JPH07939Y2 - Sealing structure for braking oil in acceleration detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is installed in a vehicle or the like, and when the vehicle bends a curve or the like, it detects an acceleration in a lateral direction with respect to the traveling direction of the vehicle and detects the magnitude of the acceleration. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acceleration detecting device for improving the running stability of a vehicle by controlling the power assist amount of the power steering of the vehicle depending on the degree, and particularly to a braking oil seal structure.

(Prior Art) An acceleration detection device includes a magnetoresistive element and a swingable permanent magnet that responds to an acceleration in a lateral direction with respect to a traveling direction of a vehicle in a main body case, and the permanent magnet is sealed by an upper lid. The swing is braked by the braking oil filled in the main body case. When the vehicle bends in a curve or the like, the permanent magnet is braked in the braking oil by the centrifugal force and swings. The change in the position of the permanent magnet due to this swing causes a change in the magnetic field of the magnetoresistive element, which changes the resistance value and changes the voltage generated at the output terminal connected to the terminal of the magnetoresistive element. Conventionally, this change in voltage is taken out of the case between the main body case and the upper lid by a lead wire, and is taken into a control circuit that controls the power assist amount of the power steering to control the power assist amount and to drive the vehicle. It is designed to improve stability.

(Problems to be solved by the present invention) However, in the acceleration detecting device having the above-described structure, it is necessary to seal between the upper lid and the main body case in order to prevent the leakage of the braking oil. Since the lead wire guided from the terminal to the outside of the main body case is taken out to the outside of the main body case from between the main body case and the upper lid, there is a problem that the sealing structure of the lead wire takeout portion becomes complicated.

(Means for Solving the Problem) The present invention is intended to solve the above-mentioned problems, and as a means thereof, a recess is formed in the main body case, and the recess is formed in the recess. A leaf spring having one end fixed to the case and the other end fixed to a weight and a permanent magnet is arranged, a magnetoresistive element is provided at a position opposed to the permanent magnet, and the recess is filled with a braking oil. In an acceleration detection device having a sealed place, a terminal insertion hole is formed from the back surface of the case toward the recess, and a step portion is formed around the insertion hole on the back surface side of the case, and the terminal has the step portion. Having a flange that comes into contact with the back surface of the surrounding case, the terminal is fitted into the terminal insertion hole via an O-ring arranged in the step portion, and one end of the terminal is made to face the recess, The magnetoresistive element is installed Together they are connected to a circuit board that is, in which so as to seal the upper lid the recess through an O-ring.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 is a plan view of the inside of the acceleration detecting device according to the present invention, FIG. 2 is a sectional view taken along the line I--I in FIG. 1 with an upper lid attached, and FIG. 3 is an external front view of the acceleration detecting device according to the present invention. FIG. 4 is a plan view of FIG. 3, and FIG. 5 is a bottom view of FIG.

As shown in FIGS. 1 and 2, in a recess 10 formed in the main body case 1, one end is fixed to the other end of a leaf spring 3 fixed to the main body case, and a weight 4 and a permanent member are attached. The magnet 5 is swingably arranged. A magnetic resistance element 6 is arranged in the body case 1 at a position facing the permanent magnet 4, and a voltage supply terminal 20, a ground terminal 21,
The output terminals 22 are connected to the respective printed wiring portions 24 of the flexible printed circuit board 23 arranged around the recess 10 on the upper surface of the main body case.

The main body case 1 located at each end of the printed wiring portion 24 is provided with terminal insertion holes 9 from the rear surface of the main body case toward the recesses 10, and each terminal on the rear surface side of the main body case. A hollow cylindrical step portion 11 and a concave portion 14 are continuously provided around the insertion hole 9. A terminal 7 having a flange 8 at a substantially middle portion thereof is fitted into each of the terminal insertion holes 9 from the rear side of the main body case via an O-ring 12 arranged in the step portion 11, and the recess is formed. It is projected into the inside of the flange 10.
Is abutted on the stepped portion 11 of the main body case 1. The terminal 7 is fixed to the main body case 1 by filling the concave portion 14 with epoxy resin and fixing the protruding portion of the terminal protruding into the concave portion 10 with a push nut 25. The projecting portion of the terminal 7 is connected to each printed wiring portion 24 of the flexible board 23 by soldering, and each terminal 7 projecting to the rear surface of the main body case is a main printed circuit board (not shown).
By being connected to each of the printed wiring parts, the main body printed board and the voltage supply terminal 20, the ground terminal 21, and the output terminal 22 protruding from the magnetoresistive element 6 constitute each electric circuit.

Further, the upper lid 2 is an O-ring 13 (see FIGS.
The main body case 1 is sealed via the
The main body case 1 and the upper lid 2 are integrally fixed by caulking the caulking portion 2a provided on the side surface of the upper lid 2 in the recessed groove 1a provided on the side surface. The upper lid 2 has a brake oil (braking oil) that brakes the swing of the permanent magnet 5 that swings in the recess 10 formed in the main body case 1 in response to an acceleration lateral to the traveling direction of the vehicle. After the main body case 1 is filled with (not shown), the braking oil is provided around the O-ring 13 disposed between the main body case 1 and the upper lid 2 and the terminal insertion hole 9. The O-ring 12 disposed on the stepped portion 11 completely seals without leaking.

(Effect of the Invention) In the present invention, a terminal insertion hole is formed from the rear surface of the main body case toward the recess, and a step portion is formed around the insertion hole on the rear surface side of the case. The terminal has a flange that comes into contact with the back surface of the case, and the terminal is inserted into the terminal insertion hole through an O-ring arranged in the step portion, and one end of the terminal is made to face the recess, and the magnetic Since the connection is made to the circuit board provided with the resistance element, not only the reliable conduction of the terminal can be obtained, but also the lead wire guided from the magnetoresistive element to the outside of the main body case is not required, and the conventional technique is not required. The problem that the seal of the lead wire portion is complicated is solved. Further, since the lead wire conventionally disposed between the main body case and the upper lid can be eliminated, the case main body and the upper lid can be fitted and separated very easily.

[Brief description of drawings]

1 is a plan view of the inside of the acceleration detecting device according to the present invention, FIG. 2 is a sectional view taken along the line I--I in FIG. 1 with an upper lid attached, and FIG. 3 is an external front view of the acceleration detecting device according to the present invention. FIG. 4 is a plan view of FIG. 3, and FIG. 5 is a bottom view of FIG. 1 ... Main body case, 2 ... Top cover, 3 ... Leaf spring, 4 ... Weight, 5 ... Permanent magnet, 6 ... Magnetoresistive element, 7 ... Terminal, 8 ... Flange, 9 ... Terminal insertion hole, 10 …… Recess 11 …… Step, 12 …… O-ring 13 …… O-ring

Claims (1)

[Scope of utility model registration request] 1. A recess is formed in a main body case, and the recess is
A leaf spring having one end fixed to the case and the other end fixed to a weight and a permanent magnet is arranged, a magnetoresistive element is provided at a position opposed to the permanent magnet, and the recess is filled with a braking oil. In an acceleration detection device having a sealed place, a terminal insertion hole is formed from the back surface of the case toward the recess, and a step portion is formed around the insertion hole on the back surface side of the case, and the terminal has the step portion. Having a flange that comes into contact with the back surface of the surrounding case, the terminal is fitted into the terminal insertion hole via an O-ring arranged in the step portion, and one end of the terminal is made to face the recess, A braking oil seal structure in an acceleration detecting device, wherein the recess is sealed by an upper lid while being connected to a circuit board provided with the magnetoresistive element.