JP2010122153A - Device for rocking/rotation testing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for rocking/rotation testing for carrying out both an endurance test and a performance test on machine parts, etc. <P>SOLUTION: The device 1 for rocking/rotation testing by rocking and rotating a test body 2 includes a tool 50 with the test body 2 coupled thereto, a drive (a swing arm 10 and a spindle 30) for rocking and rotating the tool 50, resistance force measurement means (sensors 51 and 52) provided between the drive (spindle 30) and the tool 50 to measure the resistance force of the test body 2, and a relative displacement allowing gap 20 allowing relative displacement between the tool 50 and the drive (the spindle 30) to such an extent that bending moment equal to or more than an allowable value does not act on the measurement means (the sensors 51 and 52). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rocking and rotating test apparatus for rocking and rotating a test body.

  2. Description of the Related Art Conventionally, in order to test the durability of a machine part, a test apparatus that repeatedly moves a test piece of the machine part is used.

The rolling slip test apparatus disclosed in Patent Document 1 repeatedly performs a swinging motion of a test body and evaluates its durability and lubrication performance.
JP 2003-247915 A

  When performing both endurance tests and performance tests on machine parts, etc. using a single test device, if a sensor that measures the resistance of the test body is provided in the drive unit that moves the test body, this sensor will be excessive during the endurance test Load may damage the sensor. For this reason, after performing an endurance test with the sensor attached to the drive unit, it was not possible to perform a performance test for measuring friction or the like of the specimen using this sensor.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a rocking and rotating test apparatus capable of performing both a durability test and a performance test on mechanical parts and the like.

  The present invention relates to a swing rotation test apparatus that swings and rotates a test body, a jig to which the test body is connected, a drive unit that swings and rotates the jig, and the drive unit. A resistance measuring means that is provided between the jig and that measures the resistance force of the specimen, and a relative that allows relative displacement between the jig and the drive unit within a range in which a bending moment exceeding the allowable value does not act on the resistance measuring means. It was characterized by having a displacement allowable gap.

  According to the present invention, the oscillating rotation test apparatus is configured to drive a jig and a drive when a lateral force less than an allowable value is applied by moving the drive unit, for example, during a performance test for evaluating the friction performance of the test specimen. It is possible to evaluate the friction performance and the like of the test specimen based on the output signal of the resistance force measuring means. it can.

  During the durability test to evaluate the durability etc. of the test body, the restricting part of the drive part and the jig abut against each other, avoiding any more bending moment being applied to the resistance measuring means, and the resistance measuring means Is protected. Thereby, it is not necessary to provide a lock mechanism or the like for restricting the relative displacement between the drive unit and the jig, and the structure can be simplified.

  In this way, it is possible to perform a durability test and a performance test with a single oscillating rotation test apparatus, and these tests can be continuously performed while maintaining a constant temperature condition or the like.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  First, FIG. 1 shows an example of a swing rotation test apparatus to which the present invention can be applied. The swing rotation test apparatus 1 shown in FIG. 1 performs a durability test in which the swing and rotation of the test body 2 are repeatedly operated, and performs a performance test to measure the friction of the test body 2 before and after the durability test. Is.

  FIG. 1 is a cross-sectional view showing a sensor mounting portion of the swing rotation test apparatus 1. Here, three axes X, Y, and Z orthogonal to each other are set, the X axis extends in a substantially horizontal lateral direction, the Y axis extends in a substantially horizontal front-rear direction, and the Z axis extends in a substantially vertical direction. The configuration of the swing rotation test apparatus 1 will be described.

  The swing / rotation test apparatus 1 swings about a swing center axis (Y axis) extending in the Y-axis direction with respect to a gantry (not shown), and rotates with respect to the swing arm 10 via a bearing 29. A spindle 30 for connecting the test body 2 to the spindle 30, and a fixing jig 49 for connecting the test body 2 to the gantry. While swinging around a center axis (not shown), the test body 2 is rotated around the rotation center axis O of the spindle 30.

  For example, the test body 2 that is a ball joint includes a ball 4 and a cage 5 that are rotatably fitted to each other, and functions as a universal joint that rotatably connects two members.

  The test body 2 has its balls 4 fastened to a jig 50 and its cage 5 fastened to a fixing jig 49.

  In addition, the test body 2 is not limited to a ball joint, and may be another mechanical component having a configuration in which two members are rotatably fitted.

  The swing rotation test apparatus 1 measures the friction of the test body 2 based on the measured values of the sensors 51 and 52 in a state where a load is applied to the test body 2 during the performance test.

  A component force sensor 51 and a torque sensor 52 are provided between the spindle 30 and the jig 50 as resistance force measuring means for measuring the resistance force of the test body 2.

  The component force sensor 51 measures the component forces in the X and Y biaxial directions generated by the friction of the test body 2 when the swing arm 10 is swung.

  The torque sensor 52 measures the resistance around the Z axis generated by the friction of the test body 2 when the test body 2 is rotated by the spindle 30 as torque.

  A preload bolt (sensor fixing bolt) 54 for connecting the jig 50 to the spindle 30 is provided. The end of the preload bolt 54 is screwed to the spindle 30 and fastened, and is mounted on the rotation center axis O of the spindle 30.

  A cylindrical centering sleeve 48 through which the preload bolt 54 passes is provided. The annular sensors 51 and 52 are supported by being fitted to the outer peripheral surface of the centering sleeve 48.

  A preload nut 79 is screwed into an end portion of the preload bolt 54, and the sensors 51 and 52 and the sensor attachment 60 are fastened side by side between the spindle 30 and the preload nut 79. The sensors 51 and 52 are given a predetermined tightening load by a preload bolt 54.

  The sensor attachment 60 constituting the jig 50 is formed in a bottomed cylindrical shape, and includes a disk-shaped sensor attachment bottom portion 61 and a cylindrical sensor attachment cylindrical portion 62.

  An annular spacer 57 is fastened to the annular end of the sensor attachment cylindrical part 62 via a plurality of bolts 69, and the jig 50 is fastened to the spacer 57.

  The sensor attachment bottom 61 is interposed between the preload nut 79 and the torque sensor 52. Thereby, the sensor attachment 60 transmits the load received by the jig 50 from the test body 2 to the torque sensor 52 and the component force sensor 51.

  In the endurance test, the swing / rotation test apparatus 1 moves the test body 2 around the swing center axis of the swing arm 10 in a state where loads in the Z-axis direction and the X-axis direction are applied to the test body 2 by a servo actuator (not shown). The operation of rotating the test body 2 around the rotation center axis O of the spindle 30 is repeatedly performed.

  In order to protect the sensors 51 and 52 during the durability test, a relative displacement allowable gap 20 is defined between the drive unit (spindle 30) and the jig 50. The relative displacement permissible gap 20 allows relative displacement between the jig 50 and the drive unit (spindle 30) within a range in which an excessive bending moment exceeding a predetermined allowable value does not act on the sensors 51 and 52.

  The spindle 30 has a cylindrical jig surrounding wall 31, and the sensors 51 and 52 and the sensor attachment 60 are surrounded by the jig surrounding wall 31. The sensor attachment 60 is surrounded by the jig surrounding wall 31 as a part of the jig 50.

  As shown also in FIG. 2, the relative displacement allowable gap 20 is formed between the outer peripheral surface 63 of the sensor attachment cylindrical portion 62 and the annular restricting portion 22 provided on the inner peripheral surface 33 of the jig surrounding wall 31. 30 rotation center axes O are defined as radial gaps.

  The outer peripheral surface 63 of the sensor attachment cylindrical portion 62 and the inner peripheral surface 33 of the spindle 30 are concentric with respect to the rotation center axis O of the spindle 30 in a free state where no load is applied to the jig 50 and the drive unit (spindle 30). The relative displacement allowable gap 20 is defined as an annular space having a uniform width in the circumferential direction. As a result, relative displacement between the jig 50 and the drive unit (spindle 30) is allowed within a range in which an excessive bending moment exceeding a predetermined allowable value does not act on the sensors 51 and 52.

  When a load is applied to the jig 50 and the drive unit (spindle 30) and a bending moment is applied to the sensors 51 and 52, the sensor attachment 60 is decentered with respect to the rotation center axis O of the spindle 30, and the sensor attachment cylinder 62 is the spindle. When abutting on the inner peripheral surface 33 of the sensor 30, the displacement of the sensor attachment 60 is restricted, and it is possible to avoid that a bending moment beyond that is applied to the sensors 51 and 52.

  More specifically, the preload bolt 54 is extended by a horizontal excitation force, and the center line P of the preload bolt 54, the sensors 51 and 52, and the sensor attachment 60 in FIG. 3 extends linearly as shown by a solid line when there is no load. When the horizontal excitation force F is applied, it is deformed as indicated by a two-dot chain line. Actually, the center line P is deformed with a curvature, but the curvature is neglected here because of the slight displacement.

  The jig surrounding wall 31 is a hatched portion in FIG. 2 and has sufficient rigidity with respect to the horizontal excitation force F. After the sensor attachment 60 comes into contact with the regulating portion 22 of the jig surrounding wall 31, Even if the horizontal excitation force F is increased, F ′ is assumed not to increase more than the force applied to the preload bolt 54 until bending contact with the restricting portion 22.

  The bending moment M acting on the sensors 51 and 52 is M = F ′ × i, and a value W (= M / R) obtained by dividing M by the sensor radius R acts as a force for bending the sensors 51 and 52.

  The clearance b of the relative displacement allowable gap 20 defined between the inner diameter D1 of the inner peripheral surface 33 of the jig surrounding wall 31 and the outer diameter D2 of the sensor attachment cylindrical portion 62 is obtained by the following procedure.

First, the bending force F ′ acting on the preload bolt 54 is obtained from the allowable bending moment M of the sensors 51 and 52 by the following equation.
F ′ = M / i (1)

The amount of deflection δ of the preload bolt 54 due to the bending force F ′ is obtained as the deflection of the cantilever by the following equation However, E is a longitudinal elastic modulus of the preload bolt 54, and I is a cross-sectional secondary moment of the preload bolt 54.
^{δ = F '× i 3/} 3 × E × I = (M / i) × i 3/3 × E × I = M × i 2/3 × E × I
... (2)

The relationship between the deflection amount δ of the preload bolt 54 and the gap b of the relative displacement allowable gap 20 is
i: δ = h: b, and the amount of deflection δ is obtained by the following equation.
δ = (i / h) × b (3)

The clearance b of the relative displacement allowable gap 20 is obtained from the allowable bending moment M of the sensors 51 and 52 by the following equation.
Substituting δ in equation (3) into equation (2),
(I / h) × b = M × i 2/3 × E × I
Therefore,
b = M × h × i / 3 × E × I (4)
Therefore, if the clearance b of the relative displacement allowable gap 20 is set so as to satisfy the relationship of b ≦ M × h × i / 3 × E × I, the bending moment applied to the sensors 51 and 52 can be kept within the allowable value. Can do.

For example, if the allowable bending moment M is 200 N · m, h is 8 cm, i is 6 cm, F ′ is 340 kgf, E is 2100000 kgf / cm ² , and I is 025 cm ⁴ , the clearance b of the relative displacement allowable gap 20 is 0. About 6mm.

  As a result, when a large bending moment is applied to the preload bolt 54 during the durability test, the restricting portion 22 of the driving portion (spindle 30) and the jig 50 come into contact with each other, and the bending moment beyond that is detected by the sensors 51 and 52. Can be avoided. Thus, the sensors 51 and 52 are protected.

  On the other hand, when a lateral force less than the allowable value is applied during a performance test for evaluating the friction performance or the like of the test body 2, the drive unit (spindle 30) is moved within the range of the clearance b of the relative displacement allowable gap 20 and driven. The control part 22 of the part (spindle 30) and the jig 50 do not contact each other, and a bending moment corresponding to this lateral force is loaded on the component force sensor 51, and the test body is based on the output signal of the component force sensor 51. 2 friction performance and the like can be evaluated.

  In the present embodiment, the swing rotation test apparatus 1 swings and rotates the test body 2, and includes a jig 50 to which the test body 2 is coupled, and a drive that swings and rotates the jig 50. Part (swing arm 10, spindle 30), resistance force measuring means (sensors 51, 52) provided between the driving part (spindle 30) and the jig 50 and measuring the resistance force of the test body 2, and resistance A relative displacement allowable gap 20 that allows relative displacement between the jig 50 and the drive unit (spindle 30) in a range in which a bending moment greater than the allowable value does not act on the force measuring means (sensors 51 and 52) is provided.

  Based on the above-described configuration, the swing rotation test apparatus 1 is configured so that the restriction portion 22 of the drive portion (spindle 30) and the jig 50 are in contact with each other during the durability test for evaluating the durability of the test body 2 and the like. The bending moment is not applied to the sensors 51 and 52, and the sensors 51 and 52 are protected.

  Thereby, it is not necessary to provide a lock mechanism or the like for restricting the relative displacement between the drive unit (spindle 30) and the jig 50, and the structure can be simplified.

  In this way, it is possible to perform a durability test and a performance test with a single oscillating rotation test apparatus, and these tests can be continuously performed while maintaining a constant temperature condition or the like.

  In the present embodiment, the drive unit includes a swing arm 10 that swings around the swing center axis, and a drive unit (spindle 30) that rotates relative to the swing arm 10.

  Thereby, the swing rotation test apparatus 1 can simultaneously perform an operation of swinging the test body 2 and an operation of rotating the test body 2.

  In the present embodiment, a jig surrounding wall 31 that surrounds the jig 50 is provided in the drive unit (spindle 30), and the relative displacement allowable gap 20 is a gap in the radial direction with respect to the rotation center axis O of the drive unit (spindle 30). The composition is defined.

  Based on the above configuration, the jig surrounding wall 31 is given sufficient rigidity, and an excessive bending moment can be avoided from being applied to the sensors 51 and 52.

  The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

Sectional drawing of the rocking | swiveling rotation test apparatus which shows embodiment of this invention. Sectional drawing of jigs etc. similarly. The figure which shows a mode that a bending moment similarly acts on a preload bolt.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oscillation rotation test apparatus 2 Test body 10 Swing arm (drive part)
20 Relative displacement permissible gap 22 Restriction part 30 Spindle (drive part)
31 Jig enclosure wall 33 Inner peripheral surface 49 Fixing jig 50 Jig 51 Component force sensor (resistance measuring means)
52 Torque sensor (resistance force measuring means)
54 Preload bolt 60 Sensor attachment

Claims (2)

An oscillating rotation test device that oscillates and rotates the test body,
A jig to which the specimen is connected;
A drive unit for swinging and rotating the jig;
Resistance force measuring means for measuring the resistance force of the specimen provided between the drive unit and the jig;
A swing / rotation testing apparatus comprising a relative displacement permissible gap that allows relative displacement between the jig and the drive unit within a range in which a bending moment greater than a permissible value does not act on the resistance force measuring means. A jig surrounding wall for surrounding the jig is provided in the driving unit,
2. The swing rotation test apparatus according to claim 1, wherein the relative displacement permissible gap is defined as a radial gap with respect to the rotation center axis of the drive unit.

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