JPH1181959A - Arrangement structure of lubricating oil flow control device for two-cycle engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the flow control accuracy of the lubricating oil to be supplied to an intake pipe of an engine in a device for supplying the lubricating oil from an oil pump to an intake pipe of the engine through a lubricating oil flow control device by arranging the lubricating oil flow control device near the intake pipe. SOLUTION: A lubricating oil supplying device for supplying the lubricating oil to an engine 10 of a motorcycle has an oil pump 33 to be driven by engine, and supplies the lubricating oil in an oil tank to an intake pipe 13 through a lubricating oil flow control device 35 with the operation of the oil pump 33, and has a return pipe 36 for returning the lubricating oil from the lubricating oil flow control device 35 to the oil tank. The lubricating oil flow control device 35 is formed of a solenoid three-way valve for controlling the lubricating oil flow in response to the operating condition of the engine 10, and directly connected to the intake pipe 13. An oil inlet is connected to a discharge pipe 34, and an oil outlet is connected to the intake pipe 13, and an oil return port is connected to the return pipe 36, and the oil inlet and the oil outlet are communicated with each other by electrifying.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a layout structure of a lubricating oil flow control device for a two-stroke engine.

[0002]

2. Description of the Related Art Recently, motorcycles such as motorcycle engines have been developed.
In the cycle engine, a lubricating oil supply device that lubricates the engine by supplying lubricating oil in an oil tank to an intake pipe of the engine by an oil pump has been frequently used. An example of this type of lubricating oil supply device is disclosed in Japanese Patent Application Laid-Open No. 5-222910.
There is a technique disclosed in Japanese Patent Laid-Open Publication No. H07-15095 "lubricating oil supply device for vehicle engine".

According to this technique, according to FIG. 1 of the gazette, the engine 11 (the number cited is that described in the gazette.
same as below. ) Is a lubricating oil supply device 23 that supplies the lubricating oil 22 to the intake pipes 16a and 17a via the first and second oil amount adjusting valves 33 and 34.
Specifically, the lubricating oil supply device 23 supplies the lubricating oil 22 to the oil tank 26 → the oil supply pipe 27 → the oil pump 25 → the upstream pipes 30a, 31a → the first and second oil amount adjusting valves 33, 34 →
The air is supplied to the engine 11 through a path from the downstream pipes 30b and 31b to the intake pipes 16a and 17a. The first and second oil amount adjusting valves 33 and 34 adjust the flow rate of the lubricating oil 22 to the engine 1.
1 is a solenoid valve that is controlled so as to match the operating state of No. 1. According to FIG. 2 of the official gazette, the oil pump 25 and the first and second oil amount adjustment valves 33 and 34 are connected to the crankcase 1.
2 are mounted side by side on the right side wall.

[0004]

By the way, the first and the second
The flow rate of the lubricating oil supplied from the oil amount adjusting valves 33 and 34 to the engine 11 must be an appropriate amount that matches the operating state of the engine 11. For example, if the supply is excessive, the ignition plug 18 gets wet with the lubricating oil and the startability decreases. In order to make the flow rate of the lubricating oil appropriate, the first and second oil amount adjusting valves 33,
It is necessary to increase the control accuracy of the entire lubricating oil supply device 23 as well as the lubrication oil supply device 23 alone. Further, the first and second oil amount adjusting valves 33 and 3 are provided in an extremely narrow space such as a motorcycle.
4 so that the first and second
It is preferable that the oil amount adjusting valves 33 and 34 can be freely and easily attached.

Accordingly, the object of the present invention is to provide the following (1) to (3)
It is in. (1) To improve the accuracy of the flow rate control of the lubricating oil supplied from the lubricating oil flow control device to the intake pipe of the engine. (2) To increase the degree of freedom of arrangement of the lubricating oil flow control device. (3) To simplify the mounting structure of the lubricating oil flow control device.

[0006]

According to the first aspect of the present invention, an oil pump driven by a crankshaft supplies lubricating oil to an intake pipe of an engine via a lubricating oil flow control device. In such a two-cycle engine, the lubricating oil flow control device is disposed near the intake pipe. In order to accurately control the flow rate of the lubricating oil supplied from the lubricating oil flow control device to the intake pipe, it is better that the influence of disturbance due to the oil passage from the lubricating oil flow control device to the intake pipe is smaller. To reduce disturbance, the oil passage from the lubricating oil flow control device to the intake pipe was shortened.

According to the second aspect of the present invention, the lubricating oil flow control device is arranged right or left from the center of the vehicle body, and the oil pump is arranged left or right from the center of the vehicle body. The lubricating oil flows through a long oil passage from the oil pump to the lubricating oil flow control device, and is greatly heated by heat radiation of the engine.
At high temperatures, the viscosity of the lubricating oil decreases. In the lubricating oil flow rate control device, a low-viscosity lubricating oil can control the flow rate with higher accuracy than a high-viscosity lubricating oil.

According to the third aspect of the present invention, the lubricating oil flow control device is directly attached to the intake pipe. There is no need for mounting members such as supports.

According to a fourth aspect of the present invention, an intake chamber through which an air-fuel mixture can enter and exit is branched from the intake pipe, and a lubricating oil flow control device is attached to the intake chamber. Since the lubricating oil flow control device is mounted using the intake chamber, it is not necessary to directly mount the lubricating oil flow control device on the intake pipe.

According to the fifth aspect of the present invention, the lubricating oil flow control device is attached to the intake port of the engine together with one end of the intake pipe by bolts. In the engine intake,
Since the lubricating oil flow control device is mounted together with other members, it is not necessary to directly mount the lubricating oil flow control device on the intake pipe.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that "before", "after",
“Left”, “right”, “up”, and “down” follow the direction viewed from the driver, and Fr indicates the front side, Rr indicates the rear side, L indicates the left side, and R indicates the right side. Also, the drawings should be viewed in the direction of reference numerals.

FIG. 1 is a left side view of a motorcycle according to the present invention. The motorcycle 1 includes a cradle-type body frame 2
A front fork 4 attached to the head pipe 3 of the body frame 2, and a front wheel 5 attached to the front fork 4.
A handle 6 connected to the front fork 4, a fuel tank 7 mounted so as to straddle the front upper portion of the body frame 2, an oil tank 8 mounted on the body frame 2 at the lower left of the fuel tank 7, 2, a water-cooled two-stroke engine 10 disposed in a cradle space of the body frame 2, an air cleaner 11, a carburetor 12, and an intake pipe 13 connected in series to an intake port of the engine 10. An intake chamber 14 branched from the intake pipe 13, an exhaust pipe 15 and a silencer 16 connected to an exhaust port of the engine 10, a radiator 17 disposed in front of the engine 10, and a swing arm 18 attached to a rear portion of the body frame 2. A rear suspension 19 in which the rear end of the swing arm 18 is suspended from the body frame 2; Consisting of wheel 20. After attaching to over arm 17.

The motorcycle 1 has an occupant step 2 on both left and right sides of a crankcase 10a of an engine 10.
3 and 23 (only one on the left side is shown in this figure), and a lubricating oil supply device 30 for supplying lubricating oil to the engine 10 is disposed near the engine 10.
In the figure, 24 is a change pedal, 25 is a drive chain,
26 is a front fender, 27 is a side cowl, and 28 is a rear fender.

FIG. 2 is a system diagram showing an intake system of an engine and a lubricating oil system of a lubricating oil supply device according to the present invention. The intake system of the engine 10 includes an intake port 10b of the engine 10.
The air cleaner 11, the carburetor 12, the intake pipe 13, and the reed valve 29 are connected in this order. The intake chamber 14 is a chamber through which an air-fuel mixture passing through the intake pipe 13 can enter and exit.
Using the internal pressure fluctuation, it plays a role of introducing an air-fuel mixture from the intake pipe 13 or discharging the air-fuel mixture to the intake pipe 13.
Due to the operation of the suction chamber 14, the unevenness in the flow speed of the suction air at the suction port 10b is eliminated, and the suction efficiency is increased.

The lubricating oil supply device 30 supplies the lubricating oil in the oil tank 8 to the lubricating oil flow control device 3 by an oil pump 33 driven by a crankshaft 10c of the engine 10.
5 to the intake pipe 13. Specifically, the lubricating oil supply device 30 supplies the lubricating oil to the oil tank 8 →
Oil strainer 31 → suction pipe 32 → oil pump 33
It comprises a lubricating oil system for supplying to the engine 10 through a route from the discharge pipe 34, the lubricating oil flow control device 35, and the intake pipe 13.
The lubricating oil system further includes a return pipe 36 for returning lubricating oil from the lubricating oil flow control device 35 to the oil tank 8 as necessary. The crankshaft 10c drives the oil pump 33 directly or indirectly, and is configured to drive, for example, a gear, a belt, or a chain. Suction pipe 32, discharge pipe 34 and return pipe 36
Consists of, for example, a rubber hose.

FIG. 3 is a sectional view of the lubricating oil flow control device according to the present invention. The lubricating oil flow control device 35 is a solenoid type three-way valve that controls the flow of lubricating oil so as to match the operating state of the engine 10 by repeatedly opening and closing. The solenoid type three-way valve includes a housing 41 having a bottom, a lid 42 covering an upper opening of the housing 41, a cylindrical coil bobbin 43 built in the housing 41, an electromagnetic coil 44 wound around the coil bobbin 43, and a coil bobbin 4.
Core part 45 penetrating the bottom of housing 41 from the center of 3
, A valve body 46 that moves in the axial direction in the cylinder of the coil bobbin 43 to switch the oil passage, and a compression spring 47 that resiliently moves the valve body 46. 46a is an oil passage of the valve body.

In the lubricating oil flow control device 35, the oil inlet 35a extends laterally from the lid 42, the oil outlet 35b extends downward from the core 45, and the oil return port 35c extends upward from the lid 42. The oil inlet 35a is connected to the discharge pipe 34
The oil outlet 35b is connected to the intake pipe 13, and the oil return port 35c is connected to the return pipe 36. In such a lubricating oil flow control device 35, the valve body 46 rises when the electromagnetic coil 44 is not excited, and connects the oil inlet 35a and the oil outlet 35b. It descends to communicate the oil inlet 35a and the oil return port 35c.

FIG. 4 is a left side view of the engine according to the present invention, showing a structure in which a lubricating oil flow control device 35 is attached to an intake pipe 13 in an intake system of the engine 10. Cover 51 is shown.

FIG. 5 is a left side view around the intake port and the intake pipe of the engine according to the present invention. The intake pipe 13 is a flexible pipe such as a rubber hose, and the flexible pipe is formed by integrally forming two sockets (a first socket 13a and a second socket 13b). The first socket 13a is for inserting and connecting the intake chamber 14. The second socket 13b is for inserting and connecting the oil outlet 35b of the lubricating oil flow rate control device 35 and attaching the same. Since the lubricating oil flow control device 35 is directly attached to the intake pipe 13, no attachment member such as a support is required, and the attachment structure is simplified.
The intake chamber 14 is connected to the engine 10 via a stay 52.
Is attached to the intake port 10b. Specifically, the flange 10d of the intake port 10b, the flange 29a of the reed valve 29, the flange 13c of the intake pipe 13, the stay 52
(... denotes a plurality, the same applies hereinafter.).

FIG. 6 is a right side view of the engine according to the present invention, showing a structure of the engine 10 shown in FIG. 4 as viewed from the back side, and furthermore, a part of the cylinder cover 51 at the upper right is removed. It is. The crankcase 10a of the engine 10 has a water pump 54 attached to a front portion on the right side surface, and the oil pump 33 attached above the water pump 54. 33a is an oil pump control code. The crankcase 10a is one in which only the right side is covered with a side cover 55 indicated by imaginary lines.
Accordingly, the side cover 55 covers the oil pump 33 and the water pump 54.

FIG. 7 is a plan view around the engine according to the present invention. The oil tank 8 is arranged on one side (left or right side) from the center C of the vehicle body, and the lubricating oil flow control device 35 is connected to the center C of the vehicle body.
, The oil pump 33 is arranged on the other side (right or left) from the center C of the vehicle body.

Next, the operation of the lubricating oil supply device 30 having the above configuration will be described with reference to FIGS. As shown in FIG. 5, the lubricating oil flow control device 35 is disposed near the intake pipe 13 by being directly attached to the intake pipe 13. For this reason, the lubricating oil flow control device 35
Oil passage (oil outlet 35b and second socket 13b)
Is short. Therefore, the influence of disturbance due to the oil passage is small. Therefore, the flow rate of the lubricating oil supplied from the lubricating oil flow control device 35 to the intake pipe 13 can be controlled with high accuracy.

In FIG. 7, the lubricating oil in the oil tank 8 flows to an oil pump 33 via a suction pipe 32 passing behind the engine 10. The lubricating oil discharged from the oil pump 33 flows to an oil inlet 35a of the lubricating oil flow control device 35 via a discharge pipe 34 passing rightward of the engine 10. The lubricating oil returning from the oil return port 35c of the lubricating oil flow control device 35 flows to the return port of the oil tank 8 via the return pipe 36 passing through the left side of the engine 10.

The discharge pipe (oil passage) 34 from the oil pump 33 to the lubricating oil flow control device 35 is long. The lubricating oil flowing through the long discharge pipe 34 is greatly heated by the heat radiation of the engine 10 and thus has a low viscosity. On the other hand, the lubricating oil flow control device 35 allows a predetermined amount of lubricating oil (fluid) to flow through the controlled flow path, and greatly depends on the viscosity. In a high-viscosity lubricating oil, the viscosity greatly changes in accordance with a temperature change, so that the flow rate of the lubricating oil tends to be unstable.
In this regard, in a low-viscosity lubricating oil, the change in viscosity is small even when subjected to a temperature change, and the flow rate of the lubricating oil is stable. In the embodiment of the present invention, since the viscosity of the lubricating oil is small, it is easy to control the flow rate of the lubricating oil supplied from the lubricating oil flow control device 35 to the intake pipe 13, so that the control accuracy is further enhanced.

Next, a modification of the arrangement of the lubricating oil flow control device 35 will be described with reference to FIGS. The same components as those in the arrangement structure shown in FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 8 is a modified example (first modified example) of the arrangement structure of the lubricating oil flow control device according to the present invention.
0 intake port 10b, intake pipe 13, lubricating oil flow control device 3
The structure around 5 turns is seen from the left side. The arrangement structure of the lubricating oil flow control device 35 of the first modified example is characterized in that the lubricating oil flow control device 35 is attached to the intake chamber 14.
Specifically, a fitting protrusion 14a is integrally formed on the back surface of the intake chamber 14, and a stay 62 of the lubricating oil flow control device 35 is attached to the fitting protrusion 14a via an elastic ring 61 by snap fitting. is there. The oil outlet 35b of the lubricating oil flow control device 35 in this case is a hose (oil passage).
It will be connected to the second socket 13b via 63. According to the first modified example, the lubricating oil flow control device 35 can be freely arranged even at a position where it cannot be directly attached to the intake pipe 13.

FIG. 9 is a modified example (second modified example) of the arrangement structure of the lubricating oil flow control device according to the present invention.
0 intake port 10b, intake pipe 13, lubricating oil flow control device 3
The structure around 5 turns is seen from the left side. The arrangement structure of the lubricating oil flow control device 35 according to the second modified example is characterized in that the lubricating oil flow control device 35 is fastened to the intake port 10b of the engine 10 together with one end of the intake pipe 13 with bolts 53. . More specifically, to mount the lubricating oil flow control device 35, the flange 10d of the intake port 10b, the flange 29a of the reed valve 29, the flange 13c of the intake pipe 13, the stay 52 of the intake chamber 14, the lubricating oil flow control Device 3
5 is fastened together with bolts 53...

FIG. 10 is a sectional view taken along line 10-10 of FIG. 9, and shows the intake pipe 13, the lubricating oil flow control device 35 and the stay 64.
3 shows the mounting structure. The stay 62 and the stay 64 of the lubricating oil flow control device 35 are connected by fitting to a rubber joint 65. In this case, the oil outlet 35b of the lubricating oil flow control device 35 is connected to the second socket 13b via the hose 63. According to the second modification, the lubricating oil flow control device 35 can be freely arranged even at a position where it cannot be directly attached to the intake pipe 13.

In the first and second modified examples of the embodiment of the present invention, the lubricating oil flow control device 35 is provided with the intake pipe 1.
3, and may be arranged at an arbitrary position in consideration of various arrangements around the engine 10 irrespective of the front, rear, left and right or up and down of the intake pipe 13. Further, in the case of a configuration in which the lubricating oil flow control device 35 is directly attached to the intake pipe 13, the configuration is not limited to the configuration in which the lubricating oil flow control device 35 is inserted into the socket 13b. In the case of a configuration in which the lubricating oil flow rate control device 35 is mounted on the intake chamber 14, the configuration is not limited to the snap-fit configuration, but may be, for example, screwing.

[0030]

According to the present invention, the following effects are exhibited by the above configuration. According to the first aspect of the present invention, since the lubricating oil flow control device is disposed near the intake pipe, the oil passage from the lubricating oil flow control device to the intake pipe is short. Therefore, the influence of disturbance due to the oil passage is small. Therefore, the flow rate of the lubricating oil supplied from the lubricating oil flow control device to the intake pipe can be accurately controlled.

According to the second aspect of the present invention, the lubricating oil flow control device is disposed right or left from the center of the vehicle body and the oil pump is disposed left or right from the center of the vehicle. The oil passage to is long.
The lubricating oil flowing through the long oil passage is greatly heated by heat radiation of the engine, and thus has a low viscosity. Since the viscosity of the lubricating oil is small, it is easy to control the flow rate of the lubricating oil supplied from the lubricating oil flow control device to the intake pipe, so that the control accuracy is further improved. Further, since the arrangement of the lubricating oil flow control device is not limited to the position near the crankcase as in the related art, the degree of freedom in the arrangement of the lubricating oil flow control device is increased.

According to the third aspect of the present invention, since the lubricating oil flow control device is directly mounted on the intake pipe, no mounting member such as a support is required, and the mounting structure is simplified. Further, since the oil passage from the lubricating oil flow control device to the intake pipe can be further shortened, the influence of the disturbance caused by the oil passage on the lubricating oil flow control device is extremely small.

According to the fourth aspect of the present invention, since the lubricating oil flow control device is attached to the intake chamber branched from the intake pipe, the lubricating oil flow control device can be arranged at a position that cannot be directly attached to the intake pipe. The degree of freedom in the arrangement of the oil flow control device is increased.

According to the fifth aspect of the present invention, since the lubricating oil flow control device is bolted together with one end of the intake pipe to the intake port of the engine, the lubricating oil flow control device is located at a position where it cannot be directly attached to the intake pipe. The lubricating oil flow control device can be arranged with a higher degree of freedom in arrangement.

[Brief description of the drawings]

FIG. 1 is a left side view of a motorcycle according to the present invention.

FIG. 2 is a system diagram showing an intake system of an engine and a lubricating oil system of a lubricating oil supply device according to the present invention.

FIG. 3 is a sectional view of a lubricating oil flow control device according to the present invention.

FIG. 4 is a left side view of the engine according to the present invention.

FIG. 5 is a left side view around an intake port and an intake pipe of the engine according to the present invention.

FIG. 6 is a right side view of the engine according to the present invention.

FIG. 7 is a plan view around an engine according to the present invention.

FIG. 8 is a modified example of the arrangement structure of the lubricating oil flow control device according to the present invention (first modified example).

FIG. 9 is a modified example of the arrangement structure of the lubricating oil flow control device according to the present invention (second modified example).

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

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Motorcycle, 8 ... Oil tank, 10 ... Water-cooled two-stroke engine, 10b ... Inlet, 10c ... Crankshaft, 10d ... Flange, 12 ... Vaporizer, 13 ... Intake pipe, 13a ... First socket, 13b ... 2nd socket, 1
4 intake chamber, 30 lubricant oil supply device, 33 oil pump, 35 lubricant oil flow control device, 52, 62, 6
4 stay, 53 bolt, 63 hose, C center of vehicle.

Claims (5)

[Claims] 1. A two-stroke engine for supplying lubricating oil to an intake pipe of an engine via a lubricating oil flow control device using an oil pump driven by a crankshaft, wherein the lubricating oil flow control device is located near the intake pipe. An arrangement structure of a lubricating oil flow control device for a two-stroke engine, characterized in that the arrangement device is arranged in the same manner. 2. The lubricating oil flow control device according to claim 1, wherein the lubricating oil flow control device is arranged right or left from the center of the vehicle body, and the oil pump is arranged left or right from the center of the vehicle body.
An arrangement structure of the lubricating oil flow control device for a two-stroke engine described in the above. 3. The lubricating oil flow control device according to claim 1, wherein the lubricating oil flow control device is directly attached to the intake pipe.
An arrangement structure of the lubricating oil flow control device for a two-stroke engine described in the above. 4. An intake chamber through which an air-fuel mixture can enter and exit from the intake pipe, and the lubricating oil flow control device is mounted in the intake chamber.
Or the arrangement structure of the lubricating oil flow control device for a two-stroke engine according to claim 2. 5. The lubricating oil flow control device according to claim 1, wherein the lubricating oil flow control device is attached to an intake port of the engine together with one end of the intake pipe by bolts. Arrangement structure of lubricating oil flow control device for cycle engine.