JPH0441335Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention provides a rotation direction suitable for detecting the rotation direction of a steering wheel in order to automatically stop blinking of turn signal lights of a vehicle, especially an automobile. Regarding detection sensors.

[Conventional technology]

BACKGROUND ART Recently, in automobiles, switches that turn on and blink turn signal lights to instruct left or right turns have been installed in places other than the steering column, such as on instrument panels. In such cases, when the steering wheel is returned to its original position after the direction change, the direction of rotation is detected and the turn signal lights are turned off.
Therefore, various rotational direction detection sensors have been proposed in the past. For example, a movable member that rotates together with a rotating body, a driven member that rotates with a certain angle delay in the same direction as the rotational direction of the movable member, and a fixed member that is always stationary regardless of rotation of the rotating body, and the movable member and The driven member is provided with connection contacts having different intervals in the rotational direction due to the fixed angle delay, and the fixed member is provided with a group of contacts that selectively contact the connection contacts depending on the rotational direction of the rotating body. A detection sensor has been proposed (Utility Model Application Publication 1996-19968).

[Problem that the invention attempts to solve]

However, with the conventional rotation direction detection sensor described above,
Since the movable contacts provided on the movable member and the driven member are always in a sliding state as the steering wheel rotates, connection failures are likely to occur, resulting in reliability problems. Furthermore, since there are four contact points between the input and output, the contact resistance of the contacts between the input and output becomes large, which sometimes poses a problem in terms of durability. Also, since the movable contact moves around the entire circumference, space is required in the diametrical direction.
There was a problem with the large size.

An object of the present invention is to provide a rotational direction detection sensor that can detect the rotational direction by electrically closing only one of a pair of switches depending on the rotational direction of a rotating body.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a rotating body, a rotating member that rotates together with the rotating body and has a concave portion formed on its outer peripheral surface, and a driven member that rotates in the same direction with a certain angle delay and has a recess formed on its outer circumferential surface; a pair of switch means that slides along the outer circumferential surface of the driven member when the driven member rotates to open and close contacts; When the rotating member rotates, the pair of switch means slides along the outer circumferential surface of the rotating member, and selectively opens and closes the pair of switch means at a position other than the concave portion of the outer circumferential surface depending on the rotational direction of the rotating body. This is provided with a switch prohibition means for prohibiting.

[Effect]

According to the above configuration, when the rotating body rotates clockwise, only the contacts of one of the pair of switch means are opened (closed), and the contacts of the other switch means are kept closed by the switch inhibiting means. Ru. Conversely, when the rotating body rotates to the left, only the contacts of the other switch means are opened (closed), and the contacts of one switch means are kept closed (open) by the switch inhibiting means.

〔Example〕

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

Rotation direction detection sensor 1 for a vehicle, for example a car
1, a fixed member 2, a rotating member 3, a driven member 5, a pair of switch means 6,
8 and switch prohibition means 9.

The fixed member 2 consists of a disc part 2a fixed to the steering column side and a cylindrical part 2b formed on the disc part 2a, and a rotatable steering shaft 12 is loosely fitted into the cylindrical part 2b. has been done. A steering wheel 13, which is a rotating body, is fixed to the tip of the steering shaft 12. Further, the cylindrical portion 2b is divided by a flange portion 2d formed at an intermediate portion into an upper cylindrical portion 2e and a lower cylindrical portion 2f having an outer peripheral surface having a diameter slightly larger than the outer peripheral surface diameter of the upper cylindrical portion 2e, for example. .

The rotating member 3 includes a cylindrical portion 3a, a flange portion 3b formed on the upper surface of the cylindrical portion 3a, and a flange portion 3b formed on the upper surface of the cylindrical portion 3a.
The cylindrical portion 3a is rotatably fitted into the upper cylindrical portion 2e of the fixing member 2, with movement in the vertical direction being restricted. A plurality of protrusions 3e are provided protruding from the upper surface of the flange portion 3b on the same circumference, and the protrusions 3e are fitted into small holes 13a formed in the steering wheel 13. Therefore, the rotating member 3 rotates integrally with the rotation of the steering wheel 13. The disk portion 3d is placed on the upper surface of the flange portion 2d of the fixing member 2, and a straight line A passing through the center point O is formed on the outer peripheral surface.
-A, a pair of V-shaped recesses 3f and 3g with gentle slopes are formed facing each other. Further, an elongated arc-shaped recess 3h having an angle _α1 centered on a straight line B-B perpendicular to the straight line A-A is formed on the lower surface of the disc portion 3d.

The driven member 5 is formed into a disk shape, and a through hole 5a formed at its center is inserted into the lower cylindrical portion 2f of the fixed member 2, and movement in the vertical direction is regulated by a ring portion 5b protruding from the lower surface. Ru. The diameter of the outer circumferential surface of the driven member 5 is set to be the same as the diameter of the outer circumferential surface of the disc portion 3d of the rotating member 3, and the outer circumferential surface of the driven member 5 is provided with grooves having the same shape as the recesses 3f and 3g of the rotating member 3. A pair of recesses 5d and 5e located in the same relative position are formed to face each other. A pin portion 5f protrudes from the upper surface of the driven member 5 and faces the recess 3h of the rotating member 3, and the cross section of the pin portion 5f is formed in an arcuate shape with an angle α ₂ .

Here, the angle α ₁ is set larger than the angle α ₂ by an angle of 2D. Therefore, the driven member 5 rotates with a delay of an angle D relative to the rotating member 3.

The switch means 6 and 8 are connected to a switch case 16.
, contact holders 18 and 19, and compression spring 2
0, and the switch case 16 is fixed to the disk portion 2a of the fixed member 2. When the pin portion 5f of the driven member 5 is located at the center of the recess 3h of the rotating member 3 as shown in FIG.
They are arranged radially at intervals of 2D, are slidably fitted into the switch case 16, and are urged in the direction of the steering shaft 12 by a compression spring 20 housed in the switch case 16.
The contact holders 16, 18 have shoulder portions 18a,
a protrusion 18b having an arcuate tip protruding from 19a;
19b is formed, and the projections 18b, 19
b is pressed against the outer peripheral surface of the driven member 5. Contacts 21 and 22 made of U-shaped leaf springs are fixed to the lower surfaces of the contact holders 18 and 19. Board 2
It is adapted to slide on a fixed contact formed on 3.

The switch inhibiting means 9 includes a slide member 25,
A compression spring 26 is provided, and a slide member 25
is placed between the contact holders 18 and 19 on straight line B-B in the state shown in FIG. It is urged in the direction of the steering shaft 12 by a spring 26. The slide member 25 is formed with a flange portion 25a and a protrusion portion 25b having an arcuate tip protruding from the flange portion 25a. Parts 18a, 19a
It is set so that it can come into contact with the Further, the protruding portion 25b is pressed against the outer circumferential surface of the disc portion 3d of the rotating member 3 by a compression spring 26.

FIG. 3 shows a circuit of a direction indicating device using the rotational direction detection sensor 1 of the present invention.
When rotating clockwise, the protrusion 18a of the contact holder 18
A right contact 1aR is provided which turns on via the contact 21 and the printed circuit board 23 when the contact holder 19 protrudes, and a left contact 1aL which turns on via the contact 22 and the printed circuit board 23 due to the protrusion of the protrusion 19a of the contact holder 19 during counterclockwise rotation. . When the solenoid 31 is energized, the turn signal switch 30 changes the turn switch 32 from the ON position to the OFF position.
It is provided with a mechanism for returning to the position, and 33 is a right contact and 35 is a left contact. When the solenoid drive circuit 36 receives a signal from the rotation direction detection sensor 1,
It operates to energize the solenoid 31. When the turn switch 32 is turned on, the flasher circuit 38 operates to flash the direction indicator light in the direction in which it is turned on, and 39 is a right direction indicator light,
40 is a left direction indicator light. Further, 41 is a power source.

Next, the operation of the embodiment of the present invention will be explained.

When changing the direction to the right, first turn the turn switch 32 of the turn signal switch 30 to the right contact 33. Then flasher circuit 3
8, the right direction indicator light 39 blinks. On the other hand, the rotation direction detection sensor 1 is
When the steering wheel 13 is in a neutral state, both the left and right contacts 1aL and 1aR are turned off, and the power source 41 is not supplied to the rotational direction detection sensor 1.

Steering wheel 13 in the state shown in FIG.
When rotated to the right, the rotating member 3 rotates in the direction of arrow E as shown in FIG. 5, and one end surface of the recess 3h abuts the pin portion 5f of the driven member 5. Then, the driven member 5 rotates in the direction of the arrow E with a delay of an angle D relative to the rotating member 3. In this case, the recesses 5d and 5e of the driven member 5 are positioned behind the recesses 3f and 3g of the rotating member 3 by an angle D, respectively. When the rotating member 3 is rotated to a position where the recess 3f faces the protrusion 25b of the slide member 25, the protrusion 25b enters the recess 3f and is pressed into contact with the recess 3f. At the same time, the driven member 5
The recess 5d corresponds to the protrusion 18 of the contact holder 18.
b, and the protrusion 18b is now facing the recess 5.
d and is pressed against the recess 5d. on the other hand,
The protruding portion 19b of the contact holder 19 is pressed against the maximum diameter portion of the driven member 5. Therefore, in the section where the protrusion 18b of the contact holder 18 is in pressure contact with the recess 5d, the rotational direction detection sensor 1
Only the right contact 1aR of is ON.

In this case, the turn switch 32 is connected to the right contact 33
is turned on and the left contact 1aL is turned off, so the power 41 is not supplied to the rotational direction detection sensor 1.

When the steering wheel 13 is further rotated to the right from the state shown in FIG. 5, and the rotating member 3 and the driven member 5 are rotated in the direction of arrow E, the protrusion 18 of the contact holder 18 as shown in FIG.
b is the slide member 25 at the maximum diameter part of the driven member 5.
The projections 25b are pressed against the maximum diameter portions of the disc portion 3d of the rotating member 3, respectively. Further, the protrusion 19b of the contact holder 19 is connected to the recess 5d of the driven member 5.
However, the shoulder portion 19a is in contact with the flange portion 25a of the slide member 25, and is prevented from entering the recess portion 5d. Therefore, the sixth
In the state shown in the figure, the rotation direction detection sensor 1
The left and right contacts 1aL and 1aR are both OFF.

After completing the right direction change, turn the steering wheel 1
When 3 is rotated to the left, only the left contact 1aL is turned on for a certain period of time as described later (see Fig. 7).
At the same time, the power supply 41 is connected to the right contact 33 and the left contact 1aL.
is supplied to the solenoid drive circuit 36, and the solenoid 31 is energized. As a result, the turn switch 32 returns to the OFF position, the power supply 41 to the flasher circuit 38 is cut off, and the right direction indicator light 39 is turned off. On the other hand, the solenoid 31 is in a non-energized state since the turn switch 32 is turned off.

Conversely, when changing direction to the left, first turn the turn switch 32 of the turn signal switch 30.
is applied to the left contact 35. Then, the power 41 is supplied to the flasher circuit 38, and the left direction indicator light 4 is turned on.
0 blinks. On the other hand, the power source 41 is not supplied to the rotation direction detection sensor 1 as in the case of clockwise rotation described above.

When the steering wheel 13 is rotated to the left in this state, the rotating member 13 is rotated as shown in FIG.
rotates in the direction of arrow F, and the other end surface of the recessed portion 3h comes into contact with the pin portion 5f of the driven member 5. Then, the driven member 5 rotates in the direction of the arrow F with a delay of an angle D relative to the rotating member 3. In this case, the recesses 5d and 3g of the driven member 5 correspond to the recesses 3f and 3g of the rotating member 3, respectively.
5e are respectively arranged at positions delayed by an angle D. When the rotating member 3 is rotated to a position where the recess 3f faces the protrusion 25b of the slide member 25, the protrusion 25b enters the recess 3f and is pressed into contact with the recess 3f. At the same time, the recess 5d of the driven member 5 comes to face the protrusion 19b of the contact holder 19, and the protrusion 19b projects into the recess 5d and is pressed into contact with the recess 5d. On the other hand, the protruding portion 18b of the contact holder 18 is pressed against the maximum diameter portion of the driven member 5. Therefore, in the section where the protrusion 19b of the contact holder 19 is pressed against the recess 5d, only the left contact 1aL of the rotation direction detection sensor 1 is turned on.

In this case, the turn switch 32 is connected to the left contact 35.
Since the power is turned on and the right contact 1aR is turned off, the power source 41 is not supplied to the rotational direction detection sensor 1.

When the steering wheel 13 is further rotated to the left from the state shown in FIG. 7, and the rotating member 3 and the driven member 5 are rotated in the direction of arrow F, the protrusion 19 of the contact holder 19 as shown in FIG.
b is the slide member 25 at the maximum diameter part of the driven member 5.
The projections 25b are pressed against the maximum diameter portion of the disc portion 3d of the rotating member 3, respectively. Further, the protrusion 18b of the contact holder 18 comes to face the recess 5d of the driven member 5, but the shoulder 18a is in contact with the flange 25a of the slide member 25, preventing it from entering the recess 5d. ing. Therefore, in the state shown in FIG. 8, the left and right contacts 1aL and 1aR of the rotational direction detection sensor 1 are both OFF.

After completing the left direction change, turn the steering wheel 1
3 in the right direction, only the right contact 1aR becomes ON for a certain period of time, as explained in FIG. At the same time, the power supply 41 passes through the left contact 35 and the right contact 1aR, is supplied to the solenoid drive circuit 36, and is supplied to the flasher circuit 38 as in the case of clockwise rotation.
The power supply 41 is cut off and the left indicator light 40 is turned off.

[Effect of idea]

As mentioned above, according to the present invention, the direction of rotation can be detected simply by sliding the contact holders of the pair of switch means in the axial direction, so that there are very few sliding parts and a good connection is always maintained. Reliability is improved, and the space in the diametrical direction can be reduced, making it possible to make the device compact. Furthermore, since the contacts between the input and output are configured as two-point contacts, contact resistance is reduced and durability is improved.

[Brief explanation of the drawing]

The drawings relate to an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view of a rotational direction detection sensor, FIG. 2 is a cross-sectional view taken along the - arrow in FIG.
The figure shows a direction indicating circuit using the sensor of the present invention.
The figures are longitudinal sectional views of the switch means, Figures 5 and 6.
The figure is an explanatory diagram of the operation when rotating to the right, and FIGS. 7 and 8 are explanatory diagrams of the operation when rotating to the left. 1...Rotation direction detection sensor, 3...Rotating member,
3f, 3g... recess, 5... driven member, 5d, 5
e... Recessed portion, 6, 8... Switch means, 9... Switch inhibiting means, 13... Steering wheel which is a rotating body.

Claims (1)

[Scope of utility model registration request] A rotating body, a rotating member that rotates together with the rotating body and has a recess formed on its outer peripheral surface, and a driven member that rotates in the same direction with a certain angle delay as the rotating member rotates and has a recess formed on its outer peripheral surface. , a pair of switch means that slides along the outer circumferential surface of the driven member when the driven member rotates to open and close contacts; A rotation direction detection sensor provided with a switch prohibiting means for selectively prohibiting opening and closing of the pair of switch means at a position other than the recessed portion of the outer circumferential surface depending on the rotation direction of the body.