JP5317168B2 - Wheel bearing device - Google Patents

Description

  The present invention relates to a wheel bearing device for rotatably supporting a wheel of an automobile or the like with respect to a suspension device, and more specifically, there is no pilot portion for fitting with a knuckle on an outer periphery of an outer member, and the knuckles are in a butted state. The present invention relates to a wheel bearing device on the driven wheel side to which a vehicle body mounting flange is joined.

  Wheel bearing devices that support the wheels of automobiles and the like so that they can rotate with respect to a suspension device are available for driving wheels and for driven wheels.・ Compact is progressing. As an example of the conventional structure, a wheel bearing device on the driven wheel side as shown in FIG. 10 is known.

  This wheel bearing device is referred to as a third generation, and includes an inner member 51, an outer member 60, and double-row balls 56, 56 accommodated between the members 51, 60 so as to roll freely. . The inner member 51 includes a hub ring 52 and an inner ring 53 press-fitted into the hub ring 52.

  The hub wheel 52 integrally has a wheel mounting flange 54 for mounting a wheel (not shown) at an end portion on the outer side, and a hub bolt for fixing the wheel at a circumferentially equidistant position of the wheel mounting flange 54. 55 are planted. Further, on the outer periphery of the hub wheel 52, one inner rolling surface 52a and a small diameter step portion 52b extending in the axial direction from the inner rolling surface 52a are formed. The inner ring 53 having the other inner rolling surface 53a formed on the outer periphery is press-fitted into the small-diameter step portion 52b, and the end portion of the small-diameter step portion 52b is plastically deformed radially outward. The portion 52 c prevents the inner ring 53 from coming off in the axial direction with respect to the hub ring 52.

  The outer member 60 integrally has a vehicle body mounting flange 60b for mounting to the vehicle body (not shown) on the outer periphery, and double row outer rolling surfaces 60a, 60a are formed on the inner periphery. Double rows of balls 56, 56 are accommodated between the rolling surfaces 60a, 52a and 60a, 53a of the outer member 60 and the inner member 51, and are held by the cages 57, 57 so as to be freely rollable. . In addition, seals 58 and 59 are attached to the opening of the annular space formed between the outer member 60 and the inner member 51, and leakage of lubricating grease sealed inside the bearing and rainwater and dust from the outside. Etc. are prevented from entering the inside of the bearing.

  Here, the knuckle 61 is integrally formed with a disk-shaped bottom portion 61a, and the inner end portion of the inner member 51 is closed. Moreover, the pilot part for fitting with the knuckle 61 is not formed in the outer periphery of the outer member 60, and the vehicle body mounting flange 60b is joined to the knuckle 61 via a bolt (not shown). Yes. As a result, the apparatus can be reduced in weight and size, and the rigidity and strength of the knuckle 61 can be improved.

Further, the inner end portions of the inner member 51 and the outer member 60 are closed by the bottom portion 61a of the knuckle 61, and a drain hole 62 is formed in the downward direction on the road surface side of the outer member 60. The closed space 63 formed between 60 and the knuckle 61 communicates with the outside. As a result, even if foreign matter such as rainwater or dust enters from the joint between the vehicle body mounting flange 60b and the knuckle 61, it can be easily discharged and entry into the bearing can be prevented.
JP 2007-237771 A

  In such a conventional wheel bearing device, a drain hole 62 is formed in the outer member 60 to discharge foreign matters such as rainwater and dust that have entered from the joint between the vehicle body mounting flange 60b and the knuckle 61. However, if the drain hole 62 is simply provided in the closed space 63, the internal pressure of the closed space 63 becomes lower than the external atmospheric pressure when the foreign matter is discharged, and the foreign matter may not be easily discharged. In addition, the number of steps for forming the drain hole 62 in the outer member 60 and the knuckle 61 is increased, resulting in a cost increase.

  The present invention has been made in view of such a conventional problem, and there is no pilot portion for fitting with the knuckle on the outer periphery of the outer member, and the vehicle body mounting flange is joined to the knuckle in a butted state. An object of the present invention is to provide a wheel bearing device having a structure that can be easily discharged even if foreign matter enters the closed space between the knuckle and the outer member in the wheel bearing device on the driving wheel side.

In order to achieve such an object, the invention according to claim 1 of the present invention has a vehicle body mounting flange integrally attached to a knuckle constituting a suspension device on the outer periphery, and a double row outer rolling surface on the inner periphery. , An outer member integrally formed with the wheel mounting flange at one end, a hub wheel formed with a small-diameter step portion extending in the axial direction from the wheel mounting flange, and a small-diameter step portion of the hub wheel An inner member formed of at least one inner ring press-fitted into the outer periphery, and formed with a double row inner rolling surface facing the outer surface of the double row on the outer periphery, and the inner member and the outer member. A double row rolling element accommodated between the rolling surfaces via a cage, and a seal attached to an opening of an annular space formed between the outer member and the inner member The vehicle body mounting flange and the knuckle are in a butted state, Rectangular member are joined by bolts to the knuckle, the wheel bearing apparatus of the driven wheel which is closed the opening of the inner side by the knuckles of the outer member, the inner of the vehicle body mounting flange of the outer member The end on the side protrudes axially inward from the end of the inner member, and the inner end of the body mounting flange has an inner diameter larger than the fitting surface of the inner seal of the seal. An annular recess is formed, and a drain hole is formed at the joint between the vehicle body mounting flange and the knuckle so that the recess communicates with the outside, and this drain hole is located in one circumferential direction closest to the road surface. together is placed, an air vent hole communicating with the closed space and the outside is formed between the outer member and the knuckle are formed, the air vent hole is disposed on the side farthest from the road surface, those Air vent hole and the drain hole is formed in the axial direction the same position.

As described above, the inner ring rotating type driven wheel side in which the vehicle body mounting flange and the knuckle are in contact with each other, the outer member is joined to the knuckle through the bolt, and the inner side opening of the outer member is closed by the knuckle. In the wheel bearing device, the inner side end of the outer body mounting flange of the outer member protrudes axially inward from the end of the inner member, and a seal is formed on the inner periphery of the inner end of the body mounting flange. An annular recess having a larger diameter than the fitting surface of the inner seal is formed, and a drain hole is formed at the joint between the vehicle body mounting flange and the knuckle so as to communicate the recess with the outside. with drain holes are arranged in the circumferential direction one position closest from the road surface, air vent hole communicating with the closed space and the outside is formed between the outer member and the knuckle are formed, the It arranged farthest vent hole from the road surface, since the air vent hole and the drain hole is formed in the axial direction the same position, the foreign matter from the drain holes from reaching the foreign substance rainwater or dusts into the closed space In addition to preventing, even if foreign matter enters from the joint between the vehicle body mounting flange and the knuckle, the internal pressure of the enclosed space is always atmospheric due to the air vent hole, and it is easily discharged from the drain hole without any foreign matter remaining in the enclosed space. be able to.

  Further, as in the invention described in claim 2, the vehicle body mounting flange and the knuckle may be joined via a back plate constituting a brake, and the back plate may be formed by pressing from a steel plate.

  Further, as in a third aspect of the present invention, the drain hole may be formed through the end of the vehicle body mounting flange in the radial direction.

  According to a fourth aspect of the present invention, the drain hole is formed at an end surface position of the vehicle body mounting flange of the back plate, and the hole diameter of the drain hole is larger than the end surface width. May be. Thereby, since it forms simultaneously with the press processing of a backplate, the additional process by machining is unnecessary and cost reduction can be achieved.

  Further, as in the invention described in claim 5, if the air vent hole is formed to penetrate the end portion of the vehicle body mounting flange in the radial direction, and the hole diameter is smaller than the drain hole, It is possible to minimize the entry of foreign matter such as rainwater and dust from the air vent hole.

  According to a sixth aspect of the present invention, the air vent hole is formed in the back plate and is disposed on the farthest side from the road surface at the end face position of the vehicle body mounting flange, and the air vent is wider than the end face width. The hole diameter may be large.

  According to a seventh aspect of the present invention, the sensor mounting of the rotational speed sensor for detecting the rotational speed of the wheel at one circumferential position on the side farthest from the road surface of the member to which the vehicle body mounting flange is mounted. If a hole is formed and there is a slight gap that allows air to flow through the fitting portion between the sensor mounting hole and the rotation speed sensor, foreign matter may enter from the joint with the vehicle body mounting flange. The internal pressure of the closed space is always atmospheric pressure due to the gap between the fitting portions, and the foreign matter can be easily discharged from the drain hole without remaining in the closed space.

  Further, as in the invention described in claim 8, a through hole is formed on the side closest to the road surface of the knuckle, and a drain hole is formed at one circumferential position on the side closest to the road surface of the back plate. If the drain hole is arranged to be biased to the edge of the through hole on the road surface side and is formed to have a smaller diameter than the through hole, foreign matter such as rainwater and dust that has entered from the outside flows downward due to gravity. When discharged from the drain hole to the outside, an air passage is formed above the drain hole, so that the closed space can be substantially communicated with the outside. Therefore, the foreign matter can be easily discharged from the drain hole to the outside through the through hole without being affected by the external atmospheric pressure.

  Further, as in the ninth aspect of the invention, the inner seal is a core metal that is press-fitted into the inner periphery of the end portion of the outer member, and is vulcanized and bonded integrally to the core metal so that the side lip is A sealing plate having a sealing member, a cylindrical portion press-fitted into the outer diameter of the inner ring, and a slinger comprising a standing plate portion extending radially outward from the cylindrical portion, and the cross section is substantially L-shaped. The side lip is slidably contacted with the upright plate portion, and the drain hole of the back plate is positioned below the slidable contact position of the side lip. Then, even if foreign matter such as rain water or dust enters from the labyrinth gap of the seal, it does not reach the sliding contact position of the side lip, and the foreign matter is discharged to the outside through this drain hole. Therefore, the sealing performance can be improved and the durability of the seal can be increased.

  Further, as in the invention described in claim 10, the inner side seal is a core metal press-fitted into the inner periphery of the end portion of the outer member, and is vulcanized and bonded integrally to the core metal so that the side lip is A sealing plate having a sealing member, a cylindrical portion press-fitted into the outer diameter of the inner ring, and a slinger comprising a standing plate portion extending radially outward from the cylindrical portion, and the cross section is substantially L-shaped. If the side lip is slidably contacted with the upright plate portion and the position of the drain hole is disposed below the fitting surface of the seal plate Further, foreign matter such as rain water and dust can be prevented from entering from the labyrinth gap of the seal, and the foreign matter is discharged to the outside through the drain hole. Therefore, the sealing performance can be further improved and the durability of the seal can be further enhanced.

A wheel bearing device according to the present invention has a vehicle body mounting flange integrally attached to a knuckle constituting a suspension device on an outer periphery, and an outer member in which a double row outer rolling surface is integrally formed on an inner periphery; And a hub wheel integrally having a wheel mounting flange at one end, a small diameter step portion extending in the axial direction from the wheel mounting flange, and at least one inner ring press-fitted into the small diameter step portion of the hub wheel. An inner member having a double-row inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and a cage between both rolling surfaces of the inner member and the outer member. A plurality of rolling elements accommodated in a freely rotatable manner, and a seal attached to an opening of an annular space formed between the outer member and the inner member, and the vehicle body mounting flange and the knuckle And the outer member is bolted to the knuckle. Are joined through the outer side in the wheel bearing apparatus for a driven wheel side of the opening portion of the inner side is closed by the knuckle member, the outer end portion of the inner side of the body mounting flange of the member in the rectangular projecting axially inner side from the end portion of the member, the circumferential inner end of the inner side of the body mounting flange, diameter of the annular recess from the fitting surface of the inner side of the seal of the seal is formed In addition, a drain hole is formed at the joint between the vehicle body mounting flange and the knuckle so as to communicate the recess with the outside, and the drain hole is disposed at one circumferential position on the side closest to the road surface. outer member and the air vent hole is formed for communicating the enclosed space and the outside which is formed between the knuckle, the air vent hole is disposed on the side farthest from the road surface, the drain hole and the air vent hole Because it is formed in the axial direction the same position, the foreign matter from the drain holes to prevent the foreign substances rain water or dusts from entering the closed space, even the foreign matter from the junction between the body mounting flange and the knuckle invades The internal pressure of the closed space is always atmospheric pressure by the air vent hole, and the foreign matter can be easily discharged from the drain hole without remaining in the closed space.

A body mounting flange that is attached to the knuckle that constitutes the suspension device on the outer periphery is integrated, an outer member that is integrally formed with a double row outer rolling surface on the inner periphery, and a wheel mounting flange that is integrated with one end. A hub wheel having one inner rolling surface facing the outer rolling surface of the double row on the outer periphery, a small diameter step portion extending in the axial direction from the inner rolling surface, and a small diameter of the hub wheel An inner member consisting of an inner ring that is press-fitted into a stepped portion and has the other inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and both rolling of the inner member and the outer member A double row rolling element accommodated between the faces via a cage, and a seal attached to an opening of an annular space formed between the outer member and the inner member. The inner ring is axially moved by a caulking portion formed by plastically deforming an end portion of the small diameter step portion radially outward. The outer member is fixed to the vehicle body mounting flange and the knuckle but the outer member is joined to the knuckle via a bolt, and the opening on the inner side of the outer member is closed by the knuckle. In the wheel bearing device on the driving wheel side, the inner side end of the outer body mounting flange of the outer member protrudes inward in the axial direction from the end of the inner member, and the inner end of the inner side of the body mounting flange An annular recess having a larger diameter than the fitting surface of the seal on the inner side of the seal is formed around the circumference, and the recess from the road surface at the end of the vehicle body mounting flange is connected to the outside so as to communicate with the outside. with a drain hole penetrating in the radial direction in the circumferential direction one place near side is formed, the vehicle body from the mounting flange end of the road through the far side in the radial direction air vent hole is formed, Air vent hole is disposed farthest from the road surface, the drain hole and the air vent hole is formed in the axial direction the same position, it has a smaller diameter than the pore diameter of the drain hole.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device according to the present invention, and FIG. 2 is an enlarged view of a main part of FIG. In the following description, the side closer to the outer side of the vehicle when assembled to the vehicle is referred to as the outer side (left side in FIG. 1), and the side closer to the center is referred to as the inner side (right side in FIG. 1).

  This wheel bearing device is referred to as the third generation on the driven wheel side, and is a double row rolling element (ball) accommodated between the inner member 1 and the outer member 10 and between both members 1 and 10 so as to roll freely. 6 and 6. The inner member 1 includes a hub ring 2 and an inner ring 3 that is press-fitted into the hub ring 2 through a predetermined scissors.

  The hub wheel 2 integrally has a wheel mounting flange 4 for mounting a wheel (not shown) at an end on the outer side, and a hub bolt for fixing the wheel at a circumferentially equidistant position of the wheel mounting flange 4. 5 is implanted, and a circular hole 4 a is formed between the hub bolts 5 of the wheel mounting flange 4. The hub wheel 2 can be reduced in weight by the circular hole 4a. Further, on the outer periphery of the hub wheel 2, one (outer side) inner rolling surface 2a and a small-diameter step portion 2b extending in the axial direction from the inner rolling surface 2a are formed. And the inner ring | wheel 3 in which the inner side rolling surface 3a of the other (inner side) was formed in the outer periphery is press-fit in this small diameter step part 2b, and also the edge part of the small diameter step part 2b is plastically deformed to radial direction outward. The inner ring 3 is fixed to the hub ring 2 in the axial direction in a state where a predetermined bearing preload is applied by the formed caulking portion 2 c.

  The hub wheel 2 is made of medium-high carbon steel (carbon steel for SC-based mechanical structure of JIS standard) containing 0.40 to 0.80% by weight of carbon such as S53C, and includes an inner side rolling surface 2a on the outer side, The surface hardness is hardened in the range of 58 to 64 HRC by induction hardening over the small diameter step 2b from the base 4b on the inner side of the wheel mounting flange 4 which becomes a seal land portion of the outer seal 8 which will be described later. . The caulking portion 2c is an unquenched portion having a surface hardness of 25HRC or less after forging. Such a hardening treatment improves the strength of the hub wheel 2 and suppresses wear of the base portion 4b serving as the seal land portion and fretting wear of the small-diameter step portion 2b serving as the fitting surface of the inner ring 3, thereby improving durability. Moreover, the workability of the caulking portion 2c can be improved, and the occurrence of cracks and the like due to plastic deformation can be prevented. The inner ring 3 and the rolling element 6 are made of high carbon chrome steel made of SUJ2 or the like, and are hardened in the range of 58 to 64 HRC up to the core.

  The outer member 10 integrally has a vehicle body mounting flange 10b for mounting to the vehicle body (not shown) on the outer periphery, and double row outer rolling surfaces 10a, 10a are integrally formed on the inner periphery. This outer member 10 is formed of medium and high carbon steel containing 0.40 to 0.80% by weight of carbon such as S53C, like the hub wheel 2, and the double row outer raceway surfaces 10a and 10a are surfaced by induction hardening. Hardening is performed in the range of 58 to 64 HRC. And the double row rolling elements 6 and 6 are accommodated between each rolling surface 10a, 2a and 10a, 3a, and these double row rolling elements 6 and 6 are rollably hold | maintained by the holder | retainers 7 and 7. ing. Seals 8 and 9 are attached to the opening of the annular space formed between the outer member 10 and the inner member 1, and leakage of lubricating grease sealed inside the bearing and rainwater and dust from the outside. Etc. are prevented from entering the inside of the bearing.

  Here, the wheel bearing device referred to as the third generation in which the inner raceway surface 2a is directly formed on the outer periphery of the hub wheel 2 is illustrated, but the wheel bearing device according to the present invention is not limited to such a structure. For example, although not shown, a second generation structure in which a pair of inner rings are press-fitted into the small-diameter step portion of the hub ring may be used. Moreover, although the wheel bearing comprised by the double row angular contact ball bearing which used the rolling elements 6 and 6 as the ball | bowl was illustrated, it comprised not only this but the double row tapered roller bearing which used the tapered roller for the rolling element. Also good.

  Here, the pilot part for fitting with the knuckle 11 is not formed on the outer periphery of the outer member 10, and the vehicle body mounting flange 10b is joined to the knuckle 11 via a bolt (not shown). ing. That is, the opening on the inner side of the outer member 10 is closed by the knuckle 11.

  In the present embodiment, the vehicle body mounting flange 10b of the outer member 10 and the knuckle 11 are joined via the back plate 12 constituting the drum brake. In the outer member 10, a drain hole 13 is formed by penetrating in the radial direction at one place in the circumferential direction closest to the road surface of the vehicle body mounting flange 10b, and at one place in the circumferential direction farthest from the road surface. An air vent hole 14 is formed so as to penetrate in the direction, and the closed space 15 formed between the outer member 10 and the back plate 12 communicates with the outside. Thus, foreign matter such as rainwater and dust can be prevented from entering the closed space 15 from the drain hole 13, and even if foreign matter enters from the joint between the vehicle body mounting flange 10 b and the back plate 12, 14, the internal pressure of the closed space 15 always becomes atmospheric pressure, and foreign matter can be easily discharged from the drain hole 13 without remaining in the closed space 15.

  The air vent holes 14 are not limited to one place in the circumferential direction on the side farthest from the road surface, and may be provided at a plurality of places as long as they are far from the road surface. Further, unlike the drain hole 13, the air vent hole 14 is less likely to be clogged with muddy water or the like, and therefore, the hole diameter is preferably smaller than the drain hole 13 and as small as possible. Thereby, it is possible to minimize the entry of foreign matter such as rainwater and dust from the air vent hole 14 into the interior.

  Furthermore, in this embodiment, sensor mounting holes 16 and 17 of a rotational speed sensor (not shown) for detecting the rotational speed of the wheel at one place in the circumferential direction farthest from the road surface of the knuckle 11 and the back plate 12. Is formed. An effect similar to that of the air vent hole 14 described above can be obtained by providing a slight gap to the extent that air flows in the fitting portion between the sensor mounting holes 16 and 17 and the rotation speed sensor. Usually, a rotational speed sensor is attached to the sensor mounting holes 16 and 17 via a seal ring such as an O-ring. For example, the same effect as that of the air vent hole 14 can be obtained by eliminating the seal ring. be able to.

  As shown in an enlarged view in FIG. 2, an annular recess 18 is formed on the inner periphery of the inner side end of the vehicle body mounting flange 10 b in the outer member 10. A drain hole 13 is formed so that the recess 18 communicates with the outside. As a result, foreign matter such as rainwater and dust that has entered the closed space 15 from the outside flows downward due to gravity and stays in the recess 18 without remaining in the vicinity of the seal 9, and easily and quickly to the outside. Since it is discharged | emitted, the sealing performance of the seal | sticker 9 can be improved. In the present embodiment, the structure in which the outer member 10 and the knuckle 11 are joined via the back plate 12 is illustrated, but it goes without saying that the structure in which the outer member 10 and the knuckle 11 are directly joined may be used. . Moreover, although the drain hole 13 and the air vent hole 14 mentioned above illustrated what was comprised by the circular hole, it does not necessarily need to be a circular hole and may be a rectangle, an eyebrows shape, or an oval shape. .

  FIG. 3 is a longitudinal sectional view showing a second embodiment of the wheel bearing device according to the present invention, FIG. 4 is a view taken along the line IV-IV in FIG. 3, and FIG. FIG. This embodiment basically differs from the above-described embodiment only in the configuration of the drain hole, and other detailed descriptions of the same parts and parts having the same functions or parts having the same functions are denoted by the same reference numerals. Is omitted.

  In the present embodiment, as shown in FIG. 3, the pilot portion for fitting with the knuckle 11 is not formed on the outer periphery of the outer member 19 as in the first embodiment described above. In this state, the vehicle body mounting flange 19a is joined to the knuckle 11 by a bolt (not shown) through the back plate 20.

  In the present embodiment, as shown in FIG. 4, a plurality (four in this case) of bolt holes 20 a and sensor mounting holes 16 are formed in the back plate 20, and a drain is provided at one place in the circumferential direction closest to the road surface. The air vent hole 22 is formed in the hole 21 and at least one place in the circumferential direction on the side farthest from the road surface. Since the drain hole 21 and the air vent hole 22 are formed at the end face position of the vehicle body mounting flange 19a in the outer member 19, and the hole diameter is formed larger than the end face width, the outer member 19 and the back plate are formed. The closed space 15 formed between the outer space 20 and the outside can be communicated with each other. As a result, as shown in FIG. 5, foreign matter such as rainwater and dust that has entered the enclosed space 15 from the outside flows downward due to gravity and stays in the recess 18 without remaining in the vicinity of the seal 9. Quickly and quickly. Furthermore, since the drain hole 21 and the air vent hole 22 are formed at the same time when the back plate 20 is pressed, no additional machining by machining is required, and the cost can be reduced.

  6 is a longitudinal sectional view showing a third embodiment of the wheel bearing device according to the present invention, FIG. 7 is an enlarged view of a main part of FIG. 6, and FIG. 8 is an enlarged main part of a modification of FIG. FIG. 9 is an enlarged view of a main part showing still another modification. This embodiment basically differs from the second embodiment described above only in the configuration of the knuckle and the drain hole, and the same reference numerals are given to the same parts or parts having the same functions. Detailed description thereof will be omitted.

  In the present embodiment, as in the first embodiment described above, as shown in FIG. 6, a pilot portion for fitting with the knuckle 23 is not formed on the outer periphery of the outer member 19, but the butt knuckle 23 is abutted. In this state, the vehicle body mounting flange 19 a is joined to the knuckle 23 by a bolt (not shown) through the back plate 24.

  In the present embodiment, a through hole 25 is formed on the side closest to the road surface of the knuckle 23, and a drain hole 26 is formed at one circumferential position on the side closest to the road surface of the back plate 24. The drain hole 26 is arranged so as to be biased to the edge of the through hole 25 on the road surface side, and is formed to have a smaller diameter than the through hole 25. Accordingly, as shown in FIG. 7, when foreign matter such as rainwater or dust that has entered the enclosed space 15 from the outside flows into the lower recess 18 due to gravity and is discharged to the outside from the drain hole 26, the drain hole 26. An air passage is formed above the closed space, and the closed space 15 can be substantially communicated with the outside. Therefore, the foreign matter can be easily discharged to the outside from the drain hole 26 through the through hole 25 without being affected by the external atmospheric pressure.

  Here, as shown in FIG. 8, the inner side seal 9 is constituted by a pack seal composed of an annular seal plate 27 and a slinger 28 which are substantially L-shaped in cross section and arranged to face each other. That is, the seal plate 27 is press-fitted into the inner periphery of the end portion of the outer member 19, and the core metal 29 is integrally vulcanized and bonded to the side lip 30a and the inner diameter side of the side lip 30a. The seal member 30 has a bifurcated grease lip 30b and an intermediate lip 30c, and a slinger 28 is press-fitted into the outer diameter of the inner ring 3, and a radially outer portion from the cylindrical portion 28a. The side lip 30a of the seal member 30 is in sliding contact with the standing plate 28b, and the grease lip 30b and the intermediate lip 30c are in sliding contact with the cylindrical portion 28a. There. In this case, it is assumed that foreign matter such as rainwater and dust has entered from the labyrinth gap 33 of the seal 9 by disposing the drain hole 32 of the back plate 31 below the sliding contact position of the side lip 30a, that is, on the road surface side. However, the slidable contact position of the side lip 30a is not reached, and the foreign matter is discharged to the outside through the drain hole 32. Therefore, the sealing performance can be improved and the durability of the seal 9 can be increased.

  As shown in FIG. 9, when the annular recess 18 is formed on the inner periphery of the inner side end of the vehicle body mounting flange 19a in the outer member 19, the position of the drain hole 32 of the back plate 31 is set as a seal plate. By arranging it below the fitting surface 27, it is possible to prevent foreign matters such as rainwater and dust from entering from the labyrinth gap 33 of the seal 9, and the foreign matter is discharged to the outside through the drain hole 32. . Therefore, the sealing performance can be further improved and the durability of the seal 9 can be further enhanced.

  The embodiment of the present invention has been described above, but the present invention is not limited to such an embodiment, and is merely an example, and various modifications can be made without departing from the scope of the present invention. Of course, the scope of the present invention is indicated by the description of the scope of claims, and further, the equivalent meanings described in the scope of claims and all modifications within the scope of the scope of the present invention are included. Including.

  In the wheel bearing device according to the present invention, the pilot wheel for fitting with the knuckle is not formed on the outer periphery of the outer member on the driven wheel side, and the vehicle body mounting flange is connected to the knuckle via the bolt. The present invention can be applied to an inner ring rotating type second-generation or third-generation wheel bearing device to be joined.

It is a longitudinal section showing a 1st embodiment of a bearing device for wheels concerning the present invention. It is a principal part enlarged view of FIG. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention. It is the arrow line view seen from the IV-IV line of FIG. It is a principal part enlarged view of FIG. It is a longitudinal cross-sectional view which shows 3rd Embodiment of the wheel bearing apparatus which concerns on this invention. It is a principal part enlarged view of FIG. It is a principal part enlarged view which shows the modification of FIG. It is a principal part enlarged view which shows the other modification of FIG. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus.

Explanation of symbols

1 .... inner member 2 .... hub wheels 2a, 3a ... inward rolling surface 2b ...・ ・ ・ ・ ・ ・ ・ ・ Small diameter step 2c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Clamping portion 3 ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 4 ... Wheel mounting flange 4a ... Round hole 4b ... Base 5 on the inner side of the wheel mounting flange ... ... Hub bolts 6 ... Rolling elements 7 ... Cages 8 ... Outer side Seal 9... Inner side seals 10 and 19... Outer member 10 a... Outer rolling surface 10 b and 19 a .... Car body mounting flanges 11, 23 ... Knuckle 1 20, 24, 31... Back plate 13, 21, 26, 32... Drain hole 14, 22... Air vent hole 15. 17 ... Sensor mounting hole 18 ... Recess 20a ... Bolt hole 25 ...・ Through hole 27 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal plate 28 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Slinger 28a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cylindrical portion 28b ・ ・.... Standing plate part 29 ... Core metal 30 ... Seal member 30a ... Side lip 30b ········ Grease lip 30c ··· Intermediate lip 33 ·········· Labyrinth gap 51 ········ Inner member 5 ·················· Hub wheels 52a, 53a ··· Inner rolling surface 52b ··· Small diameter stepped portion 52c ·········・ Fastening part 53 ・ ・ ・ ・ ・ ・ Inner ring 54 ・ ・ ・ ・ ・ ・ Wheel mounting flange 55 ・ ・ ・ ・ ・ ・ Hub bolt 56 ・ ・ ・ ・·································································.・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer rolling surface 60b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flange 61 ・ ・ ・ ・ ・ ・ ・ ・ Knuckle 61a ・ ・ ・ ・ ・ ・ ・ ・..Bottom part 62 ... Drain hole 63 ... Closed space

Claims (10)

An outer member integrally having a vehicle body mounting flange attached to a knuckle constituting a suspension device on the outer periphery, and an outer rolling surface of a double row integrally formed on the inner periphery;
It has a wheel mounting flange integrally at one end, a hub wheel formed with a small diameter step portion extending in the axial direction from the wheel mounting flange, and at least one inner ring press-fitted into the small diameter step portion of the hub wheel, An inner member in which a double row inner rolling surface facing the outer row rolling surface of the double row is formed on the outer periphery;
A double row rolling element housed between the rolling surfaces of the inner member and the outer member so as to be freely rollable via a cage;
A seal attached to an opening of an annular space formed between the outer member and the inner member;
For the wheel on the driven wheel side in which the outer member is joined to the knuckle via a bolt in a state where the vehicle body mounting flange and the knuckle are abutted, and the opening on the inner side of the outer member is closed by the knuckle In the bearing device,
The inner side end of the vehicle body mounting flange of the outer member protrudes inward in the axial direction from the end of the inner member, and the inner side of the seal on the inner periphery of the inner side end of the vehicle body mounting flange. An annular recess having a larger diameter than the fitting surface of the seal is formed, and a drain hole is formed at the joint between the vehicle body mounting flange and the knuckle so as to communicate the recess with the outside. while being circumferentially arranged one place closest from the road surface, air vent hole communicating with the closed space and the outside is formed between the outer member and the knuckle are formed, most air vent hole from the road surface A wheel bearing device, wherein the wheel bearing device is disposed on a far side, and the air vent hole and the drain hole are formed at the same position in the axial direction .   The wheel bearing device according to claim 1, wherein the vehicle body mounting flange and the knuckle are joined via a back plate constituting a brake, and the back plate is formed from a steel plate by pressing.   The wheel bearing device according to claim 1 or 2, wherein the drain hole is formed so as to penetrate in a radial direction at an end portion of the vehicle body mounting flange.   3. The wheel bearing device according to claim 2, wherein the drain hole is formed at an end surface position of the vehicle body mounting flange of the back plate, and the diameter of the drain hole is larger than the width of the end surface.   The wheel bearing device according to any one of claims 1 to 4, wherein the air vent hole is formed so as to penetrate in a radial direction at an end portion of the vehicle body mounting flange, and the hole diameter is formed smaller than the drain hole.   The air vent hole is formed in the back plate, and is disposed on the farthest side from the road surface at the end face position of the vehicle body mounting flange, and the diameter of the air vent hole is formed larger than the end face width. The wheel bearing apparatus in any one of 2 thru | or 4.   A sensor mounting hole of a rotational speed sensor for detecting the rotational speed of the wheel is formed at one circumferential position on the side farthest from the road surface of the member to which the vehicle body mounting flange is mounted. The sensor mounting hole and the rotational speed The wheel bearing device according to any one of claims 1 to 4, wherein a slight gap is provided to allow air to flow in a fitting portion with the sensor.   A through hole is formed on the side closest to the road surface of the knuckle, a drain hole is formed at one circumferential position on the side closest to the road surface of the back plate, and the drain hole is an edge on the road surface side of the through hole. The wheel bearing device according to claim 2, wherein the wheel bearing device is arranged so as to be biased toward the portion and has a smaller diameter than the through hole.   The inner side seal is a core metal that is press-fitted into the inner periphery of the end of the outer member, a seal plate that is integrally vulcanized and bonded to the core metal and has a side lip, and an outer ring of the inner ring. A cylindrical portion that is press-fitted into a diameter, and a slinger composed of a standing plate portion that extends radially outward from the cylindrical portion, and is configured by a pack seal that has a substantially L-shaped cross section and is disposed to face each other, The wheel bearing device according to claim 8, wherein the side lip is slidably contacted with the upright plate portion, and the position of the drain hole of the back plate is disposed below the slidable contact position of the side lip.   The inner side seal is a core metal that is press-fitted into the inner periphery of the end of the outer member, a seal plate that is integrally vulcanized and bonded to the core metal and has a side lip, and an outer ring of the inner ring. A cylindrical portion that is press-fitted into a diameter, and a slinger composed of a standing plate portion that extends radially outward from the cylindrical portion, and is configured by a pack seal that has a substantially L-shaped cross section and is disposed to face each other, The wheel bearing device according to any one of claims 1 to 9, wherein a side lip is slidably contacted with the upright plate portion, and a position of the drain hole is disposed below a fitting surface of the seal plate. .

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