JPS5852062Y2 - Angle method tightening jig - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a tightening jig used, for example, when tightening a connecting rod nut or cylinder head bolt of an internal combustion engine using the angle method.

For example, when tightening a connecting rod nut using the angle method,
Conventionally, there was no suitable jig, so the tightening workability was poor.
In addition, it was extremely difficult to work alone, so an assistant was required.

In view of these circumstances, this invention provides a tightening jig that can accurately and efficiently perform tightening work using the angle method without requiring an assistant.

This invention will be explained in detail below based on illustrated embodiments.

In the figure, reference numeral 1 denotes a connecting rod nut for tightening and fixing a cap 3 to a connecting rod body 2, and these nuts are adjacent to each other at a required interval.

As mentioned above, the socket 4 that engages with one of the adjacent connecting rod nuts 1 has a rotary disk 5 attached to the nut 6.
Tighten and secure.

Furthermore, by interposing an 0-IJ ring 7 or the like at the abutting portion between the socket 4 and the rotary disk 5, it is possible for them to slide and rotate relative to each other when a torque of a predetermined value or more is applied between them. .

Further, a joint arm 9 whose base portion is rotatably inserted in the vicinity of the lower end of the socket 4 and secured to the clip 8 so as not to come off has a joint socket 10 which is positioned and fitted with the other connecting rod nut 1 at the tip end of the joint arm 9. I'm fixated on it.

The fitting hole of this joint socket 10 is formed into a cylindrical shape that is externally fitted into the connecting rod nut 1.

A steel ball 13, which is positioned and fitted into a recess 12 carved on the top surface of the rotary disk 5, is attached to the arm portion 11, which is abraded from the upper end of the joint socket 10 toward the surface of the rotary disk 5, so as to be able to rise and fall freely. are doing.

A coil spring 16 is interposed between the upper surface of the steel ball 13 and the lower surface of a set screw 15 screwed into a nut 14 welded to the arm portion 11, so that the spring 16 moves the steel ball 13 onto a rotary disk. 5
It is forced to rush into the recess 12 of.

Reference numeral 17 denotes a lock nut of the set screw 15, and the recess 12, steel ball 13, etc. constitute a zero point setting device 18 that locks the rotary disk 5 and the joint arm 9 at a predetermined position.

Further, the arm portion 11 is provided with a pointer 19.

On the other hand, a normally open contact 20 is attached to the upper surface of the rotary disk 5 at a position separated by a predetermined angle θ with the tip of the pointer 19 as the zero point. 21 and an indicator lamp 22 are connected.

In the above configuration, when the turntable 5 and the socket 4 are rotated by an angle θ from the zero point setting position with respect to the joint arm 9, the tip of the pointer 19 attached to the arm portion 11 of the joint arm 9 rotates by θ. It moves along the top surface of the board 5 and comes into contact with the movable piece of the contact 20, which closes the contact 20 and lights up the indicator lamp 22.

Therefore, to tighten the connecting rod nut using the angle method,
First, the socket 4 is engaged with the target connecting rod nut 1, and the joint socket 10 is positioned and fitted to the other connecting rod nut 1, so that the joint arm 9 is positioned and held relative to the connecting rod nut.

Next, rotate the turntable 5 by hand or the like to attach the joint arm 9.
and the rotary disk 5 are set at predetermined positions by the zero point setting device 18.

Then, a tightening bundle (not shown) is engaged with the upper end of the socket 4 and rotated in a predetermined direction, thereby tightening and rotating the target connecting rod nut 1 via the socket 4.

Then, as the socket 4 rotates, the rotary disk 5 rotates, and the contact 20 gradually approaches the pointer 19, and when the socket 4, that is, the target connecting rod nut 1, is tightened by the required angle, the contact 20 is attached to the pointer 19. comes into contact with each other and the indicator lamp 22 lights up.

Therefore, after tightening the connecting rod nut 1 to a required torque using a torque wrench or the like, the nut may be further tightened using a jig such as the one described above until the indicator lamp 22 lights up.

Note that the locking force by the zero point setting device 18 is
Of course, it is necessary to make the bonding force weaker than that between the rotary disk 5 and the rotary disk 5.

Further, the socket 4 and the rotary disk 5 only need to be able to rotate at least within the required range, and by attaching an appropriate angle scale to the top surface of the rotary disk 5, it can be used as a guide for tightening operations. .

In the embodiment, the distance between the socket 4 and the joint socket 10 is fixed, and the pointer 19 and the contact 20 are fixed.
are attached at fixed positions, but by changing their relative positions or changing the position of the zero point set, the tightening jig can be made more versatile.

As explained above, according to the tightening jig of this invention, the target fastener (bolt or nut) can be tightened by rotating the socket while monitoring the operating status of the indicator, such as a lamp. Since it can be tightened only at a predetermined angle, there is no need for an assistant like in the past.

Further, since the end point of tightening the socket can be known through the operation of the indicator, it is easy to confirm by reading the conventional scale, and the accuracy of the tightening work can be improved.

Therefore, even if fasteners such as connecting rod nuts or cylinder head bolts require high-torque and highly accurate tightening work, they can be tightened with high efficiency without the need for special assistants. Moreover, it can be tightened accurately and reliably.

[Brief explanation of the drawing]

The drawings show an embodiment of the jig with angle normal according to this invention, in which Fig. 1 is a side view of the attached state, Fig. 2 is a perspective view of the jig, and Fig. 3 is an exploded perspective view. , FIG. 4 is an exploded perspective view of the zero point setting device section. 1...Connecting rod nut, 4...Socket, 5...Rotary disk, 9...Joint arm, 10...Joint socket , 18
...Zero point setting device, 19 ... Pointer, 20 ... Contact, 21 ... Battery, 22 ... Display lamp.

Claims (1)

[Scope of utility model registration request] A joint arm that rotates around a socket that engages with one of the adjacent fasteners is provided with a joint socket and a pointer that are positioned and fitted to the other fastener at the tip of the joint arm, and a rotary disk and a joint that are attached to the socket are provided. A zero point setting device is provided between the end of the arm and the end of the arm to rotate and lock the two at a predetermined position, and when the rotary disk rotates by a predetermined angle with respect to the joint arm from the zero point as a starting point, A jig with an angle normal line, characterized in that a contact which is closed when it comes into contact with the pointer, and an indicator connected to a power source through the contact are mounted on a rotary disk.