JPH0647626Y2 - Roller chain joint press-fitting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a seal type roller chain joint press-fitting device for manually connecting a roller chain of a predetermined length to form an endless chain.

<Prior Art> Generally, in assembling a seal-type roller chain on the factory side, a linking pin and a link plate are connected through an automatic press-fitting process using a predetermined assembling device to form a chain assembly. However, when this type of roller chain set to a fixed length is endlessly assembled on site each time, extremely troublesome work is required (for a roller chain with an O-ring, the plate and link pin There are conditions that require the fitting to be press-fitted.) Of course,
While it is possible to purchase and work on an expensive fitting-only device, it is not possible to use a fitting-only device for several uses. For this reason, there are various joint press-fitting means that facilitate the connection work and ensure the sealing, but still no simple and reliable means has appeared. For example, in the press-fitting joint for a roller chain of Japanese Utility Model Publication No. 57-55563, when one pink link plate a is press-fitted into the link pin b as shown in FIG. 11, the structure of the link pin b is Is formed with a long auxiliary rod c which becomes a bent piece, and a constricted portion d and a screw portion e are formed on the outer side of the base rod at a position to be a plate fitting end and screwed into the screw portion e. With the pressing of the nut f, the pink link plate a previously fitted in the constricted portion d is press-fitted into the link pin b, and finally, the constricted portion d is used as a boundary to fold down the tip auxiliary rod c side.

<Problems to be solved by the invention> However, as described above, the pink link plate a, which is a strength member of the chain, has a large plate thickness, so that the pink link plate a having a smaller diameter than the link pin b is fitted. When press-fitting the fitting hole a ′, an extremely large rotational force has to be applied to the nut f, which is not a simple press-fitting means. Moreover, in this case, both fitting holes a ', a'of the link plate a
On the other hand, the two link pins b, b must be faced in parallel, which is also a troublesome work. Further, unless the length of the threaded portion e is made long to some extent, the nut f cannot be screwed securely, and the production of the constricted portion is complicated.

In view of the above situation, the present invention uses a thin plate (washer) as a member that directly presses the O-ring to minimize the press-in force, loosens the fitting of the link plate, which is a strength member of the chain, to the link pin, and connects it. An object of the present invention is to provide a roller chain joint press-fitting device that facilitates work.

<Means for Solving the Problems> The present invention is an oil-sealed roller chain including a link pin, an outer plate (pin link plate), an inner plate (roller link plate), and an O-ring interposed between the plates. In the above, a link pin, which is preliminarily press-fitted into one of the outer plates, has a length up to the fitting position end face of the joint plate that serves as the outer plate to be fitted in the other pin, and a press-fitting screw portion is formed at this tip. As a pin
The O-ring sandwiching member facing the outside of the inner plate that is press-fitted into the pin main body is a press-fitting washer that is thinner than the plate, and a press-fitting nut body that is screwed into the screw portion that presses the press-fitting washer is provided on at least one side of the plate thickness. It is a detachable type in which a washer press-fitting regulation loose fitting portion having a step portion inside is formed, and has a joint plate that is loosely fitted to the outside of the washer that is press-fitted in a predetermined position, and a slip prevention means that is arranged outside the joint plate. It will be configured.

<Operation> Due to the above-mentioned configuration, when connecting the roller chains, a joint pin press-fitted to one outer plate is inserted through a bush that is inserted between both inner plates through an O-ring, and Another O-ring is arranged on the projecting portion of and the thin plate washer having a hole having a slightly smaller diameter is brought into contact with the pin main end. In this state, if the press-fitting nut body is screwed into the screw part protruding from the washer and the screw is fed, the washer is press-fitted into the pin main body, and the edge of the pin main body is in contact with the stepped portion inside the press-fit nut body. Then, the washer gets a specified amount of press-fit, and the O-ring is pressed to hermetically seal the bush rim. After that, remove the press-fit nut body, loosely fit the joint plate with a hole with a diameter slightly larger than this shaft diameter to the pin main body of the washer end, and provide a cotter pin or other slip prevention means on the outside. It becomes a joint connection.

<Embodiment> Hereinafter, the present invention will be described in detail with reference to the drawings of an embodiment.

Reference numeral 1 denotes a bush 4 having a roller 3 provided between two inner plates 2 and a link pin 5 having oil a applied to a bush 4, and an outer plate having O-rings 6 at both ends of the link pin 5. 7 is a roller chain in which 7 are press-fitted and sequentially connected, and the endless connection of the roller chain 1 is achieved by mechanically press-fitting one end of two link pins 5 to both ends of one outer plate 7 in advance by separate means. , Fit the O-ring 6 inside.
In this case, the structure of the link pin 5 is such that the pin main body 9 having a length up to the joint plate 8 which becomes the outer plate 7 fitted to the other
Then, the joint pin 12 is formed with a press-fitting screw portion 10 formed by laterally forming a split pin hole 11 at this tip. Reference numeral 13 denotes a press-fitting washer which is a thin plate having a thickness of about 1/4 of that of the joint plate 8 which is press-fitted to the end of the pin main body 9 and which has a hole 13 of the press-fitting washer 13.
The diameter of a is a press-fit structure having a diameter slightly smaller than the pin main body 9. Further, the diameters of the two fitting holes 8a of the joint plate 8 are conversely slightly larger than the diameter of the pin main body 9 to provide a loose fitting structure. Reference numeral 14 is a press-fitting nut body that is screwed into the threaded portion 10. On one side of the press-fitting nut body 14, there is formed a washer press-fitting regulation loose fitting portion 15 for guiding the end of the pin main body 9, and this step portion 15a
The depth l of the plate is equivalent to the plate thickness. Reference numeral 16 is a split pin that serves as a slip-prevention means that is inserted into the split pin hole 11.

To explain this action, first, in connecting the roller chain 1, at the bush 4 portion of the opposing inner plate 2 which is the chain end on one side, the link pin press-fitted to one outer plate 7 which is a joint piece. Insert the joint pin 12 to be 5, insert the O-ring 6 into the pin main body 9 portion of the joint pin 12 protruding from the end of the bush 4, and press fit the washer to the end of the main body 9 of the pin.
The hole 13a of 13 is brought into contact. Under this state, the press-fitting nut body 14 of the threaded portion 10 at the tip of the pin main body 9 is attached to the loose fitting portion.
If 15 is screwed in, the end face 14a of the press-fit nut body 14
The press-fitting washer 13 is pressed by and is pressed into the pin main body 9. However, the degree of screw insertion of the press-fit nut body 14 is such that the diameter of the pin main body 9 is larger than that of the screw portion 10 in the step portion 15a of the loose fitting portion 15.
It stops at the position where the end edge 9a, which is the shoulder portion of, touches. At this time, the press-fitting amount of the press-fitting washer 13 becomes the specified position, and the inside O
The ring 6 seals the rim 4a of the bush 4.
Of course, due to the pulling of the pin main body 9, the sealing action also acts on the other O-ring 6 which is previously fitted on the opposite side.

After that, even if the press-fitting nut body 14 is removed, the press-fitting washer 13 does not return due to the press-fitting lock and maintains a reliable seal. The length of the pin main body 9 with the press-fit nut body 14 removed is
Since the depth 1 of the loose fitting part 15 of is the plate thickness,
Exposed plate thickness. Therefore, the fitting hole 8a of the joint plate 8 may be fitted into the end portion 9a of the pin main body 9. Since the fitting hole 8a has a diameter larger than the diameter of the pin main body 9 by about 3/100 to 5/100, it is loosely fitted. That is, the fitting of the thick joint plate 8 which becomes the strength member of the chain becomes easy. Finally, the cotter pin 16 is inserted into the cotter pin hole 11 at the base end of the screw portion 10 protruding from the surface of the joint plate 8 and the tip is expanded to prevent the joint plate 8 from being displaced. This slip prevention means
Various means other than the split pin 16, such as snaps and S pins, may be provided. When fitting the joint plate 8 to the joint pin 12, the other joint pin 12 is previously attached to the inner plate facing the joint plate 12.
Insert the bushes 2 and 2 into the bushes 4 and also project the end 9a of the pin main body, and insert the joint plate 8 into the two pin main bodies 9 and 9.
The fitting holes 8a, 8a may be fitted all at once, or the joint plate 8 may be fitted on one joint pin 12 and the split pin 16 may be engaged, and then the other joint pin 12 may be inserted and engaged. .

7 to 10 show another embodiment of a small roller chain in which the screw portion 10 has a short projection. In this case, the press-fitting nut body 14 is configured so that the threaded portion 10 at the end of the pin main body 9 of the joint pin 12 projecting from the end of the bush 4 can be screwed. That is, on one side of the press-fit nut body 14, a washer press-fitting regulation loose fitting portion 15 having a step portion 15a having a depth 1 similar to the plate thickness is formed on one side, and the press-fit nut body 14 is formed.
On the other side (opposite side), a loose fitting portion for setting 17 having a depth l'which is at least larger than the washer plate thickness is formed so that initial washer press-fitting can be dealt with.

In the use of this embodiment, first, as in the above, the joint pin which becomes the ring bin 5 press-fitted into the one outer plate 7 is formed.
Insert 12 into the bush 4 connecting the inner plates 2 and 2, and fit the O-ring 6 into the pin main body 9 protruding from the other end.
The hole 13a of the press-fit washer 13 is brought into contact with the end of the pin main body 9. In this state, first, the press-fitting nut body 14 is put on the press-fitting washer 13 with the end surface 14b having the loose fitting portion 17 for setting which is the shallow groove, and the press-fitting nut body 14 is turned to obtain the end surface.
By pressing the press-fitting washer 13 with 14b, the nut screw portion 18 is immediately screwed into the screw portion 10 of the joint pin 12, and the thin-plate press-fitting washer 13 is press-fitted into the pin main body 9 end. After this (at a point where the press-fitting washer 13 has been slightly press-fitted), once remove the press-fitting nut body 14 and insert the washer press-fitting regulation loosely fitting part 15 into the opposite direction, the threaded part 10 will be removed in the same manner as the above process. Since the position is extended from the end of the press-fitting washer 13, even in the joint pin 12 of a small chain having a short length of the threaded portion 10, the threaded portion 10 is screwed into the nut threaded portion 18 at the back at a predetermined depth l. The press-fitting nut body 14 is screwed until the press-fitting nut body 14 stops (until the edge 9a of the pin main body 9 abuts on the step portion 15a), and then the press-fitting nut body 14 is removed, and the press-fitting washer is press-fitted in a specified amount. Up to 13, the joint plate 8 may be loosely fitted to the pin main body 9, and finally the split pin 16 serving as a stop pin may be inserted into the split pin hole 11.

<Effect of device> As described above, the roller chain joint press-fitting device of the present invention is
The press-fitting member that directly contacts the O-ring facing the bush end between the inner and outer plates has a thin press-fitting washer that can be press-fitted (easy) to the joint pin, and becomes a thick pin link plate that serves as a chain strength member. Since the fitting with respect to the joint pin is a loose fitting, the press-fitting force applied to the press-fitting nut body that directly presses the press-fitting member is small and the workability is good. Moreover, in this case, since the press-fitting nut body is provided with the loose fitting portion having the plate thickness of the plate, the press-fitting nut body should always be pushed in until it comes into contact with the pin main body edge of the joint pin, and is easy from this point as well. is there.
That is, the specified press fit of the press fit washer can be easily performed. Further, in the present invention, since press-fitting of a press-fitting washer of a thin plate is required, press-fitting can be performed for each pin, which does not require skill. Of course, in a small roller chain having a short press-fitting screw part, a press-fitting nut body having a loose fitting part for setting may be used. Moreover, since the present invention has a simple structure and is compact, it can be easily installed on site, and has practical effects such as pliers and a vise having a minimum tool.

[Brief description of drawings]

FIG. 1 is a separated plan view showing a position embodiment of the present invention, FIG. 2 is a front view of a press-fitting washer, FIG. 3 is a sectional view of a press-fitting nut body, and FIGS. Explanatory drawing, FIG. 6 is the same front view, FIG. 7 is a separated plan view showing another embodiment, FIG. 8 is a sectional view of the same press-fitting nut body, and FIGS. Explanatory drawing, FIG. 10 is a partially cutaway plan view of the same assembly, and FIG. 11 is an explanatory view of a conventional product. 1 ... Roller chain, 2 ... Inner plate, 5 ... Link pin, 6 ... O-ring, 7 ... Outer plate, 8 ... Joint plate, 9 ... Pin body, 10 ... Press-fitting screw part, 12
...... Coupling pin, 13 ...... Press-fit washer, 14 ...... Press-fit nut body, 15 …… Washer press-fitting regulation loose fitting part.

Claims (1)

[Scope of utility model registration request] 1. A seal-type roller chain comprising a link pin, an outer plate, an inner plate, and an O-ring interposed between the plates, and an outer plate in which a link pin press-fitted to one outer plate is fitted to the other plate. The length of the joint plate up to the end of the fitting position is the joint pin with the pin as the main body and the tip as the press-fitting screw part. The press-fitting washer for clamping the O-ring that press-fits into the main body of the pin and the press-fitting washer are pressed. A press-fitting nut body having a washer press-fitting regulation loose fitting portion having a plate thickness on at least one side that is screwed into the threaded portion, a joint plate that is loosely fitted to the outside of the press-fitting washer at a predetermined position, and the joint plate is prevented from shifting. Roller chain joint press-fitting device consisting of means.