JP3237730B2 - Engine oil pump arrangement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pump arrangement for an engine having an oil pump and a water pump.

[0002]

2. Description of the Related Art For example, a water cooling system employing a separate refueling system 2
The cycle engine includes an oil pump and a water pump, and FIG. 6 shows a motorcycle engine 120 as a conventional example of such a two-cycle engine.

By the way, if the side view is kept equal to that of the engine employing the mixed refueling system without widening the width, as shown in FIG. 6, the clutch portion on the right side (the front side in FIG. 6) of the engine 120 is used. disposing an oil pump 126 to the crank shaft near the front (not shown) than 124, or placing a water pump 125 at its lower, or by disposing <br/> water pump 125 on the contrary, its lower The configuration in which the oil pump 126 is provided has to be adopted.

[0004]

However, when the oil pump 126 and the water pump 125 are arranged as described above, the lower pump (the water pump 125 in the example shown in FIG. 6) is easily damaged. There is.

Therefore, when both the oil pump 126 and the water pump 125 are arranged above the crankshaft, the side view has a shape that expands upward, making it impossible to make the entire engine 120 compact.

Further, if the oil pump 126 and the water pump 125 are stacked coaxially and arranged above the crankshaft, there is a problem that the engine becomes wide and the engine 120 cannot be made compact.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide an oil pump that can be mounted without changing the positional relationship between a crankshaft, a clutch shaft and a water pump shaft. It is an object of the present invention to provide an engine oil pump arrangement structure capable of achieving the same side view and engine width as an engine without a pump.

[0008]

In order to achieve the above object, the present invention comprises an oil pump and a water pump, and the water pump shaft is disposed on or above a line connecting the crankshaft and the clutch shaft. In the engine, the oil pump is disposed above the water pump or / and between the clutch and the water pump, and a drive mechanism of the oil pump is provided with a first drive arranged coaxially or parallel to the clutch shaft. Shaft, a second drive shaft that intersects the first drive shaft, and a gear mechanism that converts the rotation of the first drive shaft into a substantially right angle direction and transmits the rotation to the second drive shaft. It is characterized by comprising.

Further, the present invention is characterized in that the drive mechanism of the oil pump is arranged so as to overlap a vortex chamber in the water pump in a side view.

[0010]

According to the present invention , in the drive mechanism of the oil pump, the direction of rotation of the first drive shaft is converted to a substantially right-angle direction by the gear mechanism and transmitted to the oil pump via the second drive shaft. Therefore, the degree of freedom in the arrangement of the oil pump is increased, and the oil pump is brought close to the water pump and / or above the water pump without changing the positional relationship between the crankshaft, the clutch shaft and the water pump shaft. In addition, it can be disposed between the clutch and the water pump, so that the same side view and engine width as an engine without an oil pump can be realized.

Further, since both the oil pump and the water pump are disposed on or above the line connecting the crankshaft and the clutch shaft, the possibility of damage to these is reduced.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, a schematic structure of a motorcycle 1 equipped with an engine 20 according to the present invention will be described with reference to FIG.

In FIG. 5, reference numeral 2 denotes a head pipe disposed on the front upper portion of the vehicle body. An upper portion of a front fork 3 is mounted on a steering shaft (not shown) rotatably inserted through the head pipe 2. A front wheel 4 is rotatably supported at the lower end of the front fork 3.
A steering wheel 5 is attached to the upper end of the steering shaft.

A main frame 6 extends obliquely downward from the head pipe 2 toward the rear.
From the lower front end of the main frame 6, a down tube 7
Extends downward, and an engine 20 according to the present invention is mounted in a space surrounded by the main frame 6 and the down tube 7.

The engine 20 is a water-cooled two-stroke engine employing a separate refueling system. A radiator 8 is provided in front of the engine 20, a fuel tank 9 is provided above the engine 20, and an oil tank 10 is provided obliquely above the rear part. Has been established. The carburetor 11 is provided in the intake system of the engine 20.
Is connected, and an exhaust pipe 12 extends from the exhaust system.
A silencer 13 is connected to a rear end of the exhaust pipe 12.

On the other hand, a front end of a rear arm 14 is pivotally connected to a lower end of the rear end of the main frame 6 by a pivot shaft 15 so that a rear wheel 16 rotates on the rear end of the rear arm 14. It is freely supported. The rear arm 14 is suspended from the vehicle body via a rear cushion 17.

Here, the configuration of the engine 20 will be described in detail with reference to FIGS. 1 is a side view of the engine 20 including the oil supply system, FIG. 2 is a cutaway side view of a main part of the engine 20, and FIG. 3 is a cutaway plan view of the same.

In the engine 20 shown in FIG. 1, reference numeral 21 denotes a cylinder body, reference numeral 22 denotes a crankcase, reference numeral 23 denotes a transmission case, which is located forward of the clutch portion 24 on the right side (front side in FIG. 1) of the engine 20. and are disposed a water pump 25 is above the straight line L connecting the clutch shaft center O ₁ and the crankshaft center O _2.
The water pump 25 and the clutch unit 2 are located above the water pump 25.
4, an oil pump 26 is disposed.

The oil pump 26 sucks the lubricating oil contained in the oil tank 10 through a pipe 27 and raises the pressure to a predetermined pressure. Reed valve 3 of intake pipe 31 via valve 29 and pipe 30
The oil is mixed with the air-fuel mixture formed by the carburetor 11 and the parts are lubricated by the oil. still,
The operation of the control valve 29 is controlled by the duty control control unit 33 using the engine speed and the like as parameters.
4 and is returned to the oil tank 10.

The engine 20 according to the present embodiment is provided with a decompression mechanism 35. The details of the decompression mechanism 35 are shown in FIG.
When the engine is started, the valve 36 is opened as shown in FIG.
By pulling it out downstream of the reed valve 32, the load at the time of starting is reduced and the startability is improved.
In the drawing, reference numeral 39 denotes a spark plug.

Here, the drive mechanism of the water pump 25 and the oil pump 26 will be described with reference to FIGS.

In FIG. 3, reference numeral 40 denotes a crankshaft disposed in the vehicle width direction (left-right direction in FIG. 3), and 41 denotes a water pump shaft disposed parallel to the crank 40.

A gear 42 is connected to one end (right end) of the crankshaft 40, and a bolt shaft 43 is screwed to the center of one end of the crankshaft 40. A first shaft disposed coaxially with the crankshaft 40 is provided on the head of the bolt shaft 43.
One end 44a of the first drive shaft 44 is fitted and inserted and connected to the bolt shaft 43 by a pin 45.
The other end 44b of the housing 46 of the water pump 25
It is supported rotatably. The outer periphery of the first drive shaft 44 is connected to a housing 46 via a needle bearing 47.
The screw gear 44c is formed integrally with a part of the outer periphery of the screw gear 44c.

A second drive shaft 48 is provided in the vicinity of the first drive shaft 44 in a state substantially orthogonal to the first drive shaft 44, and the second drive shaft 48 is arranged as shown in FIG. As shown,
It is set up toward the oil pump 26. The upper end 48a of the second drive shaft 48 is connected to the input shaft 26a of the oil pump 26, and the second drive shaft 4
A screw gear 48b that meshes with the screw gear 44c is formed integrally with the lower end of the screw gear 8c.

The first and second drive shafts 44,
The drive mechanism of the oil pump 26 is constituted by the screw 48 and the screw gears 44c and 48b. In this embodiment, the drive mechanism is arranged so as to overlap the vortex chamber 50 in the water pump 25 in a side view. I have. The drive mechanism of the oil pump 26 may be disposed inside the water pump housing 46 so as to overlap with the water pump housing 46 in a side view as shown in FIG.

On the other hand, a gear 49 meshing with the gear 42 is connected to an intermediate portion of the water pump shaft 41, and an end of the water pump shaft 41 facing the inside of the housing 46 (the inside of the vortex chamber 50). Is attached with an impeller 51. In FIG. 3, reference numeral 52 denotes a water seal mechanism.

Thus, during operation of the engine 20,
The rotation of the crankshaft 40 is transmitted to the water pump shaft 41 via the gears 42 and 49, and the water pump 25 is driven. That is, the water pump shaft 41
The impeller 51 attached to the end of the housing 46
The cooling water is circulated while cooling each part, and the high-temperature cooling water is cooled by the radiator (see FIG. 5) and again used for cooling each part. Is done.

The rotation of the crankshaft 40 causes the first drive shaft 44 disposed coaxially with the crankshaft 40 to rotate integrally. The rotation of the first drive shaft 44 is controlled by the screw gears 44c and 48b. The direction is changed to a substantially right angle and transmitted to the second drive shaft 48, and the rotation of the second drive shaft 48 drives the oil pump 26. The drive of the oil pump 26 causes the oil to be mixed as described above. Supplied to the mind.

As described above, according to this embodiment, the rotation of the crankshaft 40 and the first drive shaft 44 is
c, 48b, the direction is changed to a substantially right angle, and the second
To the drive shaft 48 and the oil pump 26,
The degree of freedom in the arrangement of the oil pump 26 is increased, and the crankshaft 40, the clutch shaft and the water pump shaft 41 (not shown)
Oil pump 26 without changing the positional relationship of
Can be disposed close to the water pump 25 and above the water pump 25 and between the clutch portion 24 and the water pump 25, and have a side view similar to that of an engine without an oil pump. Engine width can be realized.

[0031] Further, since that is disposed above the straight line L both water pump 25 and the oil pump 26 connects the clutch shaft center O ₁ and the crankshaft center O _2, possibly it damage is kept low .

Next, the structure of the exhaust pipe 12 will be described.

Generally, in the exhaust pipe, a tapered pipe 153 as shown in FIG. 7 may be incorporated for the purpose of improving the engine performance. However, conventionally, in addition to the tapered pipe 153, a mounting stay 154 is attached to the tapered pipe 153. attachment,
Since the attachment stay 154 has been assembled to the tapered tube 153 by the Turkey be welded to the outer cylinder (not shown), not only leads to increase in the number of parts, on weld portion increases, lack durability and reliability of the welded portion There was a problem.

Therefore, in this embodiment, as shown in FIG. 8, the tapered tube 53 is composed of two half-shaped parts 53A and 53B, and one of the parts 53A is extended vertically as it is to form a flange as a mounting stay. The portion 53A-1 was formed.

Here, the mounting structure of the tapered tube 53 will be described with reference to FIGS. 9 is a longitudinal sectional view of the exhaust pipe 12, FIG. 10 is a sectional view taken along line AA of FIG. 9, and FIG. 11 is an enlarged detailed view of a portion B of FIG.

In the figure, reference numeral 55 denotes an outer cylinder, in which an inner cylinder 5 formed of a punching metal into a cylindrical shape is provided.
6 are provided concentrically, and the inner cylinder 56 and the outer cylinder 55
Is filled with a sound absorbing material 57 made of glass wool.

The outer cylinder 55 and the inner cylinder 56 each have a two-part structure, and the tapered pipe 53 has a flange 53A-1 having a half-split flange portion of one of the inner cylinder components 56A. When the welding of the tapered tube 53 to one of the inner cylinder parts 56A is completed, the other inner cylinder part 56B is fitted to the one inner cylinder part 56A, and the respective flange parts 56A-1 are joined. , 56B-1 are welded together to join and integrate the two inner cylinder parts 56A, 56B.

Next, the sound absorbing material 57 is assembled on the outer periphery of the inner cylinder 56, and finally, the two outer cylinder parts 55A and 55B are joined together so as to cover the outer side thereof, and these flange portions 55A are assembled.
By welding -155B-1, the tapered pipe 53 is assembled, and the assembly of the exhaust pipe 12 is completed.

According to the tapered tube 53 according to the present embodiment, the mounting stay conventionally required becomes unnecessary, and
Since the number of parts is eliminated and the cost is reduced, the flange portion 53A-1 of the tapered tube 53 is welded over the entire length, so that the durability and reliability of the welded portion are improved, and further, the entire tapered tube 53 is provided. The rigidity and strength of the exhaust gas are also increased, which is advantageous against the pressure and heat of exhaust gas, engine vibration, and the like.

[0040]

As is apparent from the above description, according to the present invention, an oil pump and a water pump are provided, and the water pump shaft is arranged on or above a line connecting the crankshaft and the clutch shaft. In the engine, the oil pump is located above the water pump or /
A first drive shaft disposed coaxially or parallel to the clutch shaft, and a second drive intersecting with the first drive shaft, the drive mechanism being disposed between the clutch and the water pump. And a gear mechanism for converting the rotation of the first drive shaft into a substantially right angle direction and transmitting the rotation to the second drive shaft, so that the positional relationship between the crankshaft, the clutch shaft, and the water pump shaft is provided. The oil pump can be mounted without making any changes to the engine, and the effect of achieving the same side view and engine width as an engine without an oil pump can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view of an engine according to the present invention including a refueling system.

FIG. 2 is a cutaway side view of an essential part of the engine according to the present invention.

FIG. 3 is a cutaway plan view of an essential part of the engine according to the present invention.

FIG. 4 is a cutaway plan view of an essential part of an engine showing a modified embodiment of the present invention.

FIG. 5 is a side view of the motorcycle.

FIG. 6 is a side view of a conventional two-stroke engine for a motorcycle.

FIG. 7 is a perspective view of a conventional tapered tube.

FIG. 8 is a perspective view of a tapered tube according to the embodiment of the present invention.

FIG. 9 is a longitudinal sectional view of an exhaust pipe showing a mounting structure of a tapered pipe according to an embodiment of the present invention.

FIG. 10 is a sectional view taken along line AA of FIG. 9;

11 is an enlarged detail view of a portion B in FIG. 10;

[Explanation of symbols]

 Reference Signs List 20 water-cooled two-cycle engine (engine) 24 clutch part 25 water pump 26 oil pump 40 crankshaft 41 water pump shaft 44 first drive shaft 44c screw gear 46 water pump housing 48 second drive mechanism 48b screw gear 50 vortex chamber L crankshaft Straight line connecting the clutch shaft

Claims (2)

(57) [Claims] 1. An engine comprising an oil pump and a water pump, wherein the water pump shaft is disposed on or above a line connecting a crankshaft and a clutch shaft, wherein the oil pump is located above or below the water pump. And / or a first drive shaft disposed coaxially or parallel to the clutch shaft, the first drive shaft being disposed coaxially or in parallel with the clutch shaft.
A second drive shaft intersecting the first drive shaft and a gear mechanism for converting the rotation of the first drive shaft into a substantially right-angle direction and transmitting the rotation to the second drive shaft. Engine oil pump arrangement. 2. The engine oil pump arrangement according to claim 1, wherein the drive mechanism of the oil pump is disposed so as to overlap a vortex chamber in the water pump in a side view.