JP5623592B2 - Sensor cap for wheel bearing device with rotation speed detection device, wheel bearing device with rotation speed detection device provided with the same, and method for manufacturing sensor cap for wheel bearing device with rotation speed detection device - Google Patents

Description

The present invention is rotatably bearing apparatus for supporting against the suspension device the wheel of an automobile or the like, in particular, the rotation speed detecting device for detecting the rotational speed of the wheel is built, the rotational speed with improved sealability The present invention relates to a sensor cap for a wheel bearing device with a detection device, a wheel bearing device with a rotation speed detection device including the sensor cap, and a method of manufacturing a sensor cap for a wheel bearing device with a rotation speed detection device .

  A wheel bearing with a rotation speed detecting device that rotatably supports a vehicle wheel with respect to a suspension device and controls an anti-lock brake system (ABS) to detect the rotation speed of the wheel. Devices are generally known. Conventionally, in such a wheel bearing device, a sealing device is provided between an inner member and an outer member that are in rolling contact with a rolling element, and a magnetic encoder in which magnetic poles are alternately arranged in a circumferential direction is provided as the sealing device. In addition, the rotational speed detecting device is constituted by a magnetic encoder and a rotational speed sensor that is arranged facing the magnetic encoder and detects a magnetic pole change of the magnetic encoder accompanying the rotation of the wheel.

  In general, the rotational speed sensor is attached to the knuckle after the wheel bearing device is attached to the knuckle constituting the suspension device. However, in order to eliminate the complexity of adjusting the air gap between the rotational speed sensor and the magnetic encoder and to achieve a more compact design, recently, a bearing for a wheel with a rotational speed detection device that also incorporates the rotational speed sensor in the bearing. A device has been proposed.

  A structure as shown in FIG. 8 is known as an example of such a wheel bearing device with a rotational speed detection device. This wheel bearing device with a rotational speed detection device is supported and fixed to a knuckle (not shown), and is inserted into the outer member 51 serving as a fixing member and the outer member 51 via double rows of balls 53 and 53. And an inner member 52. The inner member 52 includes a hub ring 55 and an inner ring 56 that is externally fitted to the hub ring 55.

  The outer member 51 integrally has a vehicle body mounting flange 51b on the outer periphery, and double row outer rolling surfaces 51a and 51a are formed on the inner periphery. On the other hand, the inner member 52 is formed with double-row inner rolling surfaces 55a and 56a facing the outer rolling surfaces 51a and 51a of the outer member 51 described above. Of the double row inner rolling surfaces 55 a and 56 a, one inner rolling surface 55 a is integrally formed on the outer periphery of the hub wheel 55, and the other inner rolling surface 56 a is formed on the outer periphery of the inner ring 56. The inner ring 56 is press-fitted into a shaft-shaped small-diameter step portion 55 b that extends in the axial direction from the inner rolling surface 55 a of the hub wheel 55. The double-row balls 53 and 53 are respectively accommodated between the rolling surfaces and are held by the cages 57 and 57 so as to be freely rollable.

  The hub wheel 55 integrally has a wheel mounting flange 54 for mounting a wheel (not shown) on the outer periphery, and a crimped portion 58 is formed by plastically deforming the end portion of the small diameter step portion 55b radially outward. The inner ring 56 is fixed in the axial direction by the caulking portion 58. A seal 59 and a sensor cap 63 are attached to the end of the outer member 51 to prevent leakage of the lubricating grease sealed inside the bearing and intrusion of rainwater, dust, etc. into the bearing from the outside. Yes.

  A magnetic encoder 60 is press-fitted into the outer periphery of the inner ring 56. The magnetic encoder 60 is composed of a support ring 61 formed in an annular shape having a substantially L-shaped cross section by a magnetic metal plate, and an encoder body 62 attached to a side surface of the support ring 61. The encoder body 62 is made of a permanent magnet such as rubber mixed with ferrite powder, and S poles and N poles are alternately magnetized at equal intervals in the circumferential direction.

  The sensor cap 63 is fitted to the inner periphery of the inner end of the outer member 51 and closes the opening of the outer member 51. The sensor cap 63 includes a bottomed cylindrical cap body 64 formed by injection molding a synthetic resin, and a metal ring 65 coupled to the cap body 64. The metal ring 65 is formed in an annular shape having an L-shaped cross section by pressing a steel plate. The cap body 64 is integrated with the cap body 64 by molding at the time of injection molding.

  A protrusion 66 protruding in the axial direction is formed on the radially outer portion of the cap body 64, and an insertion hole 67 is formed in the protrusion 66 at a position corresponding to the magnetic encoder 60. As shown in FIG. 9, a sleeve 68 is fitted to the inner peripheral surface of the insertion hole 67, and a sensor 69 is inserted into the sleeve 68 via an O-ring 70. This sensor 69 incorporates a magnetic detection element 71 that changes its characteristics according to the flow direction of magnetic flux, such as a Hall element, a magnetoresistive element (MR element), and a waveform shaping circuit that adjusts the output waveform of the magnetic detection element 71. An anti-lock brake system for an automobile, which is composed of an IC or the like, detects the rotational speed of the wheel and controls its rotational speed.

  A mounting piece 72 is projected from the sensor 69. The attachment piece 72 has a bolt insertion hole 73, and a sleeve 74 is fitted into the bolt insertion hole 73. The sensor 69 is attached to the cap body 64 by screwing the sensor fixing bolt 75 inserted into the sleeve 74 into the insert nut 76.

  Here, the cap main body 64 and the sensor 69 are made of a PA (polyamide) 612, PPS (polyphenylene sulfide) based low water absorption plastic material, and prevent the dimensional change and crack generation due to water absorption of the sensor mounting member, and are sealed. (See, for example, Patent Document 1).

JP 2007-120560 A

  In such a conventional wheel bearing device with a rotational speed detection device, as shown in FIG. 10, the cap body 64 is formed by injection molding synthetic resin. Molded by pouring into a mold. The inlet to the gate 77 has a conical shape as shown by a two-dot chain line in FIG. 10A, and is formed integrally with the mold body. Therefore, the gate 77 is provided at a position away from the protrusion 66 so that the protrusion 66 of the cap body 64 and the injection port do not interfere with each other.

  However, when the gate 77 moves away from the center of the cap body 64, the flow of the synthetic resin flows in the circumferential direction along the fitting portion as indicated by an arrow in (b). Then, while the synthetic resin flows smoothly in the circumferential direction in the A part, the synthetic resin stays in the B part, and a difference occurs in the flow speed of the synthetic resin. Will occur.

  In other words, the synthetic resin hardly contracts in the portion A where the synthetic resin flows smoothly, and the synthetic resin easily contracts in the portion B where the synthetic resin stays. In this case, not only sink marks or the like occur in the B portion, but the cap body 64 becomes elliptical, and the roundness of the fitting portion is lost. As a result, the sealing performance of the fitting portion is lowered, and foreign matter such as rainwater and dust may enter the bearing from the outside, and the sensor cap 63 is detached from the outer member 51 due to vibration and impact during traveling of the vehicle. There was a risk that the air gap set in the initial stage would collapse.

The present invention has been made in view of such conventional problems, and is for a wheel bearing device with a rotational speed detection device that improves the accuracy of a sensor cap and ensures the sealing performance of a fitting portion with an outer member . and to provide a sensor cap, and a manufacturing method of the rotational speed detector equipped wheel support bearing assembly and sensor cap for rotation speed detector equipped wheel support bearing assembly having the same.

In order to achieve such an object, the invention according to claim 1 of the present invention includes a bottomed cylindrical cap body formed by injection molding a synthetic resin, and a core bar integrally molded in an opening of the cap body. A rotational speed in which a mounting portion that protrudes in the axial direction is integrally formed on the radially outer portion of the cap body, and an insertion hole that extends in the axial direction and in which the sensor unit is mounted is formed in the mounting portion. In a sensor cap for a wheel bearing device with a detection device, the radius is a portion protruding in the axial direction of the cap body and the center of the cap body and the center of the insertion hole spaced from the center. Inside the circle, the position of the gate is set on a straight line passing through the center of the cap body and the center of the insertion hole .

Thus, it comprises a bottomed cylindrical cap body formed by injection molding of a synthetic resin and a cored bar integrally molded in the opening of the cap body, and is axially formed on the radially outer portion of the cap body. In a sensor cap for a wheel bearing device with a rotational speed detecting device in which a protruding mounting portion is integrally formed, extends in the axial direction to the mounting portion, and has an insertion hole for mounting a sensor unit, the shaft of the cap body A straight line that passes through the center of the cap body and the center of the insertion hole inside a circle having a radius extending from the center to the center of the insertion hole that is spaced apart from the center of the cap body. since the position of the gate is set on, via injection port formed integrally with the die body, it can be prevented from interfering with the mounting portion of the sensor cap, molten synthetic resin mounting portion It never flows smoothly, resulting in a large time difference fast flowing radially Te. Therefore, it is possible to ensure the desired roundness while preventing the occurrence of sink marks and the like, improving the accuracy of the sensor cap, and detecting the rotational speed that ensures the tightness of the fitting portion with the outer member. A sensor cap for a wheel bearing device with a device can be provided.

Further, as in the invention described in claim 2 , if a projection is formed continuously in the radial direction on the mounting portion of the cap body, and the position of the gate is set on the projection, The position of the gate can be set so that the molten synthetic resin flows smoothly in the radial direction and the flow speed is substantially uniform without being affected by the shape and size.

Further, as in the invention described in claim 3 , the end surface of the protruding portion may be formed slightly lower than the end surface of the mounting portion. Further, as in the invention described in claim 4 , the end surface of the protruding portion may be formed slightly higher than the end surface of the mounting portion. Further, as in the invention described in claim 5 , the end surface of the projection and the end surface of the attachment portion may be formed flush with each other.

Further, as in the invention described in claim 6 , if the width dimension of the protrusion is formed smaller than the width dimension of the attachment part, it is possible to reduce the material cost and reduce the weight.

The invention according to claim 7 of the present invention is such that an outer member in which a double row outer rolling surface is integrally formed on the inner periphery and a wheel mounting flange for mounting a wheel on one end are integrated. A hub ring 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, and facing the outer surface of the double row on the outer periphery. An inner member in which a double-row inner rolling surface is formed, a double-row rolling element housed between the inner member and the outer member so as to roll freely, and the inner ring And the pulsar ring whose characteristics are alternately changed at equal intervals in the circumferential direction, and the inner end of the outer member of the wheel bearing device is fixed by inner fitting, and a synthetic resin is injection-molded. A bottomed cylindrical sensor cap, and the outside of the sensor cap in the radial direction The mounting portion is formed so as to protrude in the axial direction, an insertion hole extending in the axial direction is formed in the mounting portion, a sensor unit is mounted in the insertion hole, and the rotational speed sensor embedded in the sensor unit Is a sensor cap according to any one of claims 1 to 6 , wherein the sensor cap is opposed to the pulsar ring via a predetermined axial air gap.

In this way, it is externally fitted to the inner ring, the pulsar ring whose characteristics are alternately changed at equal intervals in the circumferential direction, and the inner part is fixed to the inner side end of the outer member, and the synthetic resin is injection-molded. An insertion hole extending in the axial direction at a position corresponding to the pulsar ring of the mounting portion. For a wheel with a rotational speed detecting device in which a sensor unit is mounted in the insertion hole, and a rotational speed sensor embedded in the sensor unit is opposed to a pulsar ring via a predetermined axial air gap in the bearing device, the sensor cap is either sensor cap claims 1 to 6, injection port formed integrally with the die body, interfering in the mounting portion of the sensor cap Can be prevented, molten synthetic resin by way of the mounting portion flows smoothly in the radial direction, it does not occur a large time difference in the speed of flow. Therefore, it is possible to ensure the desired roundness while preventing the occurrence of sink marks and the like, improving the accuracy of the sensor cap, and detecting the rotational speed that ensures the tightness of the fitting portion with the outer member. A wheel bearing device with a device can be provided.

Preferably, as in the invention according to claim 8 , the sensor unit integrally includes an insertion portion in which the rotational speed sensor is embedded and a mounting flange fixed to the mounting portion of the sensor cap. If the nut is embedded in the mounting portion by insert molding, and the sensor holder is detachably fixed to the mounting portion via a fixing bolt, the sensor unit can be reliably displaced without being displaced for a long period of time. Can be fixed.

According to a ninth aspect of the present invention, the sensor cap includes a bottomed cylindrical cap main body formed by injection molding a synthetic resin, and a core bar integrally molded in the opening of the cap main body. If the core bar is exposed to the outer periphery of the cap body and is press-fitted into the inner periphery of the end of the outer member, the strength and rigidity of the sensor cap can be increased, and the fitting is performed by metal fitting. The sealing performance of the part can be improved.

Further, as in the invention described in claim 10 , when the core metal is formed by press working from a non-magnetic steel plate, highly accurate speed detection can be performed without adversely affecting the sensing performance of the rotational speed sensor. It can be carried out.

The method invention according to claim 11 of the present invention comprises a bottomed cylindrical cap body formed by injection molding a synthetic resin, and a core bar integrally molded in the opening of the cap body. A wheel with a rotational speed detection device in which a mounting portion that protrudes in the axial direction is integrally formed on the radially outer portion of the cap body, and an insertion hole that extends in the axial direction and in which the sensor unit is mounted is formed in the mounting portion. In a method for manufacturing a sensor cap for a bearing device for a vehicle, a circle having a radius extending from the center of the cap body to a center of the insertion hole that is spaced apart from the center of the cap body. in the inner, the straight line to the gate position passing through the centers of said insertion holes of the cap body is configured to inject a synthetic resin which is melted in the mold body from the gate, the synthetic resin is the Flows radially are filled into the mold via the attachment portions.

Thus, it comprises a bottomed cylindrical cap body formed by injection molding of a synthetic resin and a cored bar integrally molded in the opening of the cap body, and is axially formed on the radially outer portion of the cap body. In the method of manufacturing a sensor cap for a wheel bearing device with a rotational speed detection device in which a protruding mounting portion is integrally formed, extends in the axial direction to the mounting portion, and has an insertion hole for mounting a sensor unit, the cap The position of the gate is set inside the circle projecting in the axial direction of the main body and having a radius from the center of the cap body to the center of the insertion hole spaced from the center. The molten synthetic resin is poured into the mold, and the synthetic resin flows in the radial direction via the mounting portion and fills the mold. Therefore, the injection port formed integrally with the mold body is attached to the cap body. Part It is possible to prevent interference, and the molten synthetic resin flows smoothly in the radial direction via the mounting part, and does not cause a large time difference in the flow speed, while preventing the occurrence of sink marks, etc. The roundness of can be secured.

A sensor cap for a wheel bearing device with a rotational speed detection device according to the present invention includes a bottomed cylindrical cap body formed by injection molding a synthetic resin, and a core bar integrally molded in an opening of the cap body. Rotational speed detection in which a mounting portion that protrudes in the axial direction is integrally formed on the radially outer portion of the cap body, and an insertion hole is formed in the mounting portion that extends in the axial direction to mount the sensor unit. In a sensor cap for a wheel bearing device with a device, a circle having a radius extending from the center of the cap body to the center of the insertion hole spaced apart from the center of the cap body in the sensor cap. in the inner, since the center and a straight line to the gate position passing through the center of the insertion hole of the cap body is set, injection port formed integrally with the die body, the sensor cap Of it can be prevented from interfering with the mounting portion, molten synthetic resin by way of the mounting portion flows smoothly in the radial direction, never cause large time difference fast flowing. Therefore, it is possible to ensure the desired roundness while preventing the occurrence of sink marks and the like, improving the accuracy of the sensor cap, and detecting the rotational speed that ensures the tightness of the fitting portion with the outer member. A sensor cap for a wheel bearing device with a device can be provided.

Further, the wheel bearing device with a rotational speed detection device according to the present invention includes an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and a wheel mounting flange for mounting the wheel at 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 inner member and the outer member. A pulsar ring that is externally fitted to the inner ring and whose characteristics are alternately changed at equal intervals in the circumferential direction, and is fitted and fixed to the inner side end of the outer member of the wheel bearing device. A bottomed cylindrical sensor cap formed by injection molding. A mounting portion is formed on the radially outer portion of the socket so as to protrude in the axial direction. An insertion hole extending in the axial direction is formed in the mounting portion, and a sensor unit is mounted in the insertion hole. 7. A wheel bearing device with a rotational speed detection device in which a buried rotational speed sensor is opposed to the pulsar ring via a predetermined axial air gap, wherein the sensor cap is the sensor cap according to any one of claims 1 to 6. Therefore, it is possible to prevent the injection port formed integrally with the mold body from interfering with the mounting portion of the sensor cap, and the molten synthetic resin smoothly flows in the radial direction through the mounting portion, and the flow speed. There will be no significant time difference. Therefore, it is possible to ensure the desired roundness while preventing the occurrence of sink marks and the like, improving the accuracy of the sensor cap, and detecting the rotational speed that ensures the tightness of the fitting portion with the outer member. A wheel bearing device with a device can be provided.

A method for manufacturing a sensor cap for a wheel bearing device with a rotational speed detection device according to the present invention comprises a bottomed cylindrical cap body formed by injection molding of a synthetic resin, and an opening in the cap body. The cap body is integrally formed with an axially projecting mounting portion at the radially outer portion of the cap body, and the mounting portion extends in the axial direction and has an insertion hole for mounting the sensor unit. In the method of manufacturing a formed sensor cap for a wheel bearing device with a rotational speed detection device, the insertion is a portion protruding in the axial direction of the cap body and spaced apart from the center of the cap body. the distance from the center hole on the inside of a circle radius, the straight line to the gate position passing through the centers of said insertion holes of the cap body is configured to melt from the gate to the mold body Since the synthetic resin is injected, and the synthetic resin flows in the radial direction via the mounting portion and is filled in the mold, the injection port formed integrally with the mold main body is attached to the cap main body mounting portion. The molten synthetic resin flows smoothly in the radial direction via the mounting portion, and does not cause a large time difference in the flow speed, while preventing the occurrence of sink marks, A desired roundness can be ensured.

It is a longitudinal cross-sectional view which shows one Embodiment of the wheel bearing apparatus with a rotational speed detection apparatus which concerns on this invention. It is a principal part enlarged view of FIG. (A) is the longitudinal cross-section which shows the sensor cap single-piece | unit of FIG. 1, (b) is a side view of (a). (A) is the longitudinal cross-section which shows the modification of the sensor cap single-piece | unit of FIG. 3, (b) is a side view of (a). (A) is the longitudinal cross-section which shows the other modification of the sensor cap single-piece | unit of FIG. 3, (b) is a side view of (a). (A) is the longitudinal cross-section which shows the other modification of the sensor cap single-piece | unit of FIG. 3, (b) is a side view of (a). (A) is the longitudinal cross-section which shows the other modification of the sensor cap single-piece | unit of FIG. 3, (b) is a side view of (a). It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus with a rotational speed detection apparatus. It is a principal part enlarged view of FIG. (A) is a longitudinal cross-sectional view which shows the sensor cap single-piece | unit of FIG. 8, (b) is a side view of (a).

  An outer member integrally having a vehicle body mounting flange to be attached to the vehicle body 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 an inner rolling surface facing one of the outer rolling surfaces of the double row on the outer periphery, and a small-diameter step portion extending in the axial direction from the inner rolling surface, and the hub wheel An inner member formed of an inner ring that is press-fitted into a small-diameter step portion and formed with an inner rolling surface facing the other of the double row outer rolling surfaces, and the inner member and the outer member. A double-row rolling element accommodated between the running surfaces so as to be freely rollable, a pulsar ring that is externally fitted to the inner ring and whose characteristics are alternately changed at equal intervals in the circumferential direction, and an inner member of the outer member And a sensor cap that is fitted and fixed to the end of the side. It consists of a bottomed cylindrical cap body formed by injection molding a synthetic resin and a cored bar integrally molded in the opening of the cap body, and the mounting portion is axially outward of the cap body in the radial direction. An insertion hole extending in the axial direction is formed at a position corresponding to the pulsar ring of the mounting portion, and a sensor unit is mounted in the insertion hole, and a rotation speed sensor embedded in the sensor unit is formed. In the wheel bearing device with a rotation speed detection device opposed to the pulsar ring via a predetermined axial air gap, the sensor unit includes an insertion portion in which the rotation speed sensor is embedded and an attachment portion of the cap body A sensor holder integrally having a mounting flange fixed to the nut, and a nut is embedded in the mounting portion by insert molding, With knit is detachably fixed via a fixing bolt to the mounting portion, the position of the gate is set to substantially the center of the sensor cap of the mounting portion.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a longitudinal sectional view showing an embodiment of a wheel bearing device with a rotational speed detection device according to the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 (a) is a sensor of FIG. The longitudinal section which shows a cap simple substance, (b) is a side view of (a), and Drawing 4 thru / or Drawing 7 show the modification of Drawing 3. 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 with a rotational speed detection device is called the third generation on the driven wheel side, and the hub wheel 1 and the double row rolling bearing 2 are configured as a unit. The double row rolling bearing 2 includes an inner member 3, an outer member 4, and double row rolling elements (balls) 5, 5 accommodated between the members 3, 4 so as to be freely rollable. The inner member 3 indicates a hub wheel 1 and an inner ring 7 that is press-fitted and fixed to the hub wheel 1.

  The hub wheel 1 integrally has a wheel mounting flange 6 for mounting a wheel (not shown) at an end portion on the outer side, and the wheel mounting flange 6 is used for fastening a wheel at a circumferentially equidistant position. Hub bolt 6a is planted. In addition, an outer side (one) inner rolling surface 1a and an axial small-diameter step portion 1b extending in the axial direction from the inner rolling surface 1a are formed on the outer periphery, and an inner ring 7 is connected to the small-diameter step portion 1b. It is press-fitted through shimeshiro. Then, the end portion of the small-diameter step portion 1b is plastically deformed radially outward to form a caulking portion 1c, and the inner ring 7 is given a predetermined bearing preload to the hub wheel 1 by the caulking portion 1c. It is fixed in the axial direction in the state. An inner side inner rolling surface 7 a is formed on the outer periphery of the inner ring 7.

  On the other hand, the outer member 4 integrally has a vehicle body mounting flange 4b fixed to a knuckle (not shown) constituting a suspension device on the outer periphery, and double row inner rolling of the inner member 3 on the inner periphery. Double row outer rolling surfaces 4a and 4a facing the surfaces 1a and 7a are integrally formed. The double row rolling bearing 2 includes double row rolling elements 5 and 5 accommodated between the rolling surfaces 4a, 1a and 4a and 7a, and the double row rolling elements 5 and 5 are equally arranged in the circumferential direction. And a cage 8 that holds the roll freely.

  Seals 9 and sensor caps 10 are attached to both ends of the outer member 4 to seal the opening of the annular space formed between the outer member 4 and the inner member 3. The seal 9 and the sensor cap 10 prevent leakage of the lubricating grease sealed inside the bearing and intrusion of rainwater, dust and the like from the outside into the bearing.

  The hub wheel 1 is made of medium and high carbon steel containing carbon of 0.40 to 0.80 wt% such as S53C, and includes an inner raceway surface 1a and a base portion on the inner side of the wheel mounting flange 6 that serves as a seal land portion of the seal 9. The surface hardness is hardened in the range of 58 to 64 HRC by induction hardening from 6b to the small diameter step 1b. The caulking portion 1c is an unquenched portion having a surface hardness of 30 HRC or less after forging.

  Further, the outer member 4 is formed of medium and high carbon steel containing carbon of 0.40 to 0.80 wt% such as S53C, similar to the hub wheel 1, and at least the double row outer raceway surfaces 4a and 4a are formed by induction hardening. The surface hardness is set in the range of 58 to 64 HRC. On the other hand, the inner ring 7 and the rolling element 5 are made of high carbon chrome bearing steel such as SUJ2, and are hardened in the range of 58 to 64 HRC up to the core part by quenching. Here, as the double row rolling bearing 2, a double row angular contact ball bearing using the rolling elements 5, 5 as a ball is illustrated, but not limited to this, a double row tapered roller bearing using a tapered roller as the rolling element. There may be. Further, although the third generation structure has been illustrated, a so-called second generation structure in which a pair of inner rings are press-fitted into the hub ring may be used.

  A pulsar ring 11 is press-fitted into the outer periphery of the inner ring 7. The pulsar ring 11 includes a support ring 12 formed in an annular shape, and a magnetic encoder 13 integrally joined to the side surface of the support ring 12 by vulcanization adhesion or the like. This magnetic encoder 13 constitutes a rotary encoder for detecting the rotational speed of a wheel by mixing magnetic powder such as ferrite in an elastomer such as rubber and alternately magnetizing magnetic poles N and S in the circumferential direction.

The support ring 12 is made of a ferromagnetic steel plate , for example, a ferritic stainless steel plate (JIS standard SUS430 system or the like) or a rust-proof cold rolled steel sheet (JIS standard SPCC system or the like) by press working. It has a cylindrical portion 12a that is formed in a letter shape and is press-fitted into the inner ring 7, and a standing plate portion 12b that extends radially inward from the cylindrical portion 12a. The magnetic encoder 13 is joined to the side surface on the inner side of the upright plate portion 12b.

The sensor cap 10 is fitted and fixed to the inner end of the outer member 4 and closes the opening of the outer member 4. The sensor cap 10 includes a bottomed cylindrical cap body 14 formed by injection molding a synthetic resin, and a core 15 integrally molded in an opening of the cap body 14. The core 15 is formed in an annular shape having an L-shaped cross section by press forming a stainless steel plate having corrosion resistance. In particular, the core 15 is formed of a non-magnetic steel plate , for example, an austenitic stainless steel plate (JIS standard SUS304 or the like) so as not to adversely affect the sensing performance of the rotational speed sensor 19 described later. Is preferred. The sealing performance can be improved by fitting the outer peripheral portion 4 with the outer peripheral portion made of a resin having elasticity of the cap main body 14.

  Here, as shown in an enlarged view in FIG. 2, a mounting portion 16 that protrudes in the axial direction is integrally provided on the radially outer portion of the cap body 14, and corresponds to the magnetic encoder 13 of the mounting portion 16. An insertion hole 16a penetrating in the axial direction is formed at the position. The sensor unit 17 is inserted through the O-ring 18 into the insertion hole 16a.

  The sensor unit 17 includes a rotation speed sensor 19 composed of a magnetic detection element whose characteristics are changed according to the flow direction of magnetic flux, such as a Hall element, a magnetoresistive element (MR element), and a waveform shaping circuit for adjusting the output waveform of the magnetic detection element. It is composed of an IC or the like in which an automobile is incorporated, and constitutes an anti-lock brake system for an automobile that detects the rotational speed of the wheel and controls its rotational speed.

  The rotation speed sensor 19 is embedded in a sensor holder 20 made of synthetic resin. The sensor holder 20 is integrally formed with an insertion portion 20a and a mounting flange 20b. Further, a nut 21 having an internal thread 21a formed on the inner periphery is embedded in the mounting portion 16 of the cap body 14 by insert molding. The sensor unit 17 is fixed to the mounting portion 16 by fastening the fixing bolt 22 via the mounting flange 20b. An annular groove 21b is formed on the outer periphery of the nut 21 to prevent the nut 21 from moving in the axial direction.

  Here, in the present embodiment, as shown in FIG. 3, the position of the gate 25 is set between the insertion hole 16 a of the attachment portion 16 of the cap body 14 and the nut 21. As a result, the injection port formed integrally with the mold main body can be prevented from interfering with the mounting portion 16 of the cap main body 14, and the molten synthetic resin can be removed as shown by an arrow in FIG. It smoothly flows in the radial direction via the mounting portion 16 and does not cause a large time difference in the flowing speed. Therefore, the rotation that can ensure the desired roundness while preventing the occurrence of sink marks and the like, improves the accuracy of the sensor cap 10, and ensures the sealing performance of the fitting portion with the outer member 4. A wheel bearing device with a speed detection device can be provided.

  FIG. 4 shows a modification of FIG. In this embodiment, only the position of the gate is basically different from that described above, and the same parts are denoted by the same reference numerals, and detailed description is omitted.

  In this embodiment, the position of the gate 25 is set at the approximate center of the cap body 14 'in the vicinity of the nut 21 of the mounting portion 16' of the cap body 14 '. As a result, the injection port formed integrally with the mold body can be prevented from interfering with the mounting portion 16 ′ of the cap body 14 ′, and as shown by the arrow in FIG. The resin smoothly flows in the radial direction via the mounting portion 16 ′, the flow speed becomes substantially uniform, the occurrence of sink marks and the like is prevented, and the desired roundness is secured to ensure the sensor cap 10. 'Can improve the accuracy.

  FIG. 5 shows another modification of FIG. This embodiment basically differs from the above-described embodiment only in part of the shape of the mounting portion, and other parts having the same parts or the same functions as those of the above-described embodiments are denoted by the same reference numerals. Detailed description thereof will be omitted.

  A mounting portion 27 protruding in the axial direction is integrally provided on the radially outer portion of the cap body 26, and a protruding portion 28 is formed continuously with the mounting portion 27. The end face of the protrusion 28 is formed slightly lower than the end face of the mounting portion 27, and the position of the gate 25 is set on the protrusion 28. Thereby, the injection port formed integrally with the mold body can be prevented from interfering with the mounting portion 27 of the cap body 26, and the molten synthetic resin is not affected by the shape and size of the mounting portion 27. The position of the gate 25 can be set so that it flows smoothly in the radial direction and the flow speed is substantially uniform. Furthermore, since the end surface of the projection part 28 is formed lower than the end surface of the attachment part 27, material cost reduction and weight reduction can be achieved.

  In the present embodiment, the width dimension W2 of the protrusion 28 is smaller than the width dimension W1 of the mounting part 27 (W1> W2). Thereby, material cost reduction and weight reduction can be achieved.

  FIG. 6 shows another modification of FIG. This embodiment basically differs from the above-described embodiment only in part of the shape of the mounting portion, and other parts having the same parts or the same functions as those of the above-described embodiments are denoted by the same reference numerals. Detailed description thereof will be omitted.

  A mounting portion 30 protruding in the axial direction is integrally provided on the radially outer portion of the cap body 29, and a protruding portion 31 is formed continuously with the mounting portion 30. The end surface of the protrusion 31 is formed slightly higher than the end surface of the mounting portion 30, and the position of the gate 25 is set in the protrusion 31. As a result, as in the above-described embodiment, the injection port formed integrally with the mold main body can be prevented from interfering with the mounting portion 30 of the cap main body 29, and is affected by the shape and size of the mounting portion 30. Instead, the position of the gate 25 can be set so that the molten synthetic resin flows smoothly in the radial direction and the flow speed becomes substantially uniform. Furthermore, since the end surface of the protrusion 28 is formed slightly higher than the end surface of the mounting portion 27, it is possible to prevent the injection port from interfering with various sensor mounting portion shapes.

  FIG. 7 shows another modification of FIG. This embodiment basically differs from the above-described embodiment only in part of the shape of the mounting portion, and other parts having the same parts or the same functions as those of the above-described embodiments are denoted by the same reference numerals. Detailed description thereof will be omitted.

  A mounting portion 33 protruding in the axial direction is integrally provided on the radially outer portion of the cap body 32, and a protruding portion 34 is formed continuously with the mounting portion 33. The end face of the protrusion 34 is formed substantially flush with the end face of the mounting portion 33, and the position of the gate 25 is set at the protrusion 34. As a result, as in the above-described embodiment, the injection port formed integrally with the mold body can be prevented from interfering with the mounting portion 33 of the cap body 32, and the shape and size of the mounting portion 33 are affected. Instead, the position of the gate 25 can be set so that the molten synthetic resin flows smoothly in the radial direction and the flow speed becomes substantially uniform. Furthermore, since the end surface of the protrusion 28 and the end surface of the mounting portion 27 are formed substantially flush with each other, the mold can be easily manufactured.

  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.

  The wheel bearing device with a rotation speed detection device according to the present invention can be applied to a wheel bearing device in which a cap body made of a synthetic resin is fitted to an outer member.

DESCRIPTION OF SYMBOLS 1 Hub wheel 1a, 7a Inner rolling surface 1b Small diameter step part 1c Clamping part 2 Double row rolling bearing 3 Inner member 4 Outer member 4a Outer rolling surface 4b Car body mounting flange 5 Rolling element 6 Wheel mounting flange 6a Hub bolt 6b Base portion on inner side of wheel mounting flange 7 Inner ring 8 Cage 9 Seal 10, 10 'Sensor cap 11 Pulsar ring 12 Support ring 12a Cylindrical portion 12b Standing plate portion 13 Magnetic encoder 14, 14', 26, 29, 32 Cap body 15 Core 16, 16 ′, 27, 30, 33 Mounting portion 16 a Insertion hole 17 Sensor unit 18 O-ring 19 Rotational speed sensor 20 Sensor holder 20 a Insertion portion 20 b Mounting flange 21 Nut 21 a Female thread 21 b Annular groove 22 Fixing bolt 25 Gate 28, 31, 34 Protruding portion 51 Outer member 51a Outer rolling surface 51b Car body mounting flange 52 Directional member 53 Ball 54 Wheel mounting flange 55 Hub wheels 55a, 56a Inner rolling surface 55b Small diameter step portion 56 Inner ring 57 Cage 58 Clamping portion 59 Seal 60 Magnetic encoder 61 Support ring 62 Encoder body 63 Sensor cap 64 Cap body 65 Metal Ring 66 Projection 67 Insertion hole 68, 74 Sleeve 69 Sensor 70 O-ring 71 Magnetic detection element 72 Attachment piece 73 Bolt insertion hole 75 Sensor fixing bolt 76 Insert nut 77 Gate W1 Attachment width W2 Protrusion width

Claims (11)

A bottomed cylindrical cap body formed by injection molding a synthetic resin;
Consists of a cored bar integrally molded in the opening of this cap body,
A mounting portion protruding in the axial direction is integrally formed on the radially outer portion of the cap body,
In the sensor cap for a wheel bearing device with a rotational speed detection device that extends in the axial direction to the mounting portion and has an insertion hole in which the sensor unit is mounted,
A portion protruding in the axial direction of the cap body and inside the circle having a radius from the center of the cap body to the center of the insertion hole separated from the center of the cap body and the insertion of the cap body A sensor cap for a wheel bearing device with a rotational speed detection device, wherein the position of the gate is set on a straight line passing through the center of the hole . The protrusion is continuously in the radial direction to the mounting portion of the cap body is formed, the rotational speed detector equipped wheel support bearing assembly for the sensor cap according to claim 1, the position of the gate is set to the protrusion . The sensor cap for a wheel bearing device with a rotational speed detection device according to claim 2 , wherein an end surface of the protrusion is formed slightly lower than an end surface of the mounting portion. The sensor cap for a bearing device for a wheel with a rotational speed detection device according to claim 2 , wherein an end surface of the protruding portion is formed slightly higher than an end surface of the mounting portion. The sensor cap for a bearing device for a wheel with a rotational speed detection device according to claim 2 , wherein an end surface of the protruding portion and an end surface of the mounting portion are flush with each other. The sensor cap for a bearing device for a wheel with a rotation speed detection device according to any one of claims 2 to 5, wherein a width dimension of the protrusion is formed smaller than a width dimension of the mounting portion. An outer member in which a double row outer rolling surface is integrally formed on the inner periphery;
From a hub wheel integrally having a wheel mounting flange for mounting a wheel at one end 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 movably between the rolling surfaces of the inner member and the outer member;
Pulsar ring that is externally fitted to the inner ring, and the characteristics are changed alternately and at equal intervals in the circumferential direction;
A bottomed cylindrical sensor cap that is fitted and fixed to the inner side end of the outer member of the wheel bearing device, and is formed by injection molding a synthetic resin.
A mounting portion is formed to protrude in the axial direction on the radially outer portion of the sensor cap, and an insertion hole extending in the axial direction is formed in the mounting portion.
In the wheel bearing device with a rotational speed detection device, wherein a sensor unit is mounted in the insertion hole, and the rotational speed sensor embedded in the sensor unit is opposed to the pulsar ring via a predetermined axial air gap.
A wheel bearing device with a rotational speed detection device, wherein the sensor cap is a sensor cap according to any one of claims 1 to 6 . The sensor unit includes a sensor holder integrally including an insertion portion in which the rotational speed sensor is embedded and a mounting flange fixed to the mounting portion of the sensor cap, and a nut is embedded in the mounting portion by insert molding. The wheel bearing device with a rotational speed detection device according to claim 7 , wherein the sensor holder is detachably fixed to the attachment portion via a fixing bolt. The sensor cap comprises a bottomed cylindrical cap body formed by injection molding a synthetic resin, and a core metal integrally molded in the opening of the cap body, and the core metal is formed on the outer periphery of the cap body. The wheel bearing device with a rotational speed detection device according to claim 7 , wherein the wheel bearing device is exposed and press-fitted into an inner periphery of an end portion of the outer member. The wheel bearing device with a rotation speed detection device according to claim 9 , wherein the core metal is formed by pressing from a non-magnetic steel plate. A bottomed cylindrical cap body formed by injection molding a synthetic resin;
Consists of a cored bar integrally molded in the opening of this cap body,
A mounting portion protruding in the axial direction is integrally formed on the radially outer portion of the cap body,
In the method of manufacturing a sensor cap for a wheel bearing device with a rotation speed detection device in which an insertion hole for mounting the sensor unit is formed extending in the axial direction to the mounting portion.
A portion protruding in the axial direction of the cap body and inside the circle having a radius from the center of the cap body to the center of the insertion hole separated from the center of the cap body and the insertion of the cap body The position of the gate is set on a straight line passing through the center of the hole, and a molten synthetic resin is injected from the gate into the mold body, and the synthetic resin flows in a radial direction through the mounting portion, and the mold A method for producing a sensor cap for a wheel bearing device with a rotational speed detecting device, wherein the sensor cap is filled in the inside.

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