JP2560194Y2 - Driving device for DUT - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for driving a device under test for connecting a device under test and a driving device.

[0002]

2. Description of the Related Art Generally, in a rotation test of a machine under test such as an engine, a hexagonal head of a tightening bolt such as a flywheel is used to connect the machine under test and a driving device. I have.

In FIG. 3, reference numeral 1 denotes an engine which is a machine under test, and an attachment 4 rotated by a driving device 3 constituting the testing machine is associated with a flywheel 2 connected to a crankshaft of the engine 1. So that they can be combined. That is, as shown in FIG. 4, the attachment 4 has a plurality of fitting bolts 5 fitted to the heads of the tightening bolts 5 at positions corresponding to the plurality of tightening bolts 5 connecting the flywheel 2 to the crankshaft. Are arranged in the circumferential direction, and the attachment 4 and the flywheel 2 are connected by fitting each of the chuck holes 6 into the hexagonal head 5a of the tightening bolt 5. It is.

[0004]

However, since a gap is always required between the hexagonal head 5a of the bolt 5 and the chuck hole 6, the bolt 5 always vibrates when the attachment 4 is suddenly rotated. And an impact load is applied. The force applied to the bolt is a tangential force at a contact point between the bolt 5 and the inner surface of the chuck hole 6, and the position at which the force is applied differs depending on the angular position of the bolt.

That is, in FIG. 5, when the hexagonal head 5a of the bolt 5 is at the solid line position with respect to the chuck hole 6, the force of F1 or F1 'acts on the bolt 5, and when the hexagonal head 5a is at the dotted line position. The force of F2 or F2 'acts. Therefore, if the bolts 5 are tightened in the direction of arrow R and the force of F2 or F2 'is applied to the bolt 5, torque in the loosening direction acts on the bolt 5, and the bolt 5 may be loosened. There is a problem that a limit check or the like must be performed each time after an engine rotation test or the like.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a joint for driving a test object using a tightening bolt in which the tightening bolt is not loosened as described above.

[0007]

According to the present invention, in order to achieve the above object, a chuck hole of an attachment is fitted to a plurality of tightening bolt heads projecting from a rotating shaft portion of a device to be tested, and the attachment is provided. The operation of the device under test by the rotation of the device under test, in the joint for driving the test object to perform the test, when the attachment is rotated, the engagement surface of the chuck hole that comes into contact with the bolt head fitted into the chuck hole of the attachment, The contact is formed only in a range in which the direction of the force acting on the bolt is equal to the direction of tightening the bolt, and in other areas, the chuck hole and the bolt are brought into a non-contact state.

[0008]

The tangential force acts on the bolt at the point of contact between the bolt and the inner surface of the chuck hole, but this contact occurs only in the area where the direction of the force acting on the bolt is equal to the bolt tightening direction. In addition, a force in only the tightening direction acts on the bolt, thereby preventing the bolt from being loosened.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a longitudinal sectional front view of the attachment 4 of the joint according to the present invention. The surface of the attachment 4 facing the driven wheel which is the driven portion of the attachment 4 is located at a position facing a plurality of tightening bolts. A plurality of chuck holes 10 slightly larger than the maximum diameter of the hexagonal head 5a of the bolt are provided in the circumferential direction.

A point at which the circle connecting the center of the square bolt 5 and the inner periphery of the chuck hole 10 intersects A and B (FIG. 2), and an intersection between the diameter of the attachment 4 and the inner periphery of the chuck hole 10. Is O, O ', the attachment 4
Outside the circle on the near side with respect to the rotation direction of A, ie, the range of AO, and inside the circle on the front side with respect to the rotation direction of the attachment 4, ie, B.
The contact surfaces 10a and 10b with the bolt are formed only in the range of -O ', and the notches 11a and 11
b is formed so that the hexagonal head 5 a does not contact the inner surface of the chuck hole 10.

However, when the attachment 4 rotates in the direction of the arrow in FIG. 2 and the bolt head 5a vibrates, the bolt head 5a always contacts only the contact surfaces 10a and 10b in the chuck hole 10 of the attachment 4, and The impact load is only the arrows F1 and F1 'in FIG. 2, and the force applied to the tightening bolt always acts in the tightening direction as shown in FIG. 2 regardless of the rotational direction of the bolt head 5a. No loosening torque is generated for the bolt, and the bolt does not loosen due to the impact.

The chuck hole 1 shown in FIGS.
The shapes of the notch 11 and the notches 11a and 11b are designed so that they can be machined only with a drill and an end mill. Shape.

[0014]

As described above, in the present invention, when the attachment is rotated, the engagement surface of the chuck hole which comes into contact with the head of the bolt fitted into the chuck hole of the attachment is attached to the bolt by the contact. Since the direction of the acting force was formed only in the range where the bolt tightening direction was equal,
Even if an impact force is applied to the bolt due to the vibration of the bolt, the direction of the impact force is always only the bolt tightening direction, so that the bolt does not loosen, and it is necessary to perform limit checks etc. each time after the test There are no effects.

[Brief description of the drawings]

FIG. 1 is a vertical front view of the attachment of the present invention.

FIG. 2 is an operation explanatory view of the present invention.

FIG. 3 is a diagram showing a state in which the engine and the test device are connected by a joint.

FIG. 4 is a front view of a conventional joint.

FIG. 5 is an operation explanatory view of a conventional joint.

[Explanation of symbols]

 2 Flywheel 3 Drive 4 Attachment 5 Bolt 5a Hex head 10 Chuck hole 10a Contact surface 11a, 11b Notch

Claims (1)

(57) [Scope of request for utility model registration] 1. A device under test for operating and testing a device under test by fitting a chuck hole of an attachment to a plurality of tightening bolt heads protruding from a rotating shaft portion of the device under test, and rotating the attachment. In the drive joint, when the attachment is rotated, the engagement surface of the chuck hole that comes into contact with the head of the bolt fitted into the chuck hole of the attachment has a direction in which the force acting on the bolt due to the contact is in the bolt tightening direction. Characterized in that the chuck hole and the bolt are in a non-contact state in the other range only, and the chuck hole and the bolt are in a non-contact state in the other range.