JPH0669848U - Rolling bearing unit with rotation speed detector - Google Patents

Abstract

(57) [Abstract] [Purpose] The retaining ring 24 shifts in the axial direction during transportation, and the sensor 17a and the annular portion 22 functioning as a tone wheel.
Prevent contact with. [Structure] A collar portion 29 is formed on the inner peripheral surface of a retaining ring 24. The outer surface 29a of the collar portion 29 and the inner end surface 2a of the inner ring 2 are brought into contact with each other. With the two surfaces 29a, 2a in contact, the size of the gap between the sensor 17a and the ring-shaped portion 22 becomes an appropriate value.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 A rolling bearing unit with a rotation speed detecting device according to the present invention is used to rotatably support a wheel of an automobile with respect to a suspension device and detect the rotation speed of the wheel.

[0002]

[Prior art]

 In order to rotatably support an automobile wheel with respect to a suspension device and to control an anti-lock brake system (ABS) or a traction control system (TCS), it is conventionally necessary to detect the rotational speed of the wheel. For example, a rolling bearing unit with a rotation speed detecting device as described in US Pat. No. 4,968,156 is known.

The rolling bearing unit with a rotation speed detecting device described in the above specification is configured as shown in FIGS. A pair of inner races 2, 2 joined by a joint ring 1 are fitted onto a non-rotating axle 3. The inner rings 2 and 2 are sandwiched and fixed between the holder 4 and the nut 5. Inner ring raceways 6, 6 are formed on the outer peripheral surface of each inner ring 2, 2.

Further, double rows of outer ring tracks 8 are formed on the inner peripheral surface of the hub 7, which is a member corresponding to the outer ring that rotates during use. A plurality of balls 9, 9 are provided between the outer ring raceways 8, 8 and the inner ring raceways 6, 6 to rotatably support the hub 7 around the axle 3. The wheel 10 of the wheel is fixed to a flange 11 provided on the outer peripheral surface of the hub 7.

Further, the inner end of the hub 7 (inside means the widthwise central portion when assembled in an automobile, right in FIGS. 1 to 7. Conversely, the vehicle widthwise outer portion is the outside) is opened. A core metal 13 forming a seal ring 12 is fitted and fixed in the portion. A ton wheel 14 is fixed to the core bar 13. The tone wheel 14 is composed of permanent magnets, and S poles and N poles are arranged alternately in the circumferential direction.

On the other hand, a retaining ring 15 formed by drawing a metal plate is externally fitted and fixed to the inner end portion of the inner inner ring 2 of the pair of inner rings 2, 2. The leading edge of the seal member 16 constituting the seal ring 12 is slidably contacted with the inner peripheral surface and the outer surface of the retaining ring 15 to prevent dust and rainwater from entering the parts where the balls 9 and 9 are installed. is doing. Further, a sensor 17 is supported and fixed to a part of the holding ring 15, and a detecting portion of the sensor 17 is opposed to an inner side surface of the tone wheel 14.

In the case of the rolling bearing unit with the rotation speed detecting device as described above, the wheel fixed to the hub 7 can be rotatably supported on the axle 3 on which the inner rings 2 and 2 are fitted and supported. When the hub 7 rotates as the wheels rotate, the output of the sensor 17 facing the side surface of the tone wheel 14 fixed to the hub 7 changes. The frequency at which the output of the sensor 17 changes is proportional to the rotational speed of the wheel. Therefore, if the output signal of the sensor 17 is input to a controller (not shown), the rotational speed of the wheel can be obtained and ABS and TCS can be adjusted appropriately. It can be controlled.

[0008]

[Problems to be solved by the device]

 However, in the case of the conventional structure as described above, it is considered that the positional relationship between the tone wheel 14 and the sensor 17 is displaced after the assembly of the rolling bearing unit with the rotational speed detection device is completed. Speed detection cannot be performed. That is, the work of fitting the retaining ring 15 holding the sensor 17 onto the inner ring 2 is performed at the rolling bearing unit manufacturing plant, and the work of assembling the rolling bearing unit to the suspension system of the automobile is performed at the automobile assembly plant. If the retaining ring 15 collides with other parts during transportation from the manufacturing plant to the assembly plant, it is possible that the retaining ring 15 may shift with respect to the inner ring 2.

The appropriate value of the gap existing between the tone wheel 14 and the sensor 17 is a small value of 1 mm or less, and the holding ring 15 is displaced with respect to the inner ring 2 even a little. In this case, the rotation speed cannot be detected. In particular, when the tone wheel 14 and the sensor 17 come into contact with each other, when the wheel rotates, either or both parts 14 and 17 are damaged and cannot be repaired unless the parts are replaced.

In order to deal with such a problem, as shown in FIG. 7, a step portion 19 having a diameter smaller than that of the shoulder portion 18 is formed on the shoulder portion 18 of the inner ring 2 and the holding portion is held on the step portion 19. It is also considered to fix the ring 15 on the outside. When this structure is adopted, the distance between the tone wheel 14 and the sensor 17 becomes an appropriate value when the end edge of the retaining ring 15 is abutted against the end face of the step portion 19.

However, in the case of such a structure, a new problem arises that the step 19 is complicated to process, the manufacturing cost is high, and it is difficult to secure the supporting strength of the retaining ring 15. Among these problems, the problem arises from processing the step portion 19 on the inner ring 2 made of hard bearing steel. The problem (1) is caused by the fact that the width dimension of the step portion 19 must be made sufficiently smaller than the width dimension of the shoulder portion 18 in order to maintain the strength of the inner ring raceway 6. In order to maintain the strength of the inner ring raceway 6 and widen the width dimension of the step portion 19, the width dimension of the inner ring 2 must be increased, but such a solution has a limited installation space. In some cases, it cannot be used in rolling bearing units with a rotation speed detector.

The rolling bearing unit with a rotation speed detecting device of the present invention was devised in view of the above-mentioned circumstances.

[0013]

[Means for solving the problem]

 The rolling bearing unit with a rotation speed detecting device of the present invention has an inner ring raceway on the outer peripheral surface and is externally fitted and fixed to a shaft that does not rotate during use, like the above-described conventional rolling bearing unit with a rotation speed detecting device. An inner ring, an outer ring raceway formed on the inner peripheral surface and rotating during use, an outer ring equivalent member, a plurality of rolling elements provided between the inner ring raceway and the outer ring raceway, and a tone fixed to the outer ring equivalent member. It is provided with a wheel, a retaining ring made of a metal plate which is externally fitted and fixed to a shoulder portion of the inner ring, and a sensor which is retained by the retaining ring and faces the tone wheel.

In particular, in the rolling bearing unit with a rotation speed detecting device according to the present invention, the retaining ring has an inner peripheral side cylindrical portion and is folded back 180 degrees diametrically inward from one end edge of the inner peripheral side cylindrical portion. And a collar portion formed by bending the tip edge of the folded portion inward in the diametrical direction. Then, by fitting the folded-back portion onto the shoulder portion of the inner ring and bringing one side surface of the collar portion into contact with the end surface of the inner ring, the sensor is moved in the direction approaching the tone wheel. Characterized by blocking.

[0015]

[Action]

 By the rolling bearing unit with a rotation speed detecting device of the present invention configured as described above, the wheel is rotatably supported around the shaft, and the operation when detecting the rotation speed of the wheel fixed to the outer ring equivalent member is performed. As such, it is similar to the above-described conventional rolling bearing unit with a rotation speed detecting device.

In particular, in the case of the rolling bearing unit with the rotation speed detecting device of the present invention, the one side surface of the flange portion and the end surface of the inner ring contact each other to prevent the sensor from moving in the direction approaching the tone wheel. As a result, the retaining ring and the sensor held by this retaining ring do not move toward the tone wheel before they are assembled to the suspension device during transportation, etc., and these sensors come in contact with the tone wheel and rotate. The function of the speed detection device is not impaired.

[0017]

【Example】

 1 and 2 show a first embodiment of the present invention. Similar to the case of the conventional structure described above, the pair of inner rings 2, 2 each having the inner ring raceways 6, 6 formed on the outer peripheral surfaces thereof are the axles 3 which are shafts that do not rotate during use (see FIG. 5, FIG. 1 to FIG. 1). 2 is omitted.) A hub 7, which is a member corresponding to the outer ring that rotates during use, is arranged around the inner rings 2 and 2 concentrically with the inner rings 2 and 2. A plurality of balls 9, 9 are provided between each of the inner ring raceways 6, 8 and the double row outer ring raceways 8, 8 formed on the inner peripheral surface of the hub 7. A hub 7 is rotatably supported around the circumferences of 2 and 2.

A flange 11 for fixing a wheel 10 (FIG. 5) of a wheel is provided on the outer peripheral surface of the hub 7. Further, a core metal 20 constituting a seal ring 12a is externally fitted and fixed to the inner end portion of the hub 7. The cored bar 20 made of a magnetic metal plate is formed in an annular shape with an L-shaped cross section, and has a cylindrical portion 21 fitted and fixed to the inner end of the hub 7 and a cylindrical portion 21. And a ring-shaped portion 22 that is bent at a right angle inward from the inner end edge of the. By forming a large number of notches 36, 36 on the inner peripheral edge of the ring-shaped portion 22 at equal intervals in the circumferential direction, the magnetic characteristics in the circumferential direction are alternately made different. Therefore, the ring-shaped portion 22 has a function as a tone wheel. On the other hand, a sealing material 23 made of an elastic material such as rubber is fixed to the outer peripheral surface of the cylindrical portion 21. A plurality of (three in the illustrated example) lips 23a, 23a are formed on the outer peripheral portion of the sealing material 23.

On the other hand, a retaining ring 24 formed by press-molding a metal plate is externally fitted and fixed to the inner end portion of the inner ring 2 inside the pair of inner rings 2, 2. The retaining ring 24 includes an outer peripheral side cylindrical portion 25 and an inner peripheral side cylindrical portion 26 that are concentric with each other, and a circular ring portion 27 that connects the inner end edge portions of both the cylindrical portions 25, 26. Then, a sensor 17a for detecting the rotational speed is held and fixed in a portion surrounded by the outer peripheral side and inner peripheral side cylindrical portions 25 and 26 and the circular ring portion 27 on three sides, and the sensor 17a and the annular portion 22 are provided. It faces the outer surface of the. The conducting wire 30 for taking out the detection signal from the sensor 17a passes through the ring portion 27 and is taken out. In the case of the present embodiment, the sensor 17a has a permanent magnet, a yoke made of a magnetic material, and a coil wound around this yoke, unlike the sensor shown in FIGS. When the ring-shaped portion 22 rotates, an electromotive force is induced in this coil at a frequency proportional to the rotation speed. The structure and operation of the sensor have been well known.

Further, the outer end portion of the outer peripheral side cylinder portion 25 projects from the outer surface of the sensor 17a. Then, the lips 23a, 23a of the sealing material 23 are brought into sliding contact with the inner peripheral surface of the projecting portion. The sealing material 23 prevents dust and rainwater from entering the balls 9, 9 installation portion.

On the other hand, inside the inner peripheral cylindrical portion 26, a part of the metal plate forming the retaining ring 24 is folded back 180 degrees inward in the diametrical direction from the outer edge of the inner peripheral cylindrical portion 26. Therefore, the folded portion 28 is formed. The outer peripheral surface of the folded portion 28 and the inner peripheral surface of the inner peripheral side cylindrical portion 26 are in close contact with each other to form a double cylindrical portion. Further, the tip edge of the folded-back portion 28 is bent at a right angle inward in the diametrical direction to form a collar portion 29.

When the retaining ring 14 holding the sensor 17a is externally fitted and fixed to the inner ring 2, the folded-back portion 28 is externally fitted and fixed to the shoulder portion 18 of the inner ring 2, and the outer surface of the collar portion 29 is formed. 29a and the inner end surface 2a of the inner ring 2 are butted. In this manner, the dimensions of each part are determined so that the distance between the sensor 17a and the inner side surface of the ring-shaped part 22 becomes an appropriate value when the two surfaces 29a, 2a are in contact with each other. Therefore, in a state where the folded-back portion 28 is fitted onto the shoulder portion 18 and the outer surface 29a of the collar portion 29 and the inner end surface 2a of the inner ring 2 are in contact with each other, the sensor 17a and the ring-shaped portion 22 are Even if an external force is applied to the retaining ring 24, the distance from the inner side surface becomes a proper value, and this distance will not become shorter.

Further, in the illustrated embodiment, a circular hole 32 is formed in a part of the inner end surface 2a of the inner ring 2 on the inner side, which is located on the diametrically inner side of the inner peripheral edge of the collar portion 29. The outer half of the spring pin 31 is fitted in the circular hole 32. The inner half portion of the spring pin 31 is fitted into a circular hole formed on the outer end surface of a constant velocity joint (not shown) when the rolling bearing unit with a rotation speed detecting device of the present invention is assembled to a suspension device. Therefore, in the state in which the suspension device has been assembled, the sensor 17a supported by the inner ring 2 via the inner ring 2 and the retaining ring 24 is reliably prevented from rotating around the axle 3. It is possible to prevent the conductive wire 30 from being cut due to the rotation.

The rolling bearing unit with a rotation speed detecting device of the present invention configured as described above is assembled between the axle 3 and the wheel 10 of the wheel, and the hub 7 rotates as the wheel rotates. When is rotated, the output voltage of the sensor 17a facing the inner surface of the ring-shaped portion 22 of the cored bar 20 fitted and fixed to the inner end of the hub 7 changes with the change of the magnetic flux density. The frequency at which the output of the sensor 17a changes is proportional to the rotational speed of the wheel. Therefore, if the output signal of the sensor 17a is input to a controller (not shown), the rotational speed of the wheel can be obtained and the ABS and TCS can be controlled appropriately. I can.

Particularly, in the case of the rolling bearing unit with the rotation speed detecting device of the present invention, the outer surface 29 a of the collar portion 29 formed on the inner peripheral surface of the retaining ring 24 and the inner end surface 2 a of the inner ring 2 are brought into contact with each other. As a result, the sensor 17a held by the holding ring 24 is reliably prevented from moving in the direction of approaching the ring-shaped portion 22. Therefore, even when the holding ring 24 collides with other parts and is applied with an axial outward force before being assembled to the suspension device portion during transportation, the holding ring 24 and the holding ring 24 are not supported. The sensor 17a held by the ring 24 does not move toward the ring-shaped portion 22.

Therefore, the sensor 17a and the ring-shaped portion 22 do not come into contact with each other, and after the assembly is completed, the wheel is rotated while the respective portions 17a and 22 are in contact with each other, thereby damaging each portion and detecting the rotation speed. The function of the device is not impaired. Since the retaining ring 24 including such a collar portion 29 can be relatively easily manufactured by press working a metal plate, the manufacturing cost of the rolling bearing unit with the rotation speed detecting device is rarely increased.

When an axially inward force is applied to the holding ring 24, it is inevitable that the holding ring 24 and the sensor 17 a held by the holding ring 24 move in a direction away from the annular portion 22. However, it is unlikely that a force in such a direction acts during transportation. Also, even if the holding ring 24 and the sensor 17a held by the holding ring 24 and the ring-shaped portion 22 are excessively opened due to the action, each portion is damaged as the wheel rotates. No, repair work is easy.

Next, FIG. 3 shows a second embodiment of the present invention. In the case of the present embodiment, the outer flange portion 33 is formed by bending the outer end portion of the outer peripheral side cylindrical portion 25 forming the retaining ring 24 outwardly in the diametrical direction at a right angle. Further, of the plurality of lips 23a, 23b formed on the outer peripheral surface of the sealing material 23, the outer diameter of the outer lip 23b is increased. Then, the tip edge of the lip 23b and the outer surface of the outer collar portion 33 are brought into sliding contact with each other. Other configurations and operations are the same as in the case of the first embodiment described above.

Next, FIG. 4 shows a third embodiment of the present invention. In the case of the present embodiment, the core metal 20a forming the seal ring 12a has a crank-shaped cross-sectional shape to form a folded portion 34 that is bent outward in the diametrical direction from the outer end of the cylindrical portion 21. is doing. Then, the outer peripheral edge portion of the folding portion 34 and the outer end edge of the outer peripheral side cylindrical portion 25 forming the retaining ring 24 are opposed to each other with a minute gap 35 therebetween. The gap 35 constitutes a kind of labyrinth seal portion and contributes to prevent foreign matter from entering the sensor 17a installation portion. Other configurations and operations are similar to those in the above-described first and second embodiments.

[0030]

[Effect of device]

 Since the rolling bearing unit with a rotation speed detecting device of the present invention is configured and operates as described above, it is ensured that the retaining ring holding the sensor shifts during transportation etc. and the sensor and the tone wheel come into contact with each other. This can be prevented and the reliability of the rotation speed detection device can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is an enlarged view of part A in FIG.

FIG. 3 is a view similar to FIG. 2 showing a second embodiment of the present invention.

FIG. 4 is a view similar to FIG. 2 showing a third embodiment of the present invention.

FIG. 5 is a sectional view showing a first example of a conventional structure.

6 is an enlarged view of part B in FIG.

FIG. 7 is a view showing a second example of the conventional structure, which corresponds to the portion C in FIG. 6.

[Explanation of symbols]

 1 coupling ring 2 inner ring 2a inner end surface 3 axle 4 holder 5 nut 6 inner ring raceway 7 hub 8 outer ring raceway 9 ball 10 wheel 11 flange 12, 12a seal ring 13 core metal 14 tone wheel 15 retaining ring 16 sealant 17, 17a sensor 18 Shoulder portion 19 Step portion 20, 20a Core metal 21 Cylindrical portion 22 Ring portion 23 Sealing material 23a, 23b Lip 24 Holding ring 25 Outer circumferential side cylindrical portion 26 Inner circumferential side cylindrical portion 27 Circle ring portion 28 Folding portion 29 Collar portion 29a Outer surface 30 Conductor wire 31 Spring pin 32 Circular hole 33 Outer collar part 34 Folding part 35 Gap 36 Notch

Claims (1)

[Scope of utility model registration request] 1. An inner ring which has an inner ring raceway on its outer peripheral surface and which is externally fitted and fixed to a shaft that does not rotate during use, an outer ring raceway member which forms an outer ring raceway on its inner peripheral surface and rotates during use, and the inner ring raceway. A plurality of rolling elements provided between the outer ring raceway and the outer ring raceway, a tone wheel fixed to the outer ring equivalent member, a metal plate retaining ring externally fitted and fixed to the shoulder portion of the inner ring, and the retaining ring. In a rolling bearing unit with a rotation speed detection device, which is held by the tone wheel and a sensor that faces the tone wheel, the holding ring includes an inner peripheral side cylindrical portion and one end edge of the inner peripheral side cylindrical portion. It has a folded-back portion that is folded back 180 degrees inward in the diametrical direction and a collar portion that is formed by bending the tip edge of this folded-back portion inward in the diametrical direction. Abut one side surface of the collar portion with the end surface of the inner ring As a result, the rolling bearing unit with a rotation speed detecting device is characterized in that the sensor is prevented from moving in a direction approaching the tone wheel.