JPS6249448B2 - - Google Patents

Abstract

PURPOSE:To obtain a simple structure and improve fabrication performance by forming, on an oil pipe, a branched part which crosses at right angles with a case divided surface and inserting said pipe into one case and assembling the other case so that the divided surface is fitted. CONSTITUTION:An oil pump 25, the main pipe 38a of a T-shaped pipe 38 and the left side 38b of a branched-pipe part are fabricated beforehand onto a left- half body 21. A rib 38e is installed upstream on the top edge part 38f of a right branched-pipe part 38c, and a seal ring 39 is fitted beforehand onto the periphery of said top edge part 38f, and said top edge part 38f is inserted into a small diameter part 43c from the stepped part 43b of the opening part 43a of a transverse passage 43 when a right-half body 22 is joined, and the seal ring 39 is attached under pressure by the rib 38e and the shoulder part of the stepped part 43b, and thus seal is performed. Since a feeding passage leading from the oil pump 25 is formed through mutual joint of the half bodies, the accuracy and the fabrication performance can be improved with a simple construction.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an oil piping structure for an engine mounted on a motorcycle or the like.

(Prior Art) For forced refueling type engines installed in motorcycles and the like, it has been proposed to divide the crankcase into left and right, front and back, or top and bottom parts and join them together. In this type of engine with divided crankcases, each crankcase has an oil supply passage, an oil pump is provided on one side of the case, and oil is supplied from this oil pump to the oil supply passage of each case.

However, in such an engine, a dividing passage extending from the oil pump and opening to the split surface is formed in one side of the case, and an oil supply passage formed in the other side of the case is opened to the split surface, so that each case is divided. Since the distribution passage and the oil supply passage are connected by joining, high precision is required in machining these passages or the cut surfaces, and high precision is also required in the assembly of each case. In addition, in such an engine, it is possible to connect the oil pump on one side of the case and the oil supply passage on the other side of the case using a pipe installed outside the crankcase, but the connection and sealing of the pipe is essential. There are disadvantages in that the number of assembly steps increases and the number of parts such as pipes and joints increases.

On the other hand, it is thought that the above-mentioned drawbacks can be solved by reusing the structure of the lubricating device described in Japanese Utility Model Application Publication No. 54-142725. This fruit was published in 1977-142725
The lubricating device disclosed in the publication includes a gear case attached to one side of the crankcase, a gear group housed inside the gear case, an oil pump driven by engine power attached to the gear case, and an oil pump that communicates with the outlet of the oil pump. An oil passage formed in the gear case and an oil passage formed in the crankcase are communicated via an oil passage formed in the shaft for supporting the gear.

(Problems to be Solved by the Invention) However, in the above-mentioned lubricating device of Utility Model Application Publication No. 54-142725, a through hole is formed in the shaft for supporting the gear, and the through hole is used as an oil passage. In order to use the shaft, the shaft must be machined which increases manufacturing costs, and the diameter of the shaft through-hole is limited due to the strength of the shaft, making it impossible to feed sufficient oil. Another problem was that the locations to which oil could be supplied were extremely limited.

The present invention has been made in view of the above problems and drawbacks, and it is easy to process and assemble parts, has a small number of parts, and also allows sufficient oil to be delivered from the oil pump to a remote location, as well as to the gear support shaft. Can be supplied regardless of direction. The purpose is to provide an oil piping structure for engines.

(Means for Solving the Problems) The oil piping structure for an engine according to the present invention has an oil pump installed in one of the cases of an engine in which split cases are joined at a joint surface to form a crank case. In an oil piping structure in which the oil discharged from the oil pump is distributed inside the crankcase to the oil passages of each connected case, an oil passage is provided in each case to which oil is to be distributed, An oil pipe is opened such that the axis of the oil passage is perpendicular to the joint surface of the case, and an oil pipe branched in the same direction as the opening is arranged between the oil pump side discharge port and the opening of the case to be distributed. Further, an oil piping structure for an engine is provided in which a tip end of the oil pipe is inserted into the oil pump side discharge port and the opening.

(Function) According to the oil piping structure for an engine according to the present invention, the oil pipe extending from the discharge port of the oil pump branches in a direction perpendicular to the joint surface of each case, that is, in the dividing direction of each case. Each branched end is inserted into the opening of the oil passage of each case, and the oil pump and the oil passage of each case are communicated through the oil pipe. Therefore, high precision is not required for machining the joint surfaces and oil passages of each case, and there is no need for machining of shafts, etc., and the necessary parts are limited to oil pipes, seals, etc. The number of parts does not increase. The oil pipe branches in the dividing direction of each case, and the branched end can be inserted into the opening of the oil passage of each case at the same time as the cases are joined, and the assembly is easy.

On the other hand, since the oil discharged from the pump is not supplied through the oil passage formed in the shaft for supporting the gear, piping can be freely carried out to the required oil supply location, allowing for rational design.

(Example) An example of the present invention will be described below based on the accompanying drawings.

FIG. 1 shows a side view of a motorcycle 1 as an example of a vehicle equipped with an engine, in which a front fork 4 supporting a front wheel 5 via a head tube 3 to the front end of a frame 2 is operated via upper and lower bridges 6. A handle 7 is provided on the top bridge. A fuel tank 8 is provided at the upper front part of the frame 2, and a seat 9 is provided at the rear of the fuel tank 8. A rear fork 10 that supports the rear wheel 11 is pivotally extended from the lower rear part of the frame, and the rear fork 10 and the frame are connected. A reaction unit 12 is interposed between them.

An engine 13 is mounted on the lower front part of the frame, and in the embodiment, the engine 13 is a water-cooled engine with a V-shaped side and a horizontal crankshaft, and a case 20 consisting of a crank case and a transmission case.
Cylinder block 14 on top, cylinder head 1
5 and a cylinder head cover 16 are provided, and a carburetor 17 serving as a fuel supply device is disposed above between the cylinder units A and B.

The case 20 is of a left-right split type, and consists of left and right case halves 21 and 22 joined together.

Joint surface 21a of left and right case halves 21, 22,
22a has thick mounting parts 21b and 22b at opposing positions on a part of its outer surface, one 21b has a loose fitting hole 21c in the vehicle width direction, and the other 22b has a blind hole-shaped screw concentric therewith. 22c, hole 21c, hole 2
As shown in Fig. 4, the pipe 23 is press-fitted into one of the joints of 2c in advance in a half-submerged state, and when the other half is fitted, the other half of the pipe is fitted into one end of the hole. Center the case half 21,
It facilitates the alignment and assembly of the joint surfaces of the parts 22 and the connection with the bolts 24, and a plurality of such connection parts are provided.

A plurality of screw holes 21d are provided in one side 21a of the joint surface near the bottom of the case 20 in a direction perpendicular to this,
The pump 25 is provided with a drive shaft 25a extending in a direction perpendicular to the joint surfaces 21a and 22a, and the pump 25 is connected to one half body 21 through a bolt 26 in the screw hole 21d.
It is bonded to the joint surface 21a of. Bottom 2 of case 20
0a is an oil pan, an oil strainer 27 is arranged above this, and this is connected to the suction passage 25b of the pump 25, and the rotor 2 provided on the drive shaft 25a
The suction passage 25b communicates with the discharge passage 25d via 5c. In the figure, 46 indicates a relief valve. In the embodiment, a drive shaft 18a is provided coaxially with the drive shaft 25a, and the rotor 1 of the water pump 18 is attached to the outer end of the drive shaft 18a.
8b, the rotor 18 faces the water passage 18c, and the water pump system is installed insulated on the side of the half body 21 where the oil pump 25 does not face, and the water pump is driven coaxially with the oil pump drive. ing. A sprocket 28 is provided at the end of the drive shaft 25 of the oil pump 25, while a gear 30 is provided on the crankshaft 29, and a sprocket 32 driven by a gear 31 meshing with the sprocket 28 and the sprocket 2
8 through a chain 33 to drive an oil pump 25.

FIG. 4 is a cross-sectional plan view of the main part of the case 20, in which a solid part 21e is partially provided so as to face the joint surface 21a of the half body 21 on the side that connects and supports the oil pump 25, and the solid part 21e is provided in the front and back direction. An oil filter 34 is provided on one end surface. The pump 25 is provided in the solid portion 21e.
An introduction passage 35 is provided which connects to the discharge passage 25d of the filter 34, and the outlet 34a of the clean side of the filter 34 is insulated from the passage 35 and connected to a discharge passage 36 provided in the solid body 21e.
An opening 36a is formed in a part of 1a.

A joint 37 is connected to the opening 36a, and the joint 37 has an L-shaped passage 37a perpendicular to the front-rear direction of the case 20, and an opening 37b at the front-rear end thereof has a diameter larger than that of the passage 37a. Forming the first step 37c, the first step 37
A second stepped portion 37d having a smaller diameter is formed upstream of c, and the passage 37a has a slightly smaller diameter than the second stepped portion 37d. The upstream part 38d of the main pipe part 38a of the T-shaped communication pipe 38 has a main pipe part 38a long in the front-rear direction at the second step part 37d, and branch parts 38b and 38c branching left and right in the downstream part.
Insert. The upstream portion 38d is provided with a ring-shaped rib 38e that protrudes outward in the radial direction.
A seal ring 39 is interposed between the upstream end 38d and the first step portions 37c and 42.
b, 43b and oil pipe tip outer diameter 38d,
38f, and in the axial direction, that is, between the closed end of the first step and the rib 3 of the oil pipe.
No tightening allowance is given between 8e and 8e.

By the way, the length of the upstream end 38d in front of the rib 38e is set so that the seal ring 39 is inserted into the second step 37d forming a passage in front of the first step 37c with a predetermined length. However, this also applies to the ends of the left and right branch pipe parts, and the ribs of the branch pipe parts 38b and 38c and the ends of these serve the same function.
They are shown as e and 38f, respectively. and the small diameter portion 42c,
Tip part 38 of communication pipe 38 inserted into 43c
In Fig. 5, the length of f from the rib 38e is L>l, which is the length l of the large-diameter step portions 42b and 43b compared to L, and when assembling the left and right halves 21 and 22, No more prying. In this way, the three ends of the pipe 38 are fitted into the openings separate from the sealing portion, and the pipe is fitted and supported at the openings, so the sealing ring bears only the sealing action and the sealing This prevents the ring from twisting, increasing its durability.

The above pipe 38 has the main pipe 38 facing inside the right case half 22 as shown in FIG.
It is located on the right side of 1a and extends in the front-rear direction parallel to this. The left and right case halves 21 and 22 have oil passages 4 to the crankshaft journal.
The partition walls 21f, 22f are spaced apart from and parallel to the joining surfaces 21a, 21b through a part of the partition walls 21f, 22f so that the partition walls 21f, 22f are parallel to each other.
A part of 2f has transverse bulkheads 21g and 22 in the left and right direction.
g, and lateral passages 42 and 43 communicating orthogonally with the passages 40 and 41 described above are provided with openings 42a and 43a in the joint surface direction. A first step 42 is provided at the end of each opening 42a, 43a.
b, 43b are formed, one of the pipes 38, for example, the downstream end of the left branch pipe part 38b, that is, the tip part 38f is inserted into the second step part 42c of the horizontal passage 42, and a seal ring is inserted at the tip of the rib 38e. Interpose 39.

Note that in order to fit the upstream end 38d of the oil pipe 38 into the second step 37d formed in the joint 37, and to fit the branch 38f at the left end of the oil pipe 38 into the second step 42c of the horizontal passage, There is a slight gap between the outer diameter of the first step and the rib 38e of the oil pipe, and there is also a slight gap between the second step and the tips 38d and 38f of the oil pipe.

In this way, the oil pump 25 and T
The main pipe 38a of the letter-shaped pipe 38 and the left side 38b of the branch pipe portion are assembled in advance.

A rib 38e is similarly provided upstream of the tip 38f of the right branch pipe portion 38c, and a seal ring 39 is fitted in advance around the tip 38f at the tip of the rib 38e, so that when the right half body 22 is joined, the horizontal passage 43 is closed. The second step 43 of
The distal end 38f is inserted into the tip 38f, and the seal ring 39 is pressed against the first step 43b to form a seal. In this way, by forming a passage in one half and attaching one of the branch parts of the pipe to the passage so as to be perpendicular to the joining surface, by joining the other half, the other branch part can be fitted at the same time. A supply path from the oil pump 25 is formed by inserting the two halves and joining them together. A joint 44 is provided at the outer end of one of the horizontal passages 42 and connected to a pipe 45 to supply oil to other mechanisms.

Note that the piping structure according to the present invention can be applied not only when the crankcase is divided into left and right sides, but also when the crankcase is divided into upper and lower parts, and front and rear parts, and the oil pipe is limited to the T-shape shown in one embodiment. Without a doubt, F,
〓, 〓, 〓, 〓, etc., where the branched oil passage is perpendicular to the joint surface can all be applied.

(Effects of the Invention) As explained above, according to the engine oil piping structure according to the present invention, an oil passage is provided in each case to which oil is to be distributed, and the axis of the oil passage is perpendicular to the joint surface of the case. An oil pipe branched in the same direction as the opening is disposed between the oil pump side discharge port and the opening of the case to be distributed, and the tip of the oil pipe is connected to the oil pipe. Since it is fitted into the pump side discharge port and the opening, it is possible to supply sufficient oil to each case, and high precision is not required for machining the joint surfaces and oil passages of each case. The number of parts can be reduced, and furthermore, assembly is easy, and manufacturing costs can be reduced. On the other hand, since the oil discharged from the pump is not supplied through the oil passage formed in the shaft for supporting the gear, piping can be freely carried out to the required oil supply location, allowing for rational design.

[Brief explanation of the drawing]

Fig. 1 is a side view of the motorcycle, Fig. 2 is an explanatory side view of the engine, Fig. 3 is a sectional view taken along line 3-3 in Fig. 2, and Fig. 4 is a sectional view taken along line 4-4 in Fig. 2. , FIG. 5 is an enlarged view of the main part of FIG. 4. In the drawing, 13 is an engine, 14 is a cylinder block, 20 is a case, 21 and 22 are left and right cases, 21a and 22a are split surfaces, 38 is an oil pipe, and 38b and 38c are branch pipe sections.

Claims (1)

[Claims] 1. An oil pump is disposed in one of the cases of an engine in which split cases are joined at the joint surface to form a crankcase, and the oil discharged from the oil pump is used as the oil in each of the joined cases. In an oil piping structure in which oil is distributed inside the crankcase, an oil passage is provided in each case to which oil is to be distributed, and the oil passage is opened so that the axis of the oil passage is perpendicular to the joint surface of the case. An oil pipe branching in the same direction as the opening is arranged between the pump-side discharge port and the opening of the case to be distributed, and the tip of the oil pipe is connected to the oil pump-side discharge port and the opening. An engine oil piping structure that is fitted into the engine.