JP2002178940A - Motor holding structure for steering - Google Patents

Abstract

(57) [Summary] (with correction) [Problem] A steering wheel moves to the driver side after peripheral components such as a brake pedal move to the rear of the vehicle and the peripheral components interfere with a motor held on a steering column. Provided is a steering motor holding structure that prevents the motor from being damaged. A motor (1) for electric assist includes a collar (14) and a bush (1) at two fastening portions by large-diameter bolts (13).
The large-diameter bolt 13 is passed through the collar 14 while the press-fitted part 5 is sandwiched between the actuator part 12 having a perforated hole and the bush-compatible motor bracket 23 integrated with the motor 1 for electric assist, and the washer 16 is inserted. And fixed with a nut 17. On the other hand, small-diameter bolt 1
Numeral 9 directly fixes the main body of the motor 1 for electric assist to the actuator 12 by being screwed into a threaded fastening portion of the actuator 12. Further, at the fastening portion on the lower side of the vehicle of the bush corresponding motor bracket 23, an opening is provided in the vehicle forward direction with respect to the hole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering motor holding structure in which a motor for generating a steering torque is provided on a steering column.

[0002]

2. Description of the Related Art Conventionally, an assist motor for assisting a steering torque used in an electric power steering apparatus or the like is sometimes held on a steering column in a small car or a light car having no room in an engine room. The holding structure fixes the motor to the steering column with a plurality of fixing members such as bolts.

[0003]

However, in the above-described holding structure, in the event of a frontal collision of the vehicle, peripheral components such as a brake pedal located near the steering column move rearward of the vehicle, and are moved to the steering column. In order to prevent the force from being transmitted to the steering member via the steering column and causing the steering wheel to move to the driver side when the motor interferes with the fixed assist motor, the steering column must be It is desirable that the layout is such that the peripheral components such as the brake pedal located in the vicinity move rearward of the vehicle so that the peripheral components do not interfere with the motor fixed to the steering column. Considering the operability of the pedal, the layout that is established is largely restricted. If the above-mentioned peripheral parts still interfere with the motor even after the layout is restricted, measures such as installing a new energy absorbing structure on the column side bracket that holds the steering column to the vehicle body or on the vehicle body side bracket Is required. However, in this case, a problem of an increase in cost and weight occurs due to the countermeasure.

[0004] In view of the above-mentioned problems of the prior art, the present invention provides a method for controlling a motor held on a steering column even when peripheral components such as a brake pedal move rearward of a vehicle. An object of the present invention is to provide a steering motor holding structure that prevents a motor from moving rearward so that no force is transmitted to a steering column and prevents a steering wheel from moving toward a driver.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a motor holding mechanism for a steering column which holds a motor for generating a steering torque in response to a driver's steering torque. In structure
The motor has an attaching portion for attaching the motor to the steering column, the attaching portion is attached to the steering column via two first fixing members via an elastic body, and the first fixing member The motor is attached to the steering column by a second fixing member on the front side in the vehicle front-rear direction with respect to the vehicle front-rear direction of one of the insertion holes through which the first fixing member of the mounting portion is inserted. An open portion is provided in the opening.

According to a second aspect of the present invention, there is provided a steering motor holding structure for holding a motor for generating a steering torque in response to a driver's steering torque on a steering column, wherein the motor is mounted on the steering column. An attachment portion, the attachment portion being attached to the steering column by two first fixing members, and being stronger than the first fixing member on the front side in the vehicle front-rear direction with respect to the first fixing member. The motor is attached to the steering column by the small second fixing member, and an opening is provided on the front side in the vehicle front-rear direction of one of the insertion holes of the attachment portion through which the first fixing member is inserted. It is characterized by having.

According to a third aspect of the present invention, in the steering motor holding structure according to the second aspect, the two first fixing members are attached to the steering column via an elastic body. Is what you do.

[0008] The invention of claim 4 is the first to third aspects of the present invention.
In the motor holding structure for a steering according to any one of the above, the second fixing member has a through hole in which the opening portion is not provided among the insertion holes of the mounting portion through which the two first fixing members pass. It is characterized by being located on the side close to the insertion hole.

The invention according to claim 5 is the invention according to claims 1 to 4.
The torque transmitting member for transmitting a torque generated by the motor to a reduction mechanism disposed around a rotation axis of a steering column rotatably supported inside the steering column. An external force is applied to the motor in a direction substantially perpendicular to the direction in which the first fixing member is inserted, such that the opening of the insertion hole provided in the mounting portion is removed from the first fixing member. In this case, the torque transmitting member stops transmitting the torque.

[0010] The invention of claim 6 is the invention of claims 1 to 5.
In the motor holding structure for a steering described in the above, the opening portion of the insertion hole provided in the mounting portion is widened at the opening side end.

[0011]

According to the first aspect of the invention, in the event of a frontal collision of the vehicle, peripheral components such as a brake pedal located near the steering column move rearward of the vehicle,
Immediately after the motor interferes with the motor held by the first fixing member and the second fixing member such as bolts, the motor receives an external force behind the vehicle. At this time, no force acts on the first fixing member via the elastic body due to the bending allowance of the elastic body, and the force acts intensively on the second fixing member. The second fixing member breaks. Thereafter, the opening provided on the front side in the vehicle front-rear direction of the insertion hole of the mounting member of the motor is removed from the first fixing member, so that the motor is centered on the first fixing member inserted through the other insertion hole of the mounting portion. As a result, the transmission of the force to the steering column is interrupted by moving to the rear of the vehicle, so that the steering wheel can be prevented from moving to the driver side. Therefore, safety can be ensured without being restricted by the layout of the peripheral parts and the motor, and the cost and weight increase due to the addition of the energy absorbing structure can be eliminated.

According to the second aspect of the present invention, the strength of the second fixing member is reduced so that the fixing member is broken, and the transmission of force is cut off as in the case of the first aspect, so that the steering wheel operates. Moving to the user side can be prevented. According to the invention according to claim 3, in addition to the effect of claim 2, by fixing the first fixing member via an elastic body such as rubber, the force is concentrated on the second fixing member. Therefore, the fixing member is easily broken, and the motor is more easily moved to the rear of the vehicle.

[0013] According to the invention of claim 4, claims 1 to
In addition to the effect of 3, by bringing the second fixing member closer to the insertion hole on the side where the opening of the mounting portion is not provided, the second fixing member receives external force intensively and breaks, By the external force, the moment generated around the first fixing member passing through the insertion hole is reduced as much as possible by shortening the moment span, and the damage such as deformation around the first fixing member or the insertion hole is reduced. By doing so, the motor can be moved more smoothly to the rear of the vehicle.

According to the invention of claim 5, claims 1 to 1
In addition to the effect of 4, when the motor moves to the rear of the vehicle, a transmission member such as a torque tube is removed from the rotation shaft of the motor so as to stop transmission of torque to the reduction mechanism,
Breaking makes it easier for the motor to move to the rear of the vehicle. Further, the motor is rotated rearward around the vehicle around the first fixing member inserted through the insertion hole where the opening of the mounting portion is not provided, so that the motor fits into the instrument and the driver operates the steering wheel. It is possible to prevent the driver's thigh from being injured by the motor and the mounting portion in the secondary collision of the vehicle pushing the wheel forward.

According to the invention according to claim 6, claims 1 to 1 are provided.
In addition to the effect of the fifth aspect, by expanding the open end of the open portion of the motor mounting portion, the open portion can be easily pulled out without being caught by the first fixing member or the elastic body.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a side view of a vehicle showing an on-vehicle state of the entire steering device. In FIG. 1, 1 is a motor for electric assist, 2 is a brake pedal (peripheral parts), 3
Is the steering column, 4 is the steering wheel, 5
Is a steering gear, 6 is a dash panel, 7 is a cowl, 8 is a steering member, 9 is a steering lower bracket, 10 is a steering upper bracket,
11 is a steering bracket, 21 is a connection bracket. The motor 1 for electric assist is a motor that assists the steering gear 5 even if it is assisted by another power assist mechanism by hydraulic assist or the like. It may be a motor that performs the operation. As shown in FIG. 1, the steering column 3 is fixed to the vehicle body by bolting or the like so that the front side of the vehicle is hung on the steering lower bracket 9 and the rear side of the vehicle is hung on the steering upper bracket 10. Here, the steering lower bracket 9 and the steering upper bracket 10 are respectively fixed to the vehicle body as follows. The steering lower bracket 9 is fixed to the steering bracket 11 by welding or the like to be integrated, and is fixed to the cowl 7 of the vehicle body. The steering upper bracket 10 is fixed to the connection bracket 21 extending to the steering bracket 11 by welding or the like. The connection bracket 21 is fixed to the integrated steering member 8 and is fixed to the vehicle body by being held by the steering bracket 11 with bolts or the like.

When the vehicle receives an external force due to a frontal collision, the dash panel 6 retreats, so that the external force F shown acts on the brake pedal 2, and the brake pedal 2 is moved from the position before the solid line collision to the broken line collision. Try to move to a later position. When the motor 1 for electric assist is arranged on the steering column, the motor 1 for electric assist protrudes in the lateral direction of the vehicle, and the brake pedal 2
In many cases, the necessary gap in the horizontal direction cannot be secured,
The brake pedal 2 retreats, deforms the steering member 8 backward while interfering with the electric assist motor 1, and retreats the steering wheel 4 mounted on the rotating shaft of the steering column 3. Therefore, the present invention is characterized in that the above problem is solved by holding the electric assist motor 1 as shown in FIG. 2 or FIG. 4, for example.

FIG. 2 is a view showing a first embodiment of a holding structure of the motor 1 for electric assist. In FIG. 2, 12
Denotes an actuator unit (reduction mechanism unit), 13 denotes a large-diameter bolt (first fixing member), 14 denotes a collar, 15 denotes a bush (elastic body), 16 denotes a washer, 17 denotes a nut, and 18 denotes a torque tube (torque transmitting member). ) And 19 are small-diameter bolts (second fixing members), 23 is a motor bracket corresponding to a bush, and 25 is a bush for vibration isolation. The motor 1 for electric assist integrated with the bush-compatible motor bracket 23 is configured such that the actuator part 1 is fastened by a total of three bolts, two large-diameter bolts 13 and one small-diameter bolt 19.
2 is held. In the fastening portion using the large-diameter bolt 13, the collar 14 is press-fitted into the bush 15 and the large-diameter bolt 13 is collared with the fastening portion sandwiched between the actuator portion 12 having a hole and the bush-compatible motor bracket 23 as shown in the figure. Washer 1 through 14
6 is fixed with a nut 17. On the other hand, the small-diameter bolt 19, whose shaft diameter is smaller than that of the large-diameter bolt 13 (about two steps in nominal diameter), is screwed into a fastening portion of the threaded actuator section 12 to thereby provide the motor 1 for electric assist. The main body is directly fixed to the actuator section 12. Further, at the fastening portion on the lower side of the vehicle of the bush corresponding motor bracket 23, an opening is provided in the vehicle forward direction with respect to the hole. The rotation axis of the motor 1 for electric assist is connected to the actuator 12 by a torque tube 18.
Is connected to the rotary shaft of the motor to transmit torque.

When the vehicle is subjected to a frontal collision, the brake pedal 2 interferes with the motor 1 for electric assist, and when the motor 1 receives an external force F shown from the brake pedal 2, the motor 1 attempts to move to the rear of the vehicle. I do. In the fastening portion using the two large diameter bolts 13, the external force F does not act on the large diameter bolt 13 while the elastic bush 15 is bent by the external force F. However, small diameter bolt 1
9 is directly fixed without the interposition of the bush 15 as described above, so that only a small diameter bolt 19 receives all the external force F while the bush 15 is slightly bent. As a result, the small diameter bolt 19 Breaks in situations where it is prone to break.
Here, the position of the small diameter bolt 19 is 3
In consideration of the fastening balance of the parts, it is assumed that the small-diameter bolt 1
Bush compatible motor bracket 23 before 9 is broken
In order to reduce damage such as deformation around the large-diameter bolt 13 or around the fastening portion hole, the moment generated around the fastening portion on the upper side of the vehicle is made as much as possible above the motor horizontal plane.

After the small-diameter bolt 19 is broken, an open portion provided in the vehicle front direction at the fastening portion on the vehicle lower side of the bush-compatible motor bracket 23 is written in FIG. 3 showing the operation of the first embodiment. An opening provided in the vehicle front direction with the fastening portion on the vehicle upper side of the bush-compatible motor bracket 23 as a rotation center is integrated with the large-diameter bolt 13, the collar 14, the bush 15, the washer 16, The nut 17 is left behind, leaving the nut 17 behind. At this time,
If the open end of the open portion is widened at the time of C as shown in FIG. 2, the bush 15 can be more easily pulled out without being caught at the open end. After this point, the external force F
Is shut off to prevent the steering wheel 4 from moving toward the driver.

Thereafter, the torque tube 1 shown in FIG.
8, the rotating shaft of the motor 1 for electric assist comes off,
When the torque tube 18 is broken, the motor 1 for the electric assist in which the bush-compatible motor bracket 23 is integrated as shown in FIG. 3 largely moves rearward in the rotational direction of the vehicle. Therefore, if the instrument cover 20 is disposed in the vicinity of the rear of the motor 1 for electric assist, the motor is accommodated in the instrument cover 20 and the driver pushes the steering wheel 4 forward in a secondary collision of the vehicle. It is also possible to prevent the thigh from being injured by hitting the motor 1 for electric assist.

FIG. 4 is a view showing a second embodiment of the holding structure of the motor 1 for electric assist. In FIG.
Is a bolt with a washer, and 24 is a bushless compatible motor bracket. The difference from the first embodiment is that the motor 1 for electric assist is fixed to the actuator 12 in a state where the elastic bush 15 is not provided in all three fastening portions. In FIG. 4, the bolt 22 with a washer is used in place of the large-diameter bolt 13, but the washer may naturally be a separate body. Due to the external force F, the bush 1
5 bolts with washer 2
Since two and one small-diameter bolts 19 receive the external force F at the same time, each bolt receives a component force. At this time, if the positions of the three bolts are arranged in a well-balanced manner to some extent, the component forces become substantially equal, and as a result, the small-diameter bolt 19 breaks first, and then the electric motor is driven in the same manner as in the first embodiment. The assist motor 1 moves backward.

[Brief description of the drawings]

FIG. 1 is a vehicle side view showing a vehicle-mounted state of an entire steering device according to an embodiment of the present invention.

FIG. 2 is a view showing a first embodiment of a holding structure of a motor 1 for electric assist.

FIG. 3 is a partially enlarged view showing an operation state of the first embodiment (a movement state of the motor 1 for electric assist) as viewed from the side of the vehicle.

FIG. 4 is a view showing a second embodiment of the holding structure of the motor 1 for electric assist.

[Explanation of symbols]

 Reference Signs List 1 motor for electric assist (motor) 2 brake pedal (peripheral parts) 3 steering column 4 steering wheel 5 steering gear 6 dash panel 7 cowl 8 steering member 9 steering lower bracket 10 steering upper bracket 11 steering bracket 12 actuator (deceleration mechanism) ) 13 Large diameter bolt (first fixing member) 14 Collar 15 Bush (elastic body) 16 Washer 17 Nut 18 Torque tube (Torque transmission member) 19 Small diameter bolt (Second fixing member) 20 Instrument cover 21 Connection bracket 22 Washer Bolt (first fixing member) 23 motor bracket for bushing 24 motor bracket for bushless 25 bush for vibration isolation

Claims (6)

[Claims] 1. A steering motor holding structure for holding, on a steering column, a motor for generating a steering torque in response to a driver's steering torque, wherein the motor has a mounting portion for attaching the motor to the steering column. The attachment portion is attached to the steering column via an elastic body by two first fixing members, and the motor is provided by a second fixing member on the front side in the vehicle front-rear direction with respect to the first fixing member. A motor holding structure for a steering wheel, wherein an opening is provided on a front side in a vehicle front-rear direction of one of the insertion holes, which is attached to the steering column and through which the first fixing member of the attachment portion is inserted. . 2. A steering motor holding structure for holding, on a steering column, a motor that generates steering torque in response to a driver's steering torque, wherein the motor has a mounting portion for attaching the motor to the steering column. The attachment portion is attached to the steering column by two first fixing members, and
The motor is attached to the steering column by a second fixing member having a smaller strength than the first fixing member on the vehicle front-rear direction front side with respect to the first fixing member, and the first fixing member of the attaching portion is provided. A motor holding structure for a steering wheel, characterized in that an opening is provided on the front side in the vehicle front-rear direction of one of the insertion holes through which the vehicle is inserted. 3. The steering motor holding structure according to claim 2, wherein the two first fixing members are attached to the steering column via an elastic body. Construction. 4. The steering motor holding structure according to claim 1, wherein the second fixing member is an insertion hole of the mounting portion through which the two first fixing members are inserted. A motor holding structure for a steering wheel, wherein the motor holding structure is located on the side closer to the insertion hole where the opening is not provided. 5. A steering motor holding structure according to claim 1, wherein the torque generated by the motor is rotatably supported inside the steering column. An external force that has a torque transmitting member that transmits to a reduction mechanism portion disposed around the opening portion of the insertion hole provided in the attachment portion from the first fixing member, with respect to the motor, A motor holding structure for a steering wheel, wherein the torque transmitting member stops transmitting the torque when applied in a direction substantially orthogonal to the insertion direction of the first fixing member. 6. The steering motor holding structure according to claim 1, wherein an opening of the insertion hole provided in the mounting portion is widened at an open end. Motor holding structure.