JPS6220410B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal rotor fixing device in a signal generator equipped with a signal rotor that rotates together with a rotating shaft.

Conventionally, when fixing a signal rotor to a rotating shaft, the signal rotor is provided with a notched circular shaft hole and a notch opened in the notched part of the shaft hole, and the notched circular shaft of the rotating shaft is attached to the shaft hole. The spring pin is driven into the notch so that it springs into engagement with the signal rotor and the rotating shaft. Since the signal rotor is set to act in the direction of the center line of the spring pin, due to the clearance between the shaft hole and the shaft, the signal rotor swings in either direction using the contact part of the spring pin against the shaft as a fulcrum. However, as a result, there is a problem that variations occur in the timing of signal generation.

In view of the above, it is an object of the present invention to eliminate the above-mentioned problems by fixing the signal rotor to the rotating shaft so that it cannot rotate, by extremely simple means.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, a housing 1 includes a housing body 2 and a cap 3 for closing an opening thereof. A bearing cylinder part 4 is provided protruding from the bottom of the housing body 2, and an intermediate part of a rotating shaft 6 is rotatably supported by the bearing cylinder part 4 via a bearing 5. A coupling ring 8 having an engaging claw 7 is fixed to the outer end of the rotary shaft 6 protruding from the housing 1, and a drive shaft 9 interlocked with a camshaft of an internal combustion engine is connected to the coupling ring 8. 10 is the rotating shaft 6
A retaining ring fitted onto the shaft contacts the inner ring of the bearing 5 to prevent the rotating shaft 6 from slipping outward. Reference numeral 11 denotes a small screw screwed into the end surface of the bearing cylinder, which prevents the bearing 5 from coming off through a washer 12 that abuts the outer ring of the bearing 5.

Inside the housing 1, a magnet-powered first
Second signal generators G ₁ and G ₂ are arranged in two stages, upper and lower. The first signal generator G ₁ transmits, for example, a fuel injection signal or an ignition signal for the engine, and the second signal generator G ₂ transmits, for example, a signal for detecting the rotation speed of the internal combustion engine or a signal for detecting the crank position, and these G ₁ and G ₂ are connected to the first signal rotor 1.
3 ₁ , a first stator 14 ₁ , a second signal rotor 13 ₂ , and a second stator 14 ₂ , respectively.

Each of the signal rotors 13 ₁ and 13 ₂ is fixed to the rotating shaft 6 so as not to come off as described below.

The first signal rotor 13 ₁ has an annular shape as shown in FIG. 4, and has four protrusions 1 on its outer peripheral surface.
5 ₁ , and the inner circumferential surface thereof is formed into a circular shaft hole 16 ₁ . In addition, the ring part has a flat missing circular part 1 of the shaft hole ₁₆₁ .
A notch 18 ₁ opening at 7 ₁ is formed. The perpendicular bisector at the opening of the notch ₁₈₁ is
It passes through the center of the shaft hole ₁₆₁ and is offset by _a1 to one side of a perpendicular to the omitted circular portion ₁₇₁ .

As clearly shown in FIG. 3, the rotating shaft 6 has second and first circular shaft portions 6 ₂ , 6 ₁ in the axial direction from its tip.
The shaft hole 16 ₁ of the first signal rotor 13 ₁ is fitted into the first circular shaft portion 6 ₁ . By driving the spring pin 19 ₁ into the notch 18 ₁ , the pin 19 ₁ resiliently engages with the notch 18 ₁ and the cutout circular portion 20 ₁ of the shaft portion 6 ₁ , thereby increasing the bias amount a ₁ Due to spring pin 19 ₁
Since the elastic force applied to the shaft portion ₆₁ is shifted to one side from the center line of the rotating shaft 6, the notch ₁₈ of the circular portion 171 in the first signal rotor ₁₃₁
The edge farthest from ₁ is the first notched circular shaft portion 6 and the notched circular portion 20 of ₁
The _first signal rotor ₁₃₁ is fixed to the rotating shaft 6 so that it cannot rotate.

The second signal rotor ₁₃₂ has an annular shape and one protrusion ₁₅₂ on its outer peripheral surface, and has a circular shaft hole ₁₆₂ and a notch having the same shape as the shaft hole ₁₆₁ of the first signal rotor ₁₃₁ . 18 ₂ is formed, and the second notched circular shaft portion 6 is formed in the same working procedure as above.
₂ , it is fixed in a non-rotatable manner. 17 ₂ is the missing circular part of the shaft hole 16 ₂ , 19 ₂ is the spring pin, 20
₂ indicates the missing circular portion of the second partially circular shaft portion ₆₂ , and a ₂ indicates the same amount of deviation as described above.

The first stator 14 ₁ of the first signal generator G ₁ is
Magnet plates 2 are sequentially stacked on the magnetic path forming plate 22 placed on the support base 21 ₁ of the housing body 2
3 and a pair of coil holding plates 24,
2 to 24 are fixed to the support base ₂₁₁ by mounting screws 25. The outer circumferential coil 28 of the iron core 2 installed between the bent portions 26 of both coil holding plates 24 is fitted, and the protruding end of the iron core 27 is spaced from each protrusion 15 ₁ of the first signal rotor 13 ₁ by a predetermined gap. It is possible to face each other with

The second stator 14 ₂ of the second signal generator G ₂ is
Constructed on the support base 21 ₂ of the housing main body 2,
Since its constituent elements are the same as those of the first stator ₁₄₁ , the same elements are given the same reference numerals.

Each magnetic path forming plate 22 has a through hole 30 into which the rotating shaft 6 is loosely inserted, so that the rotating shaft 6 is brought close to each magnetic path forming plate 22 and the magnetic path of both signal generators G ₁ and G ₂ is configured. Become an element.

Next, the operation of this embodiment will be explained.

When the engine is operated and the rotary shaft 6 is rotated via the drive shaft 9, the first signal generator _G1
Each protrusion 15 ₁ of the signal rotor 13 ₁ faces the iron core 27 one after another, and the magnet plate 23 → the magnetic path forming plate 22
→ Rotating shaft 6 → First signal rotor 13 ₁ → Iron core 2
A magnetic flux is formed between 7→coil holding plate 24→magnetic plate 23, and then the magnetic flux changes as the protrusion ₁₅₁ is misaligned with the iron core 27, so the coil 28 receives a pulse-like pulse corresponding to each cylinder of the engine. Voltage is generated. Therefore, a fuel injection device, an ignition device, etc. can be operated using this voltage signal.

On the other hand, in the second signal generator G ₂ , the protrusion 15 ₂ of the second signal rotor 13 ₂ faces the iron core 27, so that the magnetic plate 23→magnetic path forming plate 22→rotating shaft 6
→Second signal rotor ₁₃₂ →Iron core 27→Coil holding plate 24→Magnetic flux is formed between magnet plate 23, and then when the protrusion 152 is misaligned with the iron core ₂₇ , the magnetic flux changes, and the coil 28 is pulsed. voltage is generated, and the number of times it occurs is 1 on the engine camshaft.
Since this occurs once at a predetermined rotational position per rotation, the engine rotational speed or crank position can be determined by detecting this voltage signal.

As described above, according to the present invention, the notch of the signal rotor is provided at a position where the elastic force of the spring pin against the rotating shaft acts in a direction shifted from the center line of the rotating shaft. By driving a spring pin into the hole, the missing circular part in the shaft hole can be
By aligning the edge farthest from the notch with the edge of the notched circular portion of the shaft, the signal rotor can be fixed to the rotating shaft so that it cannot rotate. By fixing it, it is possible to prevent variations in signal generation timing.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a longitudinal sectional front view of the signal generator, Fig. 2 is a plan view of the housing body, and Fig. 3 is an exploded perspective view showing the relationship between the signal rotor and the rotation axis. Figure, Figure 4 is Figure 1-
A line sectional view, FIG. 5 is a view taken in the direction of the arrow in FIG. G ₁ , G ₂ ... First and second signal generators, 6 ... Rotating shaft, 6 ₁ , 6 ₂ ... First and second circular shaft parts, 1
3 ₁ , 13 ₂ ...first and second signal rotors, 1
6 ₁ , 16 ₂ ...first and second circular shaft holes, 17
₁ , 17 ₂ ... Notched circular portion, 18 ₁ , 18 ₂ ... Notch, 19 ₁ , 19 ₂ ... Spring pin.

Claims (1)

[Claims] 1 A signal rotor is provided with a circular shaft hole and a notch opened in the circular portion of the shaft hole, the circular shaft portion of the rotating shaft is fitted into the shaft hole, and a spring pin is inserted into the notch. is driven into elastic engagement with the signal rotor and the rotating shaft, wherein the elastic force of the spring pin against the rotating shaft is shifted to one side from the center line of the rotating shaft. A signal rotor fixing device for a signal generator, characterized in that the notch is provided at a position where the rotor is fixed.