JP2006177479A - Hub unit with sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hub unit with a sensor capable of attaching a sensor for determining tire grounding load without additional work. <P>SOLUTION: A sensor device 2 includes an annular core metal 7 fitted in an axially inner-side end portion of a fixed side raceway member 3, a sensor fixing resin 8 integrally formed with the core metal 7, one wheel speed detecting sensor 9 and at least one displacement sensor 11. The sensor fixing resin 8 comprises a disk section 8a having an outer diameter substantially equal to that of the core metal 7, an annular projecting section 8b provided at the outer peripheral edge of the disk section 8a and a column-shaped protrusion 8c arranged at the central portion of the disk section 8a. The wheel speed detecting sensor 9 is fixed to the annular projecting section 8b of the sensor fixing resin 8, and the displacement sensor 11 is fixed to the column-shaped protrusion 8c. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sensor-equipped hub unit in which a hub unit constituting an automobile and a sensor device for detecting various information of the automobile are integrated.

In recent years, in addition to ABS control (anti-lock brake system), driving force control that does not spin the driving wheel when starting or accelerating, and braking force control that suppresses side slip during cornering have been implemented as a vehicle control means. However, in order to perform more accurate control, it is important to detect data that can be used effectively for these controls. Therefore, in Patent Document 1, a displacement sensor is provided in a hub unit having a fixed-side track member fixed to the vehicle body side, a rotation-side track member to which a wheel is attached, and two rows of rolling elements disposed between the two members. It is proposed that the ground load applied to the tire (wheel) is obtained to improve vehicle control.
Japanese Patent Laid-Open No. 2003-336652

  In the hub unit with a sensor of the above-mentioned patent document 1, processing for attaching a displacement sensor and addition of a member for supporting the sensor are necessary, and there is a problem that costs increase.

  An object of the present invention is to provide a sensor-equipped hub unit to which a sensor for obtaining a tire ground contact load can be attached without extra processing.

  A hub unit with a sensor according to the present invention includes a fixed-side track member fixed to a vehicle body side, a rotation-side track member having a wheel mounting flange portion, and a hub unit having a rolling element disposed between both track members; In the sensor-equipped hub unit including the sensor device, the sensor device includes an annular cored bar fitted into the axially inner end of the fixed-side raceway member, a sensor fixing resin integrally formed with the cored bar, It has one wheel speed detection sensor and at least one displacement sensor, and the sensor fixing resin has a disk portion having an outer diameter substantially equal to the outer diameter of the core metal, and an outer peripheral edge portion of the disk portion. It is composed of an annular protrusion provided and a columnar protrusion provided at the center of the disc part, and a wheel speed detection sensor is fixed to the annular protrusion, and each displacement sensor is connected to the columnar protrusion. But And it is characterized in that it is a constant.

  The wheel speed detection sensor is a Hall element sensor, a magnetoresistive element sensor, an electromagnetic induction type sensor, or the like, and the rotation-side track member is provided with pulsar ring provided with slits at predetermined intervals or S poles and N poles alternately. The mounted pulsar ring is attached to face the sensor.

  The displacement sensor is, for example, a magnetic impedance sensor. Although the number of installation positions of the displacement sensor may be one, it is preferable that the number of displacement sensors is at least three in order to obtain the three-way component force of the tire ground contact load.

  The sensor fixing resin is formed in an annular shape having an outer diameter substantially equal to the outer diameter of the metal core if the wheel speed detection sensor is only fixed, and the wheel speed detection sensor is fixed to the outer portion in the axial direction. The sensor fixing resin is provided at the disc portion having an outer diameter substantially equal to the outer diameter of the metal core, the annular protrusion provided at the outer peripheral edge of the disc portion, and the central portion of the disc portion. Sensor fixing resin in which the wheel speed detection sensor is fixed by fixing the wheel speed detection sensor to the annular protrusion and each displacement sensor to the cylindrical protrusion. In addition, a sensor device in which the displacement sensor is further fixed is obtained.

  The rotation-side raceway member includes an inner shaft having a large diameter portion having a raceway groove and a small diameter portion having an outer diameter smaller than the diameter of the raceway groove, and an inner ring fitted to the outer diameter of the small diameter portion of the inner shaft, The inner ring is fixed to the inner shaft by caulking the annular inner ring fixing caulking portion provided on the inner end surface in the axial direction of the small diameter portion of the inner shaft radially outward, and the sensor fixing resin circle It is preferable that the tip of the columnar protruding portion is positioned inside the inner ring fixing caulking portion so that each displacement sensor faces the axially inner end surface of the small diameter portion or the inner peripheral surface of the inner ring fixing caulking portion. . In this way, by performing caulking to fix the inner ring to the inner shaft, a surface to be detected necessary for the displacement sensor is formed, and processing other than this caulking is not required, and thus further cost reduction is possible. Become.

  The ground load applied to the tire fluctuates in accordance with the speed change and posture change of the traveling vehicle, and the position of the rotating side race member with respect to the fixed side race member changes according to the tire ground load change. This change in position can be detected, for example, by installing displacement sensors at a total of four locations at the top, bottom, front, and rear, and the load acting on the tire can be determined from the output of each sensor.

  The displacement sensors are arranged, for example, at a total of 8 locations, and these are lift / sink detection sensors that face the top and bottom of the inner peripheral surface of the inner ring fixing caulking part and detect the car's float / sink state. A braking / acceleration detection sensor for detecting the braking / acceleration state of the vehicle facing the front and rear of the inner peripheral surface of the inner ring fixing caulking portion, and the top and bottom of the axially inner end surface of the small diameter portion The turning detection sensor that detects the turning state and the turning detection sensor that faces the front and rear portions of the axially inner end surface of the small diameter portion and detects the turning state may be used. If it does in this way, various data required for vehicle control can be acquired from one sensor device. Prioritize the lift / sink detection sensor, braking / acceleration detection sensor, turning detection sensor, and steering detection sensor.For example, if the detection of the steering state is not important, omit the steering detection sensor. Of course it is good.

  According to the hub unit with a sensor of the present invention, since the displacement sensor is further fixed to the sensor fixing resin which is integrally formed on the metal core and to which the wheel speed detection sensor is fixed, it is located away from the wheel speed detection sensor. Compared with the case where the displacement sensor is separately arranged, the processing for the hub unit for attaching the displacement sensor and the separate member for supporting the displacement sensor are not required, and the cost can be reduced.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows an embodiment of a sensor-equipped hub unit according to the present invention. In the following description, the left and right refer to the left and right in FIG. Note that the left is inside the vehicle and the right is outside the vehicle.

  This sensor-equipped hub unit includes a hub unit (1) and a sensor device (2) for detecting the rotation and tire ground contact load.

  The hub unit (1) is arranged in two rows between the fixed side track member (3) fixed to the vehicle body side, the rotary side track member (4) to which the wheel is attached, and both members (3) and (4). A ball (5), which is a plurality of rolling elements, and a cage (6) for holding each row of balls (5) are provided.

  The fixed-side track member (3) is provided near the left end of the cylindrical portion (12) with two rows of outer ring raceways formed on the inner peripheral surface, and bolts are attached to the suspension device (vehicle body). And a flange portion (13) to be attached.

  The rotation side raceway member (4) has a large diameter portion (15) having a first raceway groove (15a) and a small diameter portion (16) having an outer diameter smaller than the diameter of the first raceway groove (15a). The inner ring (14), and the inner ring (14), the inner ring (14), which has a small diameter part (16) and is fitted to the outer diameter, and the right side is in close contact with the left side of the large diameter part (15) of the inner axis (14) (17) Near the right end of the inner shaft (14), a flange portion (18) to which a plurality of bolts (19) for attaching a wheel is fixed is provided. A raceway groove (17a) is formed on the right side of the inner ring (17) so as to be parallel to the raceway groove (15a) of the inner shaft (14). A sealing device (20) is provided between the right end portion of the fixed-side track member (3) and the inner shaft (14).

  An annular inner ring fixing caulking portion (21) is provided on the left end surface (axial inner end surface) (16a) of the small diameter portion (16) of the inner shaft (14), and this inner ring fixing caulking portion (21 The inner ring (17) is fixed to the inner shaft (14) by pressing the inner ring (17) to the right (axially outward) by caulking the left end of) radially outward.

  The sensor device (2) includes an annular cored bar (7) fitted to the inner diameter of the left end (axially inner end) of the fixed side raceway member (3), and a sensor fixed integrally formed on the cored bar (7) Resin (8), one wheel speed detection sensor (9), and a pulsar ring (10) fixed to the inner ring (17) of the rotation side raceway member (4) so as to face the wheel speed detection sensor (9) And a total of eight displacement sensors (11) and processing means (not shown) for processing the outputs of the sensors (9) and (11).

  The sensor fixing resin (8) is provided on the outer peripheral edge of the disc portion (8a) and the disc portion (8a) having an outer diameter substantially equal to the outer diameter of the core metal (7). And an annular protrusion (8b), and a columnar protrusion (8c) provided in the center of the disc part (8a) so as to protrude rightward. The annular protrusion (8b) is formed so that its outer peripheral surface is located with a slight gap radially inward of the pulsar ring (10), and the tip of the cylindrical protrusion (8c) is fixed to the inner ring. It is formed so as to be located inside the caulking portion (21). The wheel speed detection sensor (9) is fixed to the annular protrusion (8b), and each displacement sensor (11) is fixed to the columnar protrusion (8c). In this embodiment, the displacement sensor (11) is located at both the position facing the left end surface (16a) of the small diameter portion (16) and the position facing the inner peripheral surface of the inner ring fixing caulking portion (21). Each is provided. A connector portion (22) for attaching a harness connecting the processing means provided on the vehicle body side and the sensor device (2) is integrally formed on the bottom portion of the disc portion (8a) so as to protrude leftward. . The connector part (22) is provided with a signal connector pin (23), and the wheel speed detection sensor (9) and the connector pin (23) are connected via a lead wire (not shown). . Further, a connector part (24) for taking out the output of the displacement sensor (11) to the outside is integrally formed in the disc part (8a) so as to protrude leftward.

  The wheel speed detection sensor (9) is a combination of an annular permanent magnet (9a) and an annular coil (9b), and this configuration is well known, and changes in magnetic flux density accompanying rotation of the pulsar ring (10). By detecting, rotation information such as the rotation speed of the inner ring (17), that is, the wheel speed can be detected.

  The fixed-side raceway member (3) and the rotary-side raceway member (4) are made of bearing steel (magnetic material). Therefore, the distance (displacement) between the two members (3) and (4) is the magnetic flux density. The displacement can be detected by a displacement sensor (11) such as a magnetic impedance sensor for obtaining a displacement by a change.

  Next, referring to FIG. 2, each displacement sensor (11a) (11b) (11c) (11d) (11e) (11f) (11g) (11h) (FIG. In FIG. 1, the arrangement location of (11) is generically referred to, but in the following description, each displacement sensor is given a different symbol.

  As shown in the figure, the cylindrical protrusion (8c) of the resin for fixing the sensor (8) has an outer peripheral surface at the tip part with a slight gap radially inward of the caulking part for fixing the inner ring (21). The tip end surface of the small-diameter portion (16) is positioned so as to be positioned with a slight gap on the left end surface (inner end surface in the axial direction) (16a). The displacement sensors (11a), (11b), (11c), (11d), (11e), (11f), (11g), and (11h) are arranged in a total of eight locations, and these are the inner ring fixing caulking portions (21). The float / sink detection sensors (11a) and (11b) that face the top and bottom of the inner peripheral surface of the vehicle and detect the state of the car's float and sink, and the front part of the inner peripheral surface of the inner ring fixing caulking part (21) and A braking / acceleration detection sensor (11c) (11d) that faces the rear and detects the braking / acceleration state of the car, and a turning state is detected facing the top and bottom of the left end surface (16a) of the small-diameter portion (16). Turning detection sensors (11e) and (11f), and turning detection sensors (11g) and (11h) that face the front and rear of the left end face (16a) of the small diameter portion (16) and detect the turning state. ing.

  According to these displacement sensors (11a), (11b), (11c), (11d), (11e), (11f), (11g), and (11h), the floating that is faced to the top of the inner peripheral surface of the inner ring fixing caulking portion (21) -If the displacement of the sink detection sensor (11a) minus the displacement of the float / sink detection sensor (11b) facing the bottom is positive, the car may be in a sinking state (a state where the vertical load has increased) When this is negative, it turns out that the car is in a floating state (the vertical load is reduced), and the braking applied to the front part of the inner peripheral surface of the inner ring fixing caulking part (21)・ When the displacement of the acceleration detection sensor (11c) minus the displacement of the rear-facing braking / acceleration detection sensor (11d) is positive, it indicates that the vehicle is in the braking state (the rearward load increases). On the contrary, when this is negative, it is understood that the vehicle is in an accelerated state (a state where the forward load is increased). Also, the lateral load increase / decrease is obtained by subtracting the displacement of the turning detection sensor (11f) facing the bottom from the displacement of the turning detection sensor (11e) facing the top of the left end surface (16a) of the small diameter portion (16). Represents turning, and the steering detection sensor (11h) facing the rear is subtracted from the displacement of the steering detection sensor (11g) facing the front of the left end face (16a) of the small diameter section (16) Things can represent the increase or decrease in load due to steering. Therefore, the load that changes when the vehicle travels can be determined by obtaining the relationship between the output of each displacement sensor (11a), (11b), (11c), (11d), (11e), (11f), (11g), and (11h) in advance. Can be obtained from the outputs of the displacement sensors (11a) (11b) (11c) (11d) (11e) (11f) (11g) (11h).

It is a longitudinal cross-sectional view which shows one Embodiment of the hub unit with a sensor by this invention. It is an enlarged view of the principal part of the hub unit with a sensor by this invention, (a) is a longitudinal cross-section, (b) is sectional drawing which follows the bb line of (a), (c) is cc of (a). It is sectional drawing which follows a line.

Explanation of symbols

(1) Hub unit
(2) Sensor device
(3) Fixed side raceway member
(4) Rotating track member
(5) Ball (rolling element)
(7) Core
(8) Sensor fixing resin
(8a) Disc part
(8b) Annular protrusion
(8c) Cylindrical protrusion
(9) Wheel speed detection sensor
(11) Displacement sensor
(11a) (11b) Float / sink detection sensor
(11c) (11d) Brake / acceleration detection sensor
(11e) (11f) Turn detection sensor
(11g) (11h) Steering detection sensor
(14) Inner shaft
(15) Large diameter part
(15a) First track groove
(16) Small diameter part
(16a) Left end face (Axial inner end face)
(21) Inner ring fixing required caulking section

Claims (3)

With a sensor comprising a fixed side raceway member fixed to the vehicle body side, a rotation side raceway member having a wheel mounting flange, a hub unit having a rolling element arranged between both raceway members, and a sensor device In the hub unit,
The sensor device includes an annular cored bar fitted to an axially inner end of the fixed-side track member, a sensor fixing resin integrally formed on the cored bar, one wheel speed detection sensor, and at least one displacement sensor. The sensor fixing resin has a disk portion having an outer diameter substantially equal to the outer diameter of the core metal, an annular protrusion provided on the outer peripheral edge of the disk portion, and a disk portion A sensor-equipped hub comprising a cylindrical protrusion provided at the center, wherein a wheel speed detection sensor is fixed to the annular protrusion, and each displacement sensor is fixed to the cylindrical protrusion. unit.   The rotation-side raceway member includes an inner shaft having a large diameter portion having a raceway groove and a small diameter portion having an outer diameter smaller than the diameter of the raceway groove, and an inner ring fitted to the outer diameter of the small diameter portion of the inner shaft, The inner ring is fixed to the inner shaft by caulking the annular inner ring fixing caulking portion provided on the inner end surface in the axial direction of the small diameter portion of the inner shaft radially outward, and the sensor fixing resin circle The tip of the columnar protrusion is positioned inside the inner ring fixing caulking portion, whereby each displacement sensor faces the axially inner end surface of the small diameter portion or the inner peripheral surface of the inner ring fixing caulking portion. Hub unit with sensor.   Displacement sensors are arranged at a total of 8 locations. The displacement sensors are located on the top and bottom of the inner peripheral surface of the inner ring fixing caulking section, and are used to detect the car's lifting / sinking state and the inner ring fixing caulking. A braking / acceleration detection sensor that detects the braking / acceleration state of the vehicle that faces the front and rear of the inner peripheral surface of the part, and a turning state that faces the top and bottom of the axially inner end surface of the small diameter portion 3. The sensor-equipped hub unit according to claim 2, comprising a turning detection sensor and a turning detection sensor that faces a front portion and a rear portion of an axially inner end face of the small diameter portion and detects a turning state.

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