JP2007187264A - Bearing device for axle and bearing clearance provision method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for an axle, and its bearing clearance provision method capable of improving assembling workability. <P>SOLUTION: An inner ring 17 is inserted into a step portion 16a from one end portion side of an inner shaft main body 16, and pressed to a position to achieve a state that the bearing device 10 for the axle has a positive bearing clearance, then an outer ring 11 is axially moved, its axial moving quantity is measured, and the inner ring 17 is further pressed in by a value obtained by adding a prescribed bearing clearance quantity to the axial moving quantity, thus a negative bearing clearance is applied to the bearing device 10 for the axle. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an axle bearing device for supporting a wheel of an automobile or the like and a bearing clearance providing method thereof.

Axle bearing devices are used to support wheels of automobiles and the like. FIG. 6 is an axial cross-sectional view showing a conventionally used axle bearing device. The axle bearing device 60 includes a rolling bearing portion constituting a double row angular ball bearing, and includes an outer ring 61, a hub 62, and balls 63 as a plurality of rolling elements.
Of these, the outer ring 61 has first and second outer ring raceways 61a and 61b formed on the inner peripheral surface thereof, and an attachment portion 61c for mounting to the vehicle body on the outer peripheral surface. The hub 62 constitutes an axle on which a wheel (not shown) is attached at the same time as a rotating wheel. First and second inner ring raceways 62a and 62b facing the first and second inner ring raceways 61a and 61b are formed on the outer peripheral surface of the hub 62, and a wheel mounting flange portion is formed at one end thereof. 62c is provided. A plurality of balls 63 are arranged between the first and second outer ring raceways 61a and 61b and the first and second inner ring raceways 62a and 62b, respectively, so as to roll freely. That is, the rolling bearing portion includes the raceways 61a, 61b, 62a, 62b and a plurality of balls 63.

The hub 62 is configured by combining a hub body 64 and an inner ring 65. The hub main body 64 includes the first inner ring raceway 62a described above on the outer peripheral surface, and includes the flange portion 62c described above at one end. A stepped portion 64a having a smaller diameter than the inner ring raceway 62a is formed at the other end portion.
The inner ring 65 has a second inner ring raceway 62b formed on the outer peripheral surface, and is inserted into the stepped portion 64a in a press-fit state until the small diameter end surface abuts on the stepped surface 64a1 formed at the starting end portion of the stepped portion 64a. Has been. The inner ring 65 is fixed to the hub main body 64 by pressing the large-diameter end surface of the inner ring 65 with a caulking portion formed on the other end surface of the hub main body 64.
Further, a preload is applied to the rolling bearing portion in order to ensure the life and rigidity of the bearing, and in order to apply this preload, the inner ring 65 is pushed into and fixed to the stepped portion 64a, and the rolling bearing portion is fixed. A negative bearing gap is provided (see, for example, Patent Document 1).

JP 7-127634 A (page 3)

In order to provide a negative bearing gap in the rolling bearing portion of the conventional axle bearing device 60, the pitch dimension in the axial direction between the track center of the first outer ring track 61a and the track center of the second outer ring track 61b, The distance dimension in the axial direction between the small-diameter end face of the inner ring 65 and the track center of the second inner ring track, the distance dimension in the axial direction between the step surface 64a1 of the hub body 64 and the track center of the first inner ring track, and the ball 63 The diameter dimension is managed for each part, and when the inner ring 65 is inserted until it comes into contact with the stepped surface 64a1, a predetermined negative bearing gap is provided to the rolling bearing part. I chose and combined things.
For this reason, it is necessary to work each part with high accuracy, measure and manage these part dimensions individually, and select an optimal combination of part dimensions from among them. Workability was significantly reduced.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an axle bearing device and a bearing clearance applying method capable of easily providing a predetermined negative bearing clearance.

  A first invention for achieving the above object includes an outer ring having first and second outer ring raceways formed on an inner peripheral surface, and first and second opposing the first and second outer ring raceways. An inner shaft having an inner ring raceway formed on the outer peripheral surface, and a plurality of rolling elements arranged in a freely rollable manner between the first and second outer ring raceways and the first and second inner ring raceways. An inner shaft main body in which the first inner ring raceway is formed on an outer peripheral surface and a step portion having a smaller diameter than the outer peripheral surface is formed on one end portion; The second inner ring raceway is formed on the surface, and a predetermined negative bearing gap is given to the rolling bearing portion by being pushed and fixed to the step portion from one end portion side of the inner shaft main body. An axle bearing device comprising an annular inner ring, wherein the inner shaft body A stepped surface connecting the outer circumferential surface and an outer peripheral surface of the stepped portion, and the side end surface of the inner ring facing the stepped surface, and characterized in that spaced in accordance with the negative bearing clearance.

According to the axle bearing device configured as described above, since the step surface and the end surface of the inner ring are separated according to the negative bearing gap, a predetermined negative bearing gap is provided. Therefore, even if the inner ring is pushed in and fixed, variations in the axial fixed position in the inner ring caused by individual component errors or the like can be allowed.
Therefore, even when a predetermined negative bearing gap is provided to the rolling bearing portion, it is not necessary to manage the individual component dimensions of the outer ring, the inner shaft main body, the inner ring, the rolling element and the like with high accuracy.

  A second invention for achieving the above object is a bearing clearance applying method for providing a bearing clearance to the axle bearing device, wherein an inner ring is connected to a step portion of the inner shaft main body. When pushing from the one end side, a predetermined negative bearing gap is provided to the rolling bearing portion by adjusting the pushing amount of the inner ring.

  According to the bearing clearance applying method for an axle bearing device configured as described above, when the predetermined negative bearing clearance is applied to the rolling bearing portion, the step surface and the side end surface of the inner ring are As described above, it is possible to allow variation in the axial fixed position of the inner ring due to individual component accuracy and the like. Accordingly, by adjusting the pushing amount of the inner ring without managing the individual part dimensions such as the outer ring, the inner shaft main body, the inner ring, and the rolling element with high accuracy, a predetermined negative load is applied to the rolling bearing portion. The bearing gap can be provided.

In the bearing clearance method of the axle bearing device, the inner ring is pushed into the step portion from one end side of the inner shaft main body to a position where the rolling bearing portion has a positive bearing clearance, and the outer ring is The axial movement amount may be measured by moving in the axial direction, and a value obtained by adding a predetermined bearing clearance amount to the axial movement amount may be adjusted as the pushing amount of the inner ring.
In this case, by measuring the amount of axial movement of the outer ring, it is possible to grasp the current amount of bearing clearance of the rolling bearing portion that serves as a reference for providing a predetermined negative bearing clearance to the rolling bearing portion. it can. Therefore, by adding a predetermined bearing clearance amount to this axial movement amount, it is possible to obtain the amount of pushing of the inner ring for providing a predetermined negative bearing clearance to the rolling bearing portion.

In the bearing clearance method for the axle bearing device, the rotational resistance of the rolling bearing portion and the bearing clearance amount obtained in advance by measuring the rotational resistance of the rolling bearing portion while pushing the inner ring into the stepped portion. The amount of bearing clearance at the time of being pushed in may be calculated from the above correlation, and the amount of pushing of the inner ring may be adjusted based on the calculated amount of bearing clearance.
In this case, by measuring the rotational resistance of the rolling bearing portion while pushing the inner ring, the pushing amount of the inner ring can be adjusted while confirming the bearing clearance amount. Therefore, the amount of bearing clearance can be measured and confirmed up to a position where a predetermined negative bearing clearance is provided, and a predetermined negative bearing clearance can be reliably applied to the rolling bearing portion.

In the bearing clearance method of the axle bearing device, the natural frequency is measured in advance by applying a predetermined rotation or a predetermined vibration to the rolling bearing portion while pushing the inner ring into the stepped portion. From the correlation between the natural frequency when the rolling bearing portion is rotated or vibrated and the bearing gap amount, the bearing gap amount when being pushed in is calculated, and the inner ring is pushed in based on the calculated bearing gap amount. The amount may be adjusted.
In this case, by measuring the natural frequency of the rolling bearing portion while pushing the inner ring, the pushing amount of the inner ring can be adjusted while confirming the bearing clearance amount. Therefore, the amount of bearing clearance can be measured and confirmed up to a position where a predetermined negative bearing clearance is provided, and a predetermined negative bearing clearance can be reliably applied to the rolling bearing portion.

  As described above, according to the axle bearing device and the bearing gap imparting method thereof according to the present invention, it is not necessary to manage and select the dimensions of each component with high accuracy, and thus a predetermined negative bearing gap is easily imparted. can do.

  Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an axial cross-sectional view showing a configuration of a main part of an axle bearing device according to a first embodiment of the present invention. The axle bearing device 10 is used as a device that rotatably supports a wheel of a vehicle such as an automobile with respect to a suspension device.

The axle bearing device 10 includes a rolling bearing portion that constitutes a double-row angular ball bearing, and includes an outer ring 11, an inner shaft (hub) 12, and a plurality of balls disposed between the outer ring 11 and the inner shaft 12. Rolling elements 13, retainers 14 for holding the respective rolling elements 13, and annular seals 15 and 15 provided in an annular gap between the outer ring 11 and the inner shaft 12. .
The outer ring 11 is a fixed ring fixed on the vehicle body side, and first and second outer ring raceways 11a and 11b are formed on the inner peripheral surface thereof, and an attachment portion 11c for attaching to the vehicle body is formed on the outer peripheral surface. ing.
The inner shaft 12 is a rotating wheel and constitutes an axle to which a wheel (not shown) is attached, and is disposed concentrically on the inner peripheral side of the outer ring 11. The inner shaft 12 is formed with first and second inner ring raceways 12a and 12b facing the first and second outer ring raceways 11a and 11b on the outer peripheral surface thereof, and at one end thereof for attaching a wheel. The inlay portion 12c and the flange portion 12d are provided, and a plurality of hub bolts 12e for fixing wheels and the like are fixed to the flange portion 12d.
A plurality of rolling elements 13 are rotatably arranged between the first and second outer ring raceways 11a and 11b and the first and second inner ring raceways 12a and 12b. That is, the rolling bearing portion includes the raceways 11a, 11b, 12a, 12b and a plurality of rolling elements 13.

The inner shaft 12 is configured by combining an inner shaft main body 16 and an inner ring 17. The inner shaft main body 16 has the first inner ring raceway 12a described above formed on the outer peripheral surface and the flange portion 12d described above at one end. A step 16a having a smaller diameter than the inner ring raceway 12a is formed at the other end. The outer peripheral surface of the step portion 16a and the outer peripheral surface 16c of the inner shaft main body 16 are connected by a step surface 16a1.
The inner ring 17 is formed in an annular shape, and a second inner ring raceway 12b is formed on the outer peripheral surface thereof. The inner ring 17 is inserted into the stepped portion 16a in a press-fitted state with a space P between the small-diameter side end surface 17a as the axially inner end surface and the step surface 16a1. The inner ring 17 is fixed to the inner shaft main body 16 by pressing the large-diameter side end surface 17b of the inner ring 17 with a caulking portion 16b formed on the other end surface of the inner shaft main body 16.
In addition, the inner ring 17 is fixed by being pushed so that the rolling bearing portion is provided with a negative bearing gap having a predetermined bearing gap amount h1.

Here, the bearing clearance in the axial direction of the rolling bearing portion will be described. FIG. 2A schematically shows a state in which the rolling element 13 and the outer ring 11 are assembled in the inner shaft main body 16 and the inner ring 17 is inserted in the step portion 16a in order to assemble the axle bearing device 10. In the drawing, the inner ring raceway pitch dimension Q in the axial direction of the first inner ring raceway 12a and the second inner ring raceway 12b is in the axial direction between the small-diameter side end face 17a of the inner ring 17 and the track center of the second inner ring raceway 12b. The sum of the distance dimension R, the distance dimension S in the axial direction between the step surface 16a1 of the inner shaft main body 16 and the track center of the first inner ring track 12a, and the gap P between the step surface 16a1 and the small-diameter side end surface 17a. Desired.
The axial bearing clearances of the rolling bearing portions are the outer ring raceway pitch dimension T and the inner ring raceway pitch dimension Q in the axial direction between the center of the first outer ring raceway 11a and the center of the second outer ring raceway 11b. It is calculated by the difference between When this difference is positive, the rolling bearing portion has a positive bearing gap, and the outer ring 11 is movable in the axial direction relative to the inner shaft 12 by the amount of the bearing gap at this time. When the difference is 0, the bearing clearance amount of the rolling bearing portion is 0. When the difference is negative, the rolling bearing portion has a negative bearing gap. That is, the inner ring 17 is further pushed in along the step portion 16a from the state where the bearing clearance amount is 0, and preload is applied to the rolling bearing portion.

  As described above, the inner ring 17 of the axle bearing device 10 is pressed and fixed so that the rolling bearing portion becomes a negative bearing gap having a predetermined bearing gap amount h1. That is, the inner ring 17 is further pushed in by a predetermined bearing gap amount h1 from the state where the bearing gap amount is 0, and thereby preload is applied to the rolling bearing portion. As the preload value, an optimum value for the rolling bearing portion is grasped in advance, and a bearing gap amount that can be given the preload value when the rolling bearing portion is a negative bearing gap is obtained. The bearing gap amount is set to a predetermined bearing gap amount h1.

According to the axle bearing device 10 according to the present embodiment configured as described above, a predetermined negative bearing clearance amount of the rolling bearing portion is provided between the step surface 16a1 and the small-diameter side end surface 17a. The gap P is formed. Thereby, even if the inner ring 17 is pushed and fixed to give a predetermined negative bearing gap, the step surface 16a1 and the small diameter side end face 17a can be separated according to the bearing gap, and individual component errors, etc. The variation in the axial fixed position of the inner ring 17 caused by the above can be allowed.
Therefore, even when a predetermined negative bearing gap is provided to the rolling bearing portion, it is not necessary to manage the individual component dimensions of the outer ring 11, the inner shaft main body 16, the inner ring 17, the rolling element 13, and the like with high accuracy.

Next, a bearing clearance applying method for the axle bearing device 10 according to the second embodiment of the present invention will be described. In order to provide the bearing clearance to the axle bearing device 10, first, the rolling element 13 and the outer ring 11 are assembled into the inner shaft main body 16 fixed to the fixing jig K as shown in FIG. The inner ring 17 is inserted into.
Then, as shown in FIG. 2B, the punch Y is rotated as shown by the arrow in the drawing to caulk the caulking portion 16b, lower the punch Y downward, and push the inner ring 17 in. For example, the punch Y is formed into a projection having a smooth curve using a cemented carbide or the like, and is attached to a linear cylinder or the like controlled by a hydraulic servo (not shown). Can be accurately controlled.
Here, the inner ring 17 is pushed to a position where the rolling bearing portion has a positive bearing gap. In addition, it is not necessary to push in with the punch Y up to this position, and normal press-fitting (such as pushing the large end surface of the inner ring with a jig) may be used. Then, by moving the outer ring 11 up and down in the axial direction, an axial movement amount h2 that the outer ring 11 can move in the axial direction is measured using a dial gauge or the like.

  Next, a pushing amount is calculated by adding a predetermined bearing gap amount h1 to the axial movement amount h2, and with this pushing amount, the inner ring 17 is pushed in while the caulking portion 16b is further caulked, and the axle bearing device 10 is pushed in. A predetermined negative bearing gap (having a bearing gap amount h1) is provided.

  In the bearing clearance imparting method for an axle bearing device according to the present embodiment configured as described above, the axial movement amount h2 when the rolling bearing portion has a positive bearing clearance is expressed by the outer ring raceway pitch dimension T. And the inner ring raceway pitch dimension Q, which is the bearing clearance amount of the rolling bearing portion at this stage. Thus, an inner ring for giving a negative bearing clearance having a predetermined bearing clearance amount h1 to the rolling bearing portion by grasping the current bearing clearance amount (axial movement amount h2) and using this as a reference. A pushing amount of 17 can be obtained.

Further, as described above, the step surface 16a1 of the step portion 16a and the small-diameter side end surface 17a of the inner ring 17 are separated according to the negative bearing gap amount. Even if it is pushed in, it is possible to allow variations in the axial fixed position of the inner ring 17 caused by the diameter of the rolling element 13 and other component errors.
Accordingly, the push amount of the inner ring 17 is adjusted based on the current bearing clearance amount without managing the distance dimensions R and S, the outer ring raceway pitch dimension T, and the diameter dimension of the rolling element 13 with high accuracy. Thus, a predetermined negative bearing gap can be easily provided to the axle bearing device 10.

In the above conventional example, since the inner ring 17 is assembled based on the dimension R measured by the inner ring 17 alone, the inner ring 17 may not match the dimension R when the inner ring 17 is inserted into the stepped portion 16a. The bearing gap amount based on the dimension measured as a single unit and the bearing gap amount after being assembled as the axle bearing device 10 do not coincide with each other, causing variations in the values. In addition, since the bearing gap amount is determined in a state where the inner ring 17 is pushed in until it comes into contact with the step surface 16a1, the bearing gap amount cannot be adjusted, and it is inevitable that the bearing gap amount varies.
On the other hand, in the present embodiment, in the process in which each component is assembled as a bearing device, a predetermined negative bearing clearance is provided, so that variations caused in the bearing clearance amount of the rolling bearing portion due to the above cause can be suppressed and stable. A quality axle bearing device 10 can be obtained.

  FIG. 3 is a schematic diagram for explaining a bearing clearance applying method for an axle bearing device according to a third embodiment of the present invention. The main difference between the present embodiment and the first embodiment is that an annular outer ring driving jig 20 that is detachably fixed to the outer circumferential surface of the outer ring 11 and has a gear formed on the outer circumferential surface, and the outer ring. A motor including a torque meter (not shown) to which a gear 21 that meshes with a gear formed on the driving jig 20 is attached is used. Since other points are the same as those of the second embodiment, description thereof is omitted.

In the figure, the outer ring driving jig 20 rotates the outer ring 11 via a gear 21 by a motor (not shown). The rotational resistance of the outer ring 11 when a predetermined rotation is given by the motor can be measured by a torque meter provided in the motor.
The value of the rotational resistance of the outer ring 11 has a certain correlation with the bearing clearance amount of the rolling bearing portion. By grasping this correlation in advance, the rotational resistance of the rolling bearing portion is determined from the rotational resistance of the outer ring 11. The amount of bearing clearance can be calculated.

In the bearing clearance imparting method for the axle bearing device of the present embodiment, first, the rolling element 13 and the outer ring 11 are assembled into the inner shaft main body 16 and the inner ring 17 is inserted into the step portion 16a, as in the second embodiment. Then, the inner ring 17 is pushed downward while the caulking portion 16b is caulked by the punch Y.
And the inner ring | wheel 17 is pushed in to the position before the rolling bearing part provides a predetermined negative bearing clearance.
Next, while further pushing the inner ring 17, the outer ring 11 is rotated by the motor, and the value of the rotational resistance is measured. By calculating the bearing clearance amount of the rolling bearing portion from the rotation resistance value obtained at this time, a negative bearing clearance having a predetermined bearing clearance amount h1 is given to the rolling bearing portion while checking the bearing clearance amount. Push the inner ring 17 to the position.

According to the bearing clearance imparting method of the axle bearing device of the present embodiment configured as described above, the rotational resistance of the rolling bearing portion is measured while pushing the inner ring 17, thereby confirming the bearing clearance amount and the inner ring 17. The pushing amount can be adjusted. Accordingly, the amount of bearing clearance can be measured and confirmed up to a position where a predetermined negative bearing clearance is provided, and a predetermined negative bearing clearance can be reliably applied to the rolling bearing portion.
Further, in the present embodiment, since the pushing amount of the inner ring 17 is determined based on the actually measured bearing gap amount, a negative bearing gap can be provided with an arbitrary bearing gap amount.

  FIG. 4 is a schematic diagram for explaining a bearing clearance providing method for an axle bearing device according to a fourth embodiment of the present invention. The main difference between this embodiment and the third embodiment is that the vibration sensor 30 is attached to the outer peripheral surface of the outer ring 11 and the inner shaft main body 16 is fixed without using the motor or the outer ring driving jig 20 or the like. The vibration device 32 is attached to the upper surface K1 of the fixing jig K. Since other points are the same as those of the second embodiment, description thereof is omitted.

In the figure, the vibration device 32 is for applying a predetermined vibration to the axle bearing device 10 via the fixing jig K, and includes a known vibration mechanism using hydraulic pressure or air pressure.
The vibration sensor 30 attached to the outer ring 11 uses a known vibration pickup or the like, and can measure the vibration of the axle bearing device 10 that resonates due to vibration from the vibration device 22. The acquired vibration data is sent from the harness 31 to a recording device (not shown), and the natural frequency of the axle bearing device 10 can be obtained from the measured vibration.
The value of the natural frequency obtained by the vibration sensor 30 has a certain correlation with the bearing clearance amount of the rolling bearing portion, and the natural frequency to be measured can be measured by grasping this correlation in advance. From this value, the bearing clearance amount of the rolling bearing portion can be calculated.

In the bearing clearance imparting method for the axle bearing device of the present embodiment, first, as in the third embodiment, the rolling element 13 and the outer ring 11 are assembled into the inner shaft main body 16, and the inner ring 17 is inserted into the step portion 16a. Then, the inner ring 17 is pushed downward while the caulking portion 16b is caulked by the punch Y.
And the inner ring | wheel 17 is pushed in to the position before the rolling bearing part provides a predetermined negative bearing clearance.
Next, while pushing the inner ring 17 further, a predetermined vibration is applied to the axle bearing device 10 by the vibration device 32, and its natural frequency is measured. By calculating the bearing clearance amount of the rolling bearing portion from the natural frequency value obtained at this time, a negative bearing clearance having a predetermined bearing clearance amount h1 is applied to the rolling bearing portion while checking the bearing clearance amount. The inner ring 17 is pushed in to the position.

According to the bearing clearance imparting method of the axle bearing device of the present embodiment configured as described above, the inner ring 17 is checked while checking the bearing clearance amount by measuring the natural frequency of the rolling bearing portion while pushing the inner ring 17. The amount of pushing can be adjusted. Accordingly, the amount of bearing clearance can be measured and confirmed up to a position where a predetermined negative bearing clearance is provided, and a predetermined negative bearing clearance can be reliably applied to the rolling bearing portion.
In the present embodiment, the motor and jigs are not installed and fixed as in the third embodiment, but only the vibration device 32 and the vibration sensor 30 are attached to the fixing jig K and the outer ring 11, respectively. Since the bearing clearance amount of the rolling bearing portion can be easily measured, the assembly workability of the axle bearing device 10 can be further improved.

  Further, in this embodiment, the vibration device 32 is attached to the fixing jig K, but may be directly attached to a part of the axle bearing device 10. Further, when measuring the vibration, the natural frequency may be measured when the outer ring 11 or the inner shaft 12 is rotated at a predetermined rotational speed without being vibrated. Further, although the vibration sensor 30 is attached to the outer peripheral surface of the outer ring 11, it may be attached to other parts of the axle bearing device 10 such as the inner shaft main body 16 as long as the natural frequency can be measured.

  The present invention is not limited to the above embodiment. In each of the above embodiments, the inner ring 17 is inserted and fixed to the stepped portion 16a in a press-fitted state while the caulking portion 16b is caulked using the punch Y. Etc. There is no particular limitation. For example, a thread portion is provided on the outer peripheral surface of the step portion 16a and the inner peripheral surface of the inner ring 17, and the inner ring 17 is inserted while being screwed into the step portion 16a and is pushed along the step portion 16a. The present invention can also be applied to an axle bearing device using an inner ring insertion device as shown in FIG.

  In FIG. 5, the inner ring insertion device 40 includes a fixing base 41 for fixing the vehicle bearing device 10, and a flange 42 a that is fitted and fixed to the outer peripheral surface of the inner ring 17 and has a gear formed on the outer peripheral surface. A cylindrical inner ring holder 42, a motor 43 for rotating a gear 43a that meshes with the gear of the flange 42a, a frame 44 that fixes the motor 43, and a sensor support attached to the frame 44 A displacement sensor 45 attached to the part 45a and a linear cylinder 46 attached to the frame 44 for moving the frame 44 up and down relative to the fixed base 41 are provided.

The inner ring holder 42 holds the inner ring 17 so as to be integrally rotatable, and is rotatably attached to a boss 47 fixed to the sensor support portion 45a via a rolling bearing 48. The inner ring holder 42 is formed with a flange 42a having a gear formed on the outer peripheral surface thereof, and a gear 43a driven by a motor 43 is engaged with the gear. A displacement sensor 45 for detecting the relative position in the vertical direction between the end surface of the inner shaft body 16 and the end surface of the inner ring 17 passes through the boss 47 and the inner ring holder 42 in the sensor support portion 45a attached to the frame 44. The inner shaft body 16 is disposed in contact with the end surface.
These are attached to the frame 44 and can be moved up and down integrally by a linear cylinder 46. Then, by moving the frame 44 up and down, the inner ring 17 can be inserted and pushed in while being screwed into the step portion 16a by rotating the inner ring holder 42 while applying a load only to the inner ring 17. ing. Further, the pushing amount of the inner ring 17 can be measured by the displacement sensor 45.

  By using the inner ring insertion device 40 as described above, the present invention can also be applied to an axle bearing device in which the inner ring 17 is inserted and pushed in while being screwed into the stepped portion 16a.

  In each of the above embodiments, an axle bearing device having a configuration in which the inner shaft is a rotating wheel is shown, but the present invention can also be applied to an axle bearing device having a configuration in which the outer ring is a rotating wheel. Moreover, in each said embodiment, although the double row angular contact ball bearing was used for the axle bearing apparatus, you may use a double row tapered roller bearing, for example.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an axial cross-sectional view showing a main configuration of an axle bearing device according to a first embodiment of the present invention. It is a figure for demonstrating the bearing clearance provision method of the axle bearing device which concerns on 2nd embodiment of this invention, (a) is the state which inserted the inner ring | wheel into the step part in order to assemble an axle bearing device. FIG. 5B schematically shows a state in which the inner ring is pushed in while caulking the caulking portion. It is a schematic diagram for demonstrating the bearing clearance provision method of the axle bearing apparatus which concerns on 3rd embodiment of this invention. It is a schematic diagram for demonstrating the bearing clearance provision method of the axle shaft bearing apparatus which concerns on 4th embodiment of this invention. It is the schematic which shows the structure of an inner ring insertion apparatus. It is an axial sectional view showing the configuration of a conventional axle bearing device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Axle bearing apparatus 11 Outer ring 11a, 11b First and second outer ring raceway 12 Inner shaft 12a, 12b First and second inner ring raceway 13 Rolling element 16 Inner shaft main body 16a Step part 16a1 Step surface 17 Inner ring 17a Smaller diameter side End face

Claims (5)

An outer ring having first and second outer ring raceways formed on an inner peripheral surface, and an inner shaft having first and second inner ring raceways opposed to the first and second outer ring raceways formed on an outer peripheral surface; A rolling bearing portion having a plurality of rolling elements arranged to be freely rollable between the first and second outer ring raceways and the first and second inner ring raceways,
The inner shaft has an inner shaft body in which the first inner ring raceway is formed on an outer peripheral surface, and a step portion having a smaller diameter than the outer peripheral surface is formed at one end portion;
The second inner ring raceway is formed on the outer peripheral surface, and a predetermined negative bearing gap is given to the rolling bearing portion by being pushed into and fixed to the step portion from one end side of the inner shaft main body. An axle bearing device having an annular inner ring,
A stepped surface connecting the outer peripheral surface of the inner shaft main body and the outer peripheral surface of the stepped portion and a side end surface of the inner ring facing the stepped surface are separated according to the negative bearing gap. Axle bearing device. A bearing clearance applying method for providing a bearing clearance to the axle bearing device according to claim 1,
When the inner ring is pushed into the step portion of the inner shaft main body from one end side of the inner shaft main body, a predetermined negative bearing clearance is provided to the rolling bearing portion by adjusting the pushing amount of the inner ring. A bearing clearance applying method for an axle bearing device.   The inner ring is pushed into the step part from one end side of the inner shaft main body to a position just before the bearing clearance of the rolling bearing part becomes negative, and the outer ring is moved in the axial direction to measure the axial movement amount. 3. A bearing gap imparting method for an axle bearing device according to claim 2, wherein a value obtained by adding a predetermined bearing gap amount to the axial movement amount is used as the pushing amount of the inner ring.   The amount of bearing clearance when the inner ring is pushed in from the correlation between the rotation resistance of the rolling bearing portion and the amount of bearing clearance determined in advance by measuring the rotational resistance of the rolling bearing portion while pushing the inner ring into the stepped portion. The bearing clearance imparting method for an axle bearing device according to claim 2, wherein the amount of pushing of the inner ring is adjusted based on the calculated bearing clearance amount.   The rolling bearing portion obtained in advance was rotated or excited by measuring the natural frequency by applying a predetermined rotation or a predetermined vibration to the rolling bearing portion while pushing the inner ring into the stepped portion. The axle clearance according to claim 2, wherein a bearing clearance amount when being pushed in is calculated from a correlation between a natural frequency at the time and a bearing clearance amount, and the pushing amount of the inner ring is adjusted based on the calculated bearing clearance amount. A bearing clearance imparting method for a bearing device.

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