JP3113871U - Motorcycle chain changer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To replace a chain for a motorcycle capable of improving workability, preventing damage to parts, reducing the number of parts, and reducing manufacturing cost and improving handling as compared with conventional ones. Providing tools.
A substantially H-shaped changer body in front view, a pin removing bolt, a pin holding bolt, a chain fixing bolt, a pin caulking bolt, a pin press-fitting bolt, a press-fitting inner guide, It consists of a press-fit guide pin, and the chain fixing bolt consists of one bolt whose shaft part is shorter than the shaft part of the pin removal bolt, and the press-fit inner guide is 2 according to the chain pin interval. The press-fitting guide pin is longer than the thickness of the other vertical plate part of the other U-shaped part and smaller in diameter than the through-hole of the inner guide for press-fitting. It was comprised so that it might have two guide pins which have the front-end | tip part.
[Selection] FIG.

Description

  The present invention relates to a motorcycle chain changer, and more particularly to a motorcycle chain changer that allows one to easily and reliably change a motorcycle chain.

Motorcycle chains are subject to deterioration over time, such as wear, with use, and therefore need to be replaced about every 10,000 cycles. Usually, when it is necessary to change the chain, it is often brought into the store and asked to be changed by the store, but there are many people who want to change the chain by themselves. Various chain changers are commercially available for this purpose.
However, the conventional chain changers are complicated in shape and structure and have a large number of parts, so the price has to be somewhat high. In order to replace the chain, the changer is several times the price of the chain. Had to be purchased, which put a heavy burden on those who wanted to replace the chain themselves.
Moreover, in the conventional chain changer, it is necessary to remove the chain from the vehicle body (gear) and perform the exchange work in an unstable state in which the chain swings swaying. He was not good enough and required skill.
As a technique proposed in view of such circumstances, there is a motorcycle chain changer disclosed in Patent Documents 1 and 2 below.

The chain changer disclosed in Patent Document 1 was very excellent in both price and workability compared to conventional commercial products, but there is still room for improvement in terms of workability. It was.
That is, the chain exchange operation is performed in two steps of chain cutting and connection, or three steps of cutting and connection and caulking. Since it was configured to be performed in a U-shaped space, it was necessary to remove all the inserted bolts every time the next process was performed, and the work of removing and inserting the bolts was very troublesome.

  The chain changer disclosed in Patent Document 2 is provided with a U-shaped space for cutting and caulking the chain and a U-shaped space for connecting the chain separately by making the overall shape H-shaped. As a result, the present inventors have succeeded in solving the problems of the disclosed technology of Patent Document 1.

However, the chain changer disclosed in Patent Document 2 also has some problems as described below.
First, in the chain cutting process, it is necessary to pull out the two pin fixing bolts and screw the two pin fixing bolts into, so the operation is very troublesome and the workability is poor. . Further, there is a possibility that the changer may fall off when the pin fixing bolt is pulled out after removing the pin. Furthermore, the number of parts is increased, handling is poor, and the manufacturing cost is increased.
Second, in the chain connecting process, the pin press-fitting bolt or the press-fitting plate may be refracted by overtightening the pin press-fitting bolt.
Third, in order to fix the press-fitting outer guide in place, the press-fitting outer guide fixing bolt is used, but if the tightening is insufficient, it will move when the pin press-fitting bolt is tightened. There was a risk of it.
Fourthly, the tip of the pin press-fitting bolt was worn with use, and the press-fitting inner guide and press-fit plate could not be pushed in correctly. Moreover, since the inner guide for press-fitting is provided with a through hole for inserting the tip of the pin press-fitting bolt at the center thereof, it is easily refracted by the pressing force from the pin press-fitting bolt.

Utility Model Registration No. 3034302 Utility Model Registration No. 3067044

  Compared to conventional chain changers, the present invention can improve workability, hardly damage parts, and can easily and reliably change the chain by one person. It is an object of the present invention to provide a motorcycle chain changer that can be reduced to achieve a reduction in manufacturing cost and an improvement in handling.

  The invention according to claim 1 is a front view substantially H-shaped changer body composed of two vertical plate portions facing each other and a horizontal plate portion connecting the two vertical plate portions, a pinning bolt, A chain changer for a motorcycle comprising a pin presser bolt, a chain fixing bolt, a pin caulking bolt, a pin press-fitting bolt, a press-fitting inner guide, and a press-fitting guide pin. Of the two U-shaped parts opposite to each other formed by the plate part and the two vertical plate parts, one U-shaped part is used as the chain cutting part and the caulking part, and the other U-shaped part is connected to the chain. The vertical plate portion of the one U-shaped portion is provided with a screw hole and a hollow portion that can be screwed with the pin holding bolt at a position facing the two screw holes. The other vertical plate part has the above-mentioned pinning bolt and pin caulking bolt. Two screw holes that can be screwed to the chain are provided in accordance with the pin interval of the chain, and one vertical plate portion of the other U-shaped portion has a chain on a surface facing the other vertical plate portion. Two recesses are provided in accordance with the pin interval, and the other vertical plate is provided with an insertion hole through which the press-fitting bolt and the press-fitting guide pin can be inserted at a position facing the two recesses. The pinning bolt has a shaft portion whose length is longer than the thickness of one vertical plate portion of the one U-shaped portion and a non-threaded portion whose outer diameter is equal to or less than the pin diameter of the chain at the tip. And the non-threaded portion has two different bolts, and the pin retainer bolt has a shaft portion with a thickness of one vertical plate portion of the one U-shaped portion. The chain fixing bolt is composed of a substantially equal bolt, and the length of the shaft portion is the pin removing bolt. And a pin that is longer than the thickness of the other vertical plate portion of the one U-shaped portion. The pin caulking bolt has a length of the shaft portion of the one U-shaped portion. It consists of two bolts longer than the thickness of the other vertical plate portion of the U-shaped portion, and the pin press-fitting bolt is longer than the thickness of the other vertical plate portion of the other U-shaped portion, and is inserted into the insertion hole. The press-fitting inner guide is made of a flat plate member having two through holes in accordance with the pin interval of the chain, and the press-fitting guide pin is made of the other screw. The present invention relates to a motorcycle chain changer characterized by having two guide pins that are longer than the thickness of the other vertical plate portion of the U-shaped portion and have a tip portion having a smaller diameter than the through hole of the press-fitting inner guide.

  The invention according to claim 2 relates to the chain changer for motorcycles according to claim 1, wherein the front end surface of the chain fixing bolt is a curved concave surface that can be brought into close contact with the pin head of the chain. .

  The invention according to claim 3 is interposed between the head of the pin press-fitting bolt and the other vertical plate portion of the other U-shaped portion, and press-fits the pin from the inner surface of the other vertical plate portion. The motorcycle chain changer according to claim 1 or 2, further comprising a washer that regulates a length by which a shaft portion of the bolt is protruded.

  The invention according to claim 4 is characterized in that the press-fitting guide pin comprises two separate guide pins each having a threaded portion that can be screwed into the insertion hole on the base end side. 3. The motorcycle chain changer according to any one of 3 above.

  In the invention according to claim 5, a recess is provided between the two through holes of the press-fitting inner guide, and a sphere that is in contact with the recess is embedded at the tip of the pin press-fitting bolt. The motorcycle chain changer according to any one of claims 1 to 4, wherein the hardness of the sphere is greater than the hardness of the bolt.

According to the first aspect of the present invention, the chain cutting operation and the caulking operation can be separately performed with one U-shaped portion and the chain connecting operation can be performed separately with the other U-shaped portion. The number of insertions and removals is small, and the work efficiency is very good.
Further, since the exchange operation of the chain can be performed in a state where the exchange body is fixed to the chain and the chain rear gear, the chain can be exchanged reliably and easily in a stable state.
In addition, since the shape and structure of the chain changer is simple, it can be manufactured easily and inexpensively, and there is no risk of confusion due to incorrect use during work. Versatile because it can handle both joints.
Furthermore, in the chain cutting process, the pin fixing bolt can be removed by inserting and removing the other pin while fixing one pin at the chain connecting part using the chain fixing bolt. Since the chain can be cut without need, the workability is very good. Moreover, even when the pin is removed, the exchanger main body is fixed to the chain by the chain fixing bolt, and there is no possibility of dropping off.
In addition, since the number of pin fixing bolts can be reduced, the number of parts is reduced, the handleability is improved, and the manufacturing cost can be reduced.

  According to the second aspect of the present invention, since the front end surface of the chain fixing bolt is a curved concave surface that can be brought into close contact with the pin head of the chain, the pin head escapes from the front end of the bolt when tightened. Is prevented, and the chain can be cut securely without the need for a pin fixing bolt.

  According to the third aspect of the invention, the length by which the shaft portion of the pin press-fitting bolt protrudes from the inner surface of the other vertical plate portion is restricted by the washer. Therefore, in the chain connecting process, the pin press-fitting bolt is tightened. It is possible to prevent excessive insertion, and the inner guide for press-fitting and the press-fitting plate are not refracted.

  According to the fourth aspect of the present invention, the press-fitting guide pin is composed of two independent guide pins having screw portions that can be screwed into the insertion hole on the base end side. Can be securely fixed in place and will not move when the pin press-fitting bolt is tightened.

  According to the fifth aspect of the present invention, since a hard sphere is embedded at the tip of the pin press-fitting bolt, wear of the tip is prevented, and the inner guide for press-fitting and the press-fitting plate are provided over a long period of time. Can be pushed in accurately. Further, since it is not necessary to form a through hole in the press-fitting inner guide, it is possible to prevent refraction due to the pressing force from the pin press-fitting bolt.

Hereinafter, a preferred embodiment of a motorcycle chain changer according to the present invention will be described with reference to the drawings.
1 and 2 are a left perspective view and a right perspective view, respectively, showing a changer body (2) of a motorcycle chain changer (1) according to the present invention.
The exchanger body (2) is composed of two vertical plate portions (21) facing each other in parallel and a horizontal plate portion (22) connecting the two vertical plate portions, and is substantially H in front view. It has a shape.
Of the two U-shaped portions opposite to each other formed by the two vertical plate portions (21) and the horizontal plate portion (22) of the exchange body (2), one U-shaped portion (23) is a chain. A cutting part and a caulking part are formed, and another U-shaped part (24) forms a chain connection part.

One vertical plate portion (21a) constituting one U-shaped portion (23) is provided with one screw hole (211) and one hollow portion (216) in accordance with the pin interval of the chain. . In addition, the hollow part (216) is formed in the inner surface (opposite surface with another vertical plate part (21b)) of one vertical plate part (21a).
The other vertical plate portion (21b) is provided with two screw holes (212) at positions facing these screw holes (211) and the recessed portions (216).

In one vertical plate portion (21c) constituting the other U-shaped portion (24), two recess portions (213) are provided on the surface facing the other vertical plate portion (21d). The other vertical plate portion (21d) is provided with two screw holes (215) at positions facing the two recess portions (213), and a screw screw is provided at an intermediate position between these two screw holes (215). A hole (214) is provided.
One vertical plate portion (21a) and one vertical plate portion (21c) continuously form one vertical plate portion, and the other vertical plate portion (21b) and the other vertical plate portion (21d) are continuous. The other vertical plate portion is formed.

  Moreover, the screw hole (221) which penetrates the approximate center of a horizontal-plate part (22) is formed in the exchanger main body (2).

FIG. 3 is a perspective view showing a press-fitting inner guide (3) of a motorcycle chain changer (1) according to the present invention, and FIG. 4 is a cross-sectional view thereof.
The press-fitting inner guide (3) has a flat plate shape as shown in the figure, and two through holes (31) are provided in accordance with the pin interval of the chain. And the hollow part (32) is provided in the intermediate part of these two through-holes (31).

FIG. 5 is a perspective view showing the press-fitting guide pin (4) of the motorcycle chain changer (1) according to the present invention.
The press-fitting guide pin (4) is composed of two separate and independent guide pins, and the length thereof is longer than the thickness of the other vertical plate portion (21d) of the other U-shaped portion.
The press-fitting guide pin (4) includes a screw portion provided on the proximal end side and a non-threaded portion provided on the distal end side, and the screw portion can be screwed into the screw hole (215), The length is set to be approximately equal to that of the other vertical plate portion (21d).
The diameter of the non-threaded portion of the press-fitting guide pin (4) is slightly smaller than the diameter of the through-hole (31) of the press-fitting inner guide (3). A tapered portion having a substantially conical shape that gradually decreases in diameter is formed.

FIG. 6 is a side view showing the pinning bolt (5) of the motorcycle chain changer (1) according to the present invention.
The pinning bolt (5) is composed of two types of bolts (5a) and (5b) having different shaft lengths, and both bolts have a length of the shaft portion and one vertical plate of one U-shaped portion. It is made longer than the thickness of a part (21a).
The pinning bolt (5) has a non-threaded part (51) from the midway part to the tip, and the outer diameter of the non-threaded part (51) is slightly smaller than the pin diameter of the chain.
The two types of bolts (5a) and (5b) have the same thread length and different non-thread (51) lengths. In the longer bolt (5b), the non-thread (51) is a chain. It is formed longer than the pin length.
These threaded portions of the pinning bolt (5) can be screwed into the screw hole (212) of the exchanger body (2).

FIG. 7 is a side view showing the pin retainer bolt (6) of the motorcycle chain changer (1) according to the present invention.
The pin retainer bolt (6) consists of a single bolt whose tip is approximately the same diameter as the pin diameter of the chain, and is the length of the shaft that combines the threaded portion (61) and the non-threaded portion (62). The length is substantially the same as the thickness of one vertical plate portion (21a) of the exchanger body (2).

FIG. 8 is a side view showing the pin press-fitting bolt (7) of the motorcycle chain changer (1) according to the present invention.
The pin press-fitting bolt (7) is formed from one bolt whose shaft portion is formed longer than the other vertical plate portion (21d) of the other U-shaped portion and can be screwed into the screw hole (211). Become.
The pin press-fitting bolt (7) has a spherical body (71) for bearings or the like embedded at the tip, and the spherical body (71) having a hardness greater than that of the bolt is used. The sphere (71) is fitted into and abutted with a recess (32) provided in the press-fitting inner guide (3).
This pin press-fitting bolt (7) can be screwed into the screw hole (214) of the exchanger body (2).

FIG. 9 is a side view showing the pin caulking bolt (8) of the motorcycle chain changer (1) according to the present invention.
The pin caulking bolt (8) is composed of two bolts having a shaft portion longer than the thickness of the other vertical plate portion (21b) of the U-shaped portion.
These pin caulking bolts (8) can be screwed into the screw holes (212) of the exchange main body (2), and the ball for bearings having a diameter larger than the depression at the tip of the chain pin ( 81) is buried.
Thus, by embedding the ball sphere for bearing (81) having high hardness and extremely small surface roughness at the tip of the pin caulking bolt (8), the pin is not damaged during pin caulking work described later. Caulking can be performed smoothly and wear of the tip can be prevented.

FIG. 10 is a side view showing the chain fixing bolt (9) of the motorcycle chain changer (1) according to the present invention.
The chain fixing bolt (9) has a shaft portion shorter than the shaft portion of the pinning bolt (5) and longer than the thickness of the other vertical plate portion (21b) of one U-shaped portion. It consists of a bolt.
Moreover, the front end surface of the chain fixing bolt (9) is a curved concave surface that can be brought into close contact with the pin head of the chain.

FIG. 11 is a plan view showing the washer (16) of the motorcycle chain changer (1) according to the present invention.
The washer (16) is composed of at least two or more flat washers.
The washer (16) is loosely fitted to the shaft portion of the pin press-fitting bolt (7), and the head of the pin press-fitting bolt (7) and another vertical plate portion (21d) of the other U-shaped portion. It is inserted between.
As a result, it is possible to regulate the length by which the shaft portion of the pin press-fitting bolt (7) protrudes from the inner surface of the other vertical plate portion (21d), and change the number of washers (16) to be interposed. Thus, the protruding length can be adjusted.

Hereinafter, a method of using the motorcycle chain changer (1) according to the present invention will be described.
First, a chain cutting method using the motorcycle chain changer (1) according to the present invention will be described with reference to FIGS.
When the chain is cut using the motorcycle chain changer (1), first, at the position where the chain is hung on the rear gear, as shown in FIG. 12, one U-shaped portion of the changer body (2). The chain (10) is arranged at (23), and the pinning bolt (5a) and the chain fixing bolt (9) are screwed into the through hole (212). At this time, the pin holding bolt (6) is removed.

In the set state of FIG. 12, the chain (10) is pressed against the inner surface of the main body so as not to move by strongly tightening the chain fixing bolt (9). In this state, the pin (11) of the chain is in a state of entering the recess (216) of the main body.
At this time, the tip portion of the pin removal bolt (5a) is in contact with the pin (11) of the chain.

Next, the pin (11) begins to come out of the joint (12) by tightening the pin removal bolt (5a) (see FIG. 13).
When the pin (11) has been partially removed, the pin-unscrewing bolt (5a) is replaced with a pin-unscrewing bolt (5b) having a longer non-threaded portion and tightened, as shown in FIG. 11) is completely removed.
When the pin (11) is extracted, the chain (10) is cut at that portion, and the cutting operation is completed.

Next, before the chain is connected using the motorcycle chain changer (1), the old chain is replaced with the new chain.
At the same point where the old chain was cut, the old chain and the new chain can be temporarily connected using a joint, and the old chain can be pulled to make a single turn to replace the new chain.

Subsequently, the new chain replaced with the old chain is temporarily connected again with the joint, and the next connection work is started.
Hereinafter, a chain connecting method using the motorcycle chain changer (1) according to the present invention will be described with reference to FIGS.
The new chain is temporarily connected to the rear gear portion by the joint, and the changer body (2) is set to the joint portion as shown in FIG.
In the state of FIG. 15, two press-fitting guide pins (4) are inserted into the other U-shaped portion (24) of the exchange tool main body (2), and the inner guide for press-fitting is inserted into these press-fitting guide pins (4). (3) Set the press-fitted plate (13) and O-ring (14) inserted.
And it tightens until the front-end | tip of a press-fit guide pin (4) contacts the hollow (15) of the pin front-end | tip of a chain joint.

Next, after passing the required number of washers (16) through the shaft portion of the pin press-fit bolt (7), the pin press-fit bolt (7) is inserted into the screw hole (214) between the press-fit guide pins (4). Screw together.
At this time, the washer (16) is interposed between the head of the pin press-fitting bolt (7) and the other vertical plate (21d) of the other U-shaped part (see FIG. 15). ).
The number of washers (16) to be interposed may be changed according to the type of chain, and the press-fitting plate (13) is tightened until the back of the head of the pin press-fitting bolt (7) contacts the main body (2). ) Set so that press-fitting is just completed.

  From the state shown in FIG. 15, the pin press-fitting bolt (7) is tightened, and the press-fitting plate (13) is pressed against the surface of the adjacent joint (12) by the press-fitting inner guide (3). By pressing until it comes into contact, the press-fitting plate (13) is press-fitted into the pin (11) (see FIG. 16).

  When the chain joint is a clip joint, the pin press-fitting bolt (7) is retracted, the chain (10) is removed from the changer body (2), and the clip (17) is connected to the connecting portion as shown in FIG. Install according to the rotation direction of the chain.

If the chain joint is a caulking joint, then the caulking operation is started.
Before caulking, loosen the pin press-fitting bolt (7) slightly and remove the chain (10) from the other U-shaped part (24) of the changer body (2), and remove the pin retainer bolt (6) into the screw hole. Tighten to (211).
Next, as shown in FIG. 18, the chain (10) is set in one U-shaped portion (23) of the exchange body (2), and from this state, the two pin caulking bolts (8) are attached to the sphere at the tip. By alternately tightening until the pin slightly enters the recessed portion of the pin, the head of the pin (11) is caulked to fix the press-fitting plate (13) so as not to come out of the pin (11).
Finally, by aligning the notch provided on the caulking gauge with the head of the pin that has been caulked, check whether the caulking part has expanded sufficiently so that the press-fit plate is secured so that it does not come off the pin. Exit.

FIG. 19 is an external view showing a use state of the motorcycle chain changer (1) according to the present invention.
When the chain is changed using the motorcycle chain changer (1) according to the present invention, as shown in the figure, the changer body (2) is put on the chain (10) of the rear gear (18) of the vehicle. The chain can be exchanged in a fixed state.
Therefore, it is possible to perform the work reliably and easily in a stable state without performing an exchange work in an unstable state in which the chain swings and fluctuates like a conventional exchange work using a chain changer. Is possible.

  In the motorcycle chain changer (1) according to the present invention, as shown in FIG. 20, in the screw hole (221) provided in the approximate center of the horizontal plate (22) of the changer body (2), When the rod-like handle (20) having the threaded portion (201) that can be screwed into the screw hole (221) is screwed, it is possible to work with the rod-like handle (20). Excellent in properties. The rod-like handle (20) can be screwed from either side of the horizontal plate (22).

  The present invention is used as a tool for exchanging motorcycle chains.

It is a left perspective view showing the exchange main part of the chain changer for motorcycles concerning the present invention. It is a right perspective view showing the exchange main part of the chain changer for motorcycles concerning the present invention. It is a perspective view which shows the inner guide for press fit of the chain changer for motorcycles concerning this invention. It is a cross-sectional view showing an inner guide for press-fitting of a motorcycle chain changer according to the present invention. It is a perspective view which shows the guide pin for press fit of the chain changer for motorcycles concerning this invention. It is a side view which shows the bolt for pin removal of the chain changer for motorcycles concerning this invention. It is a side view which shows the pin retainer bolt of the chain changer for motorcycles concerning this invention. It is a side view showing a bolt for pin press-fitting of a motorcycle chain changer according to the present invention. It is a side view which shows the bolt for pin crimping of the chain changer for motorcycles concerning this invention. It is a side view which shows the bolt for chain fixing of the chain changer for motorcycles concerning this invention. It is a top view which shows the washer of the chain changer for motorcycles concerning this invention. It is explanatory drawing of the chain cutting method using the chain changer for motorcycles concerning this invention. It is explanatory drawing of the chain cutting method using the chain changer for motorcycles concerning this invention. It is explanatory drawing of the chain cutting method using the chain changer for motorcycles concerning this invention. It is explanatory drawing of the chain connection method using the chain changer for motorcycles concerning this invention. It is explanatory drawing of the chain connection method using the chain changer for motorcycles concerning this invention. It is explanatory drawing of the chain connection method using the chain switch for motorcycles concerning this invention. It is explanatory drawing of the chain connection (caulking) method using the chain changer for motorcycles concerning this invention. It is an external view which shows the use condition of the chain changer for motorcycles concerning this invention. It is a figure which shows the attachment method of the rod-shaped handle to the exchanger main body of the chain changer for motorcycles concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chain changer 2 for motorcycles Exchanger main body 21 Vertical plate part 22 Horizontal plate part 23 One U-shaped part 24 Other U-shaped part 21a One vertical plate part 21b One U-shaped part Another vertical plate portion 21c of the U-shaped portion One vertical plate portion 21d of the other U-shaped portion Other vertical plate portion 211 of the other U-shaped portion Screw hole 212 Screw hole 213 Recessed portion 214 Screw hole 215 Screw hole ( Insertion hole)
216 Recessed portion 221 Screw hole 3 Press-fit inner guide 31 Through hole 32 Recessed portion 4 Press-fit guide pin 5 Pin removal bolt 51 Non-threaded portion 6 Pin presser bolt 62 Non-threaded portion 7 Pin press-fit bolt 71 Sphere 8 Pin caulking Bolt 81 Sphere 9 Chain fixing bolt 10 Chain 11 Pin

Claims (5)

Front H-shaped changer body composed of two vertical plate portions facing each other and a horizontal plate portion connecting the two vertical plate portions, a pinning bolt, a pin presser bolt, and a chain fixing A chain changer for a motorcycle comprising a bolt, a pin caulking bolt, a pin press-fitting bolt, a press-fitting inner guide, and a press-fitting guide pin,
Of the two U-shaped portions opposite to each other formed by the horizontal plate portion and the two vertical plate portions of the exchanger body, one U-shaped portion is a chain cutting portion and a caulking portion, and the other The letter-shaped part is the chain connection part,
One vertical plate portion of the one U-shaped portion is provided with a screw hole and a hollow portion that can be screwed with the pin holding bolt at a position facing the two screw holes, and the other vertical plate portion. Are provided with two screw holes that can be screwed together with the pin pulling bolt and the pin caulking bolt according to the pin interval of the chain,
One vertical plate portion of the other U-shaped portion is provided with two hollow portions on the surface facing the other vertical plate portion in accordance with the pin interval of the chain, and the other vertical plate portion has the 2 An insertion hole through which the press-fitting bolt and the press-fitting guide pin can be inserted is provided at a position facing the two depressions,
The pinning bolt has a shaft portion whose length is longer than the thickness of one vertical plate portion of the one U-shaped portion and a non-threaded portion having an outer diameter equal to or less than the pin diameter of the chain at the tip. And comprises two bolts with different lengths of the non-threaded portion,
The pin presser bolt is composed of one bolt whose length of the shaft part is substantially equal to the thickness of one vertical plate part of the one U-shaped part,
The chain fixing bolt is composed of a single bolt whose shaft portion is shorter than the shaft portion of the pinning bolt and longer than the thickness of the other vertical plate portion of the one U-shaped portion,
The pin caulking bolt is composed of two bolts whose shaft portion is longer than the thickness of the other vertical plate portion of the one U-shaped portion,
The pin press-fitting bolt is longer than the thickness of the other vertical plate portion of the other U-shaped portion, and consists of one bolt that can be screwed into the insertion hole,
The press-fitting inner guide is composed of a flat plate-like member provided with two through holes according to the pin interval of the chain.
The press-fitting guide pin has two guide pins that are longer than the thickness of the other vertical plate portion of the other U-shaped portion and have a tip portion having a smaller diameter than the through hole of the press-fitting inner guide. Chain changer for motorcycles.   The motorcycle chain changer according to claim 1, wherein the front end surface of the chain fixing bolt is a curved concave surface that can be brought into close contact with a pin head of the chain.   It is interposed between the head portion of the pin press-fitting bolt and the other vertical plate portion of the other U-shaped portion, and the shaft portion of the pin press-fit bolt projects from the inner surface of the other vertical plate portion. The motorcycle chain changer according to claim 1 or 2, further comprising a washer for regulating the length.   4. The motorcycle according to claim 1, wherein the press-fitting guide pin includes two independent guide pins each having a screw portion that can be screwed into the insertion hole on a base end side. 5. Chain changer. A recess is provided between the two through-holes of the inner guide for press-fitting, and a sphere that is in contact with the recess is embedded at the tip of the pin press-fitting bolt, and the hardness of the sphere is the same as that of the bolt. The motorcycle chain changer according to any one of claims 1 to 4, wherein the chain changer is for motorcycles.

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