JPH10220263A - Detector for timing pulse of engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the exchange of detecting members, and facilitate the detection of a different rotational position of a crankshaft by detachably installing a detecting member for detecting the rotational position of a crankshaft by a proximity sensor to the crank shaft by a fastening member. SOLUTION: A detecting member 60 is fitted to a small diameter part 32f of a crankshaft 32. While a first pulley 32a is fitted to the small diameter part 32f, a projection part 32d of the first pulley 32a is inserted into an elongate hole 62 of a detecting member 60. A second pulley 32b is fitted to the small diameter part 32f. A third pulley 32c is fitted to the small diameter part 32f of the crankshaft 32. A bolt B2 is screwing-connected around a female screw arranged on an end part of the crankshaft 32 through a washer 55. The detecting member 60 is detachably installed on the crankshaft 32 by the bolt B2 in order to detect the rotational position of the crankshaft 32 by a proximity sensor 51m. It is thus possible to exchange the detecting member 60 easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement in an engine timing pulse detecting device.

[0002]

2. Description of the Related Art As a timing pulse detecting device for an engine, for example, a timing pulse detecting device for a four-cycle engine is known from Japanese Patent Application Laid-Open No. HEI 6-117289. The above technique provides an engine timing pulse detection device capable of accurately extracting a plurality of types of timing pulses, and as shown in FIG. A fixed cam pulley 57 _R , a magnetic body 61 to be detected attached to the rear surface of the cam pulley 57 _{R with} a plurality of rivets 68, and a detection section 61 erected on the outer periphery of the magnetic body 61 to be detected.
₁ , 61 ₂ , and 61 _3, and an ignition trigger coil 63 that outputs a signal when approaching the detected parts 61 ₁ and 61 _2.
When, in which and a cylinder discriminating coil 62 for outputting a signal when in proximity with the detector 61 _3.

[0003]

[0007] As described above, in the form of mounting the object to be detected magnetic body 61 to the cam pulley 57 _R,
The rotation speed of the magnetic body 61 to be detected is １ ／ of the rotation speed of the crankshaft, and the output signals from the cylinder discriminating coil 62 and the ignition trigger coil 63 are reduced. For this reason, it is necessary to make the cylinder discriminating coil 62 and the ignition trigger coil 63 large and high output.

[0004] Of the two types of coils 62 and 63,
For placing one of the inner side of the cam pulley 57 _R, there is a disadvantage that undergo space constraints. Further, in general, when the magnetic body to be detected is formed integrally with the pulley, there is a disadvantage that when the magnetic body to be detected is replaced, the pulley must be replaced together. Therefore,
An object of the present invention is to provide an engine timing pulse detecting device in which only a detecting member, which is a magnetic body to be detected, is detachable from a crankshaft.

[0005]

According to one aspect of the present invention, a detecting member for detecting a rotational position of a crankshaft by a proximity sensor is detachably attached to the crankshaft with a fastening member. Was. The detection member can be replaced, and different rotational positions of the crankshaft can be easily detected.

According to a second aspect of the present invention, the detecting member is provided with an annular portion connecting a plurality of detecting pieces. When the detection member rotates, the annular portion can suppress the detection piece from being deformed by centrifugal force.

According to a third aspect of the present invention, one of a plurality of equally spaced detection pieces is arranged on the circumference of the detection member. The proximity sensor can detect the crank angle from equally-spaced detection pieces, and can detect the top dead center position from a portion lacking one of the detection pieces.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a side view of an outboard motor according to the present invention. An outboard motor 1 is mounted on a mount case (engine support case) 2 as an engine mounting member, and is connected to a vertical multi-cylinder engine 3 which is bolted and connected. An extension case 4 which is bolted under the mount case 2 to form an exhaust expansion chamber, a vertical drive shaft 5 housed in the extension case 4 and transmitting power from the engine 3, and attached to a lower portion of the extension case 4. A gear case 6, a bevel gear set and a dog clutch device 7 housed in the gear case 6 for switching between forward and backward, a propeller 8 connected to the bevel gear set and rotated by the transmitted power, an extension case 4 and a gear case 6. Cooling water screen 11, cooling water supply pipe 12, water pump The outboard motor body 1A consisting of 3 or the like, supporting the outboard motor mounting means 15 elastically through a mount rubber (not shown), is obtained by coupling.

The outboard motor mounting means 15 is a metal fitting for fixing the outboard motor main body 1A to the hull S. The outboard motor mounting means 15 swings the outboard motor main body 1A right and left in a plan view around a swivel shaft 16, and also includes a tilt shaft The outboard motor main body 1A including the swivel shaft 16 around the center 17 can be flipped clockwise in the drawing.

The outboard motor main body 1A further covers a lower undercase 21 and an upper engine cover 22 for accommodating the engine 3 and a periphery of the mount case 2 and an upper periphery of the extension case 4 immediately below the undercase 21. And an under cover 23.

More specifically, the under case 21 is mounted on the upper part of the mount case 2 and bolted, and the engine cover 22 is mounted on the upper part of the under case 21 so as to be detachably attached by the engagement / disengagement device 25. 21
The upper part of the under cover 23 is bolted to the lower part of the under cover. Under case 21 and engine cover 2
Reference numeral 2 serves to form an engine room (engine housing case), and the undercover 23 serves as a decorative cover. 24 is an oil pan.

FIG. 2 is a longitudinal sectional view of a vertical type multi-cylinder engine according to the present invention. The vertical multi-cylinder engine 3 is composed of, for example, a water-cooled four-cycle (four-cylinder) engine, and the axis of each of the cylinders 31... The shaft (crankshaft) 32 is oriented vertically, and the joint surface between the cylinder block 33 and the cylinder head 34, and the cylinder head 34 and the head cover 35
Is a substantially vertical surface.

The engine 3 is located behind the outboard motor 1 (rearward in the propulsion direction of the hull S shown in FIG. 1; that is, leftward in FIG. 1).
5 is arranged. 36 is a crankcase fixed to the cylinder block 33 by bolts, 37
Are pistons in the cylinders 31.

The crankshaft 32 is provided with a first pulley 32a for driving a vertically oriented camshaft 38 upward (one side of the engine 3), a second pulley 32b, and a second pulley 32 for driving an AC generator 41. A three pulley 32c is provided, a flywheel 43 with a ring gear 43a is attached to a lower portion (the other side of the engine 3), and the flywheel 43 is connected to a starter motor (not shown) by the ring gear 43a. The under case 21 is the mount case 2
Is fixed with a bolt 28 via a vibration-proof rubber 27.

In the drawing, reference numeral 22a denotes an intake port above the engine cover 22, 38a denotes a cam pulley attached to an end of the camshaft 38, 39 denotes a first belt as a timing belt, 40 denotes a second belt, and 42 denotes a third belt. A belt 44 is a belt cover. Reference numeral 44a denotes a ventilation port above the belt cover 44 for ventilating the air inside the belt cover 44 from the belt cover 44 to the outside of the engine cover 22. Reference numeral 45 denotes an oil inlet provided to be inclined to the front and outside of the crankcase 36; 46, an oil filter; 47, an intake silence box; and 48, a throttle valve device.

FIG. 3 is a plan view of the upper part of the engine according to the present invention, in which the belt cover 44 and the third pulley 32c are removed.
The inside of the second pulley 32b and the outside of the first pulley 32a are omitted as shown by broken lines in the drawing, and the cylinder block 33
And a detection member 60 for detecting the rotational position of the crankshaft 32 by the proximity sensors 51m and 51s attached to the crankcase 36 at a phase of 180 °. The two proximity sensors 51m and 51s are the same, one of which is the main and the other is the standby, but the control device (not shown) switches between the main and the standby. For convenience, the proximity sensor 51m is mainly used.
Perform at 1 m. These proximity sensors 51m and 51s and the detecting member 60 constitute a timing pulse detecting device 50.

The detecting member 60 includes a plurality of detecting pieces 61... Provided on the outer periphery and a convex portion 32 d formed on the first pulley 32 a.
(See also FIG. 5) and an elongated hole 62 for positioning with the first pulley 32a.

The detecting pieces 61... Lack one of a plurality of detecting pieces provided at equal intervals on the same circumference.
These are sequentially detected by the 1 m sensing unit 51a. In the figure, the interval between the equally-spaced detection pieces 61 is 30 °, and the interval between the detection pieces 61 in the missing portion A is 60 °.

Here, 52 is a key driven into the key groove 32e of the crankshaft 32, 53 is an arrow mark provided on the second pulley 32b, 54 is a triangular mark provided on the cylinder block 33, B1 is a proximity sensor 51m. , 51s fixing screws.

FIG. 4 is a perspective view of a detecting member according to the present invention.
2 and a plurality of arc-shaped windows 65. The detection pieces 61 are formed so as to extend around the outer periphery of the disk portion 63 at right angles to the disk portion 63. As the detection member 60, a member formed by press-forming a steel plate or the like is preferable.

FIG. 5 is a sectional view taken along the line 5-5 of FIG. 3, in which the detecting member 60 is applied to the step portion 32g while being fitted to the small diameter portion 32f of the crankshaft 32, and the first pulley 32a The second pulley 32b and the third pulley 32c were fitted, and the detection member 60, the first pulley 32a, the second pulley 32b, and the third pulley 32c were fixed to the crankshaft 32 with a washer 55 and a bolt B2 as a fastening member. Indicates that The first pulley 32a, the second pulley 32b, and the third pulley 32c are all locked by the key 52.

Here, the procedure for assembling the above-described detecting member 60 and each of the pulleys 32a, 32b, 32c will be described in order. In FIG. 5, the small diameter portion 32f of the crankshaft 32
Is fitted with the detecting member 60. The first pulley 3 is attached to the small diameter portion 32f of the crankshaft 32.
The protrusion 32d of the first pulley 32a is inserted into the long hole 62 of the detection member 60 while fitting 2a.

The second pulley 32b is fitted to the small diameter portion 32f of the crankshaft 32. In FIG. 3, by rotating the second pulley 32b,
The arrow mark 53 on the pulley 32b is
To the triangle mark 54. At this time, the second pulley 32b
At the same time, the crankshaft 32 rotates, and for example, the piston 37 (see FIG. 2) of the first cylinder of the four cylinders is located at the top dead center.

The cam pulley 38a shown in FIG. 1 is aligned with a mark (not shown) provided on the cylinder head 34 in order to correspond to the position of the top dead center. In FIG. 3, the first pulley 32a and the cam pulley 3
8a (see FIG. 1), the first belt 39 is stretched over, and the tension of the first belt 39 is adjusted.

In FIG. 5, a third pulley 32c is fitted to a small diameter portion 32f of the crankshaft 32. A bolt B2 is screw-connected to a female screw 32h (see FIG. 3) at the end of the crankshaft 32 via a washer 55.

As described above, the detecting member 60 for detecting the rotational position of the crankshaft 32 by the proximity sensor 51m.
Is detachably attached to the crankshaft 32 with the bolt B2, so that the detection member 60 can be easily replaced. By attaching a detection member having a pitch between the detection pieces 61 different from that described above, Shaft 3
Two different rotational positions can be easily detected.

The detecting member 60 is connected to the crankshaft 3.
2, the number of rotations of the detection member 60 is 2 compared to a type in which the detection member is mounted on a cam pulley, for example.
Therefore, the output signal from the proximity sensor 51m can be increased. When this output signal is the same as that of the above-mentioned type, the number of turns of the coil of the proximity sensor can be reduced, and the proximity sensor can be downsized.

The first pulley 32 directly above the detecting member 60
Since a is smaller than the cam pulley 38a (１ ／ of the diameter of the cam pulley 38a), the proximity sensors 51m and 51s can be arranged close to the side of the first pulley 32a.
However, since the diameter can be made smaller than that of the conventional type which is attached to the cam pulley 38a, the proximity sensors 51m and 51s can be attached without leaving the crankshaft 32 largely, and the engine 3 (see FIG. 2) can be prevented from being enlarged. .
Furthermore, the two proximity sensors 51m and 51s are
Since it is provided at a position opposite to 0 °, the arrangement is small and rational.

In the engine 3 (see FIG. 2), the detection member 60 is positioned relative to the first pulley 32a in the circumferential direction by fitting the long hole 62 of the detection member 60 with the projection 32d of the first pulley 32a. Then, the first pulley 32a is attached to the crankshaft 32 using the key 52, whereby the first pulley 32a is positioned relative to the crankshaft 32 in the circumferential direction.

Therefore, the detecting member 60 is connected to the first pulley 32
a and is positioned on the crankshaft 32 via a. Further, in FIG. 3, by aligning the arrow mark 53 of the second pulley 32b attached to the crankshaft 32 with the key 52 with the triangular mark 54 of the cylinder block 33, the detection piece 61 of the detection member 60 at this time, For example, the top dead center of the piston 37 of the first cylinder (see FIG. 2) can be obtained from the positional relationship between the proximity sensor 51m and the sensing unit 51a in the upper part of the figure.

The above-described timing pulse detector 5
The operation of 0 will now be described. In FIG. 3, when the detection member 60 rotates in the direction of the arrow in the figure with the rotation of the crankshaft 32, for example, the detection pieces 61 of the detection member 60 sequentially approach the sensing unit 51a of the proximity sensor 51m in the upper part of the figure. A signal is output from the proximity sensor 51m. This signal is sent to an engine control unit (not shown).

When the detecting member 60 comes to the position shown in FIG.
Assuming that the fourth detection piece is 61a for convenience and the fifth detection piece is 61b for convenience in the counterclockwise direction from the part A lacking the detection piece 61, the engine control unit determines that the detection piece 61
The timing between the time when the signal is output to the proximity sensor 51m by a and the time when the signal from the detection piece 61b is output next is the first timing.
This is sensed as the top dead center of the cylinder piston 37 (equal to 0 ° crank angle).

Also, the engine control unit is
In this figure, signals from the detection pieces 61 at equal intervals are sensed as crank angles from the top dead center every 30 ° in this figure. Thus, the ignition timing for each cylinder, the fuel injection timing for each cylinder, and the like are determined based on the top dead center position and the crank angle detected by the engine control unit.

FIG. 6 is a perspective view showing another embodiment of the detecting member according to the present invention. The same components as those in the embodiment shown in FIG. The detecting member 70 includes a plurality of detecting pieces 7 provided on the same circumference.
, A wide detecting piece 72 provided on the same circumference as the detecting pieces 71, and an annular portion 73 connecting the detecting pieces 71, 72.

The detecting pieces 72 are formed by providing detecting pieces 71 at equal intervals on the same circumference and making two of these detecting pieces 71 continuous so as to be wider, as shown in FIG. It performs the same function as the portion A lacking the detection piece 61. In this manner, in FIG.
By providing the annular portion 73 connecting the 1... 72, when the detecting member 70 rotates, the detecting pieces 71.
It is possible to suppress the deformation of the 72 due to centrifugal force.

In the embodiment of the present invention, the detecting member 6
Although 0 is one in which one of the plurality of detection pieces 61 is missing, the invention is not limited to this, and a plurality of pieces may be missing. It suffices if the dead center position can be detected. Further, the intervals between the equally-spaced detection pieces are not limited to 1/12 of the circumference as shown in FIG. 3, but may be 1/8, 1/24, and 1/36 of the circumference. Further, although the detection member is made of a steel plate, other magnetic materials may be used.

[0037]

According to the present invention, the following effects are exhibited by the above configuration. In the engine timing pulse detecting device according to the first aspect, the detection member for detecting the rotational position of the crankshaft by the proximity sensor is detachably attached to the crankshaft with a fastening member, so that the detection member can be replaced. Different rotational positions of the crankshaft can be easily detected.

In the engine timing pulse detecting device according to the second aspect, since the detecting member is provided with the annular portion connecting the plurality of detecting pieces, the detecting portion is deformed by centrifugal force by the annular portion when the detecting member rotates. Can be suppressed.

In the engine timing pulse detecting device according to the third aspect, since one of a plurality of equally-spaced detection pieces is lackingly arranged on the circumference of the detection member, the proximity sensor detects the plurality of equally-spaced detection pieces. By detecting the crank angle, the top dead center position can be detected from a portion where one of the detection pieces is missing.

[Brief description of the drawings]

FIG. 1 is a side view of an outboard motor according to the present invention.

FIG. 2 is a longitudinal sectional view of a vertical multi-cylinder engine according to the present invention.

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

FIG. 4 is a perspective view of a detection member according to the present invention.

FIG. 5 is a sectional view taken along line 5-5 in FIG. 3;

FIG. 6 is a perspective view showing another embodiment of the detection member according to the present invention.

[Explanation of symbols]

3 ... Engine, 32 ... Crankshaft (crankshaft), 50 ... Timing pulse detector, 51m, 51
s: proximity sensor, 60, 70: detection member, 61, 71,
72: detecting piece; 73: annular portion; B2: fastening member (bolt).

Claims (3)

[Claims] 1. An engine timing pulse detecting device, wherein a detecting member for detecting a rotational position of a crankshaft by a proximity sensor is detachably attached to the crankshaft by a fastening member. 2. The timing pulse detecting device for an engine according to claim 1, wherein an annular portion connecting the plurality of detecting pieces is provided on the detecting member. 3. The timing pulse detecting device for an engine according to claim 1, wherein one of a plurality of equally-spaced detecting pieces is missing on the circumference of the detecting member. .