JPS6387366A - Steering gear - Google Patents

Abstract

PURPOSE:To aim at the miniaturization and lightweightiness of a gear, by installing a clutch to be turned on or off by a selector motor, and making both tilt and telescopic operations performable with a single driving motor by means of selecting control over this clutch. CONSTITUTION:A lower main shaft 3 is pivotally supported on a fixed bracket 2 to be fixed to the car body side, and an upper main shaft 4 having a pivot point 5 is connected to this shaft 3 in a serration way. In addition, a first screw shaft 6 is pivotally supported on the fixed bracket 3, and a clutch 8 to be turned on or off by a selector motor 11 is installed at the one end side of this shaft 6. And, at the time of disengagement of this clutch 8 by the selector motor 11, the upper main shaft 4 is tilted by rotation of the first screw shaft 6 only, while at the time of engagement of the clutch 8, these first and second screw shafts 6 and 16 are equally rotated via gear trains 14-17, whereby telescopic operation is made so as to be done.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a steering device with improved mechanisms for tilting and telescopic operation of a steering wheel.

BACKGROUND OF THE INVENTION As disclosed in Japanese Patent Application Laid-Open No. 58-33569, a device that performs tilting and telescopic movements is well known.

A known steering device includes a breakaway bracket fixed to the vehicle body side, a lower main shaft having a pivot point supported by the breakaway bracket, an upper main shaft engaged with the lower main shaft through serrations, and an upper main shaft. The lower main shaft is provided with a first upper bracket for holding the lower main shaft and a second upper bracket for holding the lower main shaft above the pivot point. A first drive means for telescopically moving the first riser bracket is provided between the first riser bracket and the second riser bracket, and by operating the first drive means, the upper main shaft is moved. It is configured to move forward and backward relative to the lower main shaft. Further, between the second attachment bracket and the breakaway bracket, a second
A drive means is attached, and the first drive means, the upper main shaft, and the first and second upper brackets are connected to the lower main shaft and the break seven-way bracket,
The steering wheel is rotated around that pivot point to tilt the steering wheel.

Problems to be Solved by the Invention In the conventional steering device as described above, a driving means having an electric motor for tilting the steering wheel and a driving means having an electric motor for telescopically moving the steering wheel are separated and separated. and ground, and incorporates control circuits for the respective drive means.

Providing independent drive means in this way increases the size of the steering device and uses electric motors for each drive means, which inevitably increases costs.

Therefore, the present invention uses one electric motor for driving,
The problem to be solved is to eliminate the above-mentioned problems of the prior art by making part of the steering tilt and telescopic operation systems common.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention selectively connects a first screw shaft rotated by a drive motor to a second screw shaft via a rotational torque transmission system. Connected to the shaft, the switching means of the rotary torque transmission system is turned off according to the tilt original signal, and only the first screw shaft is rotated, and the switching means is turned on according to the telescopic pink operation instruction, and both screw shafts are rotated at the same time. use technical means to

Although only one driving motor is used, the rotation of the first screw shaft can be selectively transmitted to the second screw shaft. Two rotation systems are obtained: the rotation of the two screw shafts. Thus, one rotation system is used for tilt operation, and the other rotation system is used for telescopic operation.

The embodiment steering device 1 includes a breakaway bracket 2 fixed to the vehicle body side, and a lower main shaft 3 pivotally supported by the bracket 2. The lower main shaft 3 includes:
An upper main shaft 4 is serrated and has a pivot point 5.

A first screw shaft 6 is pivotally supported by a breakaway bracket 2. The serration portion 7 of the first screw shaft 6 is connected to one side 13 of the clutch 8, and the pin 9 of the one side 13 of the clutch 8 is slidably fitted into the groove of the nut 10. A screw 12 from a switching motor 11 bolts onto a nut 10. The rotation of the switching motor 11 moves the nut back and forth, thereby engaging and disengaging the clutch 8. When the clutch 8 is disengaged, rotation of the first screw shaft 6 rotates one of the clutches 13, but its pin 9
The nut 10 only rotates in the groove of the nut 10 and does not move the nut 10 forward or backward. The other side 14 of the clutch 8 is pivotally supported by the breakaway bracket 2, and its gear portion meshes with an idle gear 15 (see FIG. 5). This idle gear 1
5, when the second screw pivotally supported by the bracket 2 is turned on, the rotation of the first screw shaft 6 rotates the second screw shaft 16 via the idle gear 15 and the gear 17.

In the illustrated example, the rotational torque transmission system from the first screw shaft 6 to the second screw shaft 16 is a gear train, but a belt or the like may also be used.

Please refer to FIG. The rotation of the output shaft 18 of the drive electric motor (not shown) rotates the gear 20 coupled to the serration portion 7 of the first screw shaft 6 via the reduction mechanism 19 . Thus, the rotation of the motor rotates the first screw shaft 6, and if the clutch 8 is on, the second screw shaft 16 also rotates with the first screw shaft 6, but the clutch 8 When is in the off state, only the first screw shaft 6 rotates.

A first nut member 2 is attached to the first screw shaft 6.
1 are screwed together, and the nut member 21 is swingably connected to the upper placket 23 by a long bolt 22 passing through it. It should be noted that instead of being long, they may be connected via links. The upper placket 23 also supports a second nut member 24, which is screwed onto the second screw shaft 16, via a bearing. Pivot point 5 on the line connecting bolts 25
is located.

Next, the operation will be explained. When a tilt operation is instructed by a manual switch (not shown), the switching motor does not operate and the clutch 8 is turned off. Incidentally, if the clutch 8 is in the on state, it is immediately turned on. When the off state of the clutch 8 is confirmed, the drive electric motor is activated, rotates the first screw shaft 6, and rotates the first screw shaft 6 of the first nut member 21.
Tilt the steering wheel.

When the manual switch is used to instruct a telescopic pink operation of the steering wheel, the switching motor 11 is immediately activated in response to this instruction, and the clutch 8 is turned on. When the ON state of the clutch 8 is confirmed, the drive electric motor rotates, causing the first screw shaft 6 and the second screw shirt 16 to rotate simultaneously, and the first and second nut members 21 and 24 to be rotated. A co-linear movement along the shaft 6.16. The linear movement of these nut members 21, 24 moves the upper placket 23 and the upper main shaft 4 back and forth, allowing telescopic operation of the steering wheel.

The engagement and disengagement of the clutch 8 is performed by a switching motor, a cam member,
Alternatively, a combination of a solenoid and a nut member may be used.

Effects According to the present invention, each rotation system is selectively activated by a tilt operation or telescopic pink operation signal, and these operations are extremely easy.

[Brief explanation of the drawing]

FIG. 1 is a side view of an example of the present invention, FIG. 2 is a sectional view thereof,
Figure 3 is a sectional view taken from arrow I-1 in Figure 2, Figure 4 is a sectional view taken from arrow IV-IV in Figure 2, and the fifth
It is a sectional view taken along arrow V-V in the figure. shaft, 5... pivot point, 6.16...
Screw shaft, 8...Clutch, 11...Switching motor, 21.
24... Nando member. Agent Patent Attorney Hideaki Kuwahara Figure 5

Claims (1)

[Claims] A fixed bracket fixed to the vehicle body side, a lower main shaft pivotally supported by the fixed bracket, an upper main shaft that engages with the lower main shaft through serrations and has a pivot point, and a first shaft pivotally supported by the fixed bracket. a screw shaft, an upper bracket having a first nut part threadedly engaged with the first screw shaft and supporting the upper main shaft, and an upper bracket having a second nut part threadedly engaged with the second nut part of the upper bracket and said fixing member. A second screw shaft pivotally supported by a bracket, a driving means for rotating the first screw shaft, and a switching means for engaging and disengaging a rotational torque transmission system between the first screw shaft and the second screw shaft. and the first
and a second nut are pivotally connected to the upper bracket coaxially with the pivot point of the upper main shaft, and the other nut is swingably connected to the upper bracket and tilts. In response to an operation instruction, the switching means is turned off and the driving means is operated, only the first screw shaft rotates, and in response to a telescopic operation instruction, the switching means is turned on, and then the driving means is activated, and the driving means is turned on. A steering device characterized in that both the shafts are rotated at the same time by a chisel.