JPS609670A - Jig for connecting chain - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chain connecting jig, and more particularly to a chain connecting jig suitable for connecting a cam chain of a vehicle or the like in a narrow space.

Chains are widely used as a power transmission means, and these chains are made of strips connected at predetermined points and set on sprockets on the drive side and driven side for driving. However, during this assembly, the chain may be made to a predetermined length and the connecting parts of the chain connection portion may be caulked from both sides to secure the chain. In this case, the space for assembly is small, and if the connecting parts are small and numerous, it is difficult to obtain an accurate temporary assembly of the connecting parts, and it takes a long time to complete the process. cannot be connected.

This invention was made against the background of the above circumstances, and it provides a chain connection that allows temporary assembly of chain connection parts in a narrow space easily and accurately, and allows the chain to be connected by caulking in a short time. This relates to tools for use.

To achieve the above object, the present invention connects a pair of caulking bodies made of block material through an inner guide shaft, and provides at least one of these caulking bodies so as to be slidable on the guide shaft. A sliding caulking body is biased by a spring toward the opposing caulking body, and each of these caulking bodies has a recess formed in the opposing portion to caulk the connection of the chain, so that pressure is applied from the outside. It is characterized by

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings. FIG. 1 shows a plan view of an engine to which a chain is attached, and FIG. 2 shows an enlarged plan view of a connecting portion of the chain. This engine A is a 4% WII engine, and is equipped with an overhead cam valve system in which a pair of camshafts 1 and 2 having cams la and 2a are disposed in parallel above the cylinder head l. This camshaft 1
．． A sprocket 4.5 is provided in the center of 2, and this sprocket 4.5 is connected to a crankshaft (not shown) which is rotated by a piston driven by a cam chain 6.
This is a center cam chain system that transmits the rotational force of the crankshaft to the camshaft 1.2 to drive the cam. The cam chain 6 is a silent chain that does not have rattling and generates little noise.

The cam chain 6 is cut to a predetermined length, and the connection portion shown in FIG. 2 is positioned on the M1 vertical line of the engine A to the sprockets 1-4 and 5flJI.

Then, attach the three wooden link plates 7 between the already connected link plates 8, and insert the connecting pins 0 with the joint links 9 fixed into the pin holes 7a and 8a of the link plates 7 and 8 from both sides. , are fitted into pin holes 9a of opposing joint links 9, respectively. Then, the chain connecting jig B is inserted into the narrow space between the sprockets 4 and 5 above the cylinder head 3, the connecting portion is sandwiched from both sides, and the connecting pin 10 is caulked using the pressing device C to connect the chain connecting jig B.

As shown in FIGS. 3 and 4, the chain connection jig B has a pair of clamping bodies 13 and 14 formed of block material connected via a pair of parallel guide shafts 11 and 12. The caulking body 13.14 is arranged axially slidably on the guide shaft 11.12. and caulking body 1
3.14 is formed wider than the width of the pair of connecting pins 10 inserted into the connection portion of the cam chain 6, and recesses 15 and 16 are formed in the opposing portions. This recess 15,
16 includes both ends 10a, 1 of the connecting bottle 10 of the connecting part.
Taper-shaped grooves 15a and 16a are formed in which 0a abuts, and by pinching the caulking bodies 13 and 14, both ends 1
0a and 10b are caulked. A spring 17 is wound around one of the guide shafts 11 in a compressed manner between the caulking body 13 and the locking member 18. Caulking body 1
3 is always biased by this spring 17 in the direction of the other opposing caulking body 14. As a result, when the connecting portion is sandwiched between the caulking bodies 13 and 14 during one assembly, accurate temporary assembly can be maintained by the spring 17 until pressure is applied from both sides of the press device C. In this state, the recess 15 of the caulking body 13.14,
The width a of 1.6 is the assembly width of the connection part, and the caulking body 13.14
The gap C serves as an allowance for press-fitting and caulking the connecting bottle IO. Further, the widths of the recesses 15 and 1B accurately hold the caulking position of the connecting bottle 10, which makes temporary assembly easy and reliable, and ensures the performance of the chain after connection.

As shown in FIGS. 5 to 7, the press device C has a main body 19 suspended by an upper metal fitting 20, and is operated on an assembly line by holding grips 21 on both sides thereof. At the bottom of this main body 19, there is a fixing part 22 that sandwiches the caulking body 13, 14 of the chain connection jig B therebetween, and a sliding part 2.
3. The slide portion 23 is slidably provided on a pair of guide portions 24 having an angular cross section formed at the bottom of the main body 19, and a pair of rods 26 are provided on both sides of a cam 25 that pushes the slide portion 23. is supported by the main body 19. On one of the rods 26, a spring 27 is compressed between the side of the main body 19 and the head 26a.
The slide portion 23 is always urged in the backward direction.

The cam 25 is rotatably supported by a shaft 28 provided on the main body 19, one end 25a abuts the slide portion 23, and the other end 25b abuts the piston 29. This piston 29 is slidably fitted into a cylinder 30 provided at the center of the main body 19, and moves forward by the supply of hydraulic fluid to rotate the cam 25 clockwise, thereby moving the slide portion 23 to the piston 29. The caulking bodies 13 and 14 located between the fixing part 22 and the fixing part 22 are pressed. This completes the press-fitting and caulking of the connecting pin 10 of the connecting portion of the cam chain 6, and when the hydraulic pressure of the hydraulic fluid is released, the slide portion 23 is returned to its original position by the spring 27, and the piston 29 is returned to its original position by the spring 31. .

Note that the connected chain is not limited to the above-mentioned silent chain. Further, the place where the chain is used is not limited to engine cam chains, but can be widely applied to chains used in narrow places. Furthermore, the press device is not limited to the one described above.

As described above, this invention uses a spring to bias the sliding crimping body in the direction of the opposing crimping body, and the opposing parts of the crimping body each have four parts for crimping the connection part of the chain. Temporary assembly is easy when connecting the chain, and the caulking position can be maintained accurately until pressing, improving workability and chain performance. In addition, since the chain connection jig does not have a press mechanism, the device becomes smaller, and the chain connection jig can be inserted into a narrow space and the crimped body can be compressed with a press device, making it suitable for use in narrow spaces. suitable.

[Brief explanation of drawings]

Fig. 1 is a partially sectional plan view of an engine in which the present invention is used, Fig. 2 is an enlarged plan view of a chain connection section, Fig. 3 is a sectional view of a chain connection jig, and Fig. 4 is a chain 5 to 7 show the press device, FIG. 5 is a sectional view, FIG. 6 is a bottom view, and FIG. FIG. B...Chain connection jig C...Press device 6
...Cam chain 11.12...Guide shaft 13.1
4... Caulking body 5, 16... Recessed portion 17... Spring Patent applicant Yamaha Motor Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] A pair of caulking bodies made of block material are connected via an inner guide shaft, at least one of these caulking bodies is provided so as to be slidable on the guide shaft, and the sliding caulking bodies are opposed by a spring. A jig for connecting a chain which is biased in the direction of the caulking body, and each caulking body of the bracket has a concave portion formed in the opposing part for caulking the connecting part of the chain, and is pressed from the outside.