JPS6047813A - Engine generator oil level detection device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an oil level detection device for an engine generator, in particular, a ring-shaped float that moves up and down depending on the oil level, a first magnet embedded in the inner peripheral surface of the float,
A detector consisting of reed switches placed above and below the center of the float is installed in the oil reservoir at the bottom of the engine body, and a flywheel fixed to one end of the crankshaft has an ignition switch. The present invention relates to an oil level detection device for a generator, in which two magnets are fixedly installed, and a rotor around which a field winding is wound is fixed to the other end of the crankshaft.

Conventionally, in such oil level detection devices, the leakage magnetic flux of the second magnet had an adverse effect on the detector because the magnetic path of the leakage magnetic flux was formed by a steel plate cover for covering the cooling fan provided on the flywheel. However, there was no awareness that actual damage would occur, and it was not considered a problem. On the contrary, if the cover is made of synthetic resin or made thinner in order to reduce the weight of the engine, the leakage magnetic flux of the second magnet increases, and depending on the relative position of the detector and the flywheel, the leakage magnetic flux of the second magnet increases. This may cause the detector to malfunction.

It is also susceptible to the magnetic force of the generator's rotor, and the magnetic force of the second magnet and the rotor act on the reed switch of the detector, causing the detector to fail to respond to up and down changes in the oil level. There was a risk that it would operate '1'.

The present invention was made in view of such circumstances.
r&s, an engine power generator in which the magnetic forces of the second magnet and rotor cancel each other out at the position of the reed switch, suppressing the influence of these magnetic forces on the detector and ensuring reliable operation of the detector. The purpose of the present invention is to provide an oil level detection device similar to the above.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. First, in FIG. The shaft 4 is rotatably supported by a crankcase 7 via bearings 5 and 6, and a flywheel 9 is fixed to one end of the crankshaft 4 together with a cooling fan 8. On the other hand, the other end of the crankshaft 4 protruding from the crankshafts 7, 7 is inserted into a generator casing 10 that is integrated with the crankshaft. are connected concentrically, a rotor 12 is fixed to the rotor shaft 11, and a field winding 13 is wound around the rotor 12.

Further, a stator 14 is fixed to the casing 10 surrounding the rotor 12, and the stator 14 has a capacitor excitation winding connected to a phase advance capacitor (not shown) to form a closed circuit. The wire 15 and the load winding 16, which is connected to a load (not shown) and forms a closed circuit, are wound as an unbalanced two-phase winding so that they have a phase AI difference of 90 degrees in electrical angle. .

Furthermore, a cooling fan 17 is fixed to the end of the rotor shaft 11 on the opposite side from the crankshaft 4.

An oil reservoir 1B is formed at the bottom of the engine body 1, that is, at the bottom of the crankcase 7. In order to detect the oil level L in this oil reservoir 18, a ring-shaped float 19, a magnet 20, and a A detector 22 consisting of a reed switch 21 is disposed below the crankshaft 4 in the oil reservoir 1B. On the other hand, a magnet 23 is embedded at a position along the circumferential direction of the flywheel 9, and is used to generate sparks in the spark plug 24.
An ignition device unit 25 operated by the magnetic force of the second magnet 23 is attached to the engine body 1.

In FIG. 2, the casing 26 of the detector 22 is basically formed into a cylindrical shape with an open bottom.
A pair of attachment arms 27 and 28 integrally formed on the casing 26 are attached to the crankcase 7 (FU in FIG. 1) below the crankshaft 4 (see FIG. 1).

A support cylinder 29 is suspended from the upper part of the center of the casing 26, and a reet switch 21 extending vertically is provided inside the support cylinder 29, and a pair of lead wires are respectively connected to both contacts of the reed switch 21. 30°31id,
A guide tube 32 extending laterally from the top of the casing 26
It is extracted through the process. The open end of the casing 26 has a second
As shown in Fig. A, a retaining member 34 is press-fitted which is basically cross-shaped and has a circular raised portion 33 raised upward on the side of the support tube 29, and a stopper is provided at the upper end of the raised portion 33. A protrusion 35 is provided to protrude. Inside the casing 26,
A ring-shaped float 19 that concentrically surrounds the support tube 29 is housed, and this flow 119H1 is removed from the first member 34.
The float 19 moves up and down depending on the level of oil flowing into the casing 26, and is prevented from falling off from the casing 26 by a stopper 34. Also, on the inner peripheral surface of the float 19, there is a ring-shaped first red sea bream.
A magnet 20 is buried therein, and a light switch 21 is activated in response to the vertical movement of the first magnet 20, which is integrated with the float 19.
opens and closes.

That is, in FIG. 3, as the oil level L increases, as shown in FIG.・A magnetic path via the reed switch 21 of the reed switch 20 is not formed, and the reed switch 2
1 remains open. Further, as shown in FIG. 3(A), when the float 19 and the first magnet 20 come to positions corresponding to the open/close positions of the reed switch 21, the reed switch 21 is closed by the magnetic force of the first magnet 20. A magnetic path is formed via the reed switch 21.

In this way, the reed switch 21 opens and closes, but in order to prevent the float 19 and the first magnet 20 from being located below the open/close position of the reed switch 21 and opening the reed switch 21, the float 19
is prevented from falling below the set position by a removal preventing member 34.

A protrusion 36 is provided on the upper surface of the float 19,
This protrusion 36 and the stopper protrusion 35 of the removal prevention member 34
As a result, the upper and lower surfaces of the float 19 do not come into close contact with the upper part of the casing 26 and the pull-out stopper member 34, and malfunction of the float 19 due to the close contact is prevented.

In FIG. 4, according to the present invention, the angular position of the magnetic poles of the rotor 12 and the attachment position of the second magnet 23 to the flywheel 9 are such that the magnetic force of the rotor 12 and the second magnet 23 is at the position of the reed switch 21. It is set so that it acts in the direction of canceling it out. For example, the first magnet 20
When the float 11 is arranged so that the lower side is the N pole and the upper side is the 5 pole, the second magnet 23 has the N pole on the outer side along the radial direction of the flywheel 9 and the S pole on the inner side. It is immediately installed on the flywheel 9 so that Further, the rotor 12 is attached to the crankshaft 4 with its angular position adjusted so that when the second magnet 23 is at the lowest position, its S pole is at the lowest position. At this time, a mark indicating the direction in which the first magnet 20 is buried is formed on the float 19 so as not to make a mistake in the arrangement 1σ direction of the float 19. In this embodiment, the mark is a protrusion 3.
6 is used.

Next, to explain the operation of this embodiment, the engine 7
During driving, when the second magnet 23 of the flywheel 9, which rotates integrally with the crankshaft 4, comes to the lower position as shown in FIG. 4, the S pole of the rotor 12 is located lower. . Therefore, the magnetic force from the second magnet 23 acts on the reed switch 21 from below to the top, whereas the magnetic force from the rotor 12 acts on the reed switch 21 from above to the bottom. is the effect 1-
Ru. Therefore, as much as possible, the second magnet 23 and the rotor 12 act to kill each other at l) -1, I+] at the position of the switch 21, and the influence of j' on the reed switch 21 is ] It becomes possible to perform reliable operation according to the vertical movement of the magnet 20.

Here, the test results using the test apparatus configured as in the above embodiment are as shown in Fig. 5. In FIG. 5, the curve A /3 indicates the relative position between the second Magui Soto 23 and the magnet 4fi of the rotor 12 as shown in FIG. 6(a).
Glue switch 2 when shown in (h)
1 indicates the influence of magnetic force on 1-. It is clear in Figure 5 ": Sea urchin, influence on magnetic force on reet switch 21", 11
It can be suppressed to a low range of ~-24 Gauss. On the other hand, the second magnet, the outer magnetic pole of the hole 23, for example, N
When the poles and the rotor 12 ON insertion I are set at the same angular position on the crankshaft 4, the second magnet 23 and the rotor 1
2 and 41191st position 11"71' is shown in Figure 6 (C),
1) when (rf) - model name to switch 21)
(The direction of play is shown as the curve 71υ(-', I) in FIG. The magnetic force on the reed switch 21 is clearly smaller than the curves A and Bld when the magnetic pole position of the rotor 12 is set, and the curves C and D when the magnetic pole position of the rotor 12 is set in the opposite direction.
When setting the mechanical positional relationship between the magnetic poles of the second magnetic pole 23 and the magnetic poles of the rotor 12, the shape of the magnetic material part such as the crankshaft nib should be particularly carefully considered. Alternatively, it may be necessary to take into account that the field current of the generator changes depending on the load condition and the magnetic force and phase change slightly, but normally unless a short-circuit magnetic path by a magnetic material is installed nearby, The position will not change due to the thickness.

Further, this optimum relative position can be easily set based on the actually measured take during actual division operation.

Therefore, according to the present invention, malfunction of the detector 22 due to leakage magnetic flux from the rotor 12 and the second magnet 23 can be reliably prevented.

As described above, according to the present invention, the angular position of the magnetic poles of the rotor, the fixing position of the second magnet to the fly 7j quill, and the 1θ forces of the rotor and the second magnet cancel each other out at the position of the reed switch. Since the magnet is set to be used in the direction 1', the magnetic force exerted on the detector from the rotor and the second magnet is suppressed, and malfunction of the detector due to these external forces is prevented as much as possible.

[Brief explanation of drawings]

1 to 4 show one embodiment of the present invention, in which FIG. 1 is an overall vertical sectional side view, an enlarged vertical sectional view of the 21st detection 4), and FIG. 2A is a bottom view of the removal prevention member. Figure, Figure 3(a),
(h) is a diagram to explain the operation of the detector (Fig. 4 is a schematic diagram to show the magnetic pole arrangement of the rotor, detector, and second magnet, and Fig. 5 is a graph showing the experimental results. , Figure 6 ((1), (1)), (C), <
(1) is a diagram showing the relative positions of the rotor, the first magnet, and the second magnet corresponding to the curves A, B, C, J)K in Fig. 5. 1. Engine body, 4.・Crankshaft, 9... Flywheel, 12... Rotor, 13... Field winding, 1
8... Oil reservoir, 19... Float, 20... First magnet, 21... Reed switch, 22... Detector, 23... Second magnet Patent applicant Honda Motor Co., Ltd. Figure 1 Figure 3 Figures (a) and b, Figure 4, Figure 5, 01 76- Figure 6

Claims (1)

[Claims] A ring-shaped float that moves up and down depending on the oil level,
A detector consisting of a first magnet embedded in the inner peripheral surface of the float and reed switches arranged above and below the center of the float is disposed in the oil reservoir at the bottom of the engine body, and is located in the oil reservoir of the crankshaft. A second magnet for ignition is fixed to the flywheel fixed to one end, and an engine generator is fixed to the other end of the crankshaft. In the oil level detection device, the angular position of the magnetic poles of the rotor and the fixed position of the second magnet to the flywheel act in a direction such that the magnetic forces of the rotor and the second magnet cancel each other out at the position of the reed switch. An oil level detection device for an engine generator, characterized in that it is set as follows.