JPH048330Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an automobile steering wheel angle detection device that detects the direction of the front wheels whose direction is changed by the steering wheel and displays this on the driver's seat.

[Prior Art] Conventionally, when starting a car again after parking it, it is difficult to determine whether the steering wheel is in neutral or left or right, and the car may move in an unexpected direction when starting. This made driving difficult, and there was a risk of colliding with other vehicles.

[Purpose of the invention] The present invention has been made in view of the above points, and its purpose is to provide an automobile steering wheel angle detection device that can display the direction of the front wheels on the driver's seat.

[Summary of the invention] The invention provides a speed reduction device for decelerating the rotation of a cancell cam that rotates integrally with the steering wheel, and a first rack portion that meshes with a first pinion located at the final stage of this speed reduction device. a movable body that is moved according to the rotation of the first pinion, a second pinion that is rotated by manual operation, and a second rack that meshes with the second pinion; An elastic member is provided on the body and applies a moving force to the movable body so that the first and second rack portions mesh with the first and second pinions, and the movable body is moved by the second pinion. The first rack part is disengaged from the first pinion against the biasing force of the resilient member when the steering wheel is moved, and the direction of the steering wheel is adjusted to match the display by the movable body. It is characterized by the fact that it is made as follows.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a cancel cam which is rotated integrally with a steering wheel (not shown), which is provided with a cam ridge 1a on its outer circumference for self-cancelling a turn lever (not shown), and a flange 1 at the upper end.
A protruding portion 1c that engages with the steering wheel is provided on b. 2 is a gear formed on the outer periphery of the cancel cam 1. 3 is a case attached to the steering column and has one side open; 4 is a cover attached to the case 3 so as to close the open side of the case 3; Reference numeral 5 denotes a speed reduction device consisting of a plurality of sets of spur gears mounted inside the case 3, which consists of an idle gear 6 and gears 7 to 9, which are rotatably supported on the case 3 and the cover 4. Of these, the gears 7 and 8 are composed of large gears 7a, 8a and small gears 7b, 8b, and the gear 9 is a large gear 9a and a first gear which has a smaller diameter than the large gear 9a and is located at the final stage of the reduction gear 5. It consists of a pinion 10. Idle gear 6 is gear 2 and large gear 7.
The large gear 8a meshes with the small gear 7.
The large gear 9a meshes with the small gear 8b. Reference numeral 11 denotes a movable body made of plastic, for example, which is disposed within the case 3 so as to be able to move linearly in the direction of arrow A and the direction opposite to arrow A, and a first rack that engages with the first pinion 10 is provided on one end surface of this movable body. 12
is engraved. 13 is case 3 and cover 4
A reset wheel is rotatably supported on the reset wheel, and a second pinion 14 meshes with the reset wheel. A second rack 15 is carved on the end surface of the movable body 11 adjacent to the first rack portion 12, and the second pinion 14 is meshed with the second rack. On the other hand, 16 and 17
is a resin spring as a resilient member integrally molded and extended on the other end surface of the movable body 11, and each tip of the spring is in contact with an inner wall 18 provided on the case 3. Therefore, a moving force in the direction of arrow B is applied to the movable body 11 by the biasing force of the resin springs 16 and 17, and this moving force causes the first rack 12 to move.
and the second rack 15 are respectively connected to the first pinion 10.
and meshes with the second pinion 14. The shapes of the teeth of the first pinion 10 and the first rack 12 are formed so that the angle of the inclined surface is gentler than that of the teeth of the second pinion 14 and the second rack 15. A switch chamber 19 is formed on the opposite side of the movable body 11 across the upper wall portion 3a of the case 3, and a contact holder 20 that is moved integrally with the movable body 11 is provided here. Reference numeral 21 designates four movable contacts attached to the contact holder 20, the base ends of which are integrally connected. Reference numeral 22 denotes a spring attached between the contact holder 20 and the end plate portion 19a of the switch chamber 19, which urges the contact holder 20 and the movable body 11 in the direction of arrow A. 23 is a printed board attached to close the open surface of the switch chamber 19, and a movable contact 2 is mounted on the bottom surface of this printed board.
Fixed contacts 24 to 30, as shown in FIG. 3, are formed by printed wiring so as to face the contacts 1 and along the direction of movement thereof, as shown in FIG. Among these, the fixed contacts 25 and 26, the fixed contacts 27 and 28, and the fixed contacts 29 and 30 have their ends facing each other with a gap between them, and the gap is the same as that of the fixed contact 2.
5 and 26, 27 and 28, and 29 and 30. When the cancel cam 1 is in a neutral state, one of the movable contacts 21 is connected to the fixed contact 24 as shown by the two-dot chain line in FIG. The remaining three contacts are fixed contacts 25 and 26.
It is located at an intermediate position between fixed contacts 27 and 28 and between fixed contacts 29 and 30. And a movable contact 21 and a fixed contact 24
30 constitute a detection switch 31. Terminals 32 to 38 are formed at the side ends of the printed board 23 and are electrically connected to the fixed contacts 24 to 30, respectively, and the terminal 32 is connected to one terminal of a power source (not shown).
38 are connected to the other terminal of the power source via a light emitting diode 39 as a display.

Next, the operation of the above configuration will be explained. When the steering wheel is rotated clockwise (right turn direction) and the cancel cam 1 is rotated clockwise, the large gear 7a of the gear 7 is rotated through the gear 2 and the idle gear 6.
is rotated clockwise, this rotation is transmitted to the large gear 8a of the gear 8 via the small gear 7b, and the gear 8 is decelerated and rotated counterclockwise. The gear 9 is rotated clockwise by the transmission to the gear 9a, and the first pinion 10 is therefore rotated clockwise, so that the movable body 1
1 is moved in the direction opposite to the arrow A, and thereby the contact holder 20 and the movable contact 21 are moved in the direction opposite to the arrow A. Next, when the steering wheel is rotated counterclockwise (left turn direction) and the cancel cam 1 is rotated counterclockwise, the movable body 11 is moved along the arrow A through the deceleration device 5 along the same path as described above.
The contact holder 2 is moved in this direction.
0 and movable contact 21 are moved in the direction of arrow A. Therefore, when the steering wheel is rotated clockwise from the neutral position, the movable contact 2
1 is moved in the opposite direction of the arrow A as described above, the movable contact 21 eventually comes into contact with the fixed contact 26, and the terminals 32 and 34 are brought into conduction via the movable contact 21, and connected to the terminal 34. The light emitting diode 39 that has been set is turned on. When the steering wheel is further rotated clockwise, the movable contact 21 contacts the fixed contact 28, and the terminals 32, 34, 36
The two light emitting diodes 39 connected to the terminals 34 and 36 are lit because the terminals 34 and 36 are brought into conduction through the movable contact 21. When the steering wheel is rotated clockwise to the maximum angle, the movable contact 21 contacts the fixed contact 30 and the terminals 32, 34,
Terminals 34, 36, 38 are electrically connected via the movable contact 21.
Three light emitting diodes 39 connected to 38 are turned on. Contrary to the above, when the steering wheel is rotated counterclockwise, the movable contact 21 is sequentially rotated to the fixed contact 2 according to the rotation angle.
5, 27, 29 and between the terminal 32 and the terminals 33, 35, 37.
1, the light emitting diodes 39 connected to each terminal 33, 35, and 37 are turned on, and the rotation angle of the steering wheel is displayed. .

Now, when the steering wheel is held in a neutral state, the movable body 11 and the contact holder 2
0 and the movable contact 21 are in a neutral state, and the light emitting diodes 39 are both in a non-lighting state. However, if for some reason there is a deviation between the orientation of the steering wheel and the position of the movable body 11, even if the steering wheel is in a neutral state, light emitting diode 3
9 lights up, but the positional shift of the movable body 11 can be eliminated by manually rotating the reset wheel 13 while keeping the steering wheel in a neutral state. That is, when the reset wheel 13 is manually rotated, the second pinion 14 is rotated, and the rotation of the second pinion 14 is transmitted to the second rack 15. The teeth of the pinion 10 and the first rack 12 have the same shape as the second pinion 14.
Since the angle of the inclined surface is formed to be looser than the shape of the teeth of the second rack 15, when the second pinion 14 is rotated, the second pinion 14 and the second rack 15 are engaged with each other. However, the movable body 11 resists the biasing force of the resin spring 17 and moves in the direction opposite to arrow B.
The teeth of the first rack 12 come to ride over the teeth of the first pinion 10 while being displaced in the direction, so that even if the steering wheel is not rotated, the movable body 11 is moved in the direction of the arrow by rotation of the reset wheel 13. The movable body 11 is moved in the direction of arrow A or opposite to arrow A.
can be adjusted to match the orientation of the steering wheel.

According to the above embodiment, the movable body 11 is moved by decelerating the rotation of the cancel cam 1 by the speed reduction device 5, which is composed of a plurality of spur gears including an idle gear 6, a gear 7, a gear 8, and a gear 9. , this movable body 1
The movable contact 21 of the detection switch 31 is brought into contact with and separated from the fixed contacts 24 to 30 in accordance with the movement displacement of the light emitting diode 39. Since the direction of the front wheels is displayed based on the degree of lighting, the vehicle will not proceed in an unexpected direction when starting, and the risk of colliding with another vehicle will be prevented.

Incidentally, in the above configuration, while the deceleration device 5 is decelerating, the first rack 12 of the movable body 11 is urged in the direction of arrow A by the urging force of the spring 22, and the first pinion meshing with the first rack 12 is Since the meshing teeth of the speed reducer 5 are held in pressure contact with each other via the gear 10, variations in rotation angle due to backlash can be reduced.

The spring 22 may be provided as necessary, and the moving direction of the movable body 15 is not limited to linear movement as in the above embodiment, but may be moved in an arc, for example.

[Effects of the invention] As is clear from the above explanation, the present invention can display the direction of the front wheels on the driver's seat, making it possible to prevent the car from moving in an unexpected direction when starting, making driving operations easier. Furthermore, it is possible to provide a steering wheel angle detecting device for an automobile that exhibits an excellent effect in that even if a deviation occurs between the orientation of the front wheels and the display for some reason, the deviation can be resolved with a simple operation.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a plan view, FIG. 2 is a sectional view taken along the line - in FIG. 1, and FIG. 3 is a plan view of a printed board. In the drawing, 1 is a cancel cam, 5 is a reduction gear,
10 is a first pinion, 11 is a movable body, 12 is a first rack, 13 is a reset wheel, 14 is a second pinion, 15 is a second rack, 16 and 1
7 is a resin spring (elastic member), 31 is a detection switch,
39 is a light emitting diode.

Claims (1)

[Scope of utility model registration request] A cancel cam that rotates integrally with the steering wheel, a reduction gear made up of multiple sets of gears for decelerating the rotation of this cancellation cam, and a first rack that meshes with a first pinion located at the final stage of this reduction gear. a second pinion that is rotated by manual operation; and a second pinion that is provided on the movable body so as to mesh with the second pinion. a second rack portion, and a resilient member provided on the movable body and applying a moving force to the movable body so that the first and second rack portions mesh with the first and second pinions. and when the movable body is moved by the second pinion, the movable body is displaced against the biasing force of the elastic member so that the first rack portion An automobile steering wheel angle detection device characterized in that it is disengaged from a pinion.