JP3406748B2 - Cover device for transmission case for motorcycle - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover device having a cover detachably attached to a transmission case for a motorcycle. 2. Description of the Related Art In a motorcycle, the power of an engine is transmitted to a rear wheel via a power transmission device so that the vehicle can travel. [0003] The power transmission device usually includes a transmission case having a lubricating oil therein. The transmission case is formed with a circular opening communicating the inside and the outside thereof, and a disk-shaped cover for closing the opening so that it can be opened and closed. Is provided.
An annular groove is formed on the outer surface of the disc-shaped cover on the axis thereof, and an O-ring is fitted into the annular groove. The space is sealed, that is, the leakage of the lubricating oil from the transmission case is prevented by the O-ring. [0004] By removing the disc-shaped cover from the opening edge of the opening of the transmission case and opening the opening,
Through this opening, it is possible to assemble the bearing into the transmission case and perform maintenance and inspection. [0005] Incidentally, since the above-mentioned disc-shaped cover is merely for closing the above-mentioned opening, there is a possibility that the appearance of the vehicle body may be deteriorated. Therefore, it is conceivable to provide a decorative cover for covering the disk-shaped cover from the outside. Also, at this time, simply providing a decorative cover increases the work of assembling the decorative cover to the transmission case,
It is conceivable that this decorative cover is integrally formed with the disc-shaped cover. However, in the case of the above construction, the decorative cover tends to be complicated in shape because it needs to improve the appearance in connection with other vehicle components. For this reason, as described above, when the decorative cover is integrally formed with the disk-shaped cover, when the disk-shaped cover is machined to form an annular groove, the decorative cover obstructs the processing operation. Therefore, there is a problem that it is difficult to form the annular groove. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a decorative cover for covering a disk-shaped cover for closing an opening of a transmission case from the outside thereof is provided to improve the appearance of a vehicle body. O in the disc-shaped cover
An object of the present invention is to make it easy to form a ring-shaped annular groove, and to make it easy to assemble a disc-shaped cover and a decorative cover with the transmission case. In order to achieve the above object, a cover device for a transmission case for a motorcycle according to the present invention includes a transmission case 14 having lubricating oil therein. A circular opening 19 for communicating the inside and the outside is formed, a disk-shaped cover 22 is provided for opening and closing the opening 19, and an annular groove 27 is formed on the outer surface of the disk-shaped cover 22 on its axis 20. An O-ring 28 is fitted into the annular groove 27, and the O-ring 28
When the gap between the opening edge 21 of the opening 19 and the disc-shaped cover 22 is sealed by the above, the decorative cover 30 that covers the disc-shaped cover 22 from outside thereof is replaced with the disc-shaped cover
2 is provided separately, and the disc-shaped cover 22 and the decorative cover 30 are removably fastened to the transmission case 14 together. Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 2 and 3, reference numeral 101 denotes a motorcycle as an example of a straddle-type vehicle, and an arrow Fr indicates the front in the traveling direction. The body frame 10 of the motorcycle 101
A front fork 103 is slidably supported at the front end of the front wheel 2, and a front wheel 104 and a handle 105 are supported by the front fork 103. On the other hand, a rear wheel 107 is supported at the rear end of the body frame 102. A fuel tank 108 is supported on the front side of the upper part of the vehicle body frame 102,
A sheet 109 is supported on the rear side. In FIG. 2, reference numeral 1 denotes an engine which is an internal combustion engine. The engine 1 is supported by a body frame 102 of the motorcycle 101. The engine 1 is a V-type multi-cylinder engine.
The crankcase 3 includes a front cylinder 4 protruding forward and upward from the crankcase 3, and a rear cylinder 5 protruding rearward and upward from the crankcase 3. Vaporizers 8, 8 are disposed in front and rear in a substantially V-shaped space 7 sandwiched between the front cylinder 4 and the rear cylinder 5. Is connected to the intake port formed at the bottom. Also,
An air cleaner 11 is connected to the upstream end of each of the vaporizers 8. When the engine 1 is driven, external air is sucked into each of the carburetors 8, 8 through the air cleaner 11, where the fuel is mixed to form an air-fuel mixture.
This is supplied to each of the front cylinder 4 and the rear cylinder 5 to be used for combustion. A power transmission device 9 for transmitting the power of the engine 1 generated by the combustion to the rear wheel 107 and a power transmission shaft 12
Are provided. The power transmission device 9 includes a reduction gear set, various bearings, and a transmission case 14 made of cast aluminum having lubricating oil therein. The rear wheel is connected to an output gear of the gears via the power transmission shaft 12. Are linked together. In all figures, the transmission case 14
A circular opening 19 is formed in the side wall 18 to communicate the inside and outside thereof, and the axis 20 of the opening 19 extends in the vehicle width direction (almost horizontal direction). The opening edge 21 of the opening 19 has an inner peripheral surface 21a and an outer end surface 21b. A disk-shaped cover 22 made of aluminum casting is provided on the shaft center 20 to open and close the opening 19 freely. The disc-shaped cover 22 includes a disc-shaped cover main body 23, a cylindrical fitting portion 24 integrally projecting from the cover main body 23, and removably fitted into the inner peripheral surface 21 a. It comprises an outward flange 25 integrally projecting from the cover main body 23 and abutting on the end face 21b. On the shaft center 20, the disc-shaped cover 22
An annular groove 27 having a U-shaped cross section is formed on the outer peripheral surface of the fitting portion 24 which is the outer surface of. The annular groove 27 is formed by machining. An O-ring 28, which is an elastic rubber sealing material, is removably fitted in the annular groove 27. The O-ring 28 is connected to the opening edge 21 of the opening 19.
Of the disk-shaped cover 22 and the outer peripheral surface of the fitting portion 24 of the disk-shaped cover 22 in a compressed manner, whereby the space between the opening edge 21 and the disk-shaped cover 22 is sealed. Thus, leakage of the lubricating oil from inside the transmission case 14 is prevented. When the disk-shaped cover 22 is removed from the opening edge 21 of the opening 19 of the transmission case 14 and the opening 19 is opened, the mounting of the bearing into the transmission case 14 and the maintenance and inspection through the opening 19 are performed. Is available. An aluminum cast decorative cover 30 for covering the disc-shaped cover 22 and the side wall 18 near the disc-shaped cover 22 from the outside thereof is provided separately from the disc-shaped cover 22. ing. The decorative cover 30 is composed of a cover body 31 and a rib 32 integrally formed on the back surface of the cover body 31 on the side wall 18 side, and has sufficient strength and rigidity. The disk-shaped cover 22 and the decorative cover 30 are detachably fastened to the side wall 18 of the transmission case 14 by fastening means 34. The fastening means 34 includes a pair of fastening pieces 35, 35 integrally projecting from the outward flange 25, a cover body 31 of the decorative cover 30, and insertion holes 36, formed in the fastening piece 35.
37, a screw hole 38 formed in the end face 21b of the opening edge 21 of the opening 19, and a bolt 39 that is inserted through the insertion holes 36 and 37 and is removably screwed into the screw hole 38.
It is composed of In FIGS. 4 and 6, the relative rotation of the decorative cover 30 and the machining blade about the axis 20 causes
By this processing blade, an annular fastening surface 31a is cut and formed on the inner surface of the cover main body 31. For convenience of explanation,
The fastening surface 31a is shown in a satin pattern in FIG. In the state of fastening by the fastening means 34, the fastening surface 31a is pressed against the outwardly facing flange 25 of the disk-shaped cover 22 and the fastening surfaces of the fastening pieces 35 facing the fastening surface 31a. In the above case, the decorative cover 30 has a limited size. Therefore, the processing blade that rotates about the axis 20 and the rib 32 that is a part of the decorative cover 30
In order not to interfere with each other, the size (diameter) of the rotation locus 40 of the processing blade is limited. Due to the above limitation, in the example of FIG. 4 viewed from the line of sight along the axis 20, the outermost edge of the rotation locus 40 is:
It crosses the insertion hole 36 (and the bolt 39). For this reason, in the inner surface of the cover main body 31 around the insertion hole 36, a portion located radially outward from the rotation locus 40 is hardly cut by the processing blade. Therefore, of the inner surface of the cover body 31 around the insertion hole 36, a portion near the outermost edge of the rotation locus 40 and a portion outside the outermost edge of the rotation locus 40. Is a step surface 31b which is further away from the fastening piece 35 of the disc-shaped cover 22 than the fastening surface 31a. In this manner, only the fastening surface 31a cut by the working blade is brought into accurate surface contact with the outward flange 25 and the fastening piece 35 of the disc-shaped cover 22, and
The fastening of the disc-shaped cover 22 and the decorative cover 30 by the above-mentioned fastening means 34 is performed accurately without looseness. With the above configuration, the stepped surface 3 of the inner surface of the cover main body 31 around the insertion hole 36 is formed.
1b does not press against the outward flange 25 or the fastening piece 35 of the disc-shaped cover 22, but the fastening force by the fastening means 34 is sufficiently ensured. The cover 30 and the cover 30 are firmly fastened to each other. In all figures, another cover 41 made of aluminum casting is provided to cover the power transmission shaft 12 from the outside. The front edge of the other cover 41 is superimposed on the rear edge of the decorative cover 30 from the outside, and the front surface 42 of the decorative cover 30 in the front-rear direction is halfway.
Is a surface 43 of the other cover 41 in the middle part in the front-rear direction.
The decorative cover 30 is formed so as to be substantially flush with
As a result, the decorative cover 30 and the other cover 41 can be seen integrally on the external appearance, thereby improving the appearance of the vehicle body. As described above, by providing the decorative cover 30 for covering the disk-shaped cover 22 from the outside, the disk-shaped cover 22 is prevented from being easily seen in appearance, and the appearance of the vehicle body is improved. Has been improved. Further, since the decorative cover 30 is provided separately from the disc-shaped cover 22, the decorative cover 30 can be formed without being affected by the shape of the disc-shaped cover 22 and the like. Accordingly, as described above, the decorative cover 30 has a desired shape associated with another vehicle component such as another cover 41. When machining the disk-shaped cover 22 to form the annular groove 27, the decorative cover 30 is separated from the disk-shaped cover 22, and the above-described processing is performed. Therefore, even if the shape of the decorative cover 30 is sufficiently deep in the direction along the axis 20 of the opening 19 with respect to the position of the annular groove 27, machining of the annular groove 27 can be easily performed. As described above, the disc-shaped cover 22
And the decorative cover 30 are removably fastened together to the transmission case 14, so that when the disc-shaped cover 22 and the decorative cover 30 are assembled to the transmission case 14, or when the transmission cover 14 is removed from the transmission case 14,
The disc-shaped cover 22 and the decorative cover 30 can be left as one body, and thus, assembling and
It is said that the removal work can be easily performed. According to the present invention, there is provided a transmission case having a lubricating oil therein, a circular opening for communicating the inside and the outside of the transmission case, and a disk for closing the opening so that it can be opened and closed. An annular groove is formed on the outer surface of the disk-shaped cover on the axis thereof, and an O-ring is fitted into the annular groove. The O-ring is used to form the opening edge of the opening and the disk-shaped cover. In a cover device for a transmission case for a motorcycle in which a gap is sealed, a decorative cover for covering the disc-shaped cover from outside thereof is provided. For this reason, the disc-shaped cover is merely for closing the opening, and may reduce the appearance of the vehicle body. However, the disc-shaped cover is covered with the decorative cover as described above and has an external appearance. It is prevented from being visible above. Therefore, the appearance of the vehicle body is improved by the decorative cover. Also, since the decorative cover is provided separately from the disc-shaped cover, first, the decorative cover can be formed without being affected by the shape of the disc-shaped cover. Accordingly, since the degree of freedom of forming the decorative cover is improved, the decorative cover can be formed into a desired shape related to other vehicle components such as other covers, and the appearance of the vehicle body is correspondingly improved. Can be further improved. Secondly, when forming the annular groove by machining the disc-shaped cover, the decorative cover can be separated from the disc-shaped cover. Therefore, no matter how complicated the decorative cover is, the decorative cover is prevented from interfering with the work of processing the disc-shaped cover.
The formation of the annular groove in the disc-shaped cover can be easily performed. Further, according to the invention, the disc-shaped cover and the decorative cover are jointly detachably fastened to the transmission case. Therefore, when assembling the disc-shaped cover and the decorative cover to the transmission case, these can be assembled integrally. Therefore, assembling can be easily performed as compared with the case where the disc-shaped cover and the decorative cover are separately assembled.

[Brief description of the drawings] FIG. 1 is a sectional view taken along line 1-1 of FIG. FIG. 2 is an overall side view. FIG. 3 is a partially enlarged view of FIG. 2; FIG. 4 is a rear view of the decorative cover. FIG. 5 is a sectional view taken along line 5-5 in FIG. 3; FIG. 6 is a sectional view taken along line 6-6 of FIG. 3; FIG. 7 is a sectional view taken along line 7-7 of FIG. 6; [Explanation of symbols] 101 motorcycle 1 Engine 9 Power transmission device 14 Mission case 19 opening 20 axis center 21 Opening edge 22 Disc-shaped cover 27 annular groove 28 O-ring 30 Makeup cover 34 fastening means

Continuation of the front page (56) References JP-A-55-156777 (JP, A) JP-A-3-200491 (JP, A) JP-A-6-48346 (JP, A) JP-A-61-257385 (JP, A) , A) JP-A-62-26176 (JP, A) JP-A-63-130491 (JP, A) Full-open sho-56-166358 (JP, U) Real-open 1983-178090 (JP, U) 5-32275 (JP, U) Japanese Utility Model 1981-15151 (JP, U) Japanese Utility Model Application 2-39982 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) F16H 57/00 -57/12 B62J 13/00 B62J 23/00 B62K 19/44 B62M 11/00-11/18

Claims (1)

(1) A disc provided with a transmission case having a lubricating oil therein, a circular opening formed in the transmission case to allow communication between the inside and the outside thereof, and the opening being openably and closably closed. An annular groove is formed on the outer surface of the disk-shaped cover on the axis thereof, and an O-ring is fitted into the annular groove. The O-ring is used to form the opening edge of the opening and the disk-shaped cover. A cover device for a motorcycle transmission case in which a gap is sealed between the disc-shaped cover and the disc-shaped cover. The disc-shaped cover is provided separately from the disc-shaped cover. A transmission device for a motorcycle transmission case, which is detachably fastened to the transmission case.