JPH02234011A - Fitting structure for steering sensor - Google Patents

Abstract

PURPOSE:To improve the fitting workability by allowing a second sensor body containing a potentiometer to stride over a steering column and fixing it to a position of the opposite side to a first sensor body. CONSTITUTION:A steering angle sensor use gear case 7 is screwed and fixed to a rotary steering speed sensor body 5 fixed to a steering column 4, and thereafter, in a state that a steering shaft 1 is set in a neutral position, a steering angle sensor body 10 of a potentiometer type in which a shaft 10a is set to an electrical midpoint is fitted and fixed with two pieces of bolts after setting such a relational position as screw hole positions of two pieces of bolts screwed to the steering angle sensor use gear case 7 come in the vicinity of the center of two pieces of slots provided on the body 10, and after bringing an intermediate axis 7a to serration coupling to the shaft 10a. In such a constitution, the rotary steering speed sensor body 5, the case 7 and the body 10 are attached compactly to a column 4.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a mounting structure for a steering sensor that detects the rotational angle and rotational speed of a steering wheel in an automobile or the like. 2. Description of the Related Art For example, in a four-wheel steering vehicle in which the rear wheels are steered in conjunction with the front wheel steering, the steering angle of the rear wheels is controlled in accordance with the steering angle of the front wheels. As shown in Fig. 4, the steering angle detection means includes a disc B having a plurality of slits S fixed to the steering shaft A, and a steering column etc. fixed so as to face each other across the disc B. The steering shaft consists of a combination of a light emitting element C and a light receiving element D attached to a side member, and the steering shaft is determined by the number of pulses of the light receiving element D received through the slit S.
A photoelectric rotary encoder that detects the rotation angle of A has conventionally been used (for example, Utility Model Application No. 59-1179l1
(Refer to the publication). Problems to be Solved by the Invention In the above, the rotational angular velocity of the steering shaft A can be determined by the number of pulses per unit time of the light receiving element D received through the slit S. In products where signals such as rotation angle and rotation angular velocity play a very important role, it is necessary to be able to detect sensor failure immediately.
To this end, it is common practice to provide a steering angle sensor and a steering speed sensor, or two steering angle sensors, independently. In this case, the mounting space for the above-mentioned sensor on the steering column that rotatably supports the steering shaft is likely to be large, and the sensor is attached to the steering shaft and steering column, which may cause the steering wheel to move in the event of a frontal collision. The problem is that it tends to interfere with the absorption stroke of the impact energy absorbing device that prevents it from protruding into the room. SUMMARY OF THE INVENTION An object of the present invention is to provide a steering sensor mounting structure that satisfies the problems of making the mounting space on a steering column compact and not interfering with the operation of an impact energy absorbing device mounted on the steering column. be. Means for Solving the Problems The present invention is attached to a steering shaft and held by a disc casing having disc-shaped side walls at both ends, and a plurality of slits or magnets arranged at equal intervals around the outer circumference of the disc casing. A light-emitting element and a light-receiving element are arranged facing each other across a disc having a detection part such as a magnetic part, or a synthetic resin-made part has a built-in detection part such as a reed switch placed close to a magnetic part of the disc. The sensor body of No. 1 is fixed to a steering column that rotatably supports a steering shaft using a fixing means such as a tapping screw, and the rotation of the steering shaft is fixed to a disc-shaped side wall of a disc casing attached to the steering shaft. A second sensor body containing a potentiometer that is transmitted by a gear that meshes with the gear part is fixed by means such as a mounting bolt so that it straddles the steering column and occupies a position on the opposite side of the first sensor. It is characterized in that the first sensor body is fixed to the first sensor body using a By adopting the above-described configuration, the present invention allows the rotary encoder type first sensor body and the potentiometer type second sensor body to be mounted on the steering column in a compact manner, thereby eliminating the need for the above-mentioned sensors. In addition to reducing the number of parts that need to be changed around the steering column for vehicle models that require this, the first sensor body made of synthetic resin can be tapped when a large force is applied between the steering shaft and the steering column, such as in the event of a frontal collision. Since the attachment part to the steering column by fixing means such as screws is broken, it is possible to prevent the absorption stroke of the shock absorbing device attached to the steering shaft and steering column from being hindered. Examples Examples of the present invention will be explained below with reference to the accompanying drawings. In Figs. 1 to 3, 1 is a steering shaft;
2 is a disc casing having disc-shaped side walls at both ends, and a gear portion 2a that meshes with a gear 9, which will be described later, is formed on the outer periphery of one of the side walls; This is a disk that is assembled to the steering shaft 1, and a plurality of slits (not shown) are provided at equal intervals around the entire circumference of the disk 3 near the outer periphery. 4 is a steering column that rotatably supports the steering shaft 1, and the steering column 4 has a light emitting element 5a and a light receiving element 5b made of synthetic resin and facing each other across the slit portion of the disk 3. The rotary encoder type steering speed sensor main body 5 is fixed using a tapping screw 6.6 or the like. As shown in FIG. 1, the portion secured by the tapping screw 6.6 is formed into a thin wall near the attachment portion of the steering angle sensor gear box 7, which will be described later. The fixed part is designed to break when excessive force is applied to it. The disk 3 and the disk casing 2 rotate together with the steering shaft l, and as the disk 3 rotates, the light emitting element 5a
Each time the light beam emitted passes through the light emitting element 5a, it passes through the slit and is received by the light receiving element 5b.This is converted into an electrical pulse, and the steering shirt is calculated from the number of electrical pulses per unit time. It is designed to detect the rotational angular velocity of 1. Mounting bolt 8.7 straddles the steering column 4 and occupies a position on the opposite side of the steering speed sensor main body 5.
A steering angle sensor gear case 8 is screwed and fixed to the steering speed sensor main body 5, and a screw 9 is fixed to the intermediate shaft 7a rotatably supported by the steering angle sensor gear case 7, and the disc casing. 10 is a potentiometer-type steering angle sensor main body having a sleeve-shaped shaft 10a connected to one end of the intermediate shaft 7a through serrations; As shown in Fig. 3, the main body IO has two arc-shaped elongated holes IG centered on the shaft 10a.
b, fob are provided, and two bolts that pass through the elongated holes 10b and 10b and are screwed to the gear case 7 for the steering angle sensor}11. 11 makes it possible to finely adjust the mounting angle of the steering angle sensor main body 10 to the steering angle sensor gear case 7 around the shaft }log, and to fix the two after the fine adjustment is completed. 1. The procedure for attaching the steering angle sensor main body lO to the steering angle sensor gear case 7 is as follows. That is, after the gear case 7 for the steering angle sensor is screwed and fixed to the turning speed sensor main body 5 fixed to the steering column 4, the shaft 1 is set at the neutral position with the steering shaft 1 set to the electrical midpoint using a potentiometer type. Rudder angle sensor body 10
The two elongated holes 10 provided in the steering angle sensor wooden body 10
The intermediate shaft 7a is positioned so that the screw holes of the two bolts 11 and 11 screwed to the gear case 7 for the steering angle sensor are located near the center of the gear case 7 for the steering angle sensor, and the intermediate shaft 7a is inserted into the sleeve-shaped shaft 10a. Seresi. After connecting the bolts, attach and secure with the two bolts 11.11. In addition, if you actually drive and discover that the neutral position of the steering shaft l does not match the electrical midpoint of the potentiometer-type steering angle sensor, please refer to the above-mentioned bolts.
, and finely adjust the mounting angle of the steering angle sensor main body 10 relative to the steering angle sensor gear case 7 around the rotation axis. By adopting the above configuration, the present invention allows the steering speed sensor main body 5, the steering angle sensor gear case 7, and the steering angle sensor main body 10 to be mounted on the steering column 4 in a compact manner, so that the above-mentioned sensors are not required. It is possible to reduce the number of changes to the parts, which is not only advantageous in terms of cost, but also improves the workability of installing the steering column and the ease of repair and maintenance of the vehicle. In addition, when a large force is applied between the steering shaft 1 and the steering column 4, such as in the event of a frontal collision, the steering speed sensor body 5 made of synthetic resin is fixed to the steering column 4 by means of fixing means such as a tapping screw 6. Since the attachment part is broken, it is possible to avoid interfering with the absorption stroke of the impact energy absorbing device (not shown) attached to the steering shirt and the steering column 4. Furthermore, the steering angle signal from the steering angle sensor is differentiated over time to obtain a steering speed signal, and compared with the steering speed signal from one steering speed sensor, or contrary to the above, the steering speed signal is By temporally integrating the steering speed signal from the speed sensor to obtain the steering angle signal, and comparing it with the steering angle signal from the other steering angle sensor, failure detection of both sensors can be ensured. In the above embodiment, the first sensor of the rotary encoder type is used as a turning speed sensor, but it is also possible to provide a slit or a magnet piece in the disc to indicate the neutral position and to detect the slit or magnet piece. It may be used as a steering angle sensor by providing a section, or it may be a magnetic rotary encoder using a magnetic piece instead of the slit and a reed switch or Hall element that detects the magnetic force from the magnet piece as a detection section. Of course. Effects of the Invention As described above, according to the present invention, the steering shaft is attached to the steering shaft and is held by a disc casing having disc-shaped side walls at both ends, and has a plurality of slits or slits arranged at equal intervals around the outer circumference of the disc casing. is made of synthetic resin and has a light emitting element and a light receiving element placed opposite each other across a disk with a detection part such as a magnetic piece, or a built-in detection part such as a reed switch placed close to the magnetic piece of the disk. 1st of
The sensor body is fixed to a steering column that rotatably supports a steering shaft using a fixing means such as a tapping screw, and the rotation of the steering shaft is fixed to a disc-shaped side wall of a disc casing attached to the steering shaft. A second sensor wooden body containing a built-in potentiometer that is transmitted by a gear that meshes with the gear part is fixed using fixing means such as a mounting bolt so that it straddles the steering column and occupies a position on the opposite side of the first sensor. By being fixed to the first sensor body, the rotary encoder-type first sensor body and the potentiometer-type second sensor body can be compactly attached to the steering column, making it possible to compactly attach the rotary encoder type first sensor body and the potentiometer type second sensor body to the steering column. By reducing the number of parts to be changed around the column, it is possible to reduce costs and improve the workability of installing the steering column.In addition, when a large force is applied between the steering shaft and the steering column, such as in the event of a frontal collision, the synthetic resin first The sensor body has a simple configuration, such as the fact that the attachment part of the sensor body to the steering column by fixing means such as a tapping screw will break, so the operation of the shock energy absorbing device attached to the steering shaft and steering column will not be hindered. Together, they can have great practical effects.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, Fig. 3 is a side view of the device shown in Fig. 1, and Fig. 4 is a sectional view to which the present invention is applied. This is a diagram explaining the principle of an optical rotary encoder. DESCRIPTION OF SYMBOLS 1... Steering shaft, 2... Disc casing, 3... Disk, 4... Steering column, 5... Steering speed sensor body, 6... Tapping screw 7... Steering angle sensor gear case, 8...
・Mounting bolt, 9... Gear, 1o... Rudder angle sensor body, l1... Bolt. that's all

Claims (1)

[Claims] The disc is attached to the steering shaft and is held in a disc casing with disc-shaped side walls at both ends, and has detection parts such as a plurality of slits or magnet pieces arranged at equal intervals around the outer circumference of the disc. The first sensor body is made of synthetic resin and has a built-in detection unit such as a light emitting element and a light receiving element that are placed opposite to each other, or a reed switch that is placed close to the magnetic piece of the disk.The steering shaft can be rotated using the first sensor body made of synthetic resin. It is fixed to the supporting steering column using a fixing means such as a tapping screw, and the rotation of the steering shaft is transmitted by a gear that meshes with a gear part provided on a disc-shaped side wall of a disc casing attached to the steering shaft. A second sensor body containing a built-in potentiometer is fixed to the first sensor body using a fixing means such as a mounting bolt so as to straddle the steering column and occupy a position opposite to the first sensor. Features a steering sensor mounting structure.