JPS6241875Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sensor that detects the rotational direction of a rotating body such as a handle.

A direction switch in an automobile is closed when a lever is manually rotated, and is opened when the steering wheel is turned over and the lever is automatically returned to a neutral position. In other words, since this type of switch controls opening and closing by mechanically releasing the operating lever of the switch by rotating the handle, the mounting position of the switch is limited to the area around the handle shaft, which makes the design difficult. There is little freedom in

Incidentally, in recent years, there has been a demand for a new conceptual change in the design of automobile instrument panels, and it has also become necessary to increase the degree of freedom in the mounting position of direction indicating switches. That is, there is a need for a direction indicator switch that can be electrically held and electrically released. However, one of the things that makes it difficult to realize the electrical direction switch described above is the need for a sensor that electrically detects the rotation of the handle and detects the direction of rotation of the handle in order to release the electrical hold on the switch. be.

The present invention relates to the improvement of a sensor for detecting such a rotational direction, and it is possible to reliably detect the rotational direction of a rotating body such as a handle by simply attaching a switch with a simple structure around the handleshaft. The purpose is to provide a detection sensor.

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view, FIG. 2 is a plan view of the assembled state, and FIG. 3 is a sectional view taken along the line -1, in which 1 is a handle, 2 is a shaft that rotates as the handle 1 rotates, and 3 is a mounting board fixed to a fixed part such as a housing disposed on the outer periphery of the shaft 2, and a cylindrical part 3a is formed in the center thereof,
The shaft 2 is inserted here. Further, a ring-shaped step portion 3b is formed on the mounting board 3, and a shaft portion 3c is formed in a part of the ring-shaped step portion 3b. 4 is a movable plate placed on the step portion 3b of the mounting board 3;
A bearing portion 4a is formed into which the shaft portion 3c is fitted. Furthermore, movable contacts 5 and 6 are attached to both sides of the bearing portion 4a on the movable plate 4, and fixed contacts 7 and 8 that are in constant contact with the movable contacts 5 and 6 are attached. The fixed contacts 5 and 6 are bent when the convex parts 5a and 6a are pushed by a cam part 9c of a cancel cam 9, which will be described later, and the fixed contacts 7 and 6 are bent.
8 and becomes an open state as a switch. Further, on the movable plate 4, the bearing portion 4a is
Protrusions 4b are formed on the left and right sides of the opposite side, and a slip portion 9b of the cancel cam 9, which will be described later, is formed here.
A leaf spring 10 that is in sliding contact with is suspended. Reference numeral 9 designates a hollow cylindrical cancell cam that is fitted into the cylindrical portion 3a of the mounting board 3, and has three protrusions 9a formed on its upper surface, which are fitted into the small holes 1a formed on the lower surface of the handle 1. As the handle 1 is rotated, it is rotated as the handle 1 is rotated. Further, an annular slip portion 9b is formed in the lower part of the cancel cam 9, and the surfaces facing each other in the axial direction are in sliding contact with the convex portions 5a, 6a of the movable contacts 5, 6, and are separated from the fixed contacts 7, 8. A cam portion 9c is formed for this purpose. Note that a spring 11 is inserted into the hollow portion 9d of the cancel cam 9, and constantly presses the cancel cam 9 toward the handle 1 side.

Therefore, if the handle 1 is now rotated to the right, the cancel cam 9 will also be rotated to the right (clockwise in FIGS. 4 and 5), so the movable plate 4 will be rotated by the leaf spring 10.
Due to the friction between the movable plate 4 and the slip portion 9b of the cancel cam 9, the movable plate 4 is rotated to the right (clockwise) about the bearing portion 4a as a fulcrum until the inner peripheral edge of the movable plate 4 comes into contact with the slip portion 9b. When the handle 1 is further rotated and the cancel cam 9 is rotated, the cam portion 9c of the cancel cam 9 comes into contact with the convex portion 5a of the movable contact 5, pressing the movable contact 5 and separating it from the fixed contact 7 ( Figure 5). This means that the switch is opened, but this switch is unrelated from a circuit perspective because it is a counterclockwise rotation detection switch, as can be seen from the circuit described later.

Next, when the handle 1 rotates counterclockwise due to the return of the handle 1 after the clockwise rotation is completed, that is, after the right turn is completed, the cancel cam 9 also rotates counterclockwise, and the leaf spring 10 and the slip are rotated in the same way as in the case of clockwise rotation. Part 9
Due to the friction with b, the movable plate 4 is rotated to the left (counterclockwise) about the bearing 4a as a fulcrum. When the cam portion 9c of the cancel cam 9 presses the movable contact 6, the movable contact 6 is separated from the fixed contact 8 (FIG. 6). This means that the switch is released. When the handle 1 is rotated clockwise, the movable contact 6 is moved away from the trajectory of the cam portion 9c, and when the handle 1 is rotated counterclockwise, the movable contact 5 is moved away from the trajectory of the cam portion 9c, so that it maintains contact with each fixed contact 8 or 7. be done.

Next, the operation of canceling a direction indicator light in an automobile using the rotation direction detection sensor described above will be explained with reference to FIG.

B is a power supply such as a car battery, F is a turn signal flasher that generates a pulse signal, S ₁ , S ₂
are normally in a neutral state due to springs, etc., and when a lever (not shown) or the like is operated, the movable contacts S ₁₁ and S ₂₁ switch to the left fixed contacts S ₁₂ and S ₂₂ or the right fixed contacts S ₁₃ and S ₂₃ An interlocking turn signal switch and a reset switch are connected to either of them, and S is a movable contact of reset switch _S2 by operating turn signal switch _S1 , which is interlocked with reset switch _S2 .
When S ₂₁ is connected to either fixed contact S ₂₂ or S ₂₃ , it becomes energized and becomes a solenoid that maintains the above connection state, and operates reset switch S ₂ to close the movable contact.
When _S21 is brought into the neutral state, it is de-energized and the holding of turn signal switch _S1 is also released. L
_L and L _R are the left turn signal light and the right turn signal light.

In the above circuit, when the turn signal switch S ₁ is tilted to the right side by operating a lever or the like, the movable contact S ₁₁ and the fixed contact S ₁₃ are connected, and therefore the pulse signal from the flasher F activates the switch S ₁ . is applied to the right turn signal light L _R through the light L R, and the light L _R starts blinking. Also switch
Since the movable contact _S21 of the reset switch _S2 is also connected to the fixed contact _S23 in conjunction with the operation of the reset switch _S1 , even if the solenoid S is energized and you release your hand from the turn signal switch _S1 , the two switches will not operate. S ₁ and S ₂ are kept connected. Therefore, the light L _R continues to blink.

If you want to stop the flashing of the light L _R , return the movable contact S ₂₁ of the reset switch S ₂ to the neutral position and cut off the power to the solenoid S.
The movable contact _S11 of the turn signal switch _S1 also returns to the neutral position, and the power to the light L _R is also cut off.
The turn signal is therefore canceled.

Next, a description will be given of the operation of automatically turning off the light L _R by operating the reverse rotation steering wheel after the right turn is completed while the right turn signal light L _R is blinking.

When the handle 1 is rotated to the right, the 4th and 5th
As explained in the figure, the movable contact 5 and the fixed contact 7 are opened, but the movable contact _S21 of the reset switch _S2
Since is connected to the fixed contact _S23 side, the flow of current does not change, so the solenoid S is continuously energized, and the self-holding of the switches _S1 and _S2 continues.

When the handle 1 is rotated to the left by operating the reverse rotation handle after turning to the right, the movable contact 6 and the fixed contact 8 are opened as explained in FIG. 6 above, and the reset switch is activated. The current flowing to the solenoid S via _S2 is cut off. As a result, the holding of the two switches S ₁ and S ₂ is released, the movable contacts S ₁ and S ₂₁ return to the neutral position, and therefore the power to the turn signal light L _R is cut off, and the light L _R is turned off. Ru.

The above example is for the right turn signal light L.
Although the case of canceling the blinking operation of _the left turn signal light _L has been described, the operation is the same as that described above, so the explanation will be omitted.

As described above, in the present invention, the movable plate is displaced by a cam member that rotates together with a rotating body such as a handle, and when the movable plate is displaced, two sets of switches provided on the movable plate are activated by the cam portion of the cam member. Since either one is operated, the rotational direction of the rotating body can be detected reliably with a simple structure, and the reliability is high, and there is also the effect that almost no operation noise is generated.

[Brief explanation of the drawing]

The figures show an embodiment of the rotational direction detection sensor according to the present invention, in which Fig. 1 is an exploded perspective view, Fig. 2 is a plan view in an assembled state, and Fig. 3 is a cross-sectional view taken along the line -
4 to 6 are plan views showing the operating state, and FIG. 7 is a control circuit diagram of the turn signal light. 1... Handle, 4... Movable plate, 5, 6... Movable contact, 7, 8... Fixed contact, 9... Cancel cam, 9c... Cam portion.

Claims (1)

[Scope of utility model registration request] The rotating body is equipped with a cam member having at least one cam portion that rotates together with the rotating body such as a handle, and a movable plate that is displaced as the cam member rotates, and the movable plate is equipped with two sets of switches. A rotational direction detection sensor characterized in that, when the movable plate is displaced by rotation of the cam member, one of the two sets of switches is operated by the cam part.