JPS6145282Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a lubricating oil supply device for an engine equipped with a supercharger that supplies supercharging air to the engine.

Generally, in a two-cycle engine or the like, lubricating oil is supplied to the intake system of the engine to ensure piston sliding performance and sealing performance. In this case, lubricating oil is supplied by a metering pump driven by the engine. The cam rotation lever of the metering pump changes depending on the engine load.
More specifically, since the lubricating oil is operated in proportion to the amount of depression of the accelerator pedal, the amount of lubricating oil supplied is controlled to be proportional to the engine load.

However, in engines equipped with a supercharger, the engine output increases rapidly when the accelerator pedal is depressed, so simply controlling the lubricant supply in proportion to the amount of accelerator pedal depression as described above is not sufficient to control the lubricant supply. The amount of lubricating oil cannot keep up with the sudden increase in engine output, and the sliding properties of the piston cannot be effectively maintained due to lack of lubricating oil, resulting in problems such as seizure.

In this regard, Japanese Utility Model Application Publication No. 51-123444 proposes a lubricating oil pressure control device that controls the supply amount of lubricating oil according to the boost pressure (supercharging pressure) in a supercharged engine. There is.

The present invention was developed as part of such an attempt, and is a lubrication system for supercharged engines that can control the amount of lubricant supplied in proportion to the engine output without changing the structure of the metering pump. The purpose is to provide an oil supply device.

Therefore, in the present invention, the central axes of rotation of the cam rotation lever of the metering pump and the rotation lever such as the throttle opening/closing lever linked to the accelerator pedal are arranged apart from each other, and
A cam rotation lever and a rotation lever interlocked with an accelerator pedal are interconnected by an elastic connection member.
This elastic connecting member rotates the cam rotation lever of the metering pump to its maximum rotation amount when the rotation lever linked to the accelerator pedal reaches a certain amount of rotation. At this position, further rotation of the rotary lever interlocked with the accelerator pedal is allowed by self-elastic deformation.

That is, by using an elastic connecting member, the operating characteristics of the cam rotating lever of the metering pump are set to match the output characteristics of the supercharged engine relative to the rotating lever that is linked to the accelerator pedal. Differences in operating characteristics between the two rotary levers can be absorbed by elastic deformation of the elastic connecting member.

Hereinafter, the present invention will be described in more detail based on illustrated embodiments.

In FIG. 1, 1 is an engine such as a 2-cycle engine equipped with a supercharger 3 in an intake passage 2, 4 is a throttle valve, and 5 is a rotation axis of the throttle valve 4 for opening and closing the throttle valve 4. This throttle lever 5 moves the throttle valve 4 from its fully closed position A to its fully open position B in proportion to the amount of depression of the accelerator pedal (not shown). Open and close between.

On the other hand, 6 is a metering pump driven by an output shaft (not shown) of the engine 1, and 7 is a cam rotation lever that determines the discharge amount of the metering pump 6 each time.

As shown in FIG. 2, this cam rotation lever 7 consists of two upper and lower concentric cams 10, 10 housed in a cam chamber 9 of a housing 8 of a metering pump 6.
The base of the camshaft 11 is fixed to the camshaft 11 by a nut 12, and by the rotation of the cam rotation lever 7, the camshaft 11 supported by the housing 8 with a seal 13 interposed therebetween is rotated, and the concentric cams 10, 10 and the concentric A connecting shaft 14 integrally formed between the cams 10, 10 is rotated.

The concentric cams 10, 10 and the connecting shaft 14 are connected to the third
As shown in the figure, the axial stroke amount of the worm wheel 16 is set in conjunction with chevron cams 17, 17 provided on the worm wheel 16, which is rotationally driven by a worm 15 driven in synchronization with the rotation of the engine 1. During one rotation of the worm wheel 16, the angle-shaped cams 17, 17
riding on the concentric cams 10, 10, and the concentric cam 1
The metering pump 6 repeats the reciprocating motion of fitting between 0 and 10 and abutting the connecting shaft 14 twice, and in response to this reciprocating motion, the metering pump 6 sucks lubricating oil from the suction port (not shown) and absorbs the sucked lubricant. Oil discharge port 18,
..., 18. In addition, in the case of a 2-cylinder 2-cycle engine, 2 of the 4 discharge ports 18
One is used to supply fuel to the intake passage, and the other two are used to directly supply fuel to the combustion chamber. camshaft 11
The axial movement of is prevented by a stopper 19.

The phase of the connecting shaft 14 with respect to the concentric cams 10, 10 shown in FIGS. 2 and 3 indicates when the engine 1 is operating under a light load, and from this state, when the cam rotation lever 7 is rotated approximately 80 degrees. , the amount of eccentricity of the connecting shaft 14 with respect to the chevron cams 17, 17 becomes maximum, the stroke amount of the worm wheel 16 becomes the maximum, and the discharge amount of the metering pump 6 becomes the maximum.

As shown schematically in FIG. 1, the free end of the cam rotation lever 7 of the metering pump 6 and the free end of the throttle lever 5 which is linked to the accelerator pedal are connected to each other by an elastically deformable rod-shaped link or the like. Using a combination of connecting links 20, connecting fittings 21,
By fixing each end of the connecting link 20 to 22, the connecting link 20 is three-dimensionally connected.

For example, when the throttle lever 5 is rotated from its initial position a to an intermediate rotation position b, which is approximately 60 degrees, the connecting link 20 moves the cam rotation lever 7 from its initial position A to approximately 60 degrees. The lever ratio is set so that the cam is rotated to the maximum rotation position B, which is rotated by 80 degrees. The amount of rotation of the movable lever 7 is set to be large.

When the throttle lever 5 is further rotated from the intermediate rotation position b by depressing the accelerator pedal, the cam rotation lever 7 of the metering pump 6 is already at the maximum rotation position (fully open position). B
Because it cannot rotate any further due to
The connecting link 20 is elastically deformed from the state shown by the one-dot chain line 20' in FIG. Rotation from intermediate rotation position b to maximum rotation position c (throttle fully open position) is permitted.

With the above configuration, the amount of lubricating oil supplied can be increased earlier than the throttle valve opening, that is, the amount of accelerator pedal depression, as shown by the solid line in FIG. It is possible to have a characteristic that corresponds almost one-to-one to the output characteristic of the supercharged engine 1, and there is no response delay even when the output of the supercharged engine suddenly increases when the accelerator pedal is depressed. Lubricating oil can be supplied without any need for lubricating oil.

The dotted line shown in FIG. 4 is the conventional lubricating oil supply characteristic of an engine without a supercharger.

In addition, in the above embodiment, a throttle lever was used as a rotary lever linked to an accelerator pedal, but the present invention is not limited to this.
In addition, as an example of the elastic connection member, a connection link that is flexibly deformed has been explained above as an example, but for example, a coil spring may be incorporated into a part of the connection member, and the elastic deformation of the coil spring may cause the accelerator pedal to move. A configuration may be adopted in which the rotation lever that is linked to the rotation lever is allowed to rotate from an intermediate rotation position to a maximum rotation position.

As is clear from the above description, according to the present invention, there is an advantage that lubricating oil can be accurately supplied in accordance with the lubricating oil required characteristics that match the output characteristics of a supercharged engine.

[Brief explanation of the drawing]

Fig. 1 is an overall schematic explanatory diagram of the lubricating oil supply system for a supercharged engine according to the present invention, Figs. 2 and 3 are cross-sectional explanatory diagrams of main parts showing the structure of the metering pump, and Fig. 4 is an explanatory diagram of the main parts of the metering pump structure. It is a graph showing the supply characteristics of lubricating oil obtained by the invention. 1...Engine, 2...Intake passage, 3...Supercharger, 5...Throttle lever, 6...Metering pump, 7...Cam rotation lever, 20...Connection link.

Claims (1)

[Scope of Claim for Utility Model Registration] In a supercharged engine that supplies lubricating oil to the engine intake system by operating the cam rotation lever of the metering pump according to the load, the cam of the metering pump described above The rotation center axis of the rotation lever and the rotation center axis of the rotation lever linked to the accelerator pedal are arranged to be separated from each other, and the cam rotation lever is placed at an intermediate rotation position of the rotation lever linked to the accelerator pedal. The two rotating levers are connected to each other by an elastic connecting member that allows maximum rotation of the rotating lever linked to the accelerator pedal after the maximum rotation of the cam rotating lever. Lubricating oil supply system for supercharged engines.