JPH0658277B2 - Grasping device of balance tester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a gripping device for a work to be tested in a balance testing machine.

<Prior Art> The conventional gripping device is fitted to the inner diameter of the work, and the pin or
It was a structure that gives torque by the key.

Therefore, there is a drawback that the work is eccentrically supported due to a slight gap existing on the fitting surface, resulting in a measurement error. In addition, there is a problem that the work of setting a fixing tool such as a pin must be manually performed.

Therefore, the applicant has already had a first tapered surface at the tip of the head, and a push rod that is axially reciprocally driven with respect to the apparatus main body and a slidable fit on the outer periphery of the body of the push rod. And a push sleeve having a second tapered surface at the tip end thereof is engaged in the axial direction via a spring, and a plurality of flexible gripping members radially extending around the push rod are provided in the device body. Similarly, a plurality of rigid gripping members that extend radially are supported, and each flexible gripping member has an inclined surface that abuts the first tapered surface of the push rod tip, and each rigid gripping member has a second tip of the push sleeve. Has proposed a gripping device having a structure in which each of the inclined surfaces is formed in contact with the taper surface of (No. 59-5).
2440). According to the proposed device, the radial flexible gripping member elastically holds the inner surface of the workpiece by the drive of the push rod and positions it in the centering state, and at the same time as this, the positioning state is set via the push sleeve. Since the inner surface of the work is pressed by each rigid gripping member, the work can be surely centered and the torque can be applied without using a fixing tool such as a pin.

<Problems to be Solved by the Invention> By the way, according to the above proposal, although the centering of the work in the radial direction is possible, at the time of holding the work by the flexible gripping member especially in the work having a large diameter. When the center axis of the work is tilted with respect to the rotation center axis of the gripping device, it is impossible to chuck the work in the intended posture (the work center axis and the rotation axis of the gripping device match) was there.

An object of the present invention is to provide a gripping device of a balance tester that can chuck a work automatically and surely in a posture in which its central axis and the rotation axis of the device match.

<Means for Solving the Problems> In order to achieve the above object, the gripping device of the balance testing machine of the present invention has a first tip as shown in FIG. 1 and FIG. A push rod 1 having a head 2 having a tapered surface 7 and a cylindrical body 3 behind the head 2 and axially reciprocally driven in an apparatus body 12, and provided at the base of the body 3 of the push rod 1. The stepped portion 5 and the ring 8 pressed forward by the stepped portion 5 are engaged with each other via a spring, and are fitted to the body portion 3 to be displaced in the axial direction, and the first portion is attached to the tip. And a push sleeve 9 having a second tapered surface 11 having a diameter larger than that of the tapered surface 7 and an outer side of the elastically deformable portion 16 which is long in the radial direction are fixedly supported by the device main body 12, and an inner rear end of the elastically deformable portion 12 is Has a first inclined surface 18 that abuts the first tapered surface 7, and Its slope 18
A plurality of flexible gripping members 14 that are arranged radially around the push rod 1 and that are formed with a first mating surface 20 that projects further forward than the inner diameter of the work to be balanced tested. ... 14 and a substantially rigid body, which is provided at a location where it does not interfere with the elastically deformable portion 16 and which is long in the radial direction, is rotatably supported by the apparatus body 12 on the outside.
The inner rear end of the root portion 21 has a second inclined surface 23 that comes into contact with the second tapered surface 11, and the inclined surface 23
A plurality of second mating surfaces 25 projecting forward and contacting the inner diameter of the work are formed. The rigid gripping members 15 ... 15 are provided, and the apparatus main body 12 is located outside the flexible gripping members 14 ... 14 and the rigid gripping members 15. It is characterized by providing a plurality of reference surface support members 13 that abut the reference surface.

<Embodiment> FIG. 1 shows a front view of an embodiment of the present invention, and FIG. 2 shows a longitudinal sectional view thereof.

As shown in FIG. 2, the work W to be tested includes a work reference plane A located on the end face in the vicinity of the outer peripheral portion thereof, a first cylinder inner surface B having a small inner diameter and strict dimensional tolerance, and a cylinder inner surface B thereof.
Has a second cylindrical inner surface C having a larger inner diameter and a relatively gentle dimensional tolerance.

A push rod 1 is provided on the central axis of the gripping device. The push rod 1 includes a head 2, a body 3, and a shaft 4 connected to a power source (not shown) such as a hydraulic cylinder. Further, the base of the body 3 is axially adjustable by a screw. The nut 5 is provided, and the side surface 6 of the nut 5 constitutes a step portion. The head 2 has a first tapered surface 7 at the tip, and the body 3 is a cylindrical shaft having a diameter smaller than that of the head 2. A guide ring 8 is fitted to the rear portion (a portion near the root) of the body portion 3, a push sleeve 9 is slidably fitted to the front portion of the body portion 3, and a disc spring laminate 10 is interposed therebetween. is doing. Push sleeve 9
A second tapered surface 11 is formed at the tip of the.

On the front surface of the gripping device body 12, there are provided, for example, three contact points on the outer peripheral portion, each of which is in contact with the work reference surface A and regulates its position, and three contact plates 13 are provided in the central portion at 120 ° intervals. 14, and the three rigid gripping members 15 ... 15 are radially arranged in an intermediate position.

Here, this embodiment shows an example in which the outer diameter of the work W is relatively large. Therefore, the reference surface abutting plate 13 that abuts the work reference surface A of the end face in the vicinity of the outer periphery of the work W is as shown in FIGS.
As shown in (3), it is fixed to the tip portions of the three arms that are brought out from the gripping device main body 12 to the outside.

The flexible gripping member 14 has a body 1 that is attached to the outside of an elastically deformable portion 16 that is long in the radial direction and thin in the axial direction by a bolt 17.
The first inclined surface 18 having the same slope is formed at the inner rear end of the elastically deformable portion 16 of the head 2 and is in contact with the first taper surface 7 of the head 2 to thereby project forward. The front end portion 19 is bent outward in the radial direction to form a first mating surface 20. The mating surface 20 is finished with high precision and smoothness.

In the rigid gripping member 15, a root portion 21 which is long in the radial direction is embedded in a groove of the main body 12, the outside of the root portion 21 is rotatably supported by a return spring 22, and the inside of the root portion 21 A second inclined surface 23 having the same slope is formed at the end so as to come into contact with the second tapered surface 11 of the push sleeve 9, and the front end portion of the projection 24 projecting forward from the second inclined surface 23 is keyed outward in the radial direction. The second mating surface 24 is formed by being bent in a vertical direction. The mating surface 24 may be a rough surface or may have irregularities such as splines.

Next, the operation will be described.

When the push rod 1 is retracted, the step portion 6, the guide ring 8, the push sleeve 9, and the disc spring 10 are all retracted, and the three flexible gripping members 14 ... 14 are in the restored state. The outer diameter formed by the contact surfaces 20 ... 20 is slightly smaller than the first cylindrical inner surface B of the workpiece. Further, the three rigid gripping members 15, ...
The front end is rotationally displaced in the direction of arrow D by the force of 22.

When the work W is mounted and the push rod 1 advances, the first tapered surface 7 of the head 2 presses the first inclined surfaces 18 of the three flexible gripping members 14 ...
6 is deformed to hold the first cylindrical inner surface B of the work W at a predetermined position. Almost at the same time, the second tapered surface 11 of the push sleeve 9 presses the second inclined surface 23 of the three rigid gripping members 15 ... 15 and the second mating surface 24 presses the second cylindrical inner surface C. At this time, the rigid gripping members 15 ... 1
5 is a work W because a force is applied via the disc spring 10.
Regarding the holding position of, the position regulation by the elastic gripping members 14 ... 14 has priority. When pressing the cylindrical inner surface B of the work W with the flexible gripping members 14 ... 14, the work W has three work reference surfaces A, which are end surfaces near the outer peripheral portion of the work W. The flexible gripping members 14, ...
In the state where the position is defined through the inner diameter surface B, that is, the centering is performed, the work W is always centered in a constant posture.

On the other hand, since the second mating surface 24 of the rigid gripping member 15 has a larger coefficient of friction than the first mating surface, torque is mainly transmitted by the rigid gripping members 15 ...

FIG. 3 shows a sectional view of another embodiment of the present invention. The same parts as those in the above embodiment are designated by the same reference numerals to represent the structure, and the description thereof will be omitted. It should be noted that the reference surface contact plate 13 is used in place of the reference surface contact plate 13 and that the protrusion 24 'of the rigid gripping member 15 rises from a position slightly offset from the second inclined surface 23 to the outside. This is different from the above-described embodiment.

<Effect of the Invention> According to the present invention, the work W is automatically chucked by the reciprocating drive of the push rod 1, and the automation of the measurement is facilitated. And in this chucking operation,
The first mating surface of the radial flexible gripping member defines the holding position of the work to center it, and at the time of centering, the reference surface of the end face near the outer peripheral portion of the work has a plurality of reference surfaces. Since the position is regulated by the member, the work is always centered in a fixed posture, and in such a state, the torque is transmitted to the work by the second mating surface of the rigid gripping member and the key, pin Since no torque transmitting means such as the above is required, the work can be automatically chucked, and the work is rotated without being eccentric or tilted. As a result, the reliability of the test result is improved. Furthermore, since the rigid gripping member 21 is rotatably supported, the outer diameter defined by the three points of the second contact surface 24 can be reduced with the push rod retracted, and FIG. It can also be applied to the case where the second cylinder inner surface C as illustrated in FIG.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is a sectional view thereof. FIG. 3 is a sectional view of another embodiment of the present invention. 1 ... Push rod, 2 ... Head 3 ... Body, 6 ... Step 7 ... First taper surface, 8 ... Guide ring 9 ... Push sleeve, 10 ... Disc spring 11 ... First Second taper surface, 12 ... Main body 13 ... Reference surface contact plate 14 ... Flexible gripping member 15 ... Rigid gripping member, 16 ... Elastic deformation part 18 ... First inclined surface, 19 ... Protrusion Part 20 ... First mating surface, 21 ... Core part 22 ... Return spring, 23 ... Second inclined surface 24 ... Projection part, 25 ... Second mating surface

Claims (1)

[Claims] 1. A push rod having a head having a first tapered surface at its tip and a cylindrical body behind the head, which is axially reciprocally driven in the main body of the apparatus, and the body of the push rod. A stepped portion provided at the root portion and a ring pressed forward by the stepped portion are engaged with each other via a spring, and are fitted to the body portion to be displaced in the axial direction, and the tip end is provided with the above-mentioned A push sleeve having a second taper surface having a diameter larger than that of the first taper surface, and an outer side of the elastically deformable portion that is long in the radial direction is fixedly supported by the apparatus main body, and the first rear end is provided at the inner rear end of the elastically deformable portion. Push rod having a first inclined surface which comes into contact with the tapered surface of the work piece, and which projects forward from the inclined surface and comes into contact with the inner diameter of the work to be balanced-tested. Multiple flexibly arranged radially around the And hair member consists of substantially rigid,
The outer side of the root portion, which is long in the radial direction and is provided at a location where it does not interfere with the elastically deformable portion, is rotatably supported by the apparatus body,
A second mating surface having a second inclined surface that abuts the second tapered surface at the inner rear end of the root portion and that projects forward from the inclined surface and abuts the inner diameter of the work is formed. A plurality of rigid gripping members arranged radially around the push rod at a position that does not interfere with the flexible gripping member, and the apparatus body,
A balance tester provided with a plurality of reference surface abutting members that come into contact with a reference surface in the vicinity of the outer peripheral portion of the work end surface, outside the flexible gripping members and the rigid gripping members around the push rod. Gripping device.