JPS6037480Y2 - chain joint - Google Patents

Description

[Detailed description of the invention] This invention is designed to connect the joint link plate and the pin at the joint of the chain when endlessly connecting a seal chain formed into a continuous length by mutually connecting a roller link and a pin link. Even though the connection is a tight fit, the purpose is to allow the connection to be made using hand tools and not to reduce the sealing performance at the joint.

To describe the chain joint that has been used in the past together with the structure of the chain with reference to Figs. 1 to 3, first, in Figs. A roller 3 is rotatably engaged with the fitted and fixed bushing 2 to form a roller link R, and at each end of a pin 4 that passes through and loosely engages the bushing 2 in this roller link R, Pin link plate 5,5
A pin link P is formed by inserting and attaching the pin link P, and a suitable number of the pin links P and the roller links R are connected to form a chain C having a continuous length.

This continuous length chain C is made into an endless chain by connecting the G-ra links R and R at both ends with a chain joint Ja.

This chain joint Ja is generally called a clip type,
Fitting the narrow diameter portion 7r at one end of the coupling pin 7 into the coupling link plate 6 partially superimposed on the roller link plate 1,
While tightening the tip and fixing it to the joint link plate 6, another joint link plate 8 is loosely connected to the other end of the joint pin 7, and the annular end 17d is secured to the joint link plate 6 using a pair of scissors made of a highly elastic material. The gripping portion 9a and opening 9d of the shaped clip 9 grip the joint link plate 8 to prevent the joint link plate 8 from coming off the joint pin 7.

Furthermore, the chain joint Jb in Fig. 3 is called a choke type, in which one end of a pair of joint pins 11, 11 is inserted into the joint link plate 1o in the same manner as described above, stands upright, and the tips are squeezed to form an integral structure. , a step S on the other side of the joint pin 11.11
, S to form a narrow diameter portion 12.12, so that a joint link plate 13 (described later) can be set at a fixed position, and the holes e, After fitting e, the head 12h is fixed to the joint link plate 13 by fitting it in the direction of arrow U using a fitting tool (not shown).

In the chain joints Ja and Jb described above, one end of the joint pin 7.11 is fitted and fixed, and is fitted to the other end and the joint link plate 8.13. The fit is not as strong as that between the pin 4 and the pin link plate 5 when the pin 4 and the pin link plate 5 are formed.

In other words, the fitting between the pin 4 and the pin link plate 5 and the roller link plate 1 and the bushing 2 is normally made in a state that is stronger than the interference fit specified in the JIS standard. The chain joint Ja or Jb in the endless chain C is particularly likely to break or be damaged because it is fitted by pressing.

In the chain joint Ja, the fitting between the joint pin 7 and the joint link plate 8 is looser than that described above,
In extreme terms, since the joint pin 7 is in a loose state, it is possible to easily fit the joint pin 7 into the joint link plate 8 and then fit the clip 9 into the annular groove 7d with a tool such as pliers. The joint pin 7 that is fixed acts like a cantilever beam, and each time the chain C engages with a chain wheel (not shown), the joint pin 7 hits the bottom of the tooth, and the joint link plate 8 vibrates slightly. Therefore, the clip 9 is constantly pressed outward, and the repeated slight vibrations often cause the clip 9 itself to eventually separate from the joint pin 7, making it unsuitable for high-speed, high-load chains C. It is.

On the other hand, the chain joint Jb is in a more solidly fitted state than the chain joint Ja, but if you consider when using the chain C, it is necessary to use a hand tool such as a bench to attach the joint link plate 13 to the joint pin. It must be possible to easily fit into the pin 11, and it is difficult to maintain the fitting condition similar to press pressing.Moreover, since the tip of the narrow diameter portion 12 of the joint pin 11 is squeezed, it must be able to fit easily into the pin 4. If the hardness, for example, the hardness of the pin 4, is around 50 on the Rockwell hardness C scale HRC, a large force is required to attach the joint pin 11, and attachment using a hand tool is completely impossible.

Therefore, this invention prevents premature breakage of the chain due to defects in the joint portion of the chain as described above, maintains both the joint pin and the joint link plate in a strong fitted state, and improves the relationship between the pin and the bushing. The purpose is to provide a chain joint that can also perform a sealing function in a roller link plate, in which a roller link, which rotatably engages a roller with a bush fitted to a roller link plate, and a pin link, which is made up of a pin link plate and a pin, are mutually connected. A chain joint that connects each end of a seal chain with a roller link plate and a pin link plate with an annular elastic body interposed between the roller link plate and the pin link plate, in which one end is fitted and fixed to one of the joint link plates. A threaded portion is formed on the other end of the pin, and this threaded portion is inserted and protruded into a through hole that is drilled in the other joint link plate and has a diameter smaller than the diameter of the joint pin, and tightening is performed on this protruding portion. The fitting is screwed and tightened to hold the joint pin and the joint link plate in a firmly fitted state, and an annular elastic body is held between the joint link plate and the roller link plate at the end of the seal chain. This is what happens.

The first and second embodiments of this invention will be described below with reference to FIGS. 4 and 5. First, in the first embodiment shown in FIG. Connecting pins 2 with diameters are inserted into through holes f and f on opposite sides, respectively.
1. Fit the narrow diameter parts 21r and 21r at one end of 21,
The heads 21h, 21h are squeezed from the outside to be perpendicular to and fixed to the joint link plate 20°20, while the joint pin 21,
At the other end of each of 21, there is a threaded portion g whose diameter is slightly smaller than the diameter.

Then, the joint pin 21.21 is passed through and engaged with a bush (not shown) having the same structure as that of the roller link R in FIGS. 1 and 2, and the relative of the joint link plate 20.20 is The other diameter Do (Do(1)
The threaded part g9g is inserted into and protrudes from the through hole i of the threaded part g9g, and a nut-like fastener (not shown) is screwed into the protruded threaded part g9g to complete the joint link plates 20, 20. Press down and tighten until the fastener becomes difficult to rotate, and the joint link plate 20.20 and the joint pin 21
．． 21 is firmly fitted in a predetermined position, and the annular elastic body 23 such as an O-ring can be adjusted to a constant amount of crushing, and the elastic body 23 can be firmly fitted to the joint link plate 2 at a predetermined position.
0.20 and the roller link plate 22.

Further, in the second embodiment shown in FIG. 5, the narrow diameter portions 31r, 31r of the joint pins 31.31 are fitted into the pair of through holes j, j formed in the joint link plate 30, respectively. The narrow diameter portions 31r, 31r protruding from the joint link plate 30 are pressed and bonded using a press (not shown), and a pair of parallel joint pins 31. Threaded portions p, p are formed at the tips of the portions 31t, 31t.The joint link plate 32 has a diameter that is slightly smaller than the diameter of the joint pin 31.
It is designed to be inserted into and protruded from the through holes m and m.

When assembling to the chain, as in FIG. 4, after fitting and penetrating the joint pins 31, 31 to the bush (not shown), connect the threaded portions p, p to the through holes m of the joint link plate 32,
A nut-like fastener (not shown) is screwed onto the threaded portions p and p that protrude outward from the waist joint link plate 32, and the joint link plate 32 is pressed. When tightened until it becomes difficult to rotate, the joint link plate 32 and the joint pins 31, 31 are firmly fitted in a predetermined position, and the annular elastic body 23, such as an O-ring, is compressed to a certain amount. It can be adjusted, and the elastic body 23 is sandwiched and brought into close contact with the joint link play) 33.33.

In this invention, a threaded portion is carved into the other end of the coupling pin that fits and secures one end of the coupling link plate, and a through hole of another coupling link plate is inserted into this threaded portion, and a screw protrudes from the through hole. If you screw the fastener into the part and tighten the nut with a spanner, for example, you can visually check the tightening condition, and the joint link plate and joint pin, which are firmly fitted, will gradually tighten like an O-ring. Since the annular elastic body is crushed uniformly, any position that takes into consideration flexibility or the amount of crushing that does not impair sealing performance can be selected.

In addition, although it is a hard fitted state, it can be fitted in the same way as press fitting with hand tools such as nuts and spanners, and the fitted state can be maintained even when the nut is removed, so it is suitable for motorcycles. It is easy to install and repair even during on-site work such as installation and repair, and if there is a problem because the threaded part protrudes from the joint link plate, use a chisel or hammer to attach it to the appropriate place on the protruding part. Just break it.

Furthermore, even with a general roller chain without an O-ring, it is possible to assemble the chain from the beginning without causing stiffness due to bending performance.

In addition, in the chain provided with sealing properties as in the present invention, since an annular elastic body is sandwiched between the joint link plate and the roller link plate at the end of the seal chain, there is no problem at the joint part. By setting the tightening torque in advance and tightening the tool without degrading its performance, it is possible to maintain a constant fit between the joint pin and the joint link plate or the amount of compression of the elastic body. Therefore, while the fitting is tightened using hand tools, a connection similar to that obtained by pressing with a press can be obtained, so that the chain does not break from the joint and contributes to stable transmission of driving force.

[Brief explanation of drawings]

Figure 1 is a partially cutaway plan view of the main part of an endless chain when a conventional chain joint is used, Figure 2 is a front view of Figure 1, and Figure 3 is the chain joint shown in Figure 1. FIG. 4 is a partially cutaway plan view of different types of chain joints; FIG. 4 is a partially cutaway sectional view of the first embodiment of the invention; FIG.
The figure is a sectional view of the second embodiment. 20.30,32...Joint link plate, 2
1.31...Joint pin, 22,33...
Ta-ra link plate, 23, 34...Elastic body, g, p...Threaded part.

Claims (1)

[Scope of utility model registration request] A roller link, in which a roller is rotatably fitted to a bushing fitted to a roller link plate, and a pin link, which is made up of a pin link plate and a pin, are interconnected, and an annular ring is connected between the roller link plate and the pin link plate. In a chain joint that connects the ends of a sealed chain with an elastic body interposed, one end of the joint pin is inserted and fixed into one joint link plate, and the other end of the joint pin is formed with a threaded part, and this threaded part is connected to the other end of the joint pin. It is inserted into the through hole that is drilled in the joint link plate and has a diameter smaller than the diameter of the joint pin.
The joint pin and the joint link plate are held in a firmly fitted state by screwing and tightening the fastener to the protruding part, and the joint link plate and the roller link plate at the end of the seal chain. A chain joint with an annular elastic body sandwiched between the two.