JPH10227272A - Flywheel rotation detection mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make such state surely that an engine can not start when a turning bar is inserted in a flywheel and can start only when the turning bar is removed from the flywheel and improve its safety without the generation of a mis- operation. SOLUTION: This mechanism is constituted so that a turning switch 3 is directly installed in a flywheel housing 1 and also a window 1a for turning for inserting/removing a turning bar 4 to/from the flywheel and a window cover 2 for opening/closing the window 1a for turning are provided on the flywheel housing 1 and the turning switch 3 is operated and the flywheel can be started when the turning bar 4 inserted to the window 1a for turning is removed and the window cover 2 is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flywheel rotation detecting mechanism for detecting a rotation state and a rotatable state of a flywheel in an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, there has been known an internal combustion engine in which a turning bar, which is a rod-shaped member, is inserted into a flywheel when the engine is not operated, and the turning bar is pulled out of the flywheel when the engine is operated.
In such an engine, when a turning bar pulled out of the flywheel is inserted into a turning bar case installed near the engine or in the engine room, a turning switch attached to the turning bar case operates to generate a start permission signal. Thus, a flywheel rotatable state detection mechanism that enables the engine to start was provided.

For example, as shown in FIG. 5, when a turning bar 4 is inserted into a turning bar case 10 installed near an engine or in an engine room, a contact piece 3 of a turning switch 3 is turned on.
a contacts the turning bar 4 and the turning switch 3 is activated. The operation of the turning switch 3 generates a start permission signal and sends it to a start control circuit (not shown), thereby enabling the start of the engine.

Further, as a flywheel rotation detecting mechanism, for example, in the case of an electric start type engine, a ring gear fitted around the flywheel is used for detection by a detector. If not, a hole for turning bar insertion or the like provided on the outer periphery of the flywheel is used instead for detection.

For example, as shown in FIGS. 6 and 7, a ring gear 8 externally fitted to a flywheel 5 'is used, or turning bar insertion holes 7' provided at equal intervals on the outer periphery of the flywheel 5 '. The rotational speed of the flywheel was detected by using 7 '.

[0006]

First, in the conventional flywheel rotatable state detection mechanism, one engine and one
If only the turning bar is inserted into the turning bar case, it can be said that the turning bar has been securely removed from the flywheel.However, multiple engines and multiple turning bars are If it is above, for example, if a turning bar that has been removed from a certain engine is inserted into the turning bar case of the engine where the turning bar is still inserted, the engine with the turning bar still inserted Therefore, a start permission signal is generated. As described above, a turning bar that has been withdrawn from an engine is erroneously inserted into a turning bar case of another engine, and a start permission signal may be generated for an engine into which the turning bar is inserted. .

[0007] Regarding the method of detecting the rotation of the flywheel, when a ring gear is mounted on the flywheel, the ring gear is used for detecting rotation, and when not mounted, the ring gear is mounted. Rotation was detected by a turning bar insertion hole provided at a different position from the position, so the installation position of the rotation detector was changed with or without the ring gear attached, and multiple rotation detectors were installed Had to be done.

[0008]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. That is, in an internal combustion engine that determines whether or not to start by activating a turning switch, a turning window is directly attached to a flywheel housing, and a turning window for inserting and removing a turning bar from the flywheel is provided on the flywheel housing. And a window cover that opens and closes the turning window is provided, and when the turning bar inserted into the turning window is pulled out and the window cover is closed, the turning switch is operated to be able to start. is there.

Further, in an internal combustion engine provided with an engine speed detecting device in a flywheel portion, an engine speed detecting hole is provided on the outer periphery of the flywheel, and the engine speed and the ring gear when the ring gear is not mounted on the flywheel. And the engine speed when the engine is mounted is detected at the same position.

[0010]

Next, an embodiment of the present invention will be described. 1 is a front view showing a flywheel housing provided with a rotatable state detecting mechanism of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a rear view showing a flywheel of the present invention, FIG. 5 is a view showing a conventional rotatable state detection mechanism, FIG. 6 is a front view showing a conventional flywheel, and FIG. 7 is a side sectional view of the same.

First, the rotatable state detecting mechanism of the present invention will be described with reference to FIGS. A turning window 1a is opened in the side surface of the flywheel housing 1 so that the turning bar 4 can be inserted into the turning bar insertion hole of the flywheel built in the flywheel housing 1 through the turning window 1a. A turning switch 3, which is a limit switch, is attached to the side of the flywheel housing 1 below the turning window 1a.

A window cover 2 for covering the turning window 1a is provided on the outer periphery of the turning window 1a. The window cover 2 is formed in an arc shape according to the side surface shape of the flywheel housing 1, and the lower end is folded outward in the radial direction to protrude to form a folded portion 2a. The window cover 2 is attached to the flywheel housing 1 so as to be rotatable around the upper end of the window cover 2.
Can be brought into close contact with the side surface of the flywheel housing 1 to close the turning window 1a, or the lower end of the window cover 2 can be lifted upward to open the turning window 1a.

When the window cover 2 is closed, the folded portion 2a of the window cover 2 comes into contact with the contact piece 3a of the turning switch 3, and the turning switch 3 is operated. The window cover 2 can be detachably attached to the flywheel housing 1. In this case, when the window cover 2 is attached to the flywheel housing 1, the turning window 1a is closed and the window cover 2 is connected to the flywheel housing 1. Then, the turning window 1a is opened.

When the engine is not operated, the turning window 1a is opened and the turning bar 4 is inserted into the flywheel in the flywheel housing 1 from the turning window 1a when the engine is not operated. When the turning bar 4 is inserted, since the turning bar 4 protrudes out of the flywheel housing 1, the window cover 2 is locked by the turning bar 4 and cannot be closed. do not do. Even when the window cover 2 is configured to be detachable from the flywheel housing 1, the turning switch 3 cannot be operated because the window cover 2 cannot be attached.

When the engine is operated, when the turning bar 4 is pulled out of the flywheel, the window cover 2 is turned around the upper end of the window cover 2 and closed, and the turning portion 2a is turned by the turning switch 3. By contacting the contact piece 3a, the turning switch 3 is operated, a start permission signal is generated, and the start permission signal is sent to a start control circuit (not shown), thereby enabling the start. In addition, window cover 2
Is detachable from the flywheel housing 1, the window cover 2 can be attached when the turning bar 4 is pulled out of the flywheel, and when the window cover 2 is attached to the flywheel housing 1, the turning switch 3 is activated. The start is enabled by generating a start permission signal and sending it to a start control circuit (not shown).

As described above, the engine cannot be started when the turning bar 4 is inserted into the flywheel, and can be reliably started only when the turning bar 4 is pulled out of the flywheel. Therefore, the safety can be improved without any operation error or the like.

Next, the rotation detection mechanism of the flywheel according to the present invention will be described with reference to FIGS. On the outer peripheral front side of the flywheel 5, a plurality of turning bar insertion holes 7, 7... Are provided at equal intervals. A plurality of rotation number detecting holes 6.6 are provided on the outer peripheral back side of the flywheel 5.
Are arranged at equal intervals. Are provided at the same positions as the positions where the ring gear 8 is fitted when the ring gear 8 is fitted on the outer periphery of the flywheel 5.

In order to detect the rotation speed of the flywheel 5 formed as described above, a detector is arranged on the outer peripheral portion of the flywheel 5 to detect the rotation speed. When fitted, the detector is arranged at a position where the rotation can be detected by utilizing the rotation of the ring gear 8.

On the other hand, when the ring gear 8 is not fitted on the flywheel 5, the rotation speed of the flywheel 5 is detected by using the rotation speed detection holes 6,. The number of rotation detection holes 6, 6,...
Is provided at the same position as the fitting position when fitting is performed, the detector may be disposed at the same position as when the detection is performed using the ring gear 8.

As described above, regardless of whether the ring gear 8 is mounted or not, if the same detector is installed at the same position, the rotation speed of the flywheel 5 can be detected.
There is no need to provide a plurality of detectors or change the installation positions of the detectors, so that the rotation detection mechanism can be simplified, and costs and labor can be reduced.

[0021]

As described above, the present invention has the following advantages. That is, with the configuration as described in claim 1, the engine cannot be started when the turning bar is inserted into the flywheel, and the engine can be started only when the turning bar is removed from the flywheel. The safety was improved without any operational errors.

In addition, since it is configured as described in claim 2,
Regardless of whether the ring gear is mounted or not, if the same detector is installed at the same position, the rotation speed of the flywheel can be detected.It is necessary to provide multiple detectors or change the installation position of the detector Therefore, the rotation detecting mechanism can be simplified, and the cost and labor can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing a flywheel housing provided with a rotatable state detection mechanism of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a rear view showing the flywheel of the present invention.

FIG. 4 is a side sectional view of the same.

FIG. 5 is a diagram showing a conventional rotatable state detection mechanism.

FIG. 6 is a front view showing a conventional flywheel.

FIG. 7 is a side sectional view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flywheel housing 1a Turning window 2 Window cover 3 Turning switch 4 Turning bar 5 Flywheel 6 Revolution detection hole 7 Turning bar insertion hole 8 Ring gear

Claims (2)

[Claims] In an internal combustion engine that determines whether or not to start by activating a turning switch, a turning switch is directly attached to a flywheel housing, and a turning bar is inserted into and removed from the flywheel housing. A turning window, and a window cover for opening and closing the turning window are provided,
A flywheel rotation detecting mechanism, wherein when the turning bar inserted into the turning window is pulled out and the window cover is closed, a turning switch is activated to enable starting. 2. An internal combustion engine provided with an engine speed detecting device in a flywheel portion, wherein an engine speed detecting hole is provided on an outer periphery of the flywheel and an engine speed and a ring gear when a ring gear is not mounted on the flywheel. A flywheel rotation detecting mechanism configured to detect an engine speed at the same position as when the engine is mounted.