JPH0447378Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a piping structure for a split case, cover, etc. of an internal combustion engine, and particularly relates to a piping structure for a split case of a motorcycle engine.

(Prior Art) In a conventional lubricant pipe piping structure in a two-part crankcase, for example, a lubricant pipe 52 is generally welded to a joint 51 as shown in FIG. 53 and inserting the I (eye) bolt 54 into the screw hole 55 of the connecting boss to fix it to the boss.
Oil guide passage 56 provided in the crankcase wall
A pipe joint 5 of the type that connects the lubricating oil pipe 52 to
0 was used.

(Problem to be solved by the invention) However, in this type of conventional piping structure, when the lubricating oil pipe 52 is set in a predetermined direction and the bolt 54 is screwed into the screw hole 55 and fixed, the joint 51 is also damaged. Continuous rotation causes bending stress to be applied to the welded portion 57, which remains as residual stress and causes bending or loosening due to further vibration during operation.

The present invention was made in view of the problems of the prior art described above, and it is possible to eliminate mounting stress on the welded part between the conduit piped in the split case and the pipe joint, and to prevent the installation of fasteners such as bolts. It is an object of the present invention to provide a piping structure such as a split case that allows a conduit to be easily connected and prevented from coming off without using a pipe.

(Means for Solving the Problems) In order to achieve the above object, the solution means of the present invention includes pipes installed inside each of the divided cases, and pipes formed opposite to each other on the inner walls of both cases. , a boss having a boss hole that communicates with a conductive path provided in each case, and a boss that is fitted into the boss hole of the boss of each case, and the above-mentioned one that is fitted to each boss at the center of each case. A plug-in pipe joint having a communication hole communicating with each boss hole and connected so that each of the conduits communicates with each communication hole is provided. Each of the pipe joints has a head that abuts against the other pipe joint in the fitting direction when the two cases are joined together.

(Function) As a result, in the present invention, the plug-in pipe joints of the conduits installed in each case of the split case are connected to each other by the heads of the plug-in pipe joints of the conduits installed in the other case. When the two cases are joined, each pipe joint is attached and prevented from coming off by being pressed in the fitting direction.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

Fig. 1 is an inner side view of a two-part right crankcase in a motorcycle engine equipped with a piping structure in the two-part crankcase as an embodiment of the present invention, and Fig. 2 is an internal side view of the right crankcase shown in Fig. 1. FIG. 3 is an internal side view of the main parts of the left crankcase joined to the case.

As shown in FIGS. 1 and 2, the two-part crankcase of a motorcycle engine equipped with the piping structure of the present invention is approximately transversely located at the center in the longitudinal direction indicated by arrows F and B. It is divided into two equal parts. The left and right crankcases 1a, 1b have peripheral walls 10a, 10b that form a front wall 11, a bottom wall 12, a rear wall 13, and a top wall 14 when joined by joint screws (not shown) of joint bosses. are doing. That is, the peripheral walls 10a, 10b have joint surfaces 9a, 9b that are fluid-tightly joined by a liquid packing or the like. The crankcases 1a and 1b each have a mounting surface 15 on which a cylinder block (not shown) is mounted so as to form a V-shape in the front-rear direction at the top.
b, 16a, 16b, oil pans 17a, 17b for storing lubricating oil (the level is indicated by the imaginary line L) are formed in the lower interior, and a breather means 18b is formed in the front part, and in the center part in the lateral direction. Boss 19a, 1 that supports the crankshaft (not shown)
9b, a boss 20b for supporting a balancer shaft is formed protrudingly at the front lower part thereof, and bosses 21a and 21b for supporting a transmission input/output shaft are protruded from the rear part thereof.

In the piping structure of the lubricating oil pipe system disposed inside the crankcase, a suction filter 22 is provided in the recess 12c of the bottom wall 12 of the right crankcase 1b to filter the lubricating oil sucked into the inside through the opening 23c. part 23, and a lubricating oil pump 24 which is attached to the lower part of the side wall of the right crankcase 1b and sucks lubricating oil from the suction part 23 and pumps it to the discharge pipe 25. ), the pressure oil is guided to the external filter 30, and the filtered lubricating oil is passed through the main pipe section 26 to the right crankcase 1.
It is designed to lead to the lubricating oil pipe for the left crankcase 1a via a branch passage 27 from the main pipe portion 26.

Therefore, the right crankcase 1b shown in FIG.
The lubricating oil pipe in the internal space 3b is provided with a riser pipe 29b having a plug-in pipe joint 28b connected to the main pipe portion 26 integral with the rear wall 13 by fitting at the lower end, and this riser pipe 29
The main bearing lubricating oil 32b and the transmission output shaft and cylinder head lubricating oil pipes 33 are branched at the upper end of the main bearing via a branching pipe joint 31, respectively. In this case, this lubricating oil pipe 33
A plug-in pipe joint 34 is provided at the tip of the plug-in pipe joint 34, and by fitting the plug-in pipe joint 34 into a boss 35b provided on the right crankcase 1b,
A lubricating oil pipe 33 is connected to the transmission output shaft passage 36b and the cylinder head passage 36c.
are starting to communicate.

The main bearing lubricating oil pipe 32b is connected to a plug-in pipe joint 32c fitted into the oil filling hole 19c at the top of the crankshaft support boss 19b, and is connected to the main bearing 5 from the oil filling hole 19c through the through hole 19d. Furthermore, lubricating oil is supplied to the piston cooling/lubrication nozzle 7 via the main bearing 5 or the crank journal (not shown). Pipe joint 32c
is fitted into the oil filling hole 19c by a presser plate 32e fixed to the upper part of the boss 19b with a screw 32d.

On the other hand, the lubricating oil pipe for the left crankcase 1a shown in FIG. 2 is connected by fitting to the hole of the boss 40a (FIG. 3) with which the branch passage 27 communicates with the lower end of the lubricating oil pipe for the left crankcase 1a. Riser pipe 29a with similar bayonet fitting 28a
and a main bearing lubricating oil pipe 32a connected via a plug-in pipe joint 37 at the upper end of the riser pipe 29a. In this case, plug-in pipe joint 3
7 is fitted into the boss 35a of the left crankcase 1a, thereby allowing the riser pipe 29a to communicate with the transmission input shaft lubricating oil passage 36a.

The specific fitting structure of the insertion type pipe joints 28a, 28b of the left and right crankcases 1a, 1b is shown in FIG. 3. In other words, this double pipe joint 2
8a and 28b have a large diameter part and a small diameter part,
Communication holes 38a and 38b are opened at the axial center of the shaft. And riser pipe 2 for each large diameter part.
9a, 29b are connected by welding so as to communicate with the communication holes 38a, 38b, and the respective small diameter portions are connected to the bosses 40a, 40b of the left and right crankcases 1a, 1b via seal rings 39a, 39b.
The boss holes 41a, 41b are fitted into boss holes 41a, 41b formed in the communication hole 3.
8a, 38b to each riser 29
a and 29b are the main pipe section 26 (Fig. 1) and the branch passage 2
7 (Figures 1 and 2).

In this way, both pipe joints 28a and 28b are in a positional relationship in which their respective heads 42a and 42b face each other in the fitting direction in the fitted state, and by joining both crankcases 1a and 1b, both pipe joints 2
The heads 42a and 42b of 8a and 28b are in contact with each other so that the fitted state is maintained.

In addition, the plug-in type pipe joints 34 (Fig. 1) and 37 (second
The relationship shown in Fig.
, and detailed illustrations and explanations thereof will be omitted.

Note that the present invention is applicable not only to a plug-in pipe joint that connects a passage in a crankcase wall with a pipe line, but also to a plug-in pipe joint, such as the upper branching pipe joint 31, which is used to branch many pipes. It can also be applied to pipe joints with

(Effects of the invention) As described above, according to the piping structure such as the split case of the present invention, the plug-in pipe joints of the conduits installed in each case are mutually connected to the conduits installed in the other case. Since the head of the plug-in type pipe joint is pressed and held in contact with the two cases when they are joined, each pipe joint can be easily fixed without using a fixing stopper or providing a separate member. In addition, the durability of the piping structure can be improved without applying any bending stress to the conduit and its connecting welded portion during the fixing.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the piping structure of one crankcase, Fig. 2 is a side view showing a part of the piping structure of the other crankcase, and Fig. 3 is the same as Fig. 1.
A cross-sectional view showing the relationship between a pair of pipe joints along a line,
FIG. 4 is a sectional view showing a conventional pipe joint. 1a, 1b...left and right crankcases, 7...
... Piston cooling/lubrication nozzle, 17a, 17b
... Oil pan, 24 ... Lubricating oil pump, 28
a, 28b...Plug-in type pipe joint, 29a, 29b
...Rising lubricating oil pipe, 32a, 32b... Lubricating oil pipe for main bearing, 33... Lubricating oil pipe, 34... Plug-in type pipe joint, 36a, 36b...... Lubricating oil passage for transmission, 37... Plug-in type pipe joint , 40
a, 40b...boss, 42a, 42b...head.

Claims (1)

[Claims for Utility Model Registration] Conduit pipes are installed inside each of the divided cases, and boss holes are formed on the inner walls of both cases to face each other and communicate with the conduit passages provided in each case. a boss, which is fitted into the boss hole of the boss of each of the cases, and has a communication hole in its axial center that communicates with each of the boss holes when fitted to each of the bosses, and each of the conduits and a plug-in pipe joint connected to communicate with each of the communication holes, and each of the pipe joints is configured to press against the other pipe joint in the fitting direction when the two cases are joined. A piping structure such as a split case characterized by having an abutting head.