JPH0281777A - Motorcycle headlight light distribution adjustment device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device that vertically adjusts the optical axis of a headlamp during starting or braking to maintain road surface light distribution within a substantially constant range.

(Prior Art) The road surface light distribution of a motorcycle is set based on straight forward driving in the IG state, and the road surface light distribution changes depending on the posture of the vehicle body while driving. Japanese Patent Laid-Open No. 63-53137 is known as a technique for correcting this. This prior art calculates the puncture angle during cornering from the vehicle speed and steering angle, and adjusts the optical axis of the headlight accordingly.

(Problem B to be solved by the invention) The above-mentioned conventional technology cannot adjust the road surface light distribution when starting or braking, or even when the vehicle body is tilted forward or forward due to unevenness of the road surface. do not have.

(Means for Solving the Problems) In order to solve the above problems, the present invention detects the posture of the vehicle body in the longitudinal direction, such as the front up state or the front down state, using a sensor or the like, and adjusts the headlights accordingly. The optical axis can be changed vertically.

(Function) When the vehicle is tilted forward, the optical axis is directed upward by operating the headlight itself or the shade; when the vehicle is tilted forward, the optical axis is directed downward by the same operation. so that the road surface light distribution is approximately constant.

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

Fig. 1 is an overall view of a motorcycle to which a headlamp light distribution adjustment device according to the present invention is applied, Fig. 2 is a cross-sectional view of the headlamp portion, and Fig. 3
The figure is a hydraulic circuit diagram of the rear suspension, and FIG. 4 is a control flowchart.

In a motorcycle, a front suspension 2 extends downward from a hella vibe 1 part of a body frame, a front wheel 3 is supported at the lower end of this front suspension 2, a body frame 3 is supported, and a rear hella fork 4 is extended from the body frame. A rear wheel 5 is supported at the rear end of the rear fork 4, and a rear suspension 6 and a stroke sensor 7 for the rear suspension 6 are provided between the rear fork 4 and the rear frame.

Further, the front end of the vehicle body is covered with a cowling 8, which houses a headlamp 9 and a stroke sensor 10 for the front suspension 2.

On the other hand, a bracket 11 is fixed to the head vibrator 1 as shown in FIG. 2, and arms 12 and 13 extend forward from the upper and lower ends of the bracket 11. A motor 15 driven by a signal from the braking device 14 and a rack par 16 that moves forward and backward by the drive of the motor 15 are provided, and joint receivers 17 and 18 are attached to the tip of the arm 12 and the tip of the rack par 16. 18 are engaged with ball joints 19 and 20 attached to the upper and lower surfaces of the headlamp 9. Thus, the motor 15 is controlled by the signal from the control device 14.
When driven, the headlight 9 swings vertically around the upper ball joint 19, and the optical axis changes.

By the way, the front suspension 2 and the rear suspension 6 have a structure that allows the vehicle height to be adjusted. That is,
Regarding the structure of the rear suspension 6, as shown in FIG. The suspension piston 23 defines an oil chamber S within the cylinder 22 and supports the upper end of the suspension spring 24.

Also, the oil in the surge tank 25 is accumulated in the accumulator 28 by the pump 27 driven by the motor 26, and the oil is
By opening the N valve 29, the oil in the accumulator 28 is supplied into the oil chamber S to raise the vehicle height, and by discharging the oil in the oil chamber S into the tank 25 through the relief valve 30, the vehicle is raised. Lower the height. Further, the front suspension 2 also has substantially the same structure. Here, the valves 29,30 are operated by signals from the control device 14.

That is, as shown in FIG. 4, it is determined whether the strokes of the front suspension 2 and rear suspension 6 detected by the stroke sensor 7.10 are within a predetermined range, and if they exceed the predetermined range, the ONN pulp Alternatively, adjust the vehicle height by operating the relief valve, and then judge whether the stroke ratio of each suspension 2 and 6 is within a predetermined range.If it exceeds the predetermined range, that is, front up or front down When the degree of the change becomes large, the motor 15 is driven to adjust the optical axis up and down.

In other words, as shown in the screen light distribution (light distribution to a screen installed in front of a stationary vehicle body) in Figure 5, when the vehicle body falls forward due to braking etc. from the IG state, the optical axis is directed upward. , light distribution a. so that it becomes al. Then, as shown in FIG. 6, the road surface light distribution also spreads from ao to a. Further, when the vehicle body is tilted forward, the optical axis is directed downward so that the light distribution changes from ao to a2.

In this way, in the present invention, the stroke sensor 7.10
Since vehicle height adjustment and optical axis adjustment are performed simultaneously based on the detected value, it is possible to maintain road surface light distribution in accordance with the vehicle body posture in real time. In addition, to further improve responsiveness, instead of detecting the stroke amount, it is also possible to use so-called active control, which inputs the throttle opening and brake switch, predicts the attitude of the vehicle body, and adjusts the optical axis. It is.

FIG. 7 is a diagram similar to FIG. 2 showing another embodiment, and the same members as in the previous embodiment are given the same numbers.

That is, in the embodiment shown in FIG. 7, brackets 40 and 41 are fixed to the upper and lower surfaces of the headlamp 9.

The upper bracket 40 has a single character shape as shown in FIG. 8, and a bracket 42 attached to the tip of the arm 12.
and in this state, the arm 12 and the headlight 9
It is pressed downward by a wire spring 43 inserted between. A nut 44 is fixed to the bracket 41, a ball screw 45 is screwed onto the nut 44, a worm wheel 46 is fitted onto the ball screw 45, and a motor is driven to drive the worm wheel 46 with a signal from the control device 14. It is meshed with a worm gear 47 fitted on the shaft of No. 15. When the ball screw 45 is rotated by the motor 15, the headlight 9 swings in the vertical direction about the upper engaging portion, and the optical axis is adjusted. In addition, in Figure 7,
48 is a return spring, and 49 is a potentiometer for detecting the amount of movement of the ball screw 45, that is, the angle of the headlight 9.

Further, in the embodiment shown in FIG. 9, an opening is formed in the lower part of the headlamp 9, a holder 50 is installed in this opening, and a shade 51 is housed in the holder 50 so as to be able to move up and down. The shade 51 is moved up and down relative to the valve 53 by a motor 52 driven by a signal from the control device 14. With such a configuration, the optical axis can be adjusted by moving only the shade 51 up and down without swinging the entire headlamp 9, and the motor 52 can be used with a small capacity.

(Effects of the Invention) As explained above, according to the present invention, even if the vehicle body is in a front-up or front-down position due to sudden start, braking, or unevenness of the road surface, the optical axis is adjusted according to this position. is adjusted instantly, ensuring appropriate road surface light distribution at all times.

[Brief explanation of the drawing]

Fig. 1 is an overall view of a motorcycle to which a headlamp light distribution adjustment device according to the present invention is applied, Fig. 2 is a sectional view of the headlamp portion, and Fig. 3
Figure 4 is a hydraulic circuit diagram of the rear suspension, Figure 4 is a control flowchart, Figure 5 is a diagram showing screen light distribution, Figure 6 is a diagram showing road surface light distribution, and Figure 7 is a diagram showing another embodiment. FIG. 8 is an exploded perspective view of the main parts of the headlamp shown in FIG. 7, and FIG. 9 is a view similar to FIG. 2 showing another embodiment. In the drawing, 2 is a front suspension, 6 is a rear suspension, 7.10 is a stroke sensor, 9 is a headlight, 14 is a control device, 15.52 is a motor, 16 is a rack par, 45 is a ball screw, and 51 is a shade. . Patent applicant: Agent for Honda Motor Co., Ltd.
Patent Attorney Part 2 1) Part 1 Patent Attorney
Kuni Ohashi, Patent Attorney, Department
Yu Yama Figure 4 U. School 5 Figure 6

Claims (4)

[Claims] (1) A headlight arrangement for a motorcycle that includes an attitude detection means that detects the attitude of the vehicle body in the longitudinal direction, and an optical axis adjustment mechanism that changes the optical axis in the vertical direction based on the value detected by the attitude detection means. Light adjustment device. (2) The headlamp light distribution adjustment device for a motorcycle according to claim 1, wherein the attitude detection means includes a front suspension stroke sensor and a rear suspension stroke sensor. (3) The headlight arrangement for a motorcycle according to claim (1), wherein the motorcycle includes a vehicle height adjustment mechanism, and the vehicle height adjustment mechanism and the optical axis adjustment mechanism operate simultaneously. Light adjustment device. (4) The headlamp light distribution adjustment device for a motorcycle according to claim (1), wherein the optical axis adjustment mechanism moves a shade up and down.