KR100221637B1 - Chain case for motorcycle - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a practical resin resin full cover type chain case, wherein any of the full cover type chain case 3 is made of a resin upper case 4 and a lower case ( 5) up and down is divided into two. Then, the upper and lower coalescing portions are inserted into the middle portion plate insertion portions 34 and 44 for inserting the intermediate portion insertion plate 23 provided on the arm pipe 3a of the rear swing arm 2 to the outer wall of the intermediate portion. ), And an engaging portion consisting of an engaging hole and an engaging click 45 is installed on the inner wall. Then, the rear portion is floated to the screw holes 25 and 26 of the end piece 17 by the attachment bolt 63 with respect to the long holes 36 and 46 via the ring rubber 62. floating).

Description

Chain case

The present invention relates to a chain case of an automatic two-wheeled vehicle.

A chain case for covering a chain of a two-wheeled vehicle is known. As an example, Japanese Patent Publication No. 6-6438 shows a chain case made of aluminum divided into two in the vehicle width direction. The chain case is in the form of a full cover that covers the entire chain. Furthermore, a half cover type that covers the upper half side of the chain is also known. In this case, it is also known that the chain case is formed of resin.

By the way, when the chain case is made of metal, as the component parts increase, the manufacturing process also increases by pressing, welding, and painting. In addition, it is made of a relatively heavy material and there is a limitation in the mounting configuration, and if the chain is excessively extended, it is impossible to absorb the contact noise generated by contacting the inside of the chain case.

On the other hand, if the chain case is made of resin, many of these problems can be solved. However, it is impossible to obtain a practical full cover type for the following reasons.

① In case of large division of drift due to molding error or thermal expansion and divided structure, coalescing becomes difficult.

(2) Since the rear swing arm to be mounted is made of metal, there is a possibility that pressure may concentrate on the mounting part due to the difference in thermal expansion rate.

③ It becomes weak due to excessively extended chain interference.

Accordingly, the present invention is to solve the above problems, even if the chain case is divided into two top and bottom resin full cover (full cover) form to regulate the movement of the upper and lower direction in the middle of the union of the upper case and the lower case It is an object of the present invention to provide a chain case of an automatic two-wheeled wheel which facilitates the up and down coalescing even if a dimensional difference caused by a molding error or thermal expansion is increased to some extent by providing an engaging portion.

The present invention for achieving the above object is a chain case which is supported by a rear swing arm supported by the vehicle body so as to be swingable, and covers the chains arranged in the front and rear directions above and below the rear swing arm, the upper case and the lower case. It is divided up and down and merged from the top and bottom to form a full cover that can cover almost the entire chain. Both of the upper case and the lower case are formed of a resin, and the upper and lower cases are formed in the middle of the coalescing part of the upper case and the lower case. It is characterized in that the engaging portion for regulating the movement is provided.

In this case, in the rear swing arm of the upper case or the lower case rear side, at least one mounting portion may be a floating structure, or the outer wall of each middle portion of the upper case and the lower case may be inserted into the up and down protruding members provided on the rear swing arm. It can be fixed.

In addition, a reinforcing member may be installed in a lower portion of the inner side of the chain line of the lower case, and in this case, the reinforcing member may be formed of metal or an elastic body.

In addition, a confirmation window for checking the elongation of the chain can be provided on one side.

1 is a perspective view showing the mounting state of the chain case to the rear swing arm (rear swing arm) according to the present invention.

2 is a side view of the front end portion when the vehicle body is mounted;

3 is a view showing the side shape and the bottom shape of the upper case.

Figure 4 is a view showing the side shape and planar shape of the lower case.

5 is a cross-sectional view of the state of use of the portion corresponding to the line A-A shown in FIG.

6 is a cross-sectional view of the state of use of the portion corresponding to the line B-B shown in FIG.

7 is a cross-sectional view of the state of use of the portion corresponding to the C-C line shown in FIG.

8 is a cross-sectional view of the state of use of the portion corresponding to the D-D line shown in FIG.

9 is a cross-sectional view of the state of use of the portion corresponding to the E-E line shown in FIG.

10 is a view showing a modification of the mounting portion.

11 is a view showing a modification of the reinforcing member.

* Explanation of symbols for main parts of the drawings

2: rear swing arm 3: chain case

4: upper case 5: lower case

13a: arm pipe 17: end piece

20: plate for inserting shear part 23: plate for inserting middle part

35: engagement hole 36: long hole

45: engaging protrusion 46: longevity

62: ring rubber 63: mounting bolt

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing the mounting state of the chain case to the rear swing arm (rear swing arm) according to the invention, Figure 2 is a side view of the front end when the vehicle body is mounted, Figure 3 is a side shape and bottom shape of the upper case 4 is a view showing a side shape and a planar shape of the lower case.

5 is a cross-sectional view of the use state of a portion corresponding to the AA line shown in FIG. 1, FIG. 6 is a cross-sectional view of the use state of a portion corresponding to the BB line shown in FIG. 1, and FIG. Fig. 8 is a cross-sectional view of the use state of the portion corresponding to the CC line, and Fig. 8 is a cross-sectional view of the use state of the portion corresponding to the DD line shown in Fig. 1.

9 is a cross-sectional view of a state in which a portion corresponding to the E-E line shown in FIG. 1 is used, FIG. 10 is a view showing a modification of the mounting portion, and FIG. 11 is a view showing a modification of the reinforcing member.

As shown in Fig. 2, the front end portion of the rear swing arm 2 is pivotably supported by a pivot frame 1 arranged in the vertical direction. The rear swing arm 2 is equipped with a chain case 3 so as to be rocked integrally.

The chain case 3 is made of a suitable resin such as polypropylene, and is divided into two upper and lower cases by an upper case 4 and a lower case 5. The front end of the chain case 3 extends in the vicinity of a drive sprocket 7 provided in the transmission 6 of the engine and is covered by the sprocket cover 8.

A chain 10 is wound between the drive sprocket 7 and a driven sprocket 9 supported at the rear end of the rear swing arm 2. The chain 10 runs through the top and bottom of the rear swing arm 2 and forms an upper chain line 11 and a lower chain line 12.

As shown in Fig. 1, the rear swing arm 2 has a pair of left and right arm pipes 13a and 13b, each of which is connected by a cross member 14 at the front end and at each front end. Bearings 15 and 16 are mounted, and end pieces 17 and 18 are mounted at their rear ends.

Each end piece (17, 18) is formed with a long hole (19) for supporting the axle of the rear wheel. The left arm pipe 13a extends between the upper and lower chain lines 11 and 12 of the chain 10 in the front-rear direction at side views, and the chain case 3 is attached thereto. In the vicinity of the arm pipe 13a of the cross member 14, the front end portion inserting plate 20 protrudes up and down inside the chain case 3 (the same as the body center side, below), and the outer chain In the downward portion of 10, a chain slider 21 made of resin or the like is mounted.

Further, a mounting stay 22 is provided in which the upper and lower left ends of the cross member 14 extend from the front end insert plate 20 onto the arm pipe 13a, and further bend upward and downward to protrude upward and downward. have. The opening hole 22a is provided in the front-end | tip of each mounting stay 22 of the upper and lower sides, and is provided in the inner surface side of the welding nut 22b machine at this hole position.

The intermediate part insertion plate 23 is mounted in the middle part of the said arm pipe 13a, and is protruded up and down. The end piece 17 has screw holes 25 and 26 formed at the tip of the stay 24 protruding upward and downward of the long hole 19, respectively.

As shown in Figs. 1 and 3, the upper case 4 forms an approximately "c" magnetic cross section, which is opened downward, and the fitting portion 30 (protrusion section) protrudes in the forward direction at the tip, The protruding expansion piece 31 protrudes downward from the lower end of the inner wall in the front direction of the cross member 14. The opening hole 32 is formed in the side surface corresponding to the mounting stay 22 of the said outer wall, and the insertion plate fitting part 33 into which the insertion plate 20 is fitted is formed in the corresponding inner wall ( 5).

In addition, the outer wall of the portion corresponding to the middle portion insertion plate 23 forms an insertion groove of the middle portion insertion plate 23 between the rib 34a (rib) ribs protruding downwardly inward thereof and the inner surface of the outer wall. The intermediate part plate fitting part 34 is provided, and the engagement hole 35 is formed in the inner side wall (refer FIG. 7).

In addition, a long hole 36 is formed in the outer wall of the portion corresponding to the screw hole 26 of the end piece 17 of the rear side, and the hub insertion opening 37 for the hub 27 is formed in the inner wall corresponding thereto. Is formed, and the laterally protruding expanded portion 38 is formed on the rear end side thereof (see Fig. 8).

As shown in Fig. 1 and Fig. 4, the lower case 5 has a substantially 'c' shaped cross-section open upwards, and the fitting portion 30 and the protruding expansion piece 41 are formed at the front end portion. have. In addition, the opening hole 42 and the insertion plate fitting part 43 are formed in the position corresponding to the opening hole 32 and the insertion plate fitting part 33, respectively (refer FIG. 5).

On the outer side wall of the position corresponding to the middle portion insertion plate 23, the middle portion insertion plate fitting portion 44 similar to the upper case side is formed by the rib 44a protruding from the inner side wall. Engaging clicks 45 engaged with the fitting holes 35 are projected upward on the inner side walls of the positions corresponding to the fitting holes 35 (see Fig. 7).

And the long hole 46 is formed in the outer side wall of the position corresponding to the screw hole 25, and the hub insertion opening 47 with respect to a hub is formed in the inner side wall (refer FIG. 8). On the rear side of the hub insertion port 47, a protrusion expansion portion 48 into which the lateral protrusion expansion portion 38 is fitted is formed (see Fig. 9).

Further, a confirmation window 50 is formed on the outer wall in the middle of the opening hole 42 and the intermediate plate insertion portion 44, where the cap 51 (cap) is detachably fitted (see Fig. 6). ). The cap 51 may be formed of a transparent resin.

Moreover, the reinforcement member 53 is arrange | positioned at the inner bottom part 52 of the confirmation window 50 in the longitudinal direction at the position which becomes the downward direction of the lower chain line 12. The reinforcing member 53 is a metal plate, and the rear end is inserted into the slot 54 and fixed to the bottom portion 52 by the rivet 55.

Then, the front end forms a bent portion 56 having a substantially 'J' shape, and the portion is hooked by inserting this portion in the rotational direction of the lower chain line 12 corresponding to the slot 57, that is, from the front to the rear of the drawing. A stable mounting state can be maintained even by the interference of the lower chain line 12.

As shown in Fig. 9, when the rear end portions of the upper case 4 and the lower case 5 merge up and down, the inner lateral protrusion expansion portion 48 is fitted into the lateral protrusion expansion portion 38. The opening hole 39 formed in the rear end face of the lateral protruding expansion portion 38 is aligned with the insert nut 49 embedded in the lateral protruding expansion portion 48.

Next, the mounting side of the chain case 3 will be described. As shown in Figs. 1 and 5, at the front end side of the upper case 3 and the lower case 4, the upper and lower insertion plates 20 provided on the cross member 14 of the rear swing arm 2 are shown. Is inserted into the insertion plate fitting portions 33 and 34, and the opening holes 32 and 42 of the outer wall coincide with the opening holes 22a formed in the upper and lower mounting stays 22, respectively. It fastens with the welding nut 22b provided in the mounting stay 22 by this.

As shown in Fig. 7, the middle portion inserts the upper and lower intermediate portion insertion plates 23 into the insertion plate fitting portions 34 and 44 of the outer wall, and engages with the engagement holes 35 on the inner side. ) Will be inserted and combined.

As shown in Fig. 8, the rear portion incorporates the respective holes 36 and 46 into the screw holes 25 and 26, respectively, and attaches bolts into the respective holes 36 and 46 via the ring rubber 62. Floating support is performed by fastening the 63 to each of the screw holes 25 and 26. The ring rubber 62 is not limited to rubber, but may be various resin members having high elasticity.

Further, as shown in Figs. 1 and 9, at the rear end, the lateral protruding expansion portion 48 of the lower case is fitted into the lateral protruding expansion portion 38 of the upper case, and the opening hole 39 and the insertion nut are inserted. As the 49 coincides, the bolts 64 through these holes are fastened to the insertion nuts 49, thereby joining the lateral protrusion expansion parts 38 and 39 to each other.

Thereby, the chain 10 is removed by the sprocket cover 8 covered by the front end, and almost the whole is covered by the chain case 3, and furthermore, when the sprocket cover 8 is mounted, the chain 10 ) Will be in a full cover state where all are not exposed.

In this case, the upper case 4 and the lower case 5 insert the shear inserting plate 20 and the middle inserting plate 23, and the engaging holes 35 and the engaging clicks 45. The upper and lower sides are coalesced and engaged by the locking of the up and down direction of the fitting and the bolt locking on the fitting of the protruding expansion portion 48 which is the same as the lateral protruding expansion portion 38 of the rear end.

Therefore, the upper and lower coalescing becomes easy even in a resin product having a large dimension difference due to molding error or thermal expansion. Moreover, the shear inserting plate 20 and the middle inserting plate 23 can be prevented from thermal deformation, and in particular, the middle inserting plate 23 prevents the deformation of the central portion of the outer wall which is noticeably easy. This makes it possible to maintain a good appearance.

In addition, the attachment to the screw holes 25 and 26 is made into a floating structure by rubber mount, and furthermore, the long holes 36 and 46 are elongated in the longitudinal direction of the arm pipe 13a, so that thermal expansion occurs. Even if it is deformed in the front and rear direction it can be accommodated.

Therefore, the difference in dimensions due to thermal expansion due to the combination of the dissimilar materials of the rear swing arm 2 and the chain case 3 can be accommodated, and stress concentration to the attachment bolt 63 as a mounting portion can be avoided.

In addition, even if the chain 10 is excessively extended by installing the reinforcing member 53, the lower chain line 12 first interferes with the reinforcing member 53. If there is this interference, the reinforcing member 53 generates a contact sound to function as a sound plate, whereby excessive contact of the chain 10 can be immediately confirmed by the contact noise.

Therefore, the chain 10 can adjust the length of the chain 10 before the end of the stretching while starting the interference to a portion other than the reinforcing member 53. Moreover, since the interference friction of the chain 10 can be received by the reinforcing member 53, it is possible to prevent damage by reinforcing the chain case 3 made of resin weak to interference friction.

10 is a modification of the rubber mount. For example, in the case of the lower case 5 shaft, a rubber push 71 is inserted in the mounting hole 70 corresponding to the long hole 46, and the attachment bolt 63 is attached thereto. The bolt may be fixed to the screw hole 25 by means of a screw.

In this case, since the rubber push 71 is not separated or dropped during the assembling work, the workability is improved. In addition, at least one rubber mount is sufficient. However, you may apply to all the mounting parts including the mounting part by the attachment bolt 60 of the front side, or the rear end part by the bolt 64 on the contrary.

Fig. 11 is another proposal of the reinforcing member, in which case the reinforcing member 75 is formed by a suitable elastic body such as rubber or polyurethane foam, and the bottom portion 52 is inserted by the screw 76. The nut 77 is attached.

In this way, the function as the sound plate does not occur, but the contact noise due to the elongation of the chain 10 does not occur, so that it is possible to silence the sound. In this case, since the elongation of the lower side chain line 12 can be confirmed from the confirmation window 50, the elongation gap can be prevented by confirming correctly, and it becomes possible to omit the reinforcement member 53 by doing so.

In addition, the cap 51 is not necessarily required, and a part of the lower case 5 may be partially transparent to form a confirmation window having an internal confirmation function as a window hole.

As described above, according to the present invention, even when the chain case is divided into two parts, the resin case is formed by forming an engaging portion for regulating the movement in the vertical direction in the middle of the union of the upper case and the lower case. Even if the dimensional difference due to an error or thermal expansion becomes large to some extent, the up and down coalescing becomes easy.

In addition, if at least one of the mounting portions with the rear swing arms has a floating structure, the dimensional difference due to thermal expansion between the metal rear swing arms and the resin chain case can be accommodated, and pressure concentration on the mounting portions can be avoided. Will be.

Furthermore, when the middle outer wall of the upper case and the lower case is inserted into and fixed to the up-down protruding member provided on the rear swing arm, the appearance is not deformed even when thermally expanded.

In addition, even if the chain is excessively extended, the chain case is in contact with the reinforcing member provided in the lower case in the lower direction of the chain line, so that the chain case can be prevented from being damaged by the interference of the chain even in the resin.

Furthermore, when the reinforcing member is made of metal, it functions as a sound plate that generates contact sound when the chain is extended, and it is possible to quickly identify the case where the chain is excessively extended by the contact friction sound.

In addition, when the reinforcing member is made of an elastic body, it is possible to absorb the impact caused by the excessively extended chain interference and to prevent contact noise.

In addition, when the confirmation window is provided on the side of the chain case, it is easy to check whether the chain is excessively extended and accurately adjust, so that it is easy to prevent the interference of the chain in advance even if the reinforcing member is omitted. In addition, the use of the reinforcing member can be more surely prevent the interference.

Claims (5)

In a chain case supported by a rear swing arm supported by a vehicle body so as to be able to swing, and covering the chain arranged in the front and rear directions above and below the rear swing arm, the chain case is divided into an upper case and a lower case and merged from the upper and lower sides so that the chain is almost closed. Full cover type that can cover the whole, and the upper case and the lower case are formed by resin, and the fastening that regulates the movement of the upper and lower direction in the middle part of the union of the upper case and the lower case An upper part of the upper case or the lower case of the rear swing arm of the rear swing arm, and having a floating structure, and an outer wall of the middle part of the upper case and the lower case of the upper case protruding from the rear swing arm The chain case of an automatic two-wheeled vehicle characterized by being inserted and fixed to the member. 2. The chain case of a two-wheeled vehicle according to claim 1, wherein a reinforcing member is provided in a lower portion of the inner side of the chain line of the lower case. 3. The chain case of a two-wheeled vehicle according to claim 2, wherein the reinforcing member is made of metal. The chain case of a two-wheeled vehicle according to claim 2, wherein the reinforcing member is made of an elastic body. The chain case of an automatic two-wheeled vehicle according to claim 1, wherein a confirmation window for checking the elongation of the chain is provided on the side surface.

Images