrated in detail using FIG. FIG. 8A is an enlarged view of the region R. FIG.

  The wheel bearing device 1 according to the fourth embodiment is obtained by adding a technical idea to the wheel bearing device 1 according to the first embodiment. However, a technical idea may be added to the wheel bearing device 1 according to the second embodiment or the third embodiment.

  In the present embodiment, the protrusions 12 on the outer member 2 side and the protrusions 12 on the hub wheel 4 side constituting the inner member 3 are alternately arranged. Further, a water repellent finish P is applied to the protrusion 12 on the outer member 2 side and the protrusion 12 on the hub wheel 4 side constituting the inner member 3. That is, the surface of the protrusion 12 is processed to be hydrophobic.

  Thus, in the present embodiment, the water repellent finish P is applied to the protrusions 12 on the outer member 2 side and the protrusions 12 on the hub wheel 4 side constituting the inner member 3. Thereby, since the rainwater, muddy water, etc. which entered the entrance part co are not hold | maintained by the protrusion 12, intrusion of rainwater, muddy water, etc. can be suppressed further.

  Next, the wheel bearing apparatus 1 which is 5th embodiment is demonstrated in detail using FIG. FIG. 9A is an enlarged view of the region R. FIG.

  The wheel bearing device 1 according to the fifth embodiment is obtained by adding a technical idea to the wheel bearing device 1 according to the first embodiment. However, a technical idea may be added to the wheel bearing device 1 according to the second to fourth embodiments.

  In the present embodiment, the protrusions 12 on the outer member 2 side and the protrusions 12 on the hub wheel 4 side constituting the inner member 3 are alternately arranged. Further, the grease G is held by the protrusion 12 on the outer member 2 side and the protrusion 12 on the hub wheel 4 side constituting the inner member 3. That is, the grease G is held in a state of being attached to the protrusion 12.

  As described above, in this embodiment, the grease G is held by the protrusion 12 on the outer member 2 side and the protrusion 12 on the hub wheel 4 side constituting the inner member 3. Thereby, since the rainwater, muddy water, etc. which entered the entrance part co are not hold | maintained by the protrusion 12, intrusion of rainwater, muddy water, etc. can be suppressed further.

  Next, the wheel bearing device 1 which is 6th embodiment is demonstrated in detail using FIG. FIG. 10A is an enlarged view of the region R. FIG. Moreover, (B) of FIG. 10 is a B arrow view.

  The wheel bearing device 1 according to the sixth embodiment is obtained by adding technical ideas to the wheel bearing device 1 according to the first embodiment. However, a technical idea may be added to the wheel bearing device 1 according to the second to fifth embodiments.

  In the present embodiment, the protrusions 12 on the outer member 2 side and the protrusions 12 on the hub wheel 4 side constituting the inner member 3 are alternately arranged. Further, the protrusion 12 on the outer member 2 side is provided to be inclined to the front side in the main rotation direction D with respect to the rotation axis direction C of the inner member 3. That is, the protrusion 12 is provided such that the tip end side is inclined in the main rotation direction D side.

  Thus, in the present embodiment, the protrusion 12 on the outer member 2 side is provided so as to be inclined to the front side in the main rotation direction D with respect to the rotation axis direction C of the inner member 3. Thereby, since rain water, muddy water, etc. which entered the entrance part co are scraped out by the projection 12, the penetration | invasion of rain water, muddy water, etc. can be suppressed further.

  Next, the wheel bearing device 1 which is other embodiment is demonstrated in detail using FIGS. 11-13.

  In FIG. 11A, the inner axial lip 112 b is not in contact with the curved surface portion 4 f of the hub wheel 4. Even in such a configuration, a large number of protrusions 12 capture dust and the like and prevent damage to the seal ring 11 (radial lip 112a, inner axial lip 112b, outer axial lip 112c). Intrusion can be prevented.

  In FIG. 11B, a radial lip 112a and one axial lip 112d are provided. Even in such a configuration, a large number of protrusions 12 capture dust and the like to prevent the seal ring 11 (radial lip 112a and axial lip 112d) from being damaged, so that leakage of grease and entry of dust and the like can be prevented.

  In FIG. 12A, the fitting portion 111 a of the core metal 111 is folded back to sandwich the end portion of the outer member 2. A large number of cilia-like protrusions 12 are provided from the seal ring 11 toward the hub ring 4 constituting the inner member 3, and a large number of the hub ring 4 constituting the inner member 3 is directed toward the seal ring 11. Cilia-like projections 12 are provided. Even in such a configuration, a large number of protrusions 12 capture dust and the like and prevent damage to the seal ring 11 (radial lip 112a, inner axial lip 112b, outer axial lip 112c). Intrusion can be prevented.

  12B has a slinger 13 that faces the seal ring 11, and the radial lip 112a, the inner axial lip 112b, and the outer axial lip 112c are in contact with the slinger 13. FIG. A large number of cilia-like protrusions 12 are provided from the outer member 2 toward the slinger 13, and a plurality of cilia-like protrusions 12 are provided from the slinger 13 toward the outer member 2. Even in such a configuration, a large number of protrusions 12 capture dust and the like and prevent damage to the seal ring 11 (radial lip 112a, inner axial lip 112b, outer axial lip 112c). Intrusion can be prevented.

  In FIG. 13A, the end portion of the outer member 2 is sandwiched between the fitting portions 111 a of the core metal 111. Further, the side plate portion 111b is not formed on the cored bar 111, and neither a radial lip nor an axial lip is provided. A large number of cilia-like protrusions 12 are provided from the seal ring 11 toward the hub ring 4 constituting the inner member 3, and a large number of the hub ring 4 constituting the inner member 3 is directed toward the seal ring 11. Cilia-like projections 12 are provided. Even in such a configuration, since a large number of projections 12 capture dust and the like, entry of dust and the like can be prevented.

  In FIG. 13B, only the slinger 13 is present, and the radial lip and the axial lip are not provided. A large number of cilia-like protrusions 12 are provided from the outer member 2 toward the slinger 13, and a plurality of cilia-like protrusions 12 are provided from the slinger 13 toward the outer member 2. Even in such a configuration, a large number of protrusions 12 can reliably capture dust and the like, and thus can prevent entry of dust and the like.

DESCRIPTION OF SYMBOLS 1 Wheel bearing apparatus 2 Outer member 3 Inner member 4 Hub ring 5 Inner ring 6 Rolling element 7 One side seal member 8 Seal ring 9 Slinger 10 Other side seal member (seal member)
11 Seal ring 12 Projection C Opening portion Co Inlet portion L1 passage L2 passage L3 passage

Claims (7)

An outer member integrally having a vehicle body mounting flange on the outer periphery, and a double row outer rolling surface formed integrally on the inner periphery;
From a hub wheel integrally having a wheel mounting flange for mounting a wheel at one end portion and having a small-diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small-diameter step portion of the hub ring An inner member in which a double row inner rolling surface facing the outer rolling surface of the double row is formed on the outer periphery,
A double row rolling element housed in a freely rolling manner between the rolling surfaces of the outer member and the inner member;
In a wheel bearing device comprising a pair of seal members attached to both ends of an annular space formed between the outer member and the inner member,
The outer seal member of the pair of seal members is formed of a seal ring fitted to the inner periphery of the outer member, and an inlet portion of the annular space is formed outside the seal ring,
A wheel provided with a plurality of cilia-like projections from the outer member toward the hub ring and a plurality of cilia-like projections from the hub ring toward the outer member at the inlet portion. Bearing device.   The wheel bearing device according to claim 1, wherein the protrusions on the outer member side and the protrusions on the hub wheel side constituting the inner member are alternately arranged.   The protrusions on the outer member side are provided alternately in length and the protrusions on the hub wheel side constituting the inner member are also provided alternately in length and arranged so that the long protrusion and the short protrusion are abutted. The wheel bearing device according to claim 1.   4. The density of the protrusions on the outer member side and the protrusions on the hub wheel side constituting the inner member is dense on the radially outer side of the inlet portion. 5. The wheel bearing apparatus described in 1.   The wheel bearing device according to any one of claims 1 to 4, wherein a water repellent finish is applied to the protrusion on the outer member side and the protrusion on the hub wheel side constituting the inner member. .   The wheel bearing device according to any one of claims 1 to 5, wherein the grease is held by the protrusion on the outer member side and the protrusion on the hub wheel side constituting the inner member.   The wheel bearing device according to any one of claims 1 to 6, wherein the protrusion on the outer member side is provided to be inclined to the front side in the main rotation direction with respect to the rotation axis direction of the inner member.

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