JPH0678063B2 - Electric tilt steering device - Google Patents

Description

The present invention relates to an electric tilt steering device.

[Conventional technology]

It is desirable that the steering wheel of the vehicle is located at the driver's optimum driving position,
For this reason, a tilt steering device that tilts a steering wheel in the vertical direction is widely used. There are two types of this type of tilt steering device, a manual type and an electric type. In the former, the base of the tilt bracket is tightened to the mounting bracket with a tightening screw equipped with a handle to hold the desired angle. The latter is the one in which the rotary motion of the electric motor is changed into the linear motion by the engagement of the male screw and the female screw to tilt the tilt bracket (for example, Japanese Patent Laid-Open No. 59-230861).

On the other hand, when the steering wheel is set to the driver's optimum driving position, when the driver gets on and off,
The knees and abdomen may hit the steering wheel and cause obstacles.To prevent this, it is also known to provide a so-called flip-up device that causes the steering wheel to rotate upward when the driver gets on and off the vehicle. A steering column having a tilt steering device and a flip-up device is known (for example, Japanese Patent Laid-Open No. 60-88680).
issue).

By the way, a steer rig column having a splashing device and an electric tilt steering device is not known yet.
In the case of an electric tilt steering device, since the steering wheel can be rotated upward by an electric motor, the steering wheel can be relatively easily rotated upward by operating the switch when the flip-up operation is necessary. Because you can.

[Problems to be solved by the invention]

However, according to the electric tilt steering device,
When the steering wheel splashing operation is required, the steering wheel tilts in the same slow movement as the optimal driving position adjusting operation, which takes time and is not suitable for the purpose of improving the entry / exitability. In addition, even if it is possible to prevent the obstacle at the time of getting on and off by turning the steering wheel once upward, it is necessary to adjust the optimum driving position of the steering wheel when the operation is restarted. Therefore,
The driver has to adjust the optimum driving position of the steering wheel every time he / she gets in and out of the vehicle.

Moreover, since the conventional electric tilt steering device drives the electric motor to rotate forward and backward to rotate the tilt bracket upward or downward, an electrical configuration for switching the rotation of the electric motor between forward and reverse, that is, a control circuit, a switch or It requires a relay and has a complicated configuration. for that reason,
Even if a memory structure that can return to the optimum driving position after the splashing operation is adopted, the structure is extremely complicated, and it is not practical in terms of maintenance and cost. Moreover, when the memory structure is adopted and the structure is complicated, it is expected that the setting of the optimum driving position and the flipping operation will become complicated, and that it is necessary to manually operate a plurality of switches. There is a risk of lack of stability.

[Means for solving problems]

The present invention is to solve the above-mentioned problems all at once. In a tilt steering device in which a tilt bracket pivotally supported by a mounting bracket and rotatably urged in a flip-up direction via an ammunition, An electric motor is fixed to the bracket, an eccentric shaft is provided for eccentric rotation by the electric motor, and one end of the link is pivotally attached to the eccentric shaft, and the other end has a long hole through which a pin protruding from the tilt bracket is inserted. 2 provided in the longitudinal direction and the width direction
And a cam for pivoting the link against the urging force of the ammunition, and a cam for flipping the cam. A drive means is provided for rotating when necessary, and the drive means is provided with a lock means for rotating the cam simultaneously with the cam so as to engage a part of the tilt bracket during the flip-up operation to fix the tilt bracket in a non-rotatable manner. While the drive means is in a door open operation state, a shift lever neutral or parking operation detection state or a handbrake operation state, and the drive means is operated at the optimum driving position of the steering wheel, The drive means is operated when the driver is seated on the seat in the closing operation state and the steering wheel is in the lifted state. Ruhaneage control circuit, as well as to provide an electric tilt steering device having a tilt position control circuit for starting the electric motor when put Chirutosuitsuchi in the closed state and the vehicle speed zero detection state ignition Tsu Chillon Sui Tutsi.

[Action]

According to the above configuration of the present invention, it is possible to adjust the optimum driving position of the steering wheel by electric power, as well as to perform the flip-up operation, and moreover, to adjust the optimum steering position of the steering wheel without re-adjustment after releasing the flip-up operation. In addition to being able to return to the position, it is possible to perform a flip-up operation in conjunction with the opening / closing operation of the door, a lock in the flip-up state, and release of the lock.

〔Example〕

 The present invention will be described below based on an embodiment shown in the drawings.

FIG. 1 is a side view, in which 1 is a mounting bracket, 2 is a tilt bracket pivotally supported on a mounting bracket 1 via a tilt hinge 3,
Reference numeral 4 is an upper tube fixed to the tilt bracket 2, 5 is an upper shaft penetrated by the upper tube 4, and 6 is a steering wheel fixed to the upper end of the upper shaft 5. The upper shaft 5 is connected to a lower shaft 5a penetrating the lower tube 4a through a universal joint (not shown) in the bending portion between the mounting bracket 1 and the tilt bracket 2. Also, between the mounting bracket 1 and the tilt bracket 2,
An ammunition machine 9 including a coil spring 7 and a wire 8 is connected to the tilt bracket 2 so that the tilt bracket 2 is biased to rotate upward about a tilt hinge 3.

On the other hand, the electric motor 10 is fixed to the side wall of the mounting bracket 1 and the eccentric shaft 13 is attached to the output wheel 12 of the speed reducer 11.
To provide. One end of a link 14 is pivotally attached to the eccentric shaft 13, and the other end of the link 14 is connected to a pin 15 protruding from the lower portion of the tilt bracket 2 through a long hole 16. The long hole 16 is bent in a substantially V shape to form a slide portion 16a and a lock portion 16b, and the link 14 can be moved in two directions of its longitudinal direction and width direction. A spring 17 such as a coil spring is provided between the link 14 and the mounting bracket 1, and the link 14 has a lock portion 16b of a long hole 16.
A biasing force is applied in the engagement direction of the pin 15 and the pin 15, that is, in the flip-up direction. Further, a cam 18 in contact with the link 14 is rotatably supported about the tilt hinge 3 as a shaft, and one end of the wire 19 is cammed to rotate the cam 18 clockwise in the drawing.
18 and the other end of the wire 19 is connected to the plunger 20a of the solenoid 20. The solenoid 20 is fixed to the side wall of the mounting bracket 1 and is a driving means for pulling the wire 19 by a predetermined length by its electromagnetic drive.

Further, the pin 15 of the tilt bracket 2 extends in the depth direction of the drawing and is fixed by penetrating the facing side wall. Therefore, the mounting bracket 1 has a circular arc hole 2 so that the pin 15 can move as the tilt bracket 2 rotates.
1,21 are formed. On the other hand, a locking means 22 for engaging and disengaging the pin 15 is provided in the mounting bracket 1. As shown in FIG. 3, the locking means 22 fixes a shaft 23 to the inner wall of the mounting bracket 1 and pivotally supports a lever 24 having a hook portion 24a on the shaft 23.
Further, a spring 25 for biasing the lever 24 to rotate clockwise in the drawing is wound around the lever 24, while one end of a wire 26 for rotating the lever 24 counterclockwise in the drawing against the force of the spring 25 is attached. It will be connected. The other end of the wire 26 extends to the outside from a through hole 1a formed in the mounting bracket 1 and is connected to the plunger 20a of the solenoid 20 together with the wire 19. The solenoid 20 may be replaced with an electric motor.

A detailed exploded view of the above configuration is shown in FIG.
As shown in the figure, a worm wheel 27 is used for the speed reducer 11, and a worm 28 engaging with the worm wheel 27 is used as an output shaft of the electric motor 10.

Next, the flip-up control circuit and tilt position control circuit of the present invention will be described with reference to FIG. In the figure, 30
Is an automobile battery, 31 is an ignition switch,
Reference numeral 32 is a tilt switch, 33 is a relay, and 34 is a vehicle speed zero detection switch, which comprises, for example, a micro switch that opens when the needle of the speedometer starts to rotate. The numeral 35 is a door switch, which is provided at the root of the door or the like and uses a switch for blinking the room lamp. Reference numeral 36 is a switch for detecting the neutral or parking state of the speed change lever, and 37 is a switch for detecting the handbrake operation state. 38 is a switch embedded in the seat and closes when the driver sits down. Reference numeral 39 is a lock switch for detecting the optimum driving position of the steering wheel 6 and the spring-up state. Specifically, two micro switches for detecting the tilting of the pin 15 of the tilt bracket 2 are fixed in the mounting bracket. However, when the steering wheel is flipped up, the micro switch on the seat switch 38 side is closed. 40 is a diode for extinguishing the counter electromotive force generated in the solenoid 20. That is, this control circuit starts the electric motor 10 when the tilt switch 32 is turned on in the closing state of the ignition switch 31 and the vehicle speed zero detection state, while one of the switches 36 and 37 or the seat switch 38 is activated. When the door switch 35 is closed and the solenoid switch 20 is closed, the solenoid 20 operates.

Next, the operation of the above embodiment will be described.

First, the operation of setting the steering wheel 6 to the optimum driving position for the driver will be described.

In the state shown in FIG. 4, that is, the tilt bracket 2 is in the operating position (shown by the solid line), in order to start the electric motor 10, the tilt switch 32 shown in FIG. 6 is turned on and the electric motor 10 is rotationally driven. Then, the worm 28 turns and the worm wheel 27 rotates. The output wheel 12 is rotated by the rotation of the worm wheel 27, and the eccentric shaft 13 is cranked. The crank movement of the eccentric shaft 13 causes one end of the link 14 to rotate along the rotation locus of the eccentric shaft 13, and the link 14 swings left and right and up and down in the drawing. At this time, the link 14 is the fourth
As shown in the figure, the cam 18 rotates counterclockwise as shown,
Since it is not in contact with the link 14, it is rotated counterclockwise by the urging force of the spring 17, and the pin of the tilt bracket 2 is rotated.
15 has fallen into the lock portion 16b of the long hole 16 of the link 14. Therefore, the tilt bracket 2 rotates about the tilt hinge 3 as the link 14 moves. That is, as long as the electric motor 10 is continuously driven, the link 14 swings and the tilt bracket 2 repeats the vertical reciprocating motion. This reciprocating movement is a worm 28 and a worm wheel 27.
The speed ratio can be set to either steep or steep depending on the tooth ratio, but it is needless to say that a relatively slow movement is more convenient for setting the optimum driving position. Thus, when the tilt bracket 2 rotates, the upper tube 4 tilts at a desired angle, and the steering wheel 6 reaches the optimum driving position, the tilt switch 32 is turned off. When the electric motor 10 stops driving, the link 14 is locked without moving due to the engagement between the worm 28 and the worm wheel 27, and therefore the tilt bracket 2 is locked without rotating, so that the steering wheel 6 The optimum driving position of is stably maintained.

Next, the splashing operation will be described. After the driver's optimum driving position shown in FIG. 4 is set as shown by the solid line, when the driver does not get off the vehicle, the hand brake or the vehicle speed switching lever is operated to the neutral or parking position to open the door. And solenoid 20 by the control circuit of FIG.
Operates again to pull the wire 19, which causes the cam 18 to rotate clockwise about the tilt hinge 3 as shown in FIG. The cam 18 contacts the link 14 and pushes it down, and the link 14 rotates clockwise about the eccentric shaft 13. Therefore, the link 14 moves the pin 15 in the long hole 16 to the slide portion 16a at the right end of the long hole 16. Then, when the pin 15 moves to the slide portion 16a of the long hole 16, the tilt bracket 2 becomes rotatable about the tilt hinge 3, and the tilt bracket 2 is flipped up by the biasing force of the bullet 9 ( (Fig. 5). On the other hand, the driving of the solenoid 20 causes the lever 24 to rotate counterclockwise at the same time as the cam 18, but this operation stops merely in conjunction, and the lever 24 returns to its original position by the force of the spring 25. When the lever 24 returns to its original position, the pin 15 of the tilt bracket 2 is in a position where it can be engaged with the hook portion 24a, so that the hook portions 24a and 15 are engaged and the tilt bracket 2 is fixed so that it cannot rotate. (Fig. 3).
At this time, the switch 39 in FIG. 6 is connected to the switch 38 side. Therefore, the driver can press the steering wheel 6 with his / her hand to support it when getting off the vehicle.

When the driver resumes driving, the optimal driving position that had been set before getting off the vehicle is maintained. That is, in the state of FIG. 5, when the door is closed to restart the operation and the driver sits on the seat, the switch 38 in the control circuit of FIG. 6 operates,
As a result, the solenoid 20 operates to pull the wire 19, and the cam 18 and the lever 24 simultaneously rotate in the clockwise and counterclockwise directions. The cam 18 contacts the link and pushes it down, while the hook 24a of the lever 24 separates from the pin 15. Therefore, the tilt bracket 2 is in a rotatable state.
Therefore, when the driver pushes the steering wheel 6 downward, the tilt bracket 2 is rotated clockwise about the tilt hinge 3. When the steering wheel 6 is pushed down as much as possible, the pin 15 of the tilt bracket 2 moves from the right end to the left end within the elongated hole 16 of the link 14. On the other hand, when the operation of the solenoid 20 is stopped, the cam 18 and the lever 24 are rotated counterclockwise and clockwise by the forces of the springs 17 and 25, respectively. Then, when the solenoid 20 stops operating and the cam 18 separates from the link 14, the force of the spring 17 causes the link 14 to rotate upward, which causes the pin 15 to lock the lock portion 16 of the slot 16.
drop into b. If the pin 15 engages with the lock portion 16b, the state is the initial optimum driving position that was set before restarting the operation. Because the position of the eccentric shaft 13 does not change at all even if the link 14 rotates about the eccentric shaft 13 during the flip-up operation, so that the link 14 is always ready to return to the initially set position. Because. Thus, when resuming driving, the optimum driving position initially set by the driver is mechanically memorized by the link 14, and the driver immediately drives the optimum driving position without troublesome readjustment. It is possible.

〔The invention's effect〕

According to the present invention described above, one end of the link is pivotally attached to the eccentric shaft which is cranked by the drive of the electric motor and the other end is pivotally attached to the tilt bracket, and the tilt bracket is vertically reciprocated through the tilt hinge. Therefore, the electric motor does not need to rotate forward and backward, and does not require a complicated control circuit, relay, switch, etc., and has a simple structure, excellent durability, and an electric tilt steering that does not cause maintenance problems. It is a device. Moreover, the link has a long hole integrally formed with a hole for fixing the pin of the tilt bracket and a hole for moving the pin, and the link is attached in the engaging direction of the lock part of the long hole and the pin, that is, the flip-up direction. Since a cam for urging and further pushing down the link against the urging force is provided and the control circuit for operating the cam by the driving means driven by the opening / closing operation of the door is provided, the automobile is changed from the running state to the stopped state. When the door is opened after the shift handbrake operation or the vehicle speed switching lever is operated to the neutral or parking range, the steering wheel is automatically flipped up and the state is locked. When the vehicle shifts from the stopped state to the running state, the steering wheel splashing and the locked state are still maintained when the driver opens the door, and the driver sits on the seat and closes the door. Since the steering wheel is unlocked only after it is operated, it is convenient because the steering wheel does not get in the way when the driver gets on or off, or it can be used as an auxiliary tool for getting on and off. In addition, the steering wheel is sufficiently safe so that it will not be lifted up when the handbrake is released or the shift lever is operated to a position other than neutral or the parking range. Even if you open and move backward, no flipping action will occur. Moreover, the optimum driving position of the steering wheel is set so that the electric motor operates only when the zero vehicle speed is detected.
It is safe because there is no danger of the steering wheel moving accidentally while the vehicle is running.

In addition, when restarting the driving, the lock of the steering wheel's splashing operation is automatically released, so if you push down the steering wheel you can return to the original optimum driving position, so that the optimum driving is restarted every time you restart the operation. No hassle of setting the position.

Thus, according to the present invention, by improving the function in use of the steering device of the automobile, the performance of the automobile is improved, the market needs thereof are increased, and it contributes greatly to the development of the automobile industry.

[Brief description of drawings]

The drawings show one embodiment of the present invention, in which FIG. 1 is a side view and FIG.
The figure is an exploded perspective view of the main part, FIG. 3 is a partial sectional side view, and FIG.
FIG. 5 and FIG. 5 are operation explanatory diagrams, and FIG. 6 is a control circuit diagram. 1 ... Mounting bracket, 2 ... Tilt bracket, 3 ... Tilt hinge, 6 ... Steering wheel, 9 ... Ammo, 10 ... Electric motor, 12 ... Output vehicle,
13 …… Eccentric shaft, 14 …… Link, 15 …… Pin, 16 …… Long hole, 17,25 …… Spring, 18 …… Cam, 20 …… Solenoid (driving means), 22 …… Locking means, 23 ...... Axis, 24 ...... Lever, 24a ...... Hook part, 31 ...... Ignition switch, 32 ...... Tilt switch, 33 …… Relay, 34 …… Vehicle speed zero detection switch, 35 …… Door switch, 36 …… Neutral or parking detection switch of the gear shift lever, 37 …… Brake operation detection switch, 38 …… Seat switch, 39 …… Lock switch.

Claims (2)

[Claims] 1. In a tilt steering device in which a tilt bracket pivotally supported by a mounting bracket and rotatable is biased in a flip-up direction via an ammunition, an electric motor is fixed to the mounting bracket, and the tilt motor is fixed by the electric motor. An eccentric shaft for eccentric rotation is provided, and one end of the link is rotatably attached to the eccentric shaft, and at the other end, a long hole through which a pin protruding from the tilt bracket is inserted is provided, and the long hole is provided in two directions, the longitudinal direction and the width direction. A munition that is movably attached to the link and that urges the link in the flip-up direction is provided, and a cam that rotates the link against the urging force of the bullet is provided and the cam must be flipped up. A drive means for rotating the tilt bracket is provided, and the drive means rotates the cam at the same time as the cam and engages with a part of the tilt bracket during a flip-up operation. At the optimum driving position of the steering wheel, the drive means is provided with a lock means for fixing it so as not to be rotatable, and the drive means is in a door open operation state, a shift lever neutral or parking operation detection state, or a handbrake operation state. An electric tilt having a flip-up control circuit for operating the drive means while operating the door when the driver is seated on the door and the steering wheel is in the flip-up state. Steering device. 2. The electric motor according to claim 1, wherein the electric motor has a tilt position control circuit which is started when the tilt switch is turned on when the ignition switch is turned on and when the vehicle speed is zero. Tilt steering device.