JPH0510543Y2 - - Google Patents

Description

[Detailed description of the invention] A. Purpose of the invention (1) Industrial application field The present invention is a signal generator used in an engine fuel injection control system, etc., particularly a housing; a drive shaft rotatably supported by a bearing holder made of a magnetic material; first and second pulse generators respectively disposed on both sides of the bearing holder;
The first and second pulse generators each include a stator and a signal rotor that is fitted onto the drive shaft and has a protrusion on its outer peripheral surface, and the stator is spaced apart from the protrusion of the signal rotor by a predetermined distance. It has an opposing iron core, a coil wound around the iron core, and a magnet connected to the iron core, the stator of the first pulse generator is fixed to the bearing holder, and the stator of the second pulse generator is fixed to the bearing holder. The present invention relates to an improvement in which the stator is fixed to the housing.

(2) Prior Art The pulse generator generates a pulse-like voltage in a coil based on changes in magnetic flux caused by the projections of a signal rotor facing an iron core and being misaligned.

Therefore, the signal transmission timing relationship between both pulse generators is determined by the timing at which the protrusion and the iron core face each other in the first pulse generator and the timing at which the protrusion and the iron core face each other in the second pulse generator.

Conventionally, one signal rotor is fixed to the drive shaft, and the other signal rotor is fixed to the housing with its protrusion having a predetermined phase difference or the same phase as the protrusion of the one signal rotor. The iron core of the second pulse generator is opposed to the corresponding protrusion of the signal rotor,
In this state, the iron core of the first pulse generator is screwed to the bearing holder with a predetermined phase difference with respect to the corresponding protrusion of the signal rotor, or with the iron core facing the protrusion. .

In this case, the screw insertion hole of the stator is formed larger than the outer diameter of the screw so that the position of the stator can be adjusted.

(3) Problems to be Solved by the Invention However, since the conventional device is not equipped with a guide means for adjusting the position of the stator in the first pulse generator, it is troublesome to position the iron core, and the positioning work is difficult. There is a problem that it cannot be done efficiently.

SUMMARY OF THE INVENTION An object of the present invention is to provide the signal generator that can solve the above problems.

B. Structure of the invention (1) Means for solving the problems In order to achieve the above object, the present invention provides an arcuate stepped portion having an arcuate rising surface centered on the axis of the drive shaft on the inner circumferential surface of the housing. A bearing holder is placed on the arcuate stepped portion so that the holder can rotate about the axis by sliding contact between the arcuate sliding contact portion formed on the holder and the rising surface, and the bearing holder The screw insertion hole is formed as a long hole extending along the arcuate sliding contact portion.

(2) Effect With the above configuration, the iron core of the first pulse generator can be easily positioned with respect to the corresponding protrusion of the signal rotor by rotating the bearing holder while slidingly contacting the rising surface of the stepped portion. I can do it. Further, the bearing holder is stably supported by the stepped portion and the drive shaft, and after positioning the core, it is extremely easy to fix the core and therefore the bearing holder.

Thereby, the positioning work of the iron core can be performed efficiently.

(3) Embodiment In FIGS. 1 and 2, a housing 1 of a power distributor D as a signal generating device has an aluminum alloy housing body 2 having a cylindrical shape and having an opening at one end.
and a synthetic resin cap 5 which is attached to the opening via a sealing member 3 with a screw 4 so as to be openable and closable.
It becomes more.

Inside the housing 1, there are a first pulse generator P 1 that generates a crank position signal corresponding to the crank position of the engine, a second pulse generator P ₂ that generates an engine rotation speed signal, a closed magnetic path type ignition coil I _, and a spark plug. A power distribution mechanism Dm (not shown) is provided.

A drive shaft 7 for driving the first and second pulse generators P 1 _and P ₂ is attached to the end wall 2 a of the housing body 2 and a bearing holder 6 made of a magnetic material screwed to the opening of the housing body 2 . It is rotatably supported via bearings 8 (only one of which is shown).

An Oldham joint 9 is attached to the protruding end of the drive shaft 7 from the housing body 2, and the Oldham joint 9
meshes with an Oldham joint attached to a rotating shaft such as a camshaft driven by an engine (not shown). As a result, the drive shaft 7 is driven by the engine.

As clearly shown in FIGS. 2 and 3, the bearing holder 6 is a flat plate having an occluded circular shape in plan view, and the bearing 8 is press-fitted into a hole 10 at the center thereof.

An arcuate step 11 having an arcuate rising surface 12 centered on the axis of the drive shaft 7 is formed on the inner circumferential surface of the housing body 2. The bearing holder 6 is attached to the step 11. The drive shaft 7 is mounted so as to be rotatable around the axis of the drive shaft 7 by sliding contact between the arcuate sliding contact portion 6a formed on the outer peripheral edge of the drive shaft 7 and the rising surface 12.

A plurality of (three in the illustrated example) screw insertion holes 13 are bored in the bearing holder 6 near its outer periphery at intervals in the circumferential direction. A long hole is formed extending along the portion 6a, and a screw 14 passing through the screw insertion hole 13 is screwed into a female screw hole 15 of the stepped portion 11.

A first pulse generator _P1 is placed on one side of the bearing holder 6, and a second pulse generator P1 is placed on the other side.
P ₂ are arranged respectively.

As shown in Figures 1-3, the first pulse generator _P1 is configured as described below.

That is, the signal rotor 17 ₁ having four projections 16 ₁ is fitted onto the outer peripheral surface of the drive shaft 7 by press fitting.

An L-shaped support fitting 18 ₁ made of a magnetic material is disposed on one surface of the bearing holder 6 . The support fitting 18 ₁ is
A mounting plate 20 ₁ fixed to the bearing holder 6 by a pair of screws 19 ₁ and a support plate 21 ₁ rising from the side edge of the mounting plate 20 ₁ on the housing body 2 side.
It becomes more.

A coil slip-out prevention plate 2 made of a non-magnetic material is provided on the support plate 21 ₁ on the surface facing the signal rotor 17 ₁ .
2 ₁ are overlapped, and a magnet 23 is placed on the surface of the support plate 21 ₁ facing the housing body 2.
₁ and the proximal end of the plate core 24 ₁ are superposed in this order, and these four members 21 ₁ , 22 ₁ , 23 ₁ . 24 ₁
are fixed together by a pair of screws 25 ₁ that pass through the retaining plate 22 ₁ , the support plate 21 ₁ and the magnet 23 ₁ and are screwed onto the base end of the iron core 24 ₁ .

The iron core 24 ₁ includes a mounting plate 26 ₁ that has the base end portion and is bent along the inner surface of the housing body 2.
and a coil winding plate 27 ₁ connected to the mounting plate 26 ₁ so as to be substantially perpendicular thereto, and the tip end e ₁ of the coil winding plate 27 ₁ is connected to each protrusion 16 of the signal rotor 17 ₁ . It is now possible to face ₁ .

The insertion hole 30 ₁ of the bobbin 29 ₁ in the pick-up coil 28 ₁ as a coil is fitted into the coil winding plate 27 ₁ of the iron core 24 ₁ , and thereby the pick-up coil 28 ₁ is wound on the coil winding plate 27 _1. .

An insertion hole 31 is formed at the tip of the retaining plate 22 ₁ , the tip e ₁ of the coil winding plate 27 ₁ passes through the insertion hole 31 , and the pick-up coil 28 ₁ is connected to the mounting plate 26 ₁ and the retaining plate 22 . It is sandwiched between ₁ . In this sandwiched state, the proximal end of the retaining plate 22 ₁ is fixed to the support plate 21 ₁ by the screw 25 ₁ as described above, so that the pick-up coil 28 ₁ is prevented from being withdrawn, and the iron core 24 ₁ , the magnet 23 ₁ and Retaining plate 22
₁ binding is performed in the same process. 32 ₁ and 33 ₁ are lead wires connected to the winding start terminal and winding end terminal of the pickup coil 28 ₁ , respectively.

The support fitting 18 ₁ , the retaining plate 22 ₁ , the magnet 23 ₁ the iron core 24 ₁ and the pick-up coil 28
₁ constitutes the stator 34 ₁ .

As clearly shown in FIGS. 1 and 4, the second pulse generator _P2 has the same configuration as the first pulse generator P1, so the second pulse generator _P2 has the same configuration as the first pulse generator P1.
Components that are the same as P ₁ are given the same major symbol and minor symbol “ ₂ ”.
is attached. However, the signal rotor 17 ₂ has 24 protrusions 16 ₂ on its outer peripheral surface, and the mounting plate 20 ₂ of the support fitting 18 ₂ is fixed to the pair of supports 35 of the housing body 2 by a pair of screws 19 ₂ . .

The iron core 37 of the ignition coil I is attached to a pair of mounting portions 3 exposed on the outer surface of the peripheral wall of the synthetic resin coil case 36.
7a, and the mounting portions 37a are fixed by a plurality of screws 39 to a pair of pillars 38 erected in the opening of the housing body 2, whereby the ignition coil I is mounted to the housing body 2. Inside the coil case 36, primary and secondary coils 40 and 41 are wound around the winding core 37b of the iron core 37, both inside and outside.
are stored in the synthetic resin R by a potting process.

At the opening of the coil case 36, a high voltage terminal 42 ₁ is connected to the output terminal of the secondary coil 41.
A connecting tube 43 made of synthetic resin having an opening is located outside the coil case 36 and is buried in the synthetic resin R. 42 ₂ is a low voltage terminal connected to the input side terminal of the primary coil 40 in the ignition coil I, etc.

The power distribution rotor 44 of the power distribution mechanism Dm includes a synthetic resin body 46 that is fitted onto the drive shaft 7 and fixed by a screw 45, and a power distribution electrode 47 embedded and held in the synthetic resin body 46. The distal end of the power distribution electrode 47 protruding from the synthetic resin body 46 is configured such that one end protrudes into the cap 5 and can face a side electrode 48 embedded and held in the cap 5. A plurality of side electrodes 48 are provided in accordance with the number of cylinders of the engine, and these are respectively connected to a plurality of spark plugs (not shown). The base end of the power distribution electrode 47 is exposed at the center of the end surface of the synthetic resin body 46, and a carbon center electrode 49 provided on the cap 5 is in sliding contact with the base end.

The center electrode 49 is held in a conductive tube 50 embedded in the cap 5 via a conductive spring 51, and one end of a conductive rod 52 buried in the cap 5 is connected to the conductive tube 50. A conductive tube 53 formed at the other end of the conductive rod 52 is embedded in a cylindrical portion 54 protruding from the inner surface of the top wall of the cap 5.
A conductive spring 55 is placed inside the conductive cylinder 53.
A conductive electron 56 having the same configuration as the center electrode 49 is held through the center electrode 49 . As a result, when the cap 5 is placed over the opening of the housing body 2, the cylindrical portion 54 is fitted into the connecting tube 43 of the ignition coil I, and the center electrode 49
The conductor 56 is connected to the power distribution electrode 47 and the high voltage terminal 42 ₁ respectively, and the elastic force of the springs 51 and 55 allows the center electrode 49 to connect to the power distribution electrode 47 and the conductor 56 to the high voltage terminal. 42
1 and are reliably maintained by being biased toward ₁ .

Next, in the first pulse generator _P1 ,
The positioning work of the iron core 24 ₁ with respect to the signal rotor 17 ₁ will be explained.

The signal rotor 17 ₁ of the first pulse generator P ₁ has a protrusion 16 ₂ of the signal rotor 17 ₂ of the second pulse generator P ₂ between adjacent protrusions 16 ₁ .
are positioned relative to the signal rotor 17 ₂ of the second pulse generator P ₂ such that five pulse generators are arranged.

First, the drive shaft 7 is fixed with the tip end e ₂ of the iron core 24 ₂ of the second pulse generator P ₂ facing one projection 16 ₂ of the signal rotor 17 ₂ corresponding thereto.

Then, with each screw 14 of the bearing holder 6 loosened, the outer peripheral surface of the bearing holder 6 is rotated while slidingly contacting the rising surface 12 of the stepped portion 11, and the tip of the iron core 24 ₁ in the first pulse generator P ₁ is rotated. The iron core 24 ₁ is positioned by making the portion e ₁ correspond to the corresponding projection 16 ₁ of the signal rotor 17 ₁ . In this case, rotation of the bearing holder 6 is allowed because the screw insertion hole 13 is a long hole. Also, the bearing holder 6
is guided by the rising surface 12, so the iron core 2
4. Positioning of ₁ is easily performed.

Next, each screw 14 is tightened to fix the bearing holder 6 to the stepped portion 11. In this case, the bearing holder 6 is stably supported by the stepped portion 11 and the drive shaft 7, and it is extremely easy to fix the iron core 24 ₁ and therefore the bearing holder 6 after positioning the iron core 24 ₁ .

Thereby, the positioning work of the iron core 24 ₁ can be performed efficiently.

Next, the first and second pulse generators P ₁ and P ₂
The signal generation effect will be explained.

When the engine is operated and the drive shaft 7 is rotated, the signal rotors 17 ₁ and 17 ₂ of the first and second pulse generators P ₁ and P ₂ are rotated.

In the first pulse generator P ₁ , when one protrusion 16 _{1 of} the signal rotor 17 ₁ faces the tip e 1 of the iron core 24 ₁ , the magnet 23 ₁ , the iron core 24 ₁ , the signal rotor 17 ₁ , the drive shaft 7, A magnetic path is formed between the bearing holder 6, the support fitting 18 ₁ and the magnet 23 ₁ , and then the projection 16 ₁ and the tip
Since the magnetic flux in the magnetic path changes due to the discrepancy between e and e ₁ , a pulse-like voltage, and therefore a crank position signal, is generated in the pick-up coil 28 ₁ .
This crank position signal is transmitted to the signal rotor 17 ₁
has four protrusions ₁₆₁ , so one of the drive shafts 7
Four signals are transmitted every rotation.

On the other hand, also in the second pulse generator _P2 ,
One protrusion 16 ₂ of the signal rotor 17 ₂ is the iron core 2
When facing the tip e ₂ of 4 ₂ , the magnet 23 ₂ ,
iron core 24 ₂ , signal rotor 17 ₂ , drive shaft 7 , support fitting 18 ₂ (the intermediate curved part of the mounting plate 20 ₂ in this support fitting 18 ₂ is connected to the drive shaft 7 as shown in FIG.
) and magnet 2
A magnetic path is formed between _the pick-up coil 28 ₂ and the magnetic flux of the magnetic path changes due to the difference between the protrusion 16 ₂ and the tip e ₂ . An engine rotation speed signal is generated. Since the signal rotor 17 ₂ has 24 protrusions 16 ₂ , 24 engine rotational speed signals are transmitted for each revolution of the drive shaft 7 .

In this case, since the iron core 24 ₁ of the first pulse generator P ₁ is correctly positioned with respect to the corresponding signal rotor 17 ₁ , the timing of the transmission of the crank position signal by the first pulse generator P ₁ and the second pulse The transmission timing of the engine rotation speed signal of generator P ₂ perfectly matches.

The crank position signal, engine rotation speed signal, and signals from each sensor (air flow meter, etc.) are input to an engine control computer (not shown), where the ignition timing and the time for energizing the primary coil 40 of the ignition coil I are determined. Ru.

In response to an ignition signal from the engine control computer, an igniter unit (not shown) is operated to cut off the primary current flowing through the primary coil 40 of the ignition coil I.
A high voltage is generated at the high voltage terminal 42 ₁ ,
It is distributed to the corresponding side electrodes 48 via the conductive electron 56, the conductive rod 52, the center electrode 49 and the power distribution electrode 47, and causes the spark plug to spark.

C. Effect of the invention According to the invention, the bearing holder is rotated while slidingly contacting the rising surface of the arcuate step provided in the housing, and the iron core of the first pulse generator is moved against the corresponding protrusion of the signal rotor. Can be easily positioned. Further, the bearing holder is stably supported by the stepped portion and the drive shaft, and after positioning the core, it is extremely easy to fix the core and therefore the bearing holder.

Thereby, the positioning work of the iron core can be performed efficiently.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a longitudinal sectional front view of the whole, Fig. 2 is a sectional view taken along the line of Fig. 1,
FIG. 3 is a perspective view of the main parts of the first pulse generator,
FIG. 4 is a sectional view taken along the line of FIG. 1. D...Distributor as a signal generator, P ₁ , P ₂
...First and second pulse generators, 1... Housing, 6... Bearing holder, 6a... Arc-shaped sliding contact portion, 7... Drive shaft, 11... Step portion, 12... Rising surface, 13... ...Screw insertion hole, 14...Screw, 16
₁ , 16 ₂ ... Protrusion, 17 ₁ , 17 ₂ ... Signal rotor, 23 ₁ , 23 ₂ ... Magnet, 24 ₁ , 2
4 ₂ ... iron core, 28 ₁ , 28 ₂ ... pick-up coil as a coil, 34 ₁ , 34 ₂ ... stator.

Claims (1)

[Scope of utility model registration request] a housing 1 ; a drive shaft 7 rotatably supported by the housing 1 and a bearing holder 6 made of a magnetic material screwed to the housing 1 ; The first and second pulse generators P ₁ and P ₂ respectively include stators _{34 1 and 34 2 and} the drive shaft 7.
The stators _{34 1} , 34 ₂ are fitted into the signal rotors 17 ₁ , 17 ₂ and have protrusions 16 ₁ , 16 ₂ on their outer peripheral surfaces.
Iron cores 24 _{1 ,} 24 ₂ facing the protrusions 16 ₁ , 16 ₂ of 7 ₂ at a predetermined interval;
4 ₂ and magnets 23 ₁ and 23 ₁ connected to the iron cores 24 ₁ and 24 _{2 respectively} .
23 ₂ and fixing the stator 34 ₁ of the first pulse generator P ₁ to the bearing holder 6;
Further, in the signal generating device in which the stator 34 ₂ of the second pulse generator P ₂ is fixed to the housing 1, on the inner peripheral surface of the housing 1,
An arc-shaped step 11 having an arc-shaped rising surface 12 centered on the axis of the drive shaft 7 is provided, and this step 11
The bearing holder 6 is placed so that the holder 6 can rotate around the axis by sliding contact between the arcuate sliding contact portion 6a formed on the holder 6 and the rising surface 12, and the bearing holder 6 A signal generating device characterized in that the screw insertion hole 13 is formed as a long hole extending along the arcuate sliding contact portion 6a.