JP2000249033A - Flywheel cleaning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To invariably keep recessed tooth forming faces at a smooth state and to prevent the erroneous recognition of signals by providing a grinding means movable in the attaching or separating direction to or from a flywheel formed with a plurality of recessed teeth serving as part of a rotation detecting sensor on the side face, and controlling the position of the grinding means interlockingly with the start of an engine. SOLUTION: When a starting switch is operated at the time of the start of an internal combustion engine 1, a shaft 9a is moved to the right direction by the excitation of a magnet switch 9, and an overrunning clutch 8b is moved to the left direction via a lever 10. A pinion gear 8c is meshed with a ring gear 4 formed on a flywheel 3 for cranking the internal combustion engine 1. When the pinion gear 8c is moved, a brush 8f is concurrently moved into contact with recessed tooth forming faces 3A on the side face of the flywheel 3, the recessed tooth forming faces on the side face of the rotating flywheel 3 are cleaned, thereby the detection of recessed teeth 5, i.e., rotation detection, by a magnet pickup 6 can be made without erroneous operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a flywheel cleaning apparatus for cleaning a flywheel of an internal combustion engine.

[0002]

2. Description of the Related Art In recent years, in a diesel internal combustion engine, a high-pressure pump driven by the engine pressurizes fuel to the same pressure as the injection pressure and stores the fuel in a pressure accumulating chamber. This high-pressure fuel is provided in an electromagnetic valve provided for each cylinder. An electronically controlled diesel internal combustion engine equipped with a common rail system that controls the fuel injection amount and fuel injection timing for each cylinder by electronically controlling the opening and closing time and opening and closing time of the solenoid valve has been commercialized. ing.

In order to control the opening / closing timing of the solenoid valve, it is necessary to accurately grasp the piston position for each cylinder.
The common rail system detects a pulse synchronized with the rotation of the flywheel and a pulse synchronized with the rotation of the high-pressure pump, and controls the fuel injection amount and the fuel injection timing to each cylinder based on the detection signal. I have. The detection of the pulse synchronized with the rotation of the flywheel is performed by a sensor including a concave tooth formed on a side surface of the flywheel and a magnet pickup fixed to face the concave tooth. Specifically, a change in magnetic flux when the concave tooth passes through the magnet pickup is converted into a voltage, and when the voltage exceeds a predetermined value, a detection signal is output.

[0004]

However, if the internal combustion engine is used for a long period of time, depending on the use environment, frost may occur on the surface of the flywheel on which the concave teeth are formed due to dew condensation or the like. Deteriorates (aging). In this case, the distance between the flywheel and the magnet pickup changes due to deterioration of the surface of the flywheel, and noise is generated in the detection value of the magnet pickup, and such noise may be erroneously recognized as a normal pulse. There is.

FIG. 4B shows the relationship between the surface of the flywheel 30 on which the concave teeth 50 are formed (concave tooth forming surface) and the magnet pickup 60 disposed opposite to the concave tooth forming surface. FIG. 4A schematically shows an example of a detection signal of the magnet pickup 60. As shown in FIG. 4B, when the flywheel 30 is deteriorated and rust B is generated on the surface, noise is generated as indicated by A in FIG. 4A, and the output value of the noise is set in advance. If the value exceeds the set predetermined value, this signal is erroneously detected (erroneously recognized). Further, if such noise is erroneously recognized as a correct signal, it becomes difficult to inject fuel at the correct timing, and there is a possibility that the internal combustion engine cannot be operated or started.

Japanese Unexamined Utility Model Publication No. 59-96365 discloses a technique for preventing the generation of rust due to the adhesion of dust to the ring gear by covering the periphery of the ring gear of the flywheel with a donut-shaped enclosure. However, this technique has a problem that once the concave tooth forming surface of the flywheel is deteriorated due to rust or the like, noise of the output signal cannot be removed.

The present invention has been made in view of such a conventional technique, and is intended to clean a surface of a flywheel on which concave teeth are formed and to keep the surface smooth, thereby preventing erroneous recognition of a signal. It is an object of the present invention to provide a flywheel cleaning device.

[0008]

According to a first aspect of the present invention, there is provided a flywheel cleaning apparatus according to the present invention, wherein a flywheel having a plurality of concave teeth formed on a side surface as a sensor for detecting a rotation signal of an internal combustion engine; A concave tooth forming surface polishing means movably supported between a position contacting the concave tooth forming surface of the flywheel and a position separating from the concave tooth forming surface, and configured to polish the concave tooth forming surface at the time of corresponding contact; Position control means for controlling the position of the concave tooth forming surface polishing means in conjunction with the start of the internal combustion engine is provided. As a result, the concave tooth forming surface of the flywheel can be cleaned by the concave tooth forming surface polishing means, and the concave tooth forming surface can be smoothed, thereby preventing erroneous recognition of a signal from the sensor.

According to the second aspect of the present invention, the position control means moves the concave tooth forming surface polishing means to a position abutting on the flywheel in conjunction with a starting device attached to the internal combustion engine. At the time of starting, the concave tooth forming surface of the flywheel can be cleaned by the concave tooth forming surface polishing means and the concave tooth forming surface can be smoothed, so that erroneous recognition of a signal from the sensor at the time of starting can be prevented. .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. In FIG. 1, reference numeral 1 denotes a diesel internal combustion engine (hereinafter simply referred to as an internal combustion engine) mounted on a vehicle, and a flywheel 3 is fixed to a crankshaft 2 of the internal combustion engine 1. Is formed with a ring gear 4. A plurality of concave teeth 5 are formed on the right side surface of the flywheel 3 in the drawing, and a magnet pickup 6 is fixed to the vehicle body at a position facing the concave teeth 5. The concave tooth 5 and the magnet pickup 6 constitute a sensor for detecting the piston position of each cylinder.

A starting device (starter) 7 for starting the internal combustion engine 1 mainly comprises an armature 8 and a magnet switch 9. Rotary shaft 8a of armature 8
Is provided with an overrunning clutch 8b which rotates integrally with the rotating shaft 8a and is slidable in the axial direction. A pinion gear 8c is fixed to an output shaft end of the overrunning clutch 8b.

The overrunning clutch 8b is provided with a thrust direction restriction ring 8d whose movement in the thrust direction is restricted and which is not restricted in the rotation direction. The ring 8d has a metal brush 8f as a concave tooth forming surface polishing means fixed to the support plate 8e.
Has been fixed. Further, as shown in FIG. 2, the brush 8f is provided at a position facing the concave teeth 5.

In the vehicle body, the brush 8f is always opposed to the concave tooth forming surface 3A of the flywheel 3 so as not to be synchronized with the rotation of the shaft 8a (ie, not to rotate integrally with the shaft 8a). And a guide (not shown) for restricting the movement of the brush 8f or the support plate 8e in the rotational direction. The magnet switch 9 is for engaging the pinion gear 8c with the ring gear 4 at the time of starting. Here, one end of a lever 10 that can rotate around a fulcrum 10a is connected to the shaft 9a of the magnet switch 9. The other end of the lever 10 is connected to the overrunning clutch 8b as shown.

At the time of starting, the shaft 9a of the magnet switch 9 moves, the lever 10 rotates around the fulcrum 10a, and the overrunning clutch 8b moves in the axial direction, so that the pinion gear 8c and the ring gear 4 are moved.
And at the same time, the brush 8f abuts against the concave tooth forming surface 3A of the flywheel 3, and the concave tooth forming surface 3A
Is to be cleaned. The starting device (starter) 7 is provided with a concave tooth forming surface polishing means (brush) 8f.
Also has a function as a position control means for controlling the position of.

Since the flywheel cleaning device according to one embodiment of the present invention is configured as described above, when the internal combustion engine 1 is started, the shaft 9a is moved by energizing the magnet switch 9 by operating the start switch. The overrunning clutch 8b moves in the middle right direction via the lever 10, and moves in the left direction in the figure. As a result, the pinion gear 8c meshes with the ring gear 4 formed on the flywheel 3, and at the same time, the brush 8f also moves to the left in the figure and comes into contact with the concave tooth forming surface 3A on the side surface of the flywheel 3. At this time, power is supplied to the armature 8 so that the shaft 8a
Rotates, and this rotation is transmitted to the pinion gear 8c via the overrunning clutch 8b, the ring gear 4 rotates, and the internal combustion engine 1 starts.

Therefore, when the internal combustion engine 1 is started, the brush 8f always brushes the concave tooth forming surface 3A of the flywheel 3, so that, for example, the internal combustion engine 1 is not started for a long time, and the concave tooth of the flywheel 3 is not used. Even when rust or the like is generated on the formation surface 3A and the surface is deteriorated, erroneous recognition of a pulse can be prevented by cleaning and smoothing the concave tooth formation surface 3A at the time of starting. In addition, it is possible to reliably prevent poor startability due to erroneous pulse recognition.

When the internal combustion engine 1 is started and the start switch is turned off, the shaft 9a of the magnet switch 9 moves leftward in the figure (the position shown in FIG. 1), and the overrunning clutch 8b is moved via the lever 10 in the figure. Moving rightward, the pinion gear 8c is disengaged from the engagement position with the ring gear 4 as shown in FIG. 1, and the brush 8f is also separated from the concave tooth forming surface 3A of the flywheel 3.

Therefore, for example, even if the concave tooth forming surface 3A is deteriorated, it can be cleaned and smoothed by polishing the brush 8f, and after the internal combustion engine 1 starts, the brush 8f and the concave tooth forming surface 3A can be cleaned. The contact between the brush 8f and the flywheel 3 can be suppressed more than necessary. As shown in FIG. 3, if the brush 8f is built into the brush 8f and the brush 8f is constantly pressed against the concave tooth forming surface 3A with a constant pressing force, the concave tooth can be obtained in addition to the above-described effect. Excessive wear of both the forming surface 3A and the brush 8f can be suppressed. Also, brush 8f
The same effect as described above can be obtained even if the support plate 8e to which is connected is made of a material having elasticity capable of generating a desired pressing force, such as metal or resin.
Even if both are used at the same time, the same effect as described above can be obtained.

The surface that is in contact with the concave tooth forming surface 3A and polishes the surface is not limited to a brush. For example, a nonwoven fabric, a grindstone, or the like is in contact with the concave tooth forming surface 3A of the flywheel 3 to form the concave tooth. Any material can be used as long as it can remove rust generated on the surface 3A. The means for moving the brush 8f (position control means) is configured as described above, that is,
The brush 8f is supported on the overrunning clutch 8b via the support plate 8e, and the brush 8f is not limited to the configuration in which the brush 8f is moved only at the time of starting in conjunction with the overrunning clutch 8b. Alternatively, the brush may be moved at an arbitrary timing to polish the concave tooth forming surface 3A.

[0020]

As described above in detail, according to the flywheel cleaning device of the present invention, a flywheel having a plurality of concave teeth formed on a side surface as a sensor for detecting a rotation signal of an internal combustion engine. And a concave tooth forming surface polishing means movably supported between a position abutting on the concave tooth forming surface of the flywheel and a position separating from the concave tooth forming surface, and configured to polish the concave tooth forming surface at the time of corresponding contact. And the position control means for controlling the position of the concave tooth forming surface polishing means in conjunction with the start of the internal combustion engine, so that the concave tooth forming surface of the flywheel is cleaned and smoothed by the concave tooth forming surface polishing means. Erroneous recognition of the signal from the sensor can be prevented, and the cylinder discrimination of the multi-cylinder internal combustion engine can be accurately performed.

Further, in the invention according to claim 2, the position control means is arranged such that the position control means contacts the flywheel at a position in contact with a flywheel in conjunction with a starting device attached to the internal combustion engine. Since the polishing means is moved, the concave tooth forming surface of the flywheel can be cleaned and smoothed by the concave tooth forming surface polishing means at the time of starting the internal combustion engine, thereby preventing erroneous recognition of a signal from a sensor at the time of starting the internal combustion engine. It is possible to improve the startability of the multi-cylinder internal combustion engine.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main part of an internal combustion engine to which the present invention is applied.

FIG. 2 is an enlarged view showing a portion C in FIG. 1;

FIG. 3 is a main part configuration diagram showing a modified example of a brush as a concave tooth forming surface polishing means.

4A is a diagram illustrating a sensor output when a concave tooth forming surface is deteriorated, and FIG. 4B is a diagram schematically illustrating a state when the concave tooth forming surface is deteriorated.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 internal combustion engine 2 crankshaft 3 flywheel 3A concave tooth forming surface 5 concave tooth forming sensor 6 magnet pickup forming sensor 7 starting device (starter) also serving as position control means 8 armature 8a rotating shaft 8b overrunning Clutch 8c Pinion gear 8d Thrust direction restraining ring 8f Brush (polishing means for forming concave teeth) 9 Magnet switch 10 Lever

Claims (2)

[Claims] 1. A flywheel having a plurality of concave teeth formed on a side surface as a sensor for detecting a rotation signal of an internal combustion engine, and moving between a position in contact with a concave tooth forming surface of the flywheel and a position separated therefrom. A concave tooth forming surface polishing means, which is supported so as to be able to polish the concave tooth forming surface when the contact is made, and a position for controlling the position of the concave tooth forming surface polishing means in conjunction with the start of the internal combustion engine. A flywheel cleaning device comprising control means. 2. The polishing apparatus according to claim 1, wherein said position control means moves said concave tooth forming surface polishing means to a position in contact with a flywheel in conjunction with a starting device attached to said internal combustion engine. A flywheel cleaning device as described.