JPS5943311A - Detector for angle of rotation - Google Patents

Abstract

PURPOSE:To facilitate assembly of a distributor and to achieve effective use of a space by a detector wherein a photoelectric pickup and an electric circuit are housed in a case which is then arranged in a housing for the distributor. CONSTITUTION:A photoelectric pickup 13 and a hydrid integrated circuit 12 as a electric circuit are made integral and housed in a synthetic resin case 10 provided at its center with a through hole for receiving a shaft 1. The case 10 is then arranged on the bottom surface of a housing 2 for a distributor. At this time, the electric circuit 12 is disposed on the inner side of the case 10, while the pickup 13 is disposed on the outerside of the case 10. By so arranging, it becomes possible to facilitate assembly of the distributor and to effectively utilize a space.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotation angle detection device used in an internal combustion engine, and more particularly to a rotation angle detection device that obtains a predetermined pulse signal in synchronization with the rotation of a power distributor.

The ignition timing of an internal combustion engine affects exhaust gas and fuel efficiency. Therefore, in order to set this to the optimum value, the ignition timing is generally controlled by using a power distribution device that rotates in synchronization with the internal combustion engine, and by providing this power distribution device with a centrifugal advance mechanism and a negative angle advance mechanism. ing.

However, since the advance angle mechanism is a mechanical control system, its accuracy and responsiveness are poor, and for this reason, control systems that eliminate these drawbacks using electronic circuits have recently been adopted. When controlling with an electronic circuit, various detection devices are required, and one important detection device is a crank angle rotation angle detection device.

As an example of this rotation angle detection device, a disc made of a magnetic material is rotated in synchronization with the crankshaft, and a protrusion protruding in the circumferential direction of this disc and a magnetic pickup opposite to this protrusion are used. There is a method in which a change in magnetic gravity is extracted as an alternating voltage to obtain a predetermined pulse signal.

However, since the above method directly detects the rotation angle of the crankshaft, there is a drawback that the mounting space is limited. There is also the problem that malfunctions are likely to occur due to the influence of external devices, such as changes in magnetic gravity caused by large current flowing through the starting motor during startup, leakage magnetic flux from a generator or an electromagnetic clutch for a car cooler, and the like.

For this reason, attempts have been made to eliminate the above-mentioned drawbacks by incorporating a photoelectric pickup and an electronic circuit into a power distribution device whose rotary plate rotates in synchronization with the crankshaft to extract a predetermined pulse signal. It's here.

Generally, the pulse signal is, for example, 36 times per revolution of the power distributor.
It consists of 0 angular position signals generated and 6 reference position signals generated in a 6-cylinder engine, and both signals are synchronized with each other. That is, in order to extract rotation information of the crankshaft, angular position signal pulses within a predetermined time are counted, and the ignition timing is determined using a reference position signal.

Although this type of computerization can improve space efficiency and reliability, in order to further reduce the size and weight, it is necessary to efficiently store it within the embryonic device with consideration to assembly efficiency. However, sufficient countermeasures have not been taken in the past.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotation angle detection device in which each member is efficiently housed in a power distributor in consideration of ease of assembly.

That is, the present invention provides a rotation angle detection device in which a photoelectric pickup and an electronic circuit are built into a power distributor, in which an electronic circuit unit is disposed at the bottom of the power distributor housing, a rotating shaft passes through the center of this unit, and a hybrid An electronic circuit formed of an integrated circuit is provided inside a case of the unit, the photoelectric pickup is arranged on the outside of this case, and a connector to be connected to an external circuit is integrally molded in a part of the case. The outer periphery of the unit and the inner diameter of the housing are fitted together, and a screw for mounting the unit is installed inside the inner diameter of the housing.

FIG. 1 shows an embodiment of the present invention, which includes a shaft 1 that is synchronized with the engine and rotates at 1/2 the engine speed, a housing 2 that houses each member and functions as a case, and a shaft a bearing 3 provided between the shaft 1 and the housing 2; a collar 4 provided at the end of the shaft 1; a pin 5 press-fitted into the flange portion 4a of the collar 4; and a collar 6 provided in connection with the collar 4. , a hole 7 provided in the flange portion 6a of the collar 6, and the flange portions 4a and 5a.
a rotary plate 8 installed between them, a screw 9 for press-fitting the collars 4 and 6 to the stage 1a of the shaft 1, a case 10 made of synthetic resin and installed in the housing, and a case 10 integrally molded with the case 10. a connector 11 for taking out signals to the outside;
It is comprised of a hybrid integrated circuit 12 housed in a case 10, a photoelectric pickup 13 assembled integrally with the case 10, and screws 14 that fix the case 10 to the bottom surface of the housing 2. In the following, the assembly of the hybrid integrated circuit 12 and the photoelectric pickup 13 installed in the case 10 will be referred to as an electronic circuit unit 15.

In the above configuration, the first collar 4 is attached to one end of the shaft 1, and the pin 5 is press-fitted into the flange portion 4a of the collar 4. The pin 5 fits into a hole 7 provided in the flange portion 6a of the second collar 6. Flange part 4a
A rotary plate 8 is mounted between the flanges 4a and 5a, and the second collar 6 and the first collar 4 are pressed against the stepped portion 1a of the shaft 1 with screws 9, and the rotary plate 8 is attached to both flanges 4a, It is held between 6a. A case 10 made of synthetic resin is integrally molded with a connector 11 for outputting signals to the outside.
The case 10 is provided with an electronic circuit formed by a hybrid integrated circuit 12. The photoelectric pickup 13 is assembled integrally with the case 10 and is fixed to the bottom surface of the housing 2 with screws 14.

FIG. 2 is a plan view showing details of the electronic circuit unit, and FIG. 3 is a sectional view.

Three metal bushes 28 having holes 21 are embedded in the case 10, and the screws 14 in FIG. 1 pass through them. The photoelectric pickup 13 includes a light emitting element 23 and a light receiving element 24.
The light emitting element 23 is installed on the holding member 22. The lead 23a of the light emitting element 23 is attached to the lead frame 2.
6 and 27, the leads of the light receiving element 24 are attached to the lead frame 2.
7 are welded to each other. Element 11 of connector 11
a is welded to the lead frame 29 and electrically connected to the hybrid integrated circuit 12.

The lead frames 26, 27, 29 are made of brass plates, for example.
It is made of a material such as a phosphor bronze plate, and a thin one is selected to have a relatively large number of possibilities. A positioning member 25 made of synthetic resin has holes passing through the leads 23a and 24a, and holds the lead frame 26.

FIG. 4 is an exploded view showing how to assemble the electronic circuit unit 15.

The hybrid integrated circuit 12 consists of an element 12b mounted on a ceramic substrate 12a and lead frames 27 and 29. As is well known, these parts are soldered together.

A connector 11 is formed by embedding a terminal 11a in the case 10, and a protrusion 31 is formed in a part.

The positioning member 25 is molded from synthetic resin, and has holes 25a, 2
5b, and a lead frame 30 is fixed thereto. The lead 23a of the light emitting element 23 and the lead 24a of the light receiving element 24 pass through the hole 25a, and the protrusion 31 passes through the hole 25b. The holding member 25 is fixed to the case 10 by hot caulking the head of the protrusion 31.

Next, the hybrid integrated circuit 12 is placed on the case 10 and fixed with adhesive. When placed, lead frame 2
7 and 29 are arranged so as to be close to the lead 23a of the light emitting element, the lead 24a of the light receiving element, and the terminal 11a. In the next step, they are connected by welding.

In the above embodiment, in order to fix the electronic circuit unit 15 to the housing 2, the screw 14 passes through the bush 28 having the play hole 21 and is screwed into the screw hole provided in the housing 2. Alternatively, a through hole may be provided in the housing 2 and a screw hole may be provided in the bush 28 for fixation. Further, the arrangement of the light emitting element 23 and the light receiving element 24 of the photoelectric pickup 13 may be reversed.

According to the embodiment of the present invention described above, when an electronic circuit unit is installed at the bottom of a housing of a power distribution device, a shaft passes through the central part of the unit, and around the shaft, electronic circuit elements, connectors, and photoelectric circuit elements are installed. By installing a photoelectric pickup, etc., the inner diameter of the housing can be used effectively, and the ceramic substrate that forms the electronic circuit is installed inside the case, and part of the photoelectric pickup is placed outside the case. The height of the electronic circuit unit can be reduced.

Furthermore, since the leads of the light-emitting element and the light-receiving element can be installed at predetermined positions using positioning members, welding work to the lead frame can be easily performed.

As is clear from the above, according to the present invention, each member can be efficiently housed in the power distributor while improving assembly workability.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a plan view of an electronic circuit unit, FIG. 3 is a sectional view thereof, and FIG. 4 is an exploded view of the electronic circuit unit. 1... Shaft, 2... Housing, 4, 6...
Color, 8... Rotating plate, 10... Case, 11...
・Connector, 12...Hybrid integrated circuit, 12a
... Ceramic substrate, 13... Photoelectric pickup, 23... Light emitting element, 23a, 24a... Lead,
24... Light receiving element, 25... Positioning member, 27...
··Lead frame.

Claims (4)

[Claims] 1. A rotary plate attached to a shaft that rotates in synchronization with the rotation of the crankshaft, a photoelectric pick-up that detects light from a light emitting element according to the rotation of the rotary plate, and a detection value number of the pick-up. In the rotation angle detection device for obtaining a predetermined pulse signal by incorporating an amplifying electronic circuit in a power distribution device, the photoelectric pickup and the electronic circuit are integrated, and the shaft is inserted into a synthetic resin case in the center thereof. The electronic circuit unit is shrunk to form an electronic circuit unit, and the electronic circuit unit is disposed at the bottom of the housing of the power distributor, and the electronic circuit is disposed inside the synthetic resin case, and the pickup is disposed on the outside thereof. A rotation angle detection device characterized in that: 2. Claim 1, wherein the leads of the light emitting element and the light receiving element are brought into contact with the lead frame of the electronic circuit via a positioning member made of an insulating material and having a hole through which the leads can pass. The rotation angle detection device described. 3. 2. The rotation angle detection device according to claim 1, wherein a connector for electrically connecting the electronic circuit to the outside is integrally molded as a part of the synthetic resin case. 4. 2. The rotation angle detection device according to claim 1, wherein said electronic circuit is a hybrid integrated circuit.