JP6380151B2 - Testing equipment for rolling bearing units for wheel support - Google Patents

Description

  The present invention relates to a test apparatus for a wheel-supporting rolling bearing unit for testing the impact resistance of a wheel-supporting rolling bearing unit that rotatably supports a vehicle wheel with respect to a suspension device.

  A wheel of an automobile is supported by a suspension device in a freely rotating manner by a wheel-supporting rolling bearing unit that supports a vertical direction (a direction perpendicular to the road surface) and a horizontal road surface reaction force applied to the suspension device. FIG. 12 shows a so-called inner ring rotating type as an example of the conventional structure of such a wheel supporting rolling bearing unit. The wheel support rolling bearing unit 1 includes an outer ring 2 that is an outer diameter side race ring member, a hub 3 that is an inner diameter side race ring member, and a plurality of balls 4 and 4 each of which is a rolling element. The outer ring 2 has double-row outer ring raceways 5 and 5 on the inner peripheral surface, and a stationary flange 6 for supporting and fixing to the suspension device on the outer peripheral surface. The hub 3 has a rotation-side flange 7 for supporting and fixing a wheel to an outer end portion (a left end portion in FIG. 12) of the outer peripheral surface, and a double-row inner ring at an intermediate portion to an inner end portion. Tracks 8 and 8 are provided. Each of the balls 4 and 4 is provided between the outer ring raceways 5 and 5 and the inner ring raceways 8 and 8 so as to roll freely for each row. In the case of the illustrated example, the balls 4 and 4 are used as rolling elements. However, in the case of a rolling bearing unit for supporting a wheel that is used in a heavy automobile, a tapered roller is used as the rolling element. In some cases.

  If a wheel comprising a combination of a tire and a wheel rides on a curb during driving of the automobile incorporating the wheel supporting rolling bearing unit 1 as described above, the wheel supporting rolling bearing unit 1 is passed through this wheel. To the outer ring raceways 5, 5 and the inner ring raceways 8, 8 are applied to the balls 4, 4 respectively. An indentation may be formed, or scratches may occur on the rolling surfaces of these balls 4 and 4. Therefore, it is necessary to perform a test for knowing the strength (impact resistance) of the wheel bearing rolling bearing unit 1 with respect to the impact load.

  In Patent Document 1, a wheel on which a tire is mounted is fixed in a state where the rotation axis of the wheel is slightly inclined (for example, 13 ± 1 degrees) with respect to the vertical direction, and a weight is freely dropped on the rim of the wheel. Thus, a test device for evaluating the impact resistance of the wheel, mainly against lateral impact loads, is described. Conventionally, a test for evaluating the impact resistance of a wheel bearing rolling bearing unit for supporting a wheel has been performed using a test apparatus having a similar structure. That is, the wheel-supporting rolling bearing unit is fixed in a state in which the axial direction of the central axis coincides with the vertical direction or the central axis is slightly inclined with respect to the vertical direction. The impact resistance of this wheel-supporting rolling bearing unit was evaluated by allowing the weight to fall freely and applying an impact load. Further, in order to more accurately evaluate the impact resistance against the impact load applied to the wheel-supporting rolling bearing unit during traveling of the automobile, the impact applied to the wheel-supporting rolling bearing unit by dropping the weight. It is necessary to regulate the input waveform of the load to a desired shape (in accordance with the input waveform of the impact load applied to the wheel support rolling bearing unit during the traveling of the automobile). For this reason, in the case of the conventional test apparatus, the weight is dropped on the pad while the pad made of vibration-proof rubber is placed on the upper surface of the wheel bearing rolling bearing unit, and the pad is moved. Thus, an impact load is applied to the wheel-supporting rolling bearing unit. That is, it is necessary to adjust the damping characteristics of the impact load applied to the wheel support rolling bearing unit by changing the thickness and material (elastic coefficient) of the pad, and to regulate the input waveform of the impact load. This work is troublesome.

Furthermore, there is room for improvement in order to more accurately examine the strength against the impact load applied to the wheel bearing rolling bearing unit while the automobile is running. The reason for this will be described below.
When the test apparatus described in Patent Document 1 is used, the impact resistance of the rolling bearing unit for supporting the wheel in a state where the hub is not rotating with respect to the outer ring (the hub and the outer ring are not rotating relative to each other). To evaluate. When an impact load is applied to the wheel support rolling bearing unit in a state where the hub and the outer ring are not relatively rotated, indentations are formed on the raceway surfaces (outer ring raceway, inner ring raceway) in the direction of the impact load ( Metal material existing on the raceway surface is plastically deformed in the direction of impact load). With the formation of indentations on the raceway surface, when the contact area between the raceway surface and the rolling surface of the rolling element increases, the surface pressure at the contact portion between the raceway surface and the rolling surface decreases. When a load is applied to the contact portion, the static shear stress generated in the metal material is reduced. And when this static shear stress becomes below the yield shear stress of the metal material which comprises a hub and an outer ring | wheel, an indent will no longer be formed.

  On the other hand, for example, when a wheel rides on a curb during driving of an automobile, the wheel support rolling bearing unit is in a state where the hub is rotating with respect to the outer ring (the hub and the outer ring are rotating relative to each other). Impact load is applied to the. That is, the rolling contact portion between the rolling element and the raceway surface moves in the circumferential direction in accordance with the rotation of the hub with respect to the outer ring with an impact load applied to the wheel support rolling bearing unit. In addition, the indentation is formed in a continuous state in the circumferential direction. Further, since the impact load is applied while the rolling contact portion moves in the circumferential direction, the load applied to the raceway surface is similar to the case where an indentation is formed in a state where the hub and the outer ring are not relatively rotated. In addition, it is not supported from both sides in the circumferential direction, and tends to concentrate in the direction of the impact load. For this reason, the indentation tends to be large (deep).

  As described above, when the test is performed using the test apparatus described in Patent Document 1 and when an impact load is applied to the wheel-supporting rolling bearing unit via the wheel during traveling of the automobile, Based on the difference in whether or not the hub is rotating with respect to the outer ring, a difference occurs in the shape of the indentation formed on the raceway surface. For this reason, in order to more accurately investigate the strength against the impact load applied to the wheel bearing rolling bearing unit while the vehicle is running, it is desirable to realize a structure that allows the test to be performed with the hub and the outer ring rotating relative to each other. It is.

Japanese Patent Application Laid-Open No. 07-329501 JP 2012-51393 A

  In view of the circumstances as described above, the present invention realizes a structure capable of evaluating the impact resistance of a wheel bearing rolling bearing unit in a state in which an outer diameter side race ring member and an inner diameter side race ring member are relatively rotated. The purpose is to do.

The wheel bearing rolling bearing unit testing apparatus according to the present invention includes a wheel supporting rolling bearing unit mainly composed of a lateral direction {axial direction, a traveling direction and a vertical direction of an automobile incorporating the wheel supporting rolling bearing unit (with respect to the road surface). In order to evaluate the impact resistance against the impact load applied in the direction perpendicular to the vertical direction) (perform an impact resistance test).
A wheel support rolling bearing unit to be subjected to an impact resistance test includes an outer diameter side race ring member, an inner diameter side race ring member, and a plurality of rolling elements.
Among these, the outer diameter side race ring member has a double row outer ring raceway on the inner peripheral surface.
The inner diameter side race ring member has a double row inner ring raceway on the outer peripheral surface, and is arranged concentrically with the outer diameter side race ring member on the inner diameter side of the outer diameter side race ring member.
Each of the rolling elements is provided between the outer ring raceways and the inner ring raceways so as to be capable of rolling plurally for each row.

And the test apparatus of the rolling bearing unit for wheel support of this invention is provided with a support means, a radial load provision means, an impact load provision means, and a rotation drive means.
Among these, the support means is a state in which one of the outer ring side ring member and the inner diameter side ring member is prevented from rotating around the central axis of the one ring member. Support with.
The radial load applying means applies a load in a direction perpendicular to the central axis of the one raceway ring member to the support means, and through this support means, the wheel support rolling bearing unit (the above-mentioned A radial load {a force corresponding to a road surface reaction force applied in a vertical direction (a direction perpendicular to the road surface in a use state)} is applied to the outer diameter side race ring member and the inner diameter side race ring member).
The impact load applying means applies an axial impact load to the wheel-supporting rolling bearing unit (between the outer diameter side race ring member and the inner diameter side race ring member). That is, the impact load applying means is configured such that the wheel supported by the wheel supporting rolling bearing unit rides on the curb, and the outer peripheral edge of the tire or the outer peripheral edge of the rim of the wheel. When an impact load is applied, an impact load corresponding to a lateral impact load applied to the wheel support rolling bearing unit is applied to the wheel support rolling bearing unit. Specifically, for example, an impact is applied to the wheel-supporting rolling bearing unit via the support means by hitting the support means using an actuator or the like. Or it can also comprise so that a hit | damage may be directly applied to said one track ring member.
The rotation driving means is for rotating and driving the other bearing ring member of the outer diameter side bearing ring member and the inner diameter side bearing ring member around the central axis of the other bearing ring member. A drive source such as an electric motor is provided.

  Preferably, when carrying out the test apparatus for a wheel bearing rolling bearing unit according to the present invention as described above, the impact load applying means is connected to the outer diameter side raceway ring member as in the invention described in claim 2. Of the inner diameter side raceway ring member, a member that is supported and fixed to the vehicle body in use (an outer ring in the case of the inner ring rotation type, and an inner diameter side member in the case of the outer ring rotation type) is attached to the vehicle body. The portion located above in the vertical direction is the force applied to the member supported and fixed to the vehicle body in this use state based on the radial load (the force corresponding to the road surface reaction force applied in the vertical direction in the use state). A state in which the action direction coincides with the front (the action direction of the force applied to the member that is supported and fixed to the vehicle body in the use state based on the radial load is the member of the member that is supported and fixed to the vehicle body in the use state. Mounting condition to In the vertical direction and matched state), it is to impart an impact load to the wheel supporting rolling bearing unit.

  If the test apparatus for a wheel support rolling bearing unit of the present invention configured as described above is used, the wheel support rolling is performed with the outer diameter side race ring member and the inner diameter side race ring member relatively rotated. The impact resistance test of the bearing unit can be performed. Therefore, the strength (impact resistance) against the impact load applied to the wheel bearing rolling bearing unit during traveling of the automobile can be known more accurately, for example, when the wheel rides on the curb.

The schematic diagram which shows the 1st example of embodiment of this invention. The figure which shows the state seen from the right side of FIG. The figure for demonstrating the method of performing the impact resistance test in the state which diverts the test apparatus of the 1st example of embodiment of this invention, and a hub and an outer ring are not rotating relatively. The schematic diagram which shows the 2nd example of embodiment of this invention. The figure which shows a radial load provision means. The figure for demonstrating the method of performing an impact resistance test in the state which diverts the test apparatus of the 2nd example of embodiment of this invention, and a hub and an outer ring are not rotating relatively. The schematic diagram which shows the 3rd example of embodiment of this invention. The schematic diagram which shows the 4th example of embodiment of this invention. The figure for demonstrating the method of performing an impact resistance test in the state which diverts a test apparatus similarly and a hub and an outer ring are not rotating relatively. The figure for demonstrating the state which performs an impact resistance test in the state where the hub and the outer ring are not rotating relative to each other. Sectional drawing which shows an example of the outer ring | wheel rotation type rolling bearing unit for wheel support used as the object of the test apparatus of this invention. Sectional drawing which shows an example of the conventional structure of the rolling bearing unit for wheel support of an inner ring | wheel rotation type.

[First example of embodiment]
1 and 2 show a first example of an embodiment of the present invention. The feature of the present invention including this example is to evaluate the impact resistance of the wheel bearing rolling bearing unit 1 in a state where the outer ring 2 and the hub 3 are relatively rotated (perform an impact resistance test). The structure of the test equipment. The structure of the wheel support rolling bearing unit 1 that is the object of this test apparatus is the same as the conventionally known wheel support rolling bearing unit including the structure shown in FIG. Omitted.

  The wheel support rolling bearing unit testing apparatus of this example includes a support means 9, a radial load applying means 10, an impact load applying means 11, and a rotation driving means 12. Among these, the support means 9 is for supporting the outer ring 2 in a state in which rotation around the central axis of the wheel-supporting rolling bearing unit 1 (coincident with the central axis of the outer ring 2 and the hub 3) is prevented. It is composed of a support base 13, a support column 14, a fixed side holding portion 15, and an arm portion 16. Of these, the support base 13 is supported and fixed to the floor surface 17. Further, the support column 13 is centered on a rotation direction around the center axis of the wheel support rolling bearing unit 1 and an axis orthogonal to the center axis of the wheel support rolling bearing unit 1 by the support base 13. Displacement in the axial direction of the wheel-supporting rolling bearing unit 1 (the direction in which the central axis of the outer ring 2 and the central axis of the hub 3 are inclined with respect to each other) is possible in a state where rattling in the rotational direction is suppressed. It is supported by. Further, the fixed side holding portion 15 is provided in a portion near the upper end of the column 14 and is a portion for supporting and fixing the outer ring 2 to the column 14. The arm portion 16 is provided in a state bent from the upper end portion of the support column 14.

  The radial load applying means 10 corresponds to a road surface reaction force applied in a vertical direction (a direction perpendicular to the road surface) between the outer ring 2 and the hub 3 via the support means 9 in use. It is for giving power. In the case of this example, specifically, in the use state of the wheel support rolling bearing unit 1 in the arm portion 16 (the state in which the wheel support rolling bearing unit 1 is incorporated in an automobile), the tire, the road surface, The anchor member 18 supported and fixed to a portion located immediately above the contact portion (grounding surface) is pressed downward.

  The impact load applying means 11 is for applying an axial impact load to the wheel support rolling bearing unit 1 through the support means 9 and is constituted by a double rod type hydraulic servo cylinder 19. Yes. That is, an impact load is applied to the wheel-supporting rolling bearing unit 1 through the support 14 by hitting the support 14 with the rod 20 of the hydraulic servo cylinder 19 (hitting the support 14).

  The rotation driving means 12 is for driving the hub 3 to rotate about the central axis of the wheel supporting rolling bearing unit 1, and includes a pedestal 21, a motor unit 22, a rotation supporting unit 23, an endless Belt 24. Of these, the pedestal 21 is installed (placed) on the floor surface 17 so as to be capable of horizontal position adjustment (position adjustment in the axial direction of the wheel bearing rolling bearing unit 1). That is, the pedestal 21 can move in the direction of the support column 14 by operating (turning) a horizontal position adjusting handle 35 of a horizontal position adjusting device 25 constituted by a feed screw mechanism or the like. A plurality of types of wheel bearing rolling bearing units 1 having different dimensions between the flange 6 and the rotation side flange 7 can be used. The motor unit 22 is configured by supporting and fixing an electric motor 26 as a driving source in a support frame 27, and is installed above the pedestal 21 so as to be movable up and down (position adjustment in the vertical direction is possible). . That is, the motor unit 22 is supported by the hub 3 by operating the vertical position adjusting handle 36 of the vertical position adjusting device 28 constituted by a feed screw mechanism or the like so as to be able to move up and down with respect to the base 21. It is made to correspond to a plurality of types of wheel bearing rolling bearing units 1 having different wheel tires and wheel outer diameters. Further, the rotation support unit 23 is a support bearing unit which is a double row rolling bearing unit {a back surface combination (DB) type angular ball bearing, a tapered roller bearing, etc.} with a preload applied to the rotating shaft 30 with respect to the housing 29. The motor unit 22 is rotatably supported and is detachably installed on the upper surface of the support frame 27 of the motor unit 22. A rotation-side holding portion 31 for supporting the hub 3 so as to be able to rotate in synchronization with the rotation shaft 30 is provided at the distal end portion (left end portion in FIG. 1) of the rotation shaft 30. The endless belt 24 includes a driving pulley 32 supported and fixed to the output shaft of the electric motor 26, and a driven pulley 33 supported and fixed to a base end portion (right end portion in FIG. 1) of the rotating shaft 30. It is spanned between. That is, the electric motor 26 enables the hub 3 supported on the tip of the rotary shaft 30 to be driven to rotate via the endless belt 24.

A method of performing an impact resistance test of the wheel bearing rolling bearing unit 1 using the test apparatus of this example as described above will be described below.
First, the outer ring 2 of the wheel supporting rolling bearing unit 1 is supported and fixed to a fixed side holding portion 15 provided near the upper end of the column 14. Specifically, by screwing a bolt (not shown) inserted through a through hole formed in the fixed side holding portion 15 into a screw hole formed in the stationary side flange 6 of the outer ring 2, and further tightening, After the fixed side holding portion 15 is supported and fixed to the outer ring 2, a screw hole formed in a portion of the fixed side holding portion 15 that is circumferentially removed from each through hole is attached to the column 14. The outer ring 2 is supported and fixed to the support 14 via the fixed side holding portion 15 by screwing and further tightening a bolt inserted through the formed through hole. Alternatively, the outer ring 2 can be configured to be supported and fixed by gripping (chucking) the outer peripheral surface of the outer ring 2. In addition, the outer ring 2 is fixed to the fixed side holding portion 15 so that the vertical direction of the outer ring 2 attached to the vehicle body matches the direction of the radial load applied by the radial load applying means 10. Support and fix. In the case of this example, specifically, the outer ring 2 is supported and fixed to the fixed-side holding portion 15 so that a portion positioned upward in the attached state to the vehicle body is vertically upward. Next, by operating the horizontal position adjustment handle 35 and the vertical position adjustment handle 36, the position of the rotation side holding portion 31 is changed to a dimension between the stationary side flange 6 and the rotation side flange 7, Then, the hub 3 of the wheel bearing rolling bearing unit 1 is supported and fixed to the rotating side holding portion 31 by adjusting according to the tire of the wheel supported by the hub 3 and the outer diameter of the wheel. Specifically, the nut is screwed into the serration hole formed in the rotation side flange 7 of the hub 3 (serration fitting), and the nut is screwed into the hub bolt inserted into the through hole formed in the rotation side holding portion 31. By further tightening, the hub 3 and the rotation side holding portion 31 are supported and fixed. Thereafter, a screw hole formed in the tip surface of the rotary shaft 30 is inserted into another through hole formed in a portion of the rotation side holding portion 31 that is circumferentially removed from each through hole. Then, the hub 3 is supported so as to be able to rotate in synchronization with the rotary shaft 30 with respect to the rotary shaft 30 via the rotary side holding portion 31. Also, the radial load applied by the radial load applying means 10 to the outer ring 2 is applied to the outer ring 2 by the force applied to the outer ring 2 based on the vertical road surface reaction force applied to the wheel in the use state. The position of the anchor member 18 is adjusted so as to coincide with the input position, and supported and fixed to the arm portion 16.

Then, by rotating the electric motor 26, the hub 3 supported by the rotation side holding portion 31 on the tip end portion of the rotating shaft 30 is rotated at a predetermined speed via the endless belt 24. At the same time, the radial load applying means 10 presses the arm portion 16 of the support column 14 downward with a predetermined force {for example, a force corresponding to half of the axle load (load applied to the axle)} to support the wheel. A radial load is applied to the rolling bearing unit 1.

  In this state, the strut 14 is hit by the rod 20 of the hydraulic servo cylinder 19 and an axial impact load is applied to the wheel bearing rolling bearing unit 1. That is, in the case of this example, the column 14 with respect to the support base 13 is in the axial direction of the wheel support rolling bearing unit 1 (the direction in which the central axis of the outer ring 2 and the central axis of the hub 3 are inclined to each other) It supports the displacement with respect to. Therefore, when the rod 20 is hit by the rod 20, an axial impact load is generated between the outer ring 2 supported and fixed to the column 14 and the hub 3 supported to the rotary shaft 30. Join. In the case of this example, the wheel of the automobile incorporating the wheel support rolling bearing unit 1 rides on the curb, and the outer peripheral edge of the tire and the outer peripheral edge of the rim of the wheel of these wheels. When an impact load is applied, it corresponds to an impact load in the lateral direction {perpendicular to the traveling direction of the automobile and the vertical direction (direction perpendicular to the road surface)} applied to the wheel bearing rolling bearing unit 1. An impact load is applied between the outer ring 2 and the hub 3. Thereafter, the rotation of the electric motor 26 is stopped, and the wheel-supporting rolling bearing unit 1 is taken out from the test apparatus. By disassembling and observing the wheel bearing rolling bearing unit 1, indentations are formed on the outer ring raceways 5, 5 and the inner ring raceways 8, 8 (see FIG. 12), or on the rolling surfaces of the balls 4, 4. It is determined whether or not damage such as a flaw has occurred. If an indentation or damage has occurred, the size and shape thereof are evaluated.

  According to the test apparatus for the wheel support rolling bearing unit of the present example as described above, the impact resistance test of the wheel support rolling bearing unit 1 is performed in a state where the outer ring 2 and the hub 3 are relatively rotated. Can be done. For this reason, the strength (impact resistance) against the impact load applied to the wheel supporting rolling bearing unit 1 during traveling of the automobile can be known more accurately, for example, when the wheel rides on the curb.

  In the case of this example, a double rod type hydraulic servo cylinder 19 is used as the impact load applying means 11 for applying an impact load to the wheel supporting rolling bearing unit 1. Therefore, when the displacement (absolute value) of the rod 20 is the same, the amount of pressure oil to be introduced into the hydraulic servo cylinder 19 is made the same regardless of the direction of displacement of the rod 20. I can do things. Therefore, the control of the servo valve (control valve) for controlling the movement of the rod 20 of the hydraulic servo cylinder 19 can be facilitated as compared with the case where a single rod type hydraulic servo cylinder is used. As a result, the input waveform of the impact load to the wheel supporting rolling bearing unit 1 can be easily regulated as desired. However, the impact load applying means 11 can be realized by a single rod type hydraulic servo cylinder or a pneumatic or electromagnetic actuator.

  The wheel bearing rolling bearing unit testing apparatus of this example supports the rotation support unit 23 so as to be detachable from the motor unit 22. Therefore, as shown in FIG. 3, the rotation support unit 23 is removed, and instead, the hub 3 is supported in a state in which the rotation around the central axis of the wheel support rolling bearing unit 1 is prevented. A hub fixing jig (equal) 37 is attached to the upper surface of the support frame 27 of the motor unit 22. In the example shown in the figure, the hub fixing jig 37 supports the hub 3 with its central axis arranged in the horizontal direction. However, the hub 3 is supported with respect to the horizontal direction in the central axis. It can also be configured to support in an inclined state. In any case, by using the hub fixing jig 37 instead of the rotation support unit 23, the wheel support rolling bearing in a state where the outer ring 2 and the hub 3 are not relatively rotated. The impact resistance test of the unit 1 can be performed. That is, the outer ring 2 is supported and fixed to the fixed side holding portion 15 of the support column 14, and the hub 3 is supported and fixed to the hub fixing jig 37. A radial load is applied between 2 and the hub 3. In this state, the strut 14 is hit by the rod 20 of the hydraulic servo cylinder 19 to apply an axial impact load between the outer ring 2 and the hub 3. When the impact resistance test of the wheel bearing rolling bearing unit 1 is performed by such a method, the impact is reduced by allowing the weight to fall freely as in the case of using the test apparatus described in Patent Document 1. Compared with the case where a load is applied and the damping characteristic of the impact load is adjusted by a pad made of vibration-proof rubber, the input waveform of the impact load can be easily regulated accurately as desired.

[Second Example of Embodiment]
4 to 6 show a second example of the embodiment of the present invention. The test apparatus of this example is configured to support and fix the hub 3 of the wheel bearing rolling bearing unit 1 to a fixed side holding portion 15a provided near the upper end of the support column 14a constituting the support means 9a. . Further, the outer ring 2 is supported by a rotation side holding portion 31a provided at the tip of the rotation shaft 30a of the rotation support unit 23a constituting the rotation driving means 12a. In the case of this example, the radial load applying means 10a is directly above the contact portion (ground contact surface) between the tire and the road surface in the use state of the wheel bearing rolling bearing unit 1 in the arm portion 16 of the support column 14a. A radial load is applied between the outer ring 2 and the hub 3 by elastically pulling the anchor member 18 supported and fixed to the portion located in the vertical direction upward. Specifically, as shown in FIG. 5, the anchor member 18 is lifted by a hoist type crane 34 through an elastic member 43 having a large elasticity such as a coil spring. An encoder 38 is fixed concentrically with the rotary shaft 30a at a portion near the base end of the rotary shaft 30a. Then, based on the output signal of a sensor (not shown) having the detection portion opposed to the detection surface of the encoder 38, the portion located above in the state where the outer ring 2 is attached to the vehicle body is the radial load applying means 10. The moment when the force applied to the outer ring 2 is applied forward (downward in FIGS. 4 to 5) based on the vertical load applied by the motor (positioned above the outer ring 2 in an attached state to the vehicle body) At the moment when the portion is vertically downward), the hydraulic servo cylinder 19 strikes the column 14a.

According to this example, the impact load is applied to the wheel support rolling bearing unit 1 from the hub 3 side in the same manner as when an impact load is applied by driving a wheel on the curb while the vehicle is running. You can enter it.
In the case of this example, a vertical load is applied to the wheel-supporting rolling bearing unit 1 by lifting the column 14a on which the hub 3 is supported and fixed by the hoist crane 34. For this reason, by applying an impact load to the wheel support rolling bearing unit 1, even when the wheel support rolling bearing unit 1 is damaged, the support column 14a can be prevented from collapsing, and the safety of the impact resistance test can be prevented. Can be improved.

In the case of this example as described above, as shown in FIG. 6, the rotation support unit 23 a is removed, and instead, the outer ring 2 is centered on the central axis of the wheel support rolling bearing unit 1. If an outer ring fixing jig (equal) 39 for supporting the rotation in a blocked state is attached to the upper surface of the support frame 27 of the motor unit 22, the outer ring 2 and the hub 3 are not rotated relative to each other. The impact resistance test of the wheel bearing rolling bearing unit 1 can be performed.
The configuration and operation of the other parts are the same as in the first example of the embodiment described above.

[Third example of embodiment]
FIG. 7 shows a third example of the embodiment of the present invention. The test device of this example supports and fixes a knuckle 40 constituting a suspension device and a back plate 48 constituting a braking device to a stationary side flange 6 of an outer ring 2 of a wheel bearing rolling bearing unit 1. The support means 9b is configured to be supported and fixed to a portion near the upper end of the support column 14b. Further, a wheel 41 constituting a wheel and a rotor 42 serving as a braking rotating member constituting the braking device are supported and fixed to the rotation side flange 7 of the hub 3, and the wheel 41 is rotated to constitute the rotation driving means 12b. The support unit 23b is supported by a rotation side holding portion 31b provided at the tip of the rotation shaft 30b. In the case of this example, since the specimen is composed of the wheel-supporting rolling bearing unit 1, the knuckle 40 and the back plate 48, the wheel 41 and the rotor 42, the rigidity of the specimen as a whole is determined. As in the first example of the above-described embodiment, the wheel support rolling bearing unit 1 can be made smaller than a single specimen. That is, the elastic modulus of the specimen can be reduced, and the input waveform of the impact load can be easily regulated more accurately.
The configuration and operation of the other parts are the same as in the first example of the embodiment described above.

[Fourth Example of Embodiment]
8 to 10 show a fourth example of the embodiment of the present invention. In the case of this example, a wheel 41 constituting the wheel and a rotor 42 as a braking rotating member are supported and fixed to the rotation side flange 7 of the hub 3 of the wheel bearing rolling bearing unit 1, and a rim portion constituting this wheel 41 is configured. A hook 45 provided at the tip of a hoist crane 34 (see FIG. 3) is hooked on the upper end of 44. Then, by lifting the wheel 41 by the hoist type crane 34, the hub 3 is supported in a state where rotation about the central axis of the wheel support rolling bearing unit 1 is prevented, and this wheel support A vertical load is applied to the rolling bearing unit 1. That is, in the case of this example, the hoist type crane 34 functions as support means 9c for supporting and fixing the hub 3, and also functions as radial load applying means 10b. Further, the impact load applying means 11 a is configured to directly hit the lower end portion of the rim portion 44 of the wheel 41 by the rod 20 of the hydraulic servo cylinder 19. That is, in the case of this example, an impact load can be applied from the lower end portion of the rim portion 44 of the wheel 41, which is an input portion of the impact load when the wheel rides on the curb.

Also in this example, as shown in FIG. 9, the rotation support unit 23 for rotatably supporting the outer ring 2 is removed. Instead, the outer ring 2 is connected to the central axis of the wheel bearing rolling bearing unit 1. If an outer ring fixing jig 39 for supporting in a state in which rotation around the center is prevented is attached to the upper surface of the support frame 27 of the motor unit 22, the outer ring 2 and the hub 3 are not relatively rotated. The impact resistance test of the wheel bearing rolling bearing unit 1 can be performed. Alternatively, as shown in FIG. 10, the outer ring 2 cannot be rotated around the central axis of the wheel support rolling bearing unit 1, and the central axis is at a predetermined angle (for example, 13 ± 1) with respect to the horizontal plane. It is also possible to use an outer ring fixing jig 39a that is supported in an inclined state. In this case, a vertical load is applied to the wheel- supporting rolling bearing unit 1 by the weights of the hub 3 and the wheels 41 and the rotor 42.
Other configurations and operations are the same as those in the first and second examples of the above-described embodiment.

The wheel bearing rolling bearing unit testing device of the present invention can be applied to any of an inner ring rotating type and an outer ring rotating type, regardless of whether it is for a driven wheel or a driving wheel (solid or hollow). . For example, FIG. 11 shows a structure described in Patent Document 2 as an example of a wheel bearing rolling bearing unit of an outer ring rotating type. The wheel support rolling bearing unit 1a includes an inner diameter side race ring member 46, an outer diameter side race ring member 47, and balls 4a and 4a, each of which is a rolling element. Among these, the inner diameter side race ring member 46 has double rows of inner ring raceways 8a and 8a on the outer peripheral surface, and through holes formed in the constituent members of the suspension device such as a knuckle at a plurality of locations in the circumferential direction of the inner end surface. A screw hole (not shown) for supporting and fixing the inner diameter side race ring member 46 is provided in the suspension device by screwing the inserted bolt and further tightening. The outer diameter side race ring member 47 has double row outer ring races 5a, 5a on the inner peripheral surface, and a rotation side flange 7a for supporting and fixing the wheel on the outer peripheral surface. Each of the balls 4a, 4a is provided between the outer ring raceways 5a, 5a and the inner ring raceways 8a, 8a so as to be freely rollable in each row.

DESCRIPTION OF SYMBOLS 1, 1a Rolling bearing unit for wheel support 2 Outer ring 3 Hub 4, 4a Ball 5, 5a Outer ring raceway 6, 6a Stationary side flange 7, 7a Rotation side flange 8, 8a Inner ring raceway 9, 9a, 9b, 9c Support means 10, 10a, 10b Radial load applying means 11, 11a Impact load applying means 12, 12a, 12b Rotation drive means 13 Support bases 14, 14a, 14b Posts 15, 15a Fixed side holding portion 16 Arm portion 17 Floor 18 Anchor member 19 Hydraulic servo Cylinder 20 Rod 21 Pedestal 22 Motor unit 23, 23a, 23b Rotation support unit 24 Endless belt 25 Horizontal position adjustment device 26 Electric motor 27 Support frame 28 Vertical position adjustment device 29 Housing 30, 30a, 30b Rotating shaft 31, 31a, 31b Rotation Side holding part 32 Drive side pulley 33 Drive side pulley 34 Hoist type crane 35 Horizontal position adjustment handle 36 Vertical position adjustment handle 37 Hub fixing jig 38 Encoder 39, 39a Outer ring fixing jig 40 Knuckle 41 Wheel 42 Rotor 43 Elastic member 44 Rim part 45 Hook part 46 Inner side track Ring member 47 Outer diameter side race ring member 48 Back plate

Claims (2)

An outer diameter side race ring member having a double row outer ring raceway on the inner peripheral surface;
An inner ring raceway member that has a double row inner ring raceway on the outer peripheral surface and is arranged concentrically with the outer diameter raceway member on the inner diameter side of the outer diameter raceway member;
A wheel support for testing the impact resistance of a rolling bearing unit for supporting a wheel, comprising: a plurality of rolling elements provided in a plurality of rolling elements for each row between the outer ring raceways and the inner ring raceways. A rolling bearing unit testing device for
A support means for supporting one of the outer ring-side bearing ring member and the inner diameter-side bearing ring member in a state in which rotation around the central axis of the one bearing ring member is prevented;
By applying a load in a direction perpendicular to the central axis of the one bearing ring member to the support means, a radial load is applied via the support means to apply a radial load to the wheel support rolling bearing unit. Means,
An impact load applying means for applying an impact load to the wheel supporting rolling bearing unit;
A wheel support comprising: a rotational drive means for rotationally driving the other bearing ring member of the outer diameter side bearing ring member and the inner diameter side bearing ring member around the central axis of the other bearing ring member. Testing equipment for rolling bearing units.   The impact load applying means is positioned above the outer diameter side bearing ring member and the inner diameter side bearing ring member in the vertical direction in a mounting state of the member that is supported and fixed to the vehicle body in use. The portion to be applied gives an impact load to the wheel-supporting rolling bearing unit in a state where the portion to be applied coincides with the forward direction of the force applied to the member supported and fixed to the vehicle body in the use state based on the radial load. A test apparatus for a rolling bearing unit for supporting a wheel according to claim 1.

Images