JPH04153581A - Packing assembly body for revolution angle detecting device - Google Patents

Abstract

PURPOSE:To obtain the shape of a flat packing for the sealing in three directions at a low cost by forming the shape in single body before assembly into a flat 8-figure shaped packing form. CONSTITUTION:A revolution angle detecting device 3 is equipped with a connector 3a for the electric connection with a controller, and a cover 2 for protecting the revolution angle detecting device 3 consisting of electronic parts and a signal rotor 11 as thin precision parts mechanically and from environment is fixed on a housing 1 by small screws which are not shown on the figure through packings 4, 4a, and 4b. As for the part 4a of the flat 8-figure shaped packing, the revolution angle detecting device 3 is inserted into the connector part 3a, and the part 4b is installed on the cover 2 fitting part of the housing 1. Accordingly, simultaneous seal in three directions is enabled at a low cost similarly to the conventional one by twisting a sealing basic member in a joint part by utilizing the property of the flat 8-figure shaped packing elastic body.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a packing shape and mounting method used for an internal combustion engine power distribution device mounted in an engine room.

[Conventional technology]

The power distributor with a built-in rotation angle detection device is P63-232.
There is something like 508.

Conventional packing shapes have a three-dimensional structure to seal in three directions.

Therefore, it has multiple shapes.

[Problem to be solved by the invention]

In the above-mentioned prior art, the packing is manufactured according to the shape to be sealed, resulting in a three-dimensional packing shape, which complicates the structure of the mold, resulting in a reduction in the number of molds purchased and problems in terms of cost.

An object of the present invention is to eliminate the three-dimensional pan gong shape that seals in three directions, and to provide a packing shape that has a simplified flat shape and has a low cost and seals in three directions.

[Means to solve the problem]

In order to achieve the above purpose, by making the packing state flat before assembly, and twisting the seal base material of the loop joint of the figure 8 packing group during assembly using elastic force,
Three-dimensional seal part (figure 8 packing in the initial flat state can be accommodated in three directions).

Furthermore, since the number of molds that can be made is limited when manufacturing a packing that fits a circular housing, the shape of the housing before assembly is oval, reducing the effective area for molding. The number of items taken increases each time.

[Effect]

In the packing shape that seals in three directions, the initial state is a flat figure-of-eight packing, and by using the elastic body of the packing and twisting the seal base material at the joint, it is possible to seal in three directions, so it is inexpensive. A flat figure-eight packing can be used.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In FIG. 1, a shaft 1o is attached to a housing 1 with a ball bearing 12. The signal rotor 1 is rotatably attached to the shaft 10 via an oil seal 13 or the like.
1 is attached with a machine screw 14 and rotates together with the shaft 10.

A single rotation angle detection device 3 is attached to the housing 1 with a machine screw (
(not shown).

Here, the shaft 10 rotates via a coupling 15 in synchronization with the rotation of an internal combustion engine (not shown), and an intermittent signal is transmitted by the signal rotor 11 via the rotation angle detection device 3 as a crank angle position signal of the engine. and is transmitted to a control device (not shown). Further, upon receiving a proper engine ignition timing signal sent from the control device, a high voltage is generated in an ignition coil (not shown).

The rotation angle detection device 3 has a connector 3a for electrical connection with the control device.

The cover 2 for protecting the rotation angle detection device 3, which is an electronic component, the signal rotor 11, which is a thin precision component, etc. from mechanical and environmental resistance, includes packings 4, 4a, and 4b.
It is fixed to the housing 1 via a machine screw (not shown).

FIG. 2 shows the one-rotation angle detection device 3 and the three-dimensional packings 4', 4a', and 4b' of the conventional product.

FIG. 3 shows the flat figure 8-shaped packing 4 of the present invention, in which part 48 inserts the rotation angle detection device 3 into the connector part 3a, and part 4b is provided in the fitting part of the cover 2 of the housing 1. .

According to this embodiment, by utilizing the properties of the elastic material of the flat figure-8 packing and twisting the seal base material at the joint, it is possible to perform simultaneous sealing in three directions at low cost and no different from conventional methods. This has the effect of

FIG. 4 is a shape study diagram taking into consideration the productivity of the flat figure-eight packing shown in FIG.

According to this embodiment, the elliptical packing 4'' allows for an increase in the number of molds to be made, which further improves productivity, and provides cheaper packing than the circular packing 4.

〔Effect of the invention〕

According to the present invention, it is possible to seal in three directions with flat packing, compared to conventional three-dimensional structures.

The mold can be simplified, the number of molds can be increased, and the cost can be reduced.

In addition, an oval packing shape is placed in the seal between the circular housing and the same-shaped cover, and an elastic body is used to
Since it is provided in a circular housing, it also has the effect of further improving mold dispersion.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of one embodiment, Fig. 2 is a perspective view of the rotation angle detection device built in Fig. 1 and a conventional packing as a single unit, and Fig. 3 is a product of the present invention. FIG. 4, a perspective view of the flat packing, shows the number of molds to be molded during molding, and is a diagram comparing the circular and elliptical shapes. DESCRIPTION OF SYMBOLS 1...Housing, 2...Cover, 3...Rotation angle detection device, 4...Packing, 4a...4 backing circular seal part, 4b...4 connector seal part.

Claims (1)

[Claims] 1. A shaft that rotates in synchronization with the engine crankshaft, a rotary plate that rotates integrally with the shaft and has a predetermined slit, and a rotation angle detection that detects a signal by the rotation of the rotary plate. The device (with a built-in electronic circuit), etc. is fixed to the housing, and a cap with a power distribution terminal is fastened to the top of the housing with screws (in the case of only a rotation angle detection device without a power distribution section, the cover is fixed). ), In the rotation angle detection device, a connector for enabling electrical connection with the outside protrudes from the side surface of the housing, and a fitting part for these is provided with a waterproof and dustproof connector. In an assembly structure in which a three-dimensional figure-eight-shaped packing is arranged, the three-dimensional figure-eight-shaped packing has a shape of a flat figure-eight packing when it is alone before being assembled. Packing assembly for angle detection device. 2. In claim 1, the shape of the flat 8-shaped packing does not match the shape of the insertion portion of the circular housing, but is oval, and the packing is inserted using elastic force during installation. Packing assembly for rotation angle detection device.