KR102149428B1 - Continual inspection method for axle assembly and inspection apparatus thereof - Google Patents

Abstract

The present invention relates to an axle assembly inspection apparatus and an intermittent inspection method thereof. According to the present invention, the axle assembly inspection apparatus comprises a prepressure forming operation unit, a runout and starting torque measuring operation unit, a shaft shaking measuring operation unit, and a prepressure releasing operation unit, all of which are independently placed to be distanced from each other for a certain length. An inspection process of the axle assembly is conducted independently and intermittently (the process is divided by feature and is conducted intermittently), thereby remarkably increasing production efficiency. In addition, the runout, starting torque, and shaft shaking of the axle assembly can be measured with a high measurement reliability. Even for an axle assembly with a different size and measurement position in accordance with the vehicle type, the prepressure forming operation unit and the prepressure releasing operation unit are made in independent jig structures. Accordingly, various sorts of mixed-type products can be inspected without changing the structure, and the axle assembly inspection apparatus is particularly proper for mass-production of the axle assembly.

Description

Axle assembly inspection device and its intermittent inspection method {CONTINUAL INSPECTION METHOD FOR AXLE ASSEMBLY AND INSPECTION APPARATUS THEREOF}

The present invention relates to an axle assembly inspection apparatus and an intermittent inspection method thereof, and more particularly, a preload forming operation unit, a runout and starting torque measurement operation unit, a shaft shake measurement operation unit, and a preload release operation unit are independently arranged and spaced apart. The axle assembly inspection device capable of intermittently and continuously performing the inspection process on the axle assembly, thereby remarkably improving production efficiency, high measurement reliability, and capable of inspecting multiple types of mixed products, and an intermittent inspection method thereof. .

In general, the axle assembly for a vehicle is coupled to a driving wheel and a driven wheel of a vehicle to minimize frictional resistance of the vehicle to smoothly rotate and to support the load of the vehicle.

A typical structure of the front axle assembly 100 is, as shown in FIG. 9, a hub 105 to which the brake disk 104 is coupled by a plurality of hub bolts 106, and an outer periphery of the hub 105 And the angular contact ball bearing 103 interposed between the inner race 103a and the outer race 103b, and the angular contact ball bearing 103 to the hub 105 through the angular contact ball bearing 103 It consists of a knuckle 101 that is coupled.

An axle (not shown) is spline-coupled to the hub 105, and the angular contact ball bearing 103 enables smooth rotation while minimizing friction of the wheel and supports the load of the vehicle, and the knuckle 101 While supporting the angular contact ball bearing 103, it enables the vehicle to move straight forward and turn.

In the drawings, reference numeral 102, which is not described, is a snap ring for preventing the angular contact ball bearing 103 from being separated, and 107 is a dust cover for preventing the inflow of foreign matter.

Since the assembled vehicle axle assembly 100 is supplied to a vehicle manufacturer and used for manufacturing a finished vehicle, a preliminary inspection of the assembled module is performed.

The inspection of the vehicle axle assembly 100 consists of measuring run out, starting torque, and axial play.

Run out is the distance that the centerline moves when the wheel is rotated once while the wheel axle of the vehicle is fixed. In the field, the vertical and horizontal vibrations are respectively radial. It is called runout (RRO) and lateral runout (LRO).If the brake disk is outside the specified range, the cause of judder (a phenomenon in which the frictional force of the friction piece in the brake is not constant, causing vibration or noise) is caused. It is also possible.

Meanwhile, as shown in FIG. 9, the angular contact ball bearings 103 in the axle assembly 100 are arranged in two rows between the two-piece inner race 103a and the one-piece outer race 103b, and the inner race ( It is a structure that automatically centers when an axial force is applied from the top and bottom directions of 103a), and the pressure required for automatic centering of the angular contact ball bearing 103 is called pre-loading.

Starting torque prevents the rotation of the outer race 103b when the inner race 103a rotates by the friction force on the contact surface between the angular contact ball bearing 103 and the inner race 103a and the outer race 103b. As the initial reaction force value, when the preload increases and the inner surface (contact surface) of the angular contact ball bearing 103 or the inner/outer races 103a, 103b is damaged, the frictional force on the contact surface increases and the inner race 103a ) During rotation, the phenomenon that the outer race 103b also rotates along with the rotation becomes stronger.

The runout and starting torque are measured while a preload is applied to the angular contact ball bearing.

Axial play is the amount of displacement when a predetermined force is applied to the knuckle (shaft shake), and if the preload on the angular contact ball bearing cannot be applied for some reason and the center is not properly centered, a serious defect is created that causes the front wheel to shake. do.

Therefore, the assembled axle assembly 100 is applied to runout, starting torque, and shaft shake to check whether the quality of the disc brake 104 and the knuckle 101 shakes during rotation, the machining degree between parts, and the assembly state. The measurement is made.

Typical conventional techniques for a device or method for measuring runout of an axle assembly include the following.

Registered Patent No. 0986722 (2010.10.04.) is a runout of a disk assembly including a main body, a disk assembly loading unit, a disk assembly elevating movement unit, a knuckle support unit, a disk rotation unit, and a plurality of measurement units. A measuring device is proposed.

However, the prior art is a device for increasing the reliability of runout measurement by supporting the knuckle firmly and accurately horizontally, and does not have a structure in which a preload is applied while simultaneously measuring runout.

On the other hand, Patent No. 1183766 (2012.09.11.), as shown in Figure 10, the axle assembly for measuring the runout of an axle assembly consisting of a disk (2), a hub bearing (4) and a knuckle (6) A runout measuring apparatus, comprising: a rotary table (20) supporting the axle assembly and rotating by power of a drive unit; The axle assembly is moved up and down vertically according to the drive of the lifting cylinder 22 while passing through the rotary table 20 and is pushed up in a state in close contact with the lower surface of the hub bearing 4 of the axle assembly. ) And a bolt 26 spaced apart by a certain distance; A knuckle fixing unit 30 for clamping the knuckle 6 of the axle assembly; A driving means (54) installed above the rotary table (20) and vertically moving by the power of the descending cylinder (50); A socket 58 coupled to the shaft 56 of the driving means 54; The power of the driving means 54 in a state that is detachably fitted to the socket 58 and is fitted to the tip of the bolt 26 exposed to the upper surface of the rotary table 20 according to the driving of the descending cylinder 50 It is rotated by the screw thread of the bolt 26 and is fastened and composed of a nut 60 for compressing the upper surface of the hub bearing 4; In the axle assembly, the hub bearing 4 is rotated in a state in which only the hub bearing 4 is pressed with a predetermined pressure through the nut 60 and the bolt 26 to measure the runout of the axle assembly through a measuring means. The runout measuring device is being opened.

In the drawings, reference numerals 6a and 6b denote a wing, 15 a housing, 32 and 44 a clamping arm, 34 an air cylinder, 36 a rod, 38 a shaft, 42 a hinge, and 52 a vertical moving platform.

However, in the conventional runout measuring device, in applying a preload to the hub bearing 4 by the bolt 26 and the nut 60, all the work of tightening the nut 60, performing various measurements, and loosening the nut 60 again Since it is performed in situ in one position, productivity is inferior (working time takes 50 seconds), and a preload is applied to the hub bearing (4) when measuring shaft shake, so that the rotating shaft of the axle assembly is firmly fixed. In this state, the displacement value should be measured by applying force from the outside of the knuckle (6), but since the lifting cylinder (22) and the rotary table (20) are located below the axle assembly, the rotary shaft is displaced by the clamping arms (32, 44). It is not easy to deviate from the axis of (20), as well as a gap occurs when the bearings inside the rotary table (20) and the bolt (60) are worn, so that the measurement accuracy is inaccurate, and it is a device for fixing the knuckle (6). Arms 32 and 44 are used, and the axle assembly differs in size and position of parts for each vehicle model, but there is a problem that it takes cost and time to remodel because of incompatibility, and it is impossible to measure mixed flow for various models.

Korean Registered Patent Publication No. 1183766 (registered on September 11, 2012) Korean Registered Patent Publication No. 1183766 (registered on September 11, 2012)

The first object of the present invention is to provide an axle assembly inspection apparatus capable of remarkably increasing production efficiency by intermittently performing an inspection process for an axle assembly.

A second object of the present invention is to provide an axle assembly inspection apparatus capable of measuring runout, starting torque, and shaft shake for an axle assembly with high measurement reliability.

A third object of the present invention is to provide an axle assembly inspection apparatus capable of inspecting multi-model mixed products without structural change.

A fourth object of the present invention is to provide an intermittent inspection method of an axle assembly with remarkably improved production efficiency and measurement reliability using an axle assembly inspection apparatus according to the above-described various objects.

According to a preferred aspect of the present invention for smoothly achieving the first to third objects of the present invention, an upper nut runner rotatably driven to which a nut is clamped, and a lower sliding shaft having a threaded portion formed at the upper outer periphery are fixed. A preload forming operation unit and a preload release operation unit of the same structure including a unit and forming or releasing pre-loading in the angular contact ball bearing of the axle assembly by fastening or disengaging the nut and the shaft; A hydraulic unit for clamping and lifting the arm of the knuckle of the axle assembly in a preloaded state, an upper driving unit installed to enable lifting and rotational movement, and the hub and disk brake of the axle assembly in a preloaded state by the driving unit. A run-out and starting torque measurement operation unit that measures run-out and starting torque while rotating; An upper clamping unit and a lower clamping unit for fixing the shaft, and an axial play measuring operation unit for applying a biasing external force vertically downward to the knuckle of the axle assembly in a stationary state and measuring a displacement amount from the opposite side: the preload An axle assembly inspection apparatus is provided in which a forming operation unit, a runout and starting torque measurement operation unit, a shaft shake measurement operation unit, and a preload release operation unit are sequentially arranged at a predetermined distance apart.

The preload forming operation unit, the runout and starting torque measurement operation unit, the shaft shake measurement operation unit, and the preload release operation unit may be sequentially arranged linearly or circularly arranged on a turntable.

A nut socket and a shaft socket are respectively mounted on the nut runner and the sliding unit of the preload forming operation unit and the preload release operation unit; The preload forming operation part penetrates the hub shaft hole of the axle assembly by rising of the sliding unit while the shaft is coupled to the shaft socket and the nut is clamped to the nut socket, and at the same time, by lowering and rotating the nut runner. Applying a predetermined preload to the angular contact ball bearing of the axle assembly by tightening the nut to the screw portion of the shaft; The preload release operation unit releases the preload by disengaging the nut and the shaft coupled to the axle assembly from the threaded portion of the shaft by lowering and reverse rotation of the nut runner.

Meanwhile, the shaft may have a flange formed at a lower portion thereof, and a lower portion of the flange may be formed in a polygonal portion to enable a solid fixation by a shaft socket.

In addition, a notch-shaped upper and lower concave portions are formed on the shaft, and the upper clamping unit and the lower clamping unit of the shake measurement operation unit are formed as wedge-shaped distal ends, so that they can be interlocked and fixed.

The runout and starting torque measurement runout measurement of the operating unit is performed by a runout measurement sensor located directly on at least the lower surface of the peripheral end of the rotating disc or a predetermined distance apart, and the starting torque measurement is performed by measuring the starting torque installed in the drive unit. Made by sensors.

According to a preferred aspect of the present invention for smoothly achieving the fourth object of the present invention, (A) passing through the shaft with a threaded portion formed on the upper outer periphery from the lower side in the shaft hole of the hub of the introduced axle assembly and fastening the nut from the upper A provisional assembly step; (B) a preload forming step of fixing the shaft of the temporarily assembled axle assembly with a sliding unit and fastening the nut by downward rotation of the nut runner to apply and maintain a predetermined pre-loading to the angular contact ball bearing of the axle assembly; (C) After clamping the arm of the knuckle of the axle assembly in the preloaded state with a hydraulic unit, lifting it and fixing it, runout while rotating the hub and the disc brake of the axle assembly in the preloaded state by a drive unit that is installed for lifting and rotating motion. a run-out and starting torque measurement step of measuring a run out and a starting torque; (D) a shaft shake measurement step of automatically transferring the axle assembly in a preloaded state, fixing the upper and lower ends of the shaft, applying a deflecting external force vertically downward to the knuckle of the axle assembly in a non-rotating stop state, and measuring a displacement amount from the opposite side; (E) a preload release step of releasing the preload by releasing the nut fastened to the upper end of the shaft penetrating the hub shaft hole of the axle assembly on which the measurement has been completed; (F) Provided is an intermittent inspection method of an axle assembly including a take-out step of separating and collecting a shaft and a nut from a preloaded axle assembly and discharging the axle assembly.

Here, steps (A) to (F) may be intermittently repeatedly performed continuously.

The nut and shaft removed in the take-out step (F) may be reused in the temporary assembly step (A).

According to the axle assembly inspection apparatus and its intermittent inspection method according to the present invention, it is possible to significantly increase production efficiency by independently and intermittently performing the inspection process for the axle assembly (processes are separated by characteristics and intermittently performed). In addition, it is possible to measure runout, starting torque, and shaft shake for the axle assembly with high measurement reliability, and even for axle assemblies with different sizes and measurement positions depending on the vehicle model, the preload formation and release operation units are independently configured without structural changes. It has the advantage of being particularly suitable for mass production of axle assemblies, as it is possible to inspect products of mixed models.

1 and 4 are schematic cross-sectional views of a preload forming and releasing operation part of an axle assembly inspection apparatus according to the present invention, respectively.
2 is a schematic cross-sectional view of an operation unit for measuring runout and starting torque of the axle assembly inspection apparatus according to the present invention.
3 is a schematic cross-sectional view of an axle shake measurement operation unit of the axle assembly inspection apparatus according to the present invention.
5 is a flowchart illustrating an intermittent inspection method of an axle assembly according to the present invention.
6 is a perspective view showing an axle assembly inspection apparatus according to the present invention.
7 is a partially omitted side view of FIG. 6.
8 is a plan view illustrating the operation of the axle assembly inspection apparatus according to the present invention.
9 is a structural cross-sectional view of a general front axle assembly.
10 is a longitudinal cross-sectional view of a conventional axle assembly runout measuring device.

The term “intermittent or continuous” as used throughout this specification refers to the preload formation step, runout and starting torque measurement step, the shaft shake measurement step, and the preload release step sequentially in one position. It is not performed, but is performed simultaneously and independently at positions spaced apart by a predetermined distance, and while each step is performed independently and at the same time, the automatic transfer of the axle assembly is stopped and cut, but after each step is completed, the axle assembly is automatically transferred to the next step. It is defined as meaning that the process of becoming is performed continuously and repeatedly.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a schematic cross-sectional view of a preload forming operation unit 10 of an axle assembly inspection apparatus according to the present invention, wherein the preload forming operation unit 10 is a runout and starting torque measurement operation unit 20 to be described later, and a shaft shake measurement As an independent jig device separate from the operation part, the nut socket 12 clamping the nut 13 is mounted on the lower side, and the upper (servo) nut runner 11 installed to enable lifting and rotational movement, and the upper part A shaft socket 14 for fixing the shaft 16 on which the threaded portion 16c is formed at the periphery is mounted on the upper side and includes a lower sliding unit 15 that is installed so as to move up and down.

The preload forming operation unit 10 preloads the angular contact ball bearing 103 which is forcibly press-fitted between the knuckle 101 and the hub 105 of the axle assembly 100 introduced by a conveying means (not shown). For pre-loading), the shaft 16 fixed to the shaft socket 14 mounted on the upper end thereof by the lifting of the sliding unit 15 located under the axle assembly 100 is the shaft hole of the hub 105 ( 6), the nut 13 clamped to the socket 12 mounted thereon is tightened by lowering and rotating the nut runner 11 positioned above. .

By fastening and tightening the nut 13 to the shaft 16, the inner race of the axle assembly 100 (see reference numeral 103a in FIG. 6) is pushed in the axial direction and a predetermined preload on the angular contact ball bearing 103 By forming the rotation body hub 105 and the center of the disk brake 104 is not shaken.

Meanwhile, the shaft 16 may have a flange 16a formed at the bottom thereof, and the shaft 16 rotates along the nut 13 when the nut 13 is tightened to the threaded portion 16c of the shaft 16. The lower cross section adjacent to the flange 16a may be formed as a polygonal portion 16b such as a quadrangle or hexagonal shape so that it can be firmly fixed to the shaft socket 14 without.

In addition, the shaft 16 is formed with a notched upper concave portion 16d and a lower concave portion 16e, and the upper clamping unit 32 of the shaft shake measurement operation unit 30 to be described later in FIG. It is formed so as to securely fix the shaft 16 by contacting the wedge-shaped tip portion (not shown) formed in the lower clamping unit 31.

2 is a schematic cross-sectional view of the runout and starting torque measurement operation unit 20 of the axle assembly inspection apparatus according to the present invention, wherein the runout and starting torque measurement operation unit 20 is a predetermined distance from the preload forming operation unit 10 It is located at a distance and firmly clamps the clamping position indicated by reference numeral 26 to the arm (not shown) of the knuckle 101 of the axle assembly 100 in a preloaded state that has been transported by a transport means (not shown). Then, a hydraulic unit (not shown) for lifting the axle assembly 100 to float in the air and a socket part 22 for clamping the nut 13 are mounted on the lower side and installed to enable lifting and rotating movements. A displacement sensor (LVDT) located below or below the drive unit 21 of the drive unit 21, the starting torque measurement sensor 25 installed in the drive unit 21, and the disc brake 104 of the axle assembly 100: Linear Variable Differential Transfomer), specifically, a runout measurement sensor (contact type displacement sensor) 24 or a runout measurement sensor (non-contact displacement sensor) 23.

Runout and starting torque are measured by firmly clamping the clamping position indicated by reference numeral 26 to the knuckle 101 of the axle assembly 100 by a hydraulic unit (not shown), and then lifting the axle assembly 100 into the air. Then, when the drive unit 21 is rotated to rotate the disk brake 104, the disk brake 104 and the hub 105 are also rotated. At this time, the lower side of the outer peripheral end of the rotating disk brake 104 The runout measurement sensor 24 is directly contacted to detect the height difference, or the runout measurement sensor 24 is positioned at a predetermined distance below the outer circumferential end of the disc brake 104 and then the height difference using a laser beam. At the same time as the runout is measured by sensing the starting torque, the starting torque is measured using the starting torque measuring sensor 25 installed in the driving unit 21.

In addition, when the hub 105 starts to rotate by the drive unit 21, the rotational force is also applied to the knuckle 101 forced into the outer race (see reference numeral 103b in FIG. 6) by the preload of the angular contact ball bearing 103. However, since the knuckle 101 is firmly fixed by a hydraulic unit (not shown), the initial rotation of the drive unit 21 receives resistance, and at this time, the starting torque measurement sensor 25 installed in the drive unit 21 ) Is used to detect the reaction force value and calculate and measure it as the maneuvering force.

In addition, although not shown, it is of course possible to inspect the displacement of the upper surface of the disk by placing the displacement sensor on or above the upper surface of the disk brake 104.

3 is a schematic cross-sectional view of the axis shaking measurement operation unit 30 of the axle assembly inspection apparatus according to the present invention, the axis shaking measurement operation unit 30 is spaced a predetermined distance from the runout and starting torque measurement operation unit 20 The axle assembly in a preloaded state that has been transferred by a transfer unit (not shown) after rising of the upper clamping unit 32 of the runout and starting torque measurement operation unit 20 and the lowering of the lower clamping unit 31 ( It includes an upper clamping unit 32 and a lower clamping unit 31 for firmly fixing the shaft 16 coupled to 100) again.

Shaft shake measurement The shaft shake measurement of the operation unit 30 is performed by applying an external force specified to the knuckle 101 in the direction of the red arrow (vertical direction) shown on the drawing while the axle assembly 100 is not rotating. The amount of displacement is measured by contacting the shaft shake measurement sensor 33 with the portion opposite to the applied portion, thereby determining whether the preload state is properly achieved.

4 is a schematic cross-sectional view of the preload release operation unit 40 of the axle assembly inspection apparatus according to the present invention, the configuration of which is the same as the preload forming operation unit 10 described above, and in the reverse order of its operation, the axle assembly 100 ) The nut 13 and the shaft 16 coupled to the (servo) nut runner 11 from the screw portion 16c formed on the upper outer periphery of the shaft 16 by reverse rotation after the lowering of the nut runner 11 The preload is released by releasing the fastening, and the nut runner 11 rises with the nut 13 clamped, and the sliding unit 15 descends with the shaft 16 fixed, and the inspection completed axle The assembly 100 is taken out and sent to a finished vehicle manufacturer.

Prior to the description of the intermittent inspection method of an axle assembly according to the present invention of FIG. 5, a brief description will be made using a perspective view and a partially omitted side view of the axle assembly inspection apparatus 1 according to the present invention of FIGS. 6 and 7 .

In the illustrated example, the axle assembly inspection apparatus 1 according to the present invention includes a preload forming operation unit 10, a runout and starting torque measurement operation unit 20, a shaft shake measurement operation unit 30, and a preload release operation. Although the part 40 shows a preferred example of a rotary table type in which the part 40 is arranged in a circular shape with a predetermined interval sequentially at the edge of the turn table 2, it is of course possible to arrange it in a linear manner.

In the illustrated axle assembly inspection apparatus 1 according to the present invention, a turn table 2 supported by a supporter 5 is located in the center of the base plate 3, and the preload forming operation unit 10, the runout and the The starting torque measurement operation unit 20, the shaft shake measurement operation unit 30, and the preload release operation unit 40 are respectively installed on the post 4.

Meanwhile, the preload forming operation unit 10 and the preload release operation unit 40 have completely the same configuration.

Next, an intermittent inspection method of an axle assembly according to the present invention will be described with reference to FIGS. 6 and 8.

The intermittent inspection method of an axle assembly according to the present invention includes the following steps.

(A) Temporary assembly step/takeout step (S1):

A shaft 16 having a threaded portion 16c formed at an upper outer periphery of the hub 105 of the introduced axle assembly 100 penetrates the shaft 16 from the lower side and fastens the nut 13 from the upper side to temporarily assemble.

In addition, the shaft 16 and the nut 13 are separated from the inspected axle assembly 100, recovered, and discharged, and a new axle assembly 100 is introduced.

Here, the axle assembly 100 is introduced and discharged at the same time.

(B) Preload formation step (S2):

The shaft 16 is fixed to the shaft socket 14 mounted on its upper end by the rising of the sliding unit 15, and clamped to the socket 12 mounted thereto by lowering and rotating the nut runner 11 The nut 13 in the pre-assembled state is tightened with a prescribed tightening force (up to 4000 Kg) to apply a predetermined preload to the angular contact ball bearing 103 of the axle assembly 100 and maintain it, and then transfer it after changing the direction to the runout test position.

(C) Runout and starting torque measurement steps:

The axle assembly 100 in the preloaded state is automatically transferred, the arm of the knuckle 101 (not shown) is clamped and lifted with a hydraulic unit (not shown), and then the hub 105 of the axle assembly 100 and the While rotating the disk brake 104 (420 rpm), runout and starting torque are measured.

(D) Shaft shake measurement steps:

After automatically transferring the axle assembly 100 in a preloaded state and fixing the upper and lower ends of the shaft 16, an external force of an unbalanced load is applied vertically downward to the knuckle 101 of the axle assembly 100 in a non-rotational stop state. Measure the amount of displacement from the opposite side to measure shaft shake.

(E) Preload release step:

After the nut 13 fastened to the upper end of the shaft 16 penetrating the shaft hole 105a of the hub 105 of the axle assembly 100 that has been measured, is released from the shaft 16 to release the preload state, Transfer to the (A1) introduction/discharge step (S1).

Above, the steps (A) to (E) are repeatedly performed intermittently and continuously at the same time, and the shaft 16 and the nut 13 are reused.

On the other hand, runout, starting torque, and shaft shake measurements are stored in the PC, nut runner torque is stored, and information is transmitted to a barcode printer.

In the axle assembly inspection apparatus and the intermittent inspection method thereof according to the present invention, preload formation, runout and starting torque measurement, shaft shake measurement, and preload release steps are not sequentially performed in situ at one position, but these After each step is performed independently, the turntable moves to the next step by intermittent rotation, and at the same time, the introduced axle assembly to be inspected and the axle assembly that has been inspected are intermittently linearly transported, dramatically increasing production efficiency by 2 to 4 times. In addition, it has high measurement reliability, and even for axle assemblies with different sizes and measurement positions depending on the vehicle type, the preload forming and release operation unit is configured with an independent jig structure, allowing inspection of multi-model mixed products without structural changes, allowing the axle assembly. It is particularly suitable for mass production of

1: axle assembly inspection apparatus according to the present invention
2: turn table 3: base plate
4: Post 5: Support
10 (40): pre-loading (release) operation unit
11: nut runner 12: nut socket
13: nut 14: shaft socket
15: sliding unit 16: shaft
16a: flange 16b: polygon
16c: threaded portion 16d: upper recessed portion
16e: lower recess
20: Run out and starting torque measurement operation unit
21: drive unit 22: socket
23: runout measurement sensor (non-contact displacement sensor)
24: runout measurement sensor (contact type displacement sensor) 25: starting torque measurement sensor
26: clamping position
30: axial play measurement operation unit
31: lower clamping unit 32: upper clamping unit
33: Shaft shake measurement sensor
100: axle assembly
101: knuckle 102: snap ring
103: angular contact ball bearing
103a: inner race 103b: outer race
104: disc brake 105: hub
105a: shaft hole 106: hub bolt
107: dust cover

Claims (9)

It includes an upper nut runner capable of rotationally driving the nut is clamped, and a lower sliding unit in which a shaft having a threaded portion formed at the upper outer periphery is fixed, and a preload on the angular contact ball bearing of the axle assembly by fastening or releasing the nut and the shaft ( a preload forming operation unit and a preload release operation unit having the same structure for forming or releasing pre-loading);
A hydraulic unit for clamping and lifting the arm of the knuckle of the axle assembly in a preloaded state, an upper driving unit installed to enable lifting and rotational movement, and the hub and disk brake of the axle assembly in a preloaded state by the driving unit. A run-out and starting torque measurement operation unit that measures run-out and starting torque while rotating;
An upper clamping unit and a lower clamping unit for fixing the shaft, and an axial play measuring operation unit for applying an external force biasing vertically downward to the knuckle of the axle assembly in a stationary state and measuring a displacement amount from the opposite side:
The preload forming operation unit, the runout and starting torque measurement operation unit, the shaft shake measurement operation unit, and the preload release operation unit are sequentially arranged at a predetermined distance apart.
Axle assembly inspection device. The axle assembly inspection apparatus according to claim 1, wherein the preload forming operation unit, the runout and starting torque measurement operation unit, the shaft shake measurement operation unit, and the preload release operation unit are sequentially arranged linearly or circularly on the turntable. . According to claim 1, The nut socket and the shaft socket are mounted respectively to the nut runner and the sliding unit of the preload forming operation unit and the preload release operation unit;
The preload forming operation part penetrates the hub shaft hole of the axle assembly by rising of the sliding unit while the shaft is coupled to the shaft socket and the nut is clamped to the nut socket, and by lowering and rotating the nut runner. Applying a predetermined pre-loading to the angular contact ball bearing of the axle assembly by tightening the nut to the threaded portion of the shaft;
The preload release operation unit releases the preload by disengaging the nut and the shaft coupled to the axle assembly from the screw portion of the shaft by lowering and reverse rotation of the nut runner.
Axle assembly inspection device. The axle assembly inspection apparatus according to claim 1, wherein a flange is formed at a lower portion of the shaft, and a lower portion of the flange is formed in a polygonal portion to enable firm fixation by a shaft socket. The method of claim 1, wherein the shaft is formed with a notch-shaped upper concave portion and a lower concave portion, and the upper clamping unit and the lower clamping unit of the shaft shake measurement operation unit are formed as wedge-shaped distal ends, and are formed to be interlocked and fixed. Axle assembly inspection device. The method according to claim 1, wherein the runout measurement of the runout and starting torque measurement operation unit is performed by a runout measurement sensor located in direct contact with at least a lower surface of the peripheral end of the rotating disk or spaced apart from a predetermined distance, and the starting torque measurement is driven. Axle assembly inspection device made by a starting torque measurement sensor installed in the unit. Intermittent inspection method of an axle assembly comprising the following steps:
(A) a provisional assembly step of penetrating a shaft having a threaded portion formed at an upper outer periphery from the lower side into the shaft hole of the hub of the introduced axle assembly and fastening a nut from the upper side;
(B) a preload forming step of fixing the shaft of the temporarily assembled axle assembly with a sliding unit and fastening the nut by downward rotation of the nut runner to apply and maintain a predetermined pre-loading to the angular contact ball bearing of the axle assembly;
(C) After clamping the arm of the knuckle of the axle assembly in the preloaded state with a hydraulic unit, lifting it and fixing it, runout while rotating the hub and the disc brake of the axle assembly in the preloaded state by a drive unit that is installed for lifting and rotating motion. Run-out and starting torque measurement step of measuring (run out) and starting torque;
(D) a shaft shake measurement step of automatically transferring the axle assembly in a preloaded state, fixing the upper and lower ends of the shaft, applying a biasing external force vertically downward to the knuckle of the axle assembly in a non-rotating stop state, and measuring a displacement amount from the opposite side;
(E) a preload release step of releasing the preload by releasing the nut fastened to the upper end of the shaft penetrating the hub shaft hole of the axle assembly on which the measurement has been completed; And
(F) Take-out step of separating and collecting the shaft and nut from the axle assembly from which the preload has been released, and discharging the axle assembly. The method of claim 7, wherein the steps (A) to (F) are performed intermittently and repeatedly at the same time. The intermittent inspection method according to claim 7, wherein the nut and shaft removed in the take-out step (F) are reused in the temporary assembly step (A).

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