JPS6237008Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a chain fastener used for fastening a timing chain tensioned by a chain tensioner in an automobile engine.

As shown in FIG. 1, in an automobile engine, a timing chain attached to a cam sprocket and a crank sprocket is removed from the sprocket when a valve mechanism is disassembled, and then reattached during assembly.

If you remove the timing chain from the cam sprocket toy like this, the timing chain will fall,
The hit roller-ho of Chien Tenshi Yonani pops out.

Therefore, in order to hang the timing chain on the sprocket again, the work must be done while moving the contact roller of the chain tensioner backward, which is extremely troublesome.

In view of the above-mentioned circumstances, the present invention has been developed by pressing and holding one side of the timing chain against the chain guide when removing the timing chain from the sprocket.
This provides a chain fastener used to fasten a timing chain by pressing and holding the other side against the stopper roller of a chain tensioner, and has a vertical screw hole in the center of an upper connecting part to which the upper end of a pantograph-shaped member is pivoted. is installed through the vertical threaded hole, and the lower end of a rotating rod with a male threaded portion screwed into the vertical threaded hole is rotatably attached to the lower connecting portion of the pantograph-shaped member, and further, This is a chain fastener in which the left chain presser and the right chain presser are pivoted at the intermediate portions in the length direction, respectively, to the fitting parts.

An embodiment of the chain fastener of the present invention will be described with reference to the drawings. As shown in FIGS. It is pivotally attached to the protruding shaft parts 5a, 5a at both ends of the connecting part 5, and is attached via a retaining ring 6. , 9a, and is attached via a retaining ring 10.

The upper connecting portion 5 has a vertical screw hole 11 in the center thereof, and a male screw portion 12a is inserted into the vertical screw hole 11.
Small diameter portion 12b at the lower end of the rotating rod 12 screwed together.
is inserted into the insertion hole 13 provided through the center of the lower connecting portion 9, and the small diameter portion 1 protrudes from the lower surface of the lower connecting portion 9.
A washer 14 is fitted into a threaded portion 12c carved at the end of 2b, and a bag nut 15 is screwed on.The lower end of the turning rod 12 is rotatably attached to a lower connecting portion 9. It is designed to move downward with very little operating margin in the direction.

Next, the longitudinal intermediate portions of the both side plate portions 17a of the left chain presser 17 are pivotally attached to the protrusions 16a, 16a at both ends of the left intermediate connecting portion 16 of the pantograph-shaped member 2, and both ends of the right intermediate connecting portion 18 are attached. protrusion 18
a, 18a to both side plate parts 1 of the right chain pressing 19
The left intermediate pivot portion 2 is pivoted at the longitudinal intermediate portion of 9a.
The longitudinal intermediate portions of a left chain presser 17 and a right chain presser 19 are pivotally connected to the 0 and right intermediate pivot portions 21, respectively.

The male threaded part 12a carved on the turning rod 21 is a left-handed thread, and the left chain pusher 17 and the right chain pusher 19 are formed by bending an aluminum plate, and the respective side plate parts 17a,
The inside of the lower part of 17a is beveled in a downwardly expanding shape,
The upper end of the rotating rod 12 is a square head 12d, and the lower end of a flexible helical tube rod 22 with a gripping head 22a can be freely connected to this square head 12d.

In the figure, 23 is a spacer cylinder.

Since the chain fastener of the present invention is constructed as described above, when the timing chain is removed from the cam sprocket toy in FIG. Insert the right presser 19 into one side of the timing chain and the left presser 17 against the other side of the timing chain, and then insert the flexible helical tube rod 22 while grasping the gripping head 22a. When the turning rod 12 is turned clockwise together with the
The upper connecting part 5 is displaced in the direction of the lower connecting part 9 by the vertical screw hole 11 screwed into the upper connecting part 5, and the left pressing part 17 and the right pressing part 19 simultaneously expand outward while reducing the height of the pantograph-shaped member 2. The left presser 17 and the right presser 19, which are pivotally connected at the middle part in the length direction, swing and fit well inside the timing chain, while the right presser 19 pushes one side of the timing chain. is pressed against the chain guide, and the other side of the timing chain is pushed and retreated by the left pusher 17 against the contact roller of the chain tensioner, and by the left pusher 17, the right pusher 19, the chain tensioner, and the chain guide. Timing chain can be fixed.

After doing this, even if the timing chain is removed from the cam sprocket toy, the timing chain is held by the left abutment 17 and the right abutment 19 and will not fall off.

After completing the disassembly work of the valve mechanism, put a timing chain on the cam sprocket toy and turn the turning rod 12 counterclockwise to displace the upper connecting portion 5 away from the lower connecting portion 9 while moving the pantograph-shaped member 2. The height of the timing chain increases, the width decreases, the left presser 17 and the right presser 19 are simultaneously displaced in the approaching direction, the timing chain is returned to the desired tension state, and the left presser 17,
Remove the chain fastener 1 while removing the right pusher 19.

The chain fastener of the present invention has many practical effects such as improving work efficiency by preventing the timing chain from falling off and the chain tensioner from popping out during valve mechanism disassembly work.

[Brief explanation of drawings]

FIG. 1 is an explanatory view of the chain fastener of the present invention applied to a timing chain mechanism, FIG. 2 is a partially cutaway front view of the chain fastener of the present invention, and FIG. 3 is a bottom view of the chain fastener of the present invention. 1... Chain fastener, 2... Pantograph-shaped member, 3... Upper left lever, 4... Upper right lever, 5... Upper connecting portion, 7... Lower left lever, 8... Lower right lever, 9 ...Lower connecting part, 11...Vertical screw hole, 12...Turning rod, 12a
... Male thread part, 15 ... Cap nut, 16 ... Left intermediate connection part, 17 ... Left chain pressing, 18 ...
Right intermediate connection part, 19...Right chain pressing, 20
...Left intermediate pivot joint, 21...Right intermediate pivot joint, I...
...Cam sprocket, B...Crank sprocket, H...Timing chain, D...Chain tensioner, H...Attaching roller, H...Chain guide.

Claims (1)

[Scope of utility model registration request] A vertical threaded hole is provided in the center of the upper connecting part to which the upper end of the pantograph-shaped member is pivotally connected, and the lower end of a rotating rod that screws the male threaded part into this vertical screw hole is rotated to the lower connecting part of the pantograph-shaped member. A chain fastener which can be attached freely, and further comprises a left chain pressing part and a right chain pressing part pivotally connecting a longitudinally intermediate part of the right chain pressing part to the left intermediate pivot part and right intermediate pivot part of the pantograph-shaped member, respectively.