JPH0526687A - Rotation angle detecting device and assembling method therefor - Google Patents

Abstract

PURPOSE:To reduce the size, weight and cost of a rotation angle detecting device. CONSTITUTION:An outer wall part 12 is provided at a case 7 for a signal detecting unit to act as a cover of a rotation angle detecting device itself. By thus eliminating the cover, assembling workability for disposition, fixing, etc., is improved, the cost is reduced, an outer diameter and height of the detecting device is reduced, thereby the device can be compact and light in weight.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation angle detecting device, and more particularly to the shape of a signal detecting unit.

[0002]

2. Description of the Related Art As described in Japanese Utility Model Laid-Open No. 60-86917, a conventional device is a rotation angle detection device, in which a signal detection device is provided on the outer periphery of the signal detection device in order to protect the signal detection device from dust. The structure was such that it was covered with a base and a cover on a flat plate.

[0003]

In the above-mentioned prior art, the signal detecting unit and the cover must be fixed with screws when manufacturing the rotation angle detecting device, which requires a large number of parts, material cost, and assembly. There was a problem that both the cost and the cost became high. It was also disadvantageous in making the rotation angle detector smaller and lighter. An object of the present invention is to reduce the size and weight of the rotation angle detection device and reduce the cost.
In particular, the cover of the rotation angle detection device is abolished.

[0004]

In order to achieve the above object, the signal detecting unit is provided with a peripheral wall and also serves as a cover. Further, the circuit portion of the signal detection unit is arranged above the signal rotor in the shaft axial direction.

[0005]

In the rotation angle detecting device of the present invention having such a structure, the signal detecting unit is provided with the peripheral wall and joined to the housing, so that the signal detecting portion vulnerable to dirt such as dust can be surely protected. it can. Further, since the signal detection unit also serves as the cover of the rotation angle detection device, the cover can be eliminated, and the work of arranging and fixing the cover can be eliminated.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings.

Reference numeral 1 denotes a shaft which is synchronized with the engine and rotates at half the rotational speed thereof, 2 denotes a housing having a flat surface as a mounting base, and 3 denotes a bearing. Shaft 1
A collar 4 is attached to one end of the, and a rotary plate 6 serving as a signal rotor is interposed between the collar 4 and the pressing plate 5 and pressure-bonded thereto. Reference numeral 7 is a case made of synthetic resin, in which a hybrid integrated circuit 8, a light emitting element 9, and a light receiving element 10 are incorporated. Further, the case 7 has a shape in which the connector 11 and the outer wall portion 12 of the rotation angle detection device are integrated, and is fixed to the housing 2 with screws. Further, the hybrid integrated circuit 8 is arranged above the rotary plate 6.

Here, the shaft 1 rotates in synchronism with the rotation of an engine (not shown), the optical signal interrupted by the rotary plate 6 is converted into an electric signal by the integrated circuit 8, and the signal is used as a crank angle signal of the engine through a connector. The engine is controlled by being transmitted to a control unit (not shown). The upper surface of the housing 2 is formed of a substantially flat surface, and substantially does not have a rising portion that forms a peripheral wall of the distributor. Instead, the case as the signal detection unit is provided with the outer wall portion 12 to form the peripheral wall of the rotation angle detection device.

In this embodiment, the integrated circuit burying portion of the case 7 and the outer peripheral portion 12 form a signal detecting device accommodating chamber. As a result, it is possible to prevent intrusion of dust or the like, which may cause a decrease in signal detection capability.

Next, the assembling method will be described.

The shaft 1 is supported on the housing 2 via bearings 3.

A rotary plate 6 is sandwiched and fixed between the collar 4 and the pressing plate 5. On the other hand, a hybrid integrated circuit 8, a light emitting element 9, and a light receiving element 10 are embedded in the case 7. Here, the case 7 is slid in the radial direction of the rotary plate 6 incorporated in the housing 2, so that the light emitting element 9 and the light receiving element 1
Insert the rotating plate 6 into the 0 gap. Case 7 in this state
To the housing 2 with screws.

According to this embodiment, since the case 7 has the outer wall portion, it can be used also as the cover of the rotation detecting device, so that stable dustproof and waterproof performance can be obtained. In addition, since it does not need to have a double structure of the signal detection part and the cover, it is excellent in downsizing and weight saving, and the assembly man-hours such as fixing and arranging the parts can be reduced. Is also excellent.

[0014]

As described above, according to the present invention, the outer peripheral wall of the rotation angle detecting device itself is formed by the outer peripheral wall of the cup-shaped signal detecting unit placed on the flat base of the rotation angle detecting device housing. As a result, it is lighter in weight, smaller in diameter and lower in height, so it can be made smaller. Further, since the number of constituent parts can be reduced, there is an advantage that the work such as arrangement and fixing can be reduced and the assembling can be facilitated.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

[Explanation of symbols]

1 ... Shaft, 2 ... Housing, 6 ... Rotating plate, 7 ... Case, 12 ... Outer wall part.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazutoshi Kobayashi             2520, Takaba, Katsuda City, Ibaraki Prefecture             Hitachi, Ltd. Automotive Equipment Division (72) Inventor Masaru Ujikawa             2477 Kashima Yatsu, Katsuta City, Ibaraki Prefecture             3 Hitachi Automotive Engineering             Within the corporation (72) Inventor Kenichi Katagishi             2477 Kashima Yatsu, Katsuta City, Ibaraki Prefecture             3 Hitachi Automotive Engineering             Within the corporation (72) Inventor Koji Shiina             Katsuta City, Ibaraki Pref.             Vessel Technology Research Association

Claims (3)

[Claims] 1. A signal detection unit and a signal detection unit comprising a signal detection unit for detecting a signal generated in synchronization with the rotation of an engine and a connector unit connecting the signal detection unit and a control device for an internal combustion engine. In a rotation angle detection device having a housing having a fixing seat surface for mounting a signal rotor and a signal rotor fixed to a shaft that rotates in synchronization with rotation of an engine and rotating integrally with the shaft, a peripheral wall is provided in the signal detection unit. A rotation angle detecting device characterized in that the peripheral wall is also used as a peripheral wall of the rotation angle detecting device. 2. The rotation angle detecting device according to claim 1, wherein the circuit portion of the signal detecting unit is arranged above the signal rotor in the shaft axial direction. 3. A flat signal detector base made of a metal material,
Stick out the shaft where the signal rotor is fixed,
A signal detection unit in which a connector connected to a control device for an internal combustion engine, a signal detection unit, and a rotation angle detection device are integrated,
A method for assembling a rotation angle detecting device, characterized in that it encloses a signal rotor.