JPS633578Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is an improvement to the layout of the oil inlet and overflow pipe in a motorcycle using a dry sump type internal combustion engine that uses a part of the body frame pipe as an oil tank.

The present applicant previously proposed a dry sump type internal combustion engine in which a part of the vehicle frame pipe, that is, the down pipe, is made up of a square pipe that is thicker than other pipes, and the inside of the down pipe is used as an oil tank. We proposed a body frame for a motorcycle that uses an engine.

By the way, the body of a motorcycle using such a dry sump internal combustion engine is equipped with a side stand.
When the side stand is upright and the vehicle is parked with the vehicle tilted to either the left or right, the tank side of the overflow pipe is attached to the vehicle body frame pipe that makes up the oil tank and returns the oil that overflows from the tank into the cylinder head of the internal combustion engine. If the opening of the oil inlet is located above the level of the oil inlet attached to the vehicle body frame, if the oil inlet cap is opened when the oil is almost full, oil will leak from the inlet. .

Therefore, it is best to layout the overflow pipe in advance so that the opening of the overflow pipe is below the level of the oil inlet when the motorcycle is parked on the side stand. If the engine is not positioned as high as possible, the amount of oil sent from the overflow pipe into the cylinder head will increase, reducing the amount of oil that is cooled by the body frame pipes that make up the tank and efficiently lubricates the internal combustion engine again. As a result, the so-called refreshed oil cannot be fully utilized.

The present invention was developed to solve the conflicting problems mentioned above all at once.The purpose of this invention is to prevent oil from entering the opening of the overflow pipe on the side of the body frame pipe that constitutes the oil tank when the vehicle is parked on the side stand. Even if the oil is almost full by positioning it below the level of the inlet, it prevents oil leakage from the inlet when checking the oil level when the vehicle is parked on an approximately horizontal surface with the side stand erected and the vehicle tilted. At the same time, when the vehicle is running upright, the opening of the overflow pipe is positioned as high as possible to prevent oil from seeping into the overflow pipe, thereby allowing the oil to be cooled and refreshed by the body frame. Therefore, the oil capacity within the vehicle body frame pipe can be increased, and thereby the interior of the vehicle body frame pipe can be used more effectively as an oil tank.
Further, it is an object of the present invention to provide a motorcycle that can improve oil cooling efficiency.

In order to achieve such an object, the present invention provides a motorcycle with a side stand on either the left or right side of the body, and a side stand on the other side of the body frame pipe that constitutes the oil tank of a dry sump type internal combustion engine, where the side stand is not arranged. An oil inlet is provided, and the opening of the overflow pipe faces inside the vehicle body frame pipe, and the opening of the overflow pipe is located above the oil inlet when the vehicle is upright and on a substantially horizontal ground. The present invention is characterized in that the oil inlet is located below the level of the oil inlet when the vehicle body is tilted when the vehicle is parked on the side stand.

A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a side view of the motorcycle, FIG. 2 is a side view of its body frame, and FIG. 3 is a front view of the oil tank.

A head pipe is fixed to the front end of a body frame pipe 2 (hereinafter referred to as body frame) of the motorcycle 1, a steering stem (not shown) is rotatably supported within the head pipe 3, and a bar handle 4 is attached to the upper end of the steering stem. is fixed to the steering stem, and the upper parts of left and right front forks 7, 7 are fixed to the steering stem via upper and lower bridges 5, 6, and a front wheel 8 is pivotally supported between the lower ends of the front forks 7, 7. ing. On the other hand, a fuel tank 9 and a seat 10 are placed in order from the front on the body frame 2 behind the head pipe 3, and a front cylinder 111 is placed on the body frame 2 below the fuel tank 9.
It is equipped with a horizontal V-type internal combustion engine 11 (hereinafter referred to as engine) in which a rear cylinder 112 and a rear cylinder 112 form a side V.
Further, exhaust pipes 12 and 13 are connected to the front cylinder 111 and the rear cylinder 112, respectively.
Exhaust mufflers 14 and 15 are connected to the rear ends of exhaust mufflers 2 and 13, respectively. Further, the front ends of the left and right rear forks 17, 17 are pivoted between the connection parts between the left and right down pipe lowers 22, 22 and the center pipes 23, 23, which constitute the vehicle body frame 2, and between the rear ends of the rear forks 17, 17, A rear wheel 18 is pivotally supported, and a shock absorber (not shown) is installed between the rear forks 17, 17 and the vehicle body frame 2.

As shown in FIG. 3, a hollow gusset 30 having a substantially triangular shape from the front is fixed to the lower half of the head pipe 3 by welding.The upper part of the hollow gusset 30 has a substantially circular cross section, and the bottom Square connecting portions 32, 32 that open downward are formed on the left and right sides of the wall 31, respectively. The upper ends of the left and right down pipes 21, 21 made of thick square pipe material are respectively inserted and fitted into the square connecting parts 32, 32, and fixed by welding. These down pipes 21, 21 are sufficiently wider than the front forks 7, 7, and each upper end thereof has a hollow gusset 3.
0, the lower ends of which are closed, and the front ends of left and right down pipe lowers 22, 22 made of thin rectangular pipes are bolted to these lower ends, respectively. Center pipes 23, 23 are connected to the rear ends by welding, respectively.

Note that the front ends of the left and right rear stays 24, 24 are connected to the intermediate portions of the center pipes 23, 23, respectively.
23, there are seat rails 25 on the left and right, respectively.
25 are each connected by welding.

On the other hand, the front end of a box-shaped main frame 26 is further fixed by welding to the rear half of the head pipe 3, and the upper parts of the center pipes 23, 23 are fixed by welding to the left and right sides of the rear end of this box-shaped main frame 26, respectively. . An air cleaner chamber 27 is formed inside the box-like main frame 26, and the air cleaner chamber 27 and the hollow gusset 30 are defined by a rear wall 33 of the gusset 30 as a partition.

A pair of left and right members of the vehicle body frame 2 constructed as described above, except for the main frame 26, are connected by a cross member (not shown).

Furthermore, a cross pipe 41 made of square pipe material thicker than this is constructed and connected between the lower parts of the two right and left down pipes 21, 21 constituting the front part of the vehicle body frame 2, and both left and right ends of the cross pipe 41 are connected. The oil cooler 44 is communicated with the insides of the down pipes 21, 21, and is supported by being hooked and bolted between the upper down pipes 21, 21 of the cross pipe 41.

Thus, in the front part of the body frame 2, there is a hollow gusset 30 whose insides are communicated with each other, and both down pipes 2.
1 and 21 and a cross pipe 41.

And the oil inflow part 45 of the oil cooler 44
and an oil discharge part (not shown) provided in the crankcase 113 of the engine 11 are connected by a tube 47, and an oil discharge part 46 of the oil cooler 44 and an oil inlet part 34 provided in the bottom wall 31 of the hollow gusset 30 are connected by a tube 47. The oil discharge part provided in the cross pipe 41 and the engine 1 are connected by a tube 48.
It is connected to an oil suction (not shown) provided in the crankcase 113 of No. 1 through a tube 49 . Therefore, the engine oil that lubricates the inside of the engine 11 is first forced into the oil cooler 44 by the discharge pressure of an oil pump (not shown), and then into the hollow gusset 30 that constitutes the upstream side of the oil tank.
The hollow gusset 30, both down pipes 21, 2
1 and a cross pipe 41, the cooled and refreshed engine oil is sucked into the engine 11 by the suction pressure of an oil pump (not shown), and lubricates the inside of the engine 11 again. Become.

By the way, as described above, the side stand 19 is installed on either the left or right side of the motorcycle body of the motorcycle 1 which uses the dry sump type engine 11 which uses a part of the body frame pipe 2 as an oil tank. That is, in this embodiment, a side stand 19 is pivotably supported on a bracket 29 fixed to the rear of the down pipe lower 22 on the left side of the vehicle body, so that the side stand 19 can be erected downward and placed approximately horizontally. If the vehicle is parked on the ground, the vehicle will be tilted to the left.

Therefore, in the present invention, an oil inlet 50 is provided to protrude upward from the upper right wall 35 of the hollow gusset 30 that wraps around the upper shoulder 21a of the down pipe 21 on the side where the side stand 19 is not arranged, that is, the right side. A cap 51 with a level gauge 52 is attached to the oil inlet 50 so as to be openable and closable.

Furthermore, a pipe insertion hole (not shown) is formed in the lower part of the rear wall 33 of the hollow gusset 30, and the front part of the overflow pipe 60 is exposed into the hollow gusset 30 through the pipe insertion hole.
The front end opening 61 of the motorcycle 1 is located above the level H ₀ of the oil inlet 50 when the motorcycle 1 is in an upright state. The rear end of the overflow pipe 60 is connected to the cylinder head 111a of the front cylinder 111 of the engine 11 via a tube 69.
The oil that has entered the hollow gusset 30 is passed into the front cylinder 111, and the pipe insertion hole of the hollow gusset 30 and the overflow pipe 60 are tightly fitted to form an oil-tight state.

If the motorcycle 1 is parked with the side stand 19 erected and tilted to one side,
The front end opening 61 of the overflow pipe 60 is located below the level _H1 of the injection port 50 in this state. Therefore, the height of the front end opening 61 of the overflow pipe 60 is set depending on the inclination state of the motorcycle 1 when the motorcycle 1 is parked on the side stand 19.

Therefore, in the embodiment on the side where the side stand 19 is not arranged, the shoulder portion 21a of the right down pipe 21
An oil inlet 50 is provided in the upper right wall 35 of the hollow gusset 30 wrapped in the hollow gusset 30, and an opening 61 of the overflow pipe 60 is exposed inside the hollow gusset 30, and the opening 61 is connected to the motorcycle 1.
The level of the oil inlet 50 in the upright position of
It is arranged above H ₀ , and the opening 61
The level of the oil inlet 50 when the motorcycle 1 is parked on the side stand 19 at an inclined position.
Since it was configured to be located below H ₁ ,
Unique effects can be achieved as shown in FIGS. 4 and 5, respectively.

That is, as shown in FIG. 4, which schematically shows a front view of the motorcycle 1, the side stand 1 is placed on a substantially horizontal ground.
9, the vehicle body is tilted toward the side where the side stand 19 is arranged. The opening 61 of the overflow pipe 60 facing the oil inlet 50 is located below the level H ₁ of the oil inlet 50 . Therefore, even when the oil tank is full, with a high oil level _h1 , oil flows through the overflow pipe 60 to the cylinder head 11.
1a by sending that oil level h ₁
Since the level is maintained below the level _H1 of the oil inlet 50, oil will not leak from the oil inlet 50 even if the cap 51 is removed to check the oil amount.

Further, as shown in FIG. 5, which shows a schematic front view of the motorcycle 1 in the same way as FIG.
0 opening 61 is at the level H ₀ of the oil inlet 50
Since the opening 61 is located higher up, the opening 61 can be positioned as high as possible to prevent oil from entering the overflow pipe 60 unnecessarily, and the oil that is cooled and refreshed by the oil tank can be You can make full use of it.

Therefore, according to the present invention, the vehicle body frame pipe 2
The oil capacity in the oil tank constructed as shown in FIG.

By the way, inside the hollow gusset 30 is the bottom wall 3.
Since the oil pressure-fed from the oil inlet 34 provided at 1 flows in in the form of a fountain, the oil may directly enter the opening 61 of the overflow pipe 60 or oil adhering to the inner wall of the hollow gusset 30. dripping and entering into the opening 61,
Alternatively, there is a possibility that oil flowing along the inner wall may enter the opening 61.

Therefore, the structure of the opening 61 of the overflow pipe 60 was devised as shown in FIGS. 6 to 8.

FIG. 6 is a rear view of the hollow gusset 30 with main parts cut away when viewed from the engine 11 side, and FIG. 7 is a side cross-sectional view of the hollow gusset 30 taken longitudinally through the overflow pipe 60. , FIG. 8 is a plan view of the opening 61 portion of the overflow pipe 60.

First, as shown in FIG. 6, the hollow gusset 30 has a triangular cavity 39 formed in the center of its front face that penetrates in the front-rear direction.
surrounded by.

A pipe insertion hole 37 is formed in the rear wall 33 of the hollow gusset 30 at the lower side (left side in FIG. 6) of the cavity 39, and the middle part of the overflow pipe 60 is tightly inserted into the insertion hole 37. The front part of the overflow pipe 60 is bent into the hollow gusset 30 to stand up, and the front end faces the front wall 38 of the hollow gusset 30. left side wall 36
Place it facing the middle part of a while maintaining the clearance.

Then, a cover 62 is attached to the front end of the overflow pipe 60. The cover 62 has an upper part covered with a roof-like umbrella part 63 and has an opening 61 only on one side, and the opening 61 of the cover 62 is hollow when it is fitted and joined to the front end of the overflow pipe 60. The gusset 30 is attached with a clearance C maintained between the inner circumferential wall 36 of the left side 36a and the inner surface of the intermediate portion, and therefore the opening 61 of the cover 62 faces laterally or downwardly.

Thus, the opening 6 of the overflow pipe 60
1 and a cover 62 which has an umbrella part 63 covering the upper side and which opens only on one side, and between the opening part 61 and the inner surface of the intermediate part of the left side wall 36a of the inner circumferential wall 36 of the hollow gusset 30. A clearance C is formed between the opening 61 and the oil inlet 34 provided in the bottom wall 31 of the hollow gusset 30. Since they are arranged to face each other with the peripheral wall 36 in between, the fountain-shaped oil that is pressure-fed from the oil inflow portion 34 and flows into the gusset 30 directly flows into the opening 6.
1, and the hollow gusset 3
Oil adhering to the inner wall of 0 or oil flowing along the inner wall will not enter the opening 61.

Since oil is prevented from entering the opening 61 of the overflow pipe 60 as described above, it is possible to realize an opening structure that is extremely advantageous in terms of the forced pressure feed dry sump system.

As is clear from the above explanation, according to the present invention,
Equipped with a side stand on either the left or right side of the vehicle body,
An oil inlet is provided on the other side of the body frame pipe used as an oil tank for a dry sump type internal combustion engine, and the side where the site stand is not arranged, and an opening of the overflow pipe is exposed inside the body frame pipe. The motorcycle is provided with an opening located above the oil inlet when the vehicle is upright and below the level of the oil inlet when the vehicle is tilted when the vehicle is parked on the side stand on a substantially horizontal ground. As a result, even if the oil tank in the vehicle frame pipe is almost full, oil will not leak from the inlet when checking the oil level when the vehicle is parked on a horizontal surface with the side stand erected and the vehicle is tilted. It is possible to prevent leakage, and it is also possible to prevent wasteful oil from entering the overflow pipe during upright driving, so that the oil to be refreshed can be fully utilized, and therefore the body frame pipe This allows the interior of the vehicle frame pipe to be used more effectively as an oil tank, and improves oil cooling efficiency.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of a motorcycle, FIG. 2 is a side view of its body frame, FIG. 3 is a front view of an oil tank, and FIGS. The figures are diagrams schematically showing the front view of the motorcycle, in which Figure 4 is a diagram in a parked state, Figure 5 is a diagram in an upright running state, and Figure 6 is a partially cutaway rear view of the upper part of the oil tank. , Figure 7 is 7-7 in Figure 6.
The line sectional view, FIG. 8, is a view taken in the 8th direction of arrows in FIG. 7. In the drawing, 1 is a motorcycle, 2 is a body frame pipe, 19 is a side stand, 21, 30, and 4.
1 is an oil tank, 50 is an oil injection part, 60 is an overflow pipe, and 61 is an opening thereof.

Claims (1)

[Scope of Claim for Utility Model Registration] A motorcycle using a dry sump type internal combustion engine that uses one end of the body frame pipe as an oil tank, which is equipped with a side stand on either the left or right side of the body for parking with the body tilted, An oil inlet is provided on the other side of the body frame pipe on which the side stand is not arranged, and an opening of an overflow pipe is made to face inside the body frame pipe, and the opening of the overflow pipe is connected to the side when the vehicle is upright. Above the oil inlet,
The motorcycle is further arranged below the level of the oil inlet when the vehicle body is tilted when parked on the side stand on a substantially horizontal ground.