JPS6345990B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a wiper for a vehicle.

When a vehicle, for example an automobile, runs at high speed, the wind pressure tends to lift the wiper and separate it from the glass surface, but in order to prevent this, it is necessary to increase the pressing force of the wiper against the glass surface. However, if the pressing force is increased, the frictional force between the glass surface and the blade rubber during medium or low speed running becomes excessive, increasing the load on the wiper motor, and furthermore, there is a risk that the glass surface and the blade rubber may be damaged.

The present invention aims to solve the above-mentioned problems, and according to the present invention, a first spring that acts in the direction of pressing the blade rubber against the glass surface to be wiped, and the first spring are identical to each other. a second spring acting in one direction or the opposite direction; when the vehicle is running at high speed, the second spring is actuated by a wind pressure sensing device for sensing the wind pressure applied to the vehicle or an actuating device responsive to a signal from a speedometer of the vehicle. A wiper for a vehicle is provided in which the pressing force of the blade rubber against the glass surface is increased by strengthening or weakening the spring force of the spring.

Preferably, the second spring is a leaf spring, one end of which is hingedly connected to the pivot shaft of the wiper, and the other end of which is hingedly connected to the pivot shaft and is movable in a direction toward or away from the glass surface. and the actuator is connected to a second spring proximate one end hinged to the wiper pivot.

According to the present invention, it is easy and reliable to set the pressing force of the blade rubber against the glass surface at low speeds, and the spring force can be increased in response to wind pressure or vehicle speed when driving at high speeds, so that the wiper does not float. can be completely prevented.

Referring to the accompanying drawings illustrating embodiments of the present invention, reference numeral 1 denotes a pivot shaft connected to a wiper motor (not shown) to make a pivoting motion, 2 an arm body fixed to the pivot shaft 1 and making a pivoting motion together, 3; 4 is pin 5
The arm lever is hinged to the arm body 1 and movable in the vertical direction in FIG. (also not shown) is supported. Reference numeral 6 denotes a coil spring that pulls the arm levers 3 and 4 clockwise in FIG. 1, that is, in a direction toward the glass surface, and constitutes a first spring according to the present invention. Reference numeral 7 denotes a leaf spring, which in the illustrated embodiment applies a force in the opposite direction to that of the spring 6, and constitutes a second spring according to the present invention. One end 7a of the leaf spring 7 is hinged to an integral protrusion 2a of the arm body 2 via a pin 8, and the other end 7b
is fixed to the arm lever 4.

The spring 7 applies a smaller force to the arm lever than the spring 6 during normal operation, that is, when the vehicle is running at low or normal medium speeds, and for this reason, the portion 7c near the hinge pin 8 is slidably attached to the pivot shaft 1. connected to the sleeve 9;
is connected to the piston 11 of the hydraulic cylinder 10 via a cable 12. Under normal conditions, the piston 11 is pulled to the right by the force of the spring 13, the sleeve 9 is pulled in the direction of arrow A, and a moment in the direction of arrow B acts on the end 7a of the spring 7. A predetermined upward force is applied to the end 7.
b is transmitted to the arm lever. At this time, a force (P-F) is applied to the blade rubber toward the glass surface. Here, P is the force due to spring 6,
F is the force exerted by the leaf spring 7.

The cylinder 10 is connected via a pipe 14 to a hydraulic or pneumatic pressure generating device 15, the pressure generated by the device 15 being controlled by a speed sensor 16 which senses the speed of the vehicle. 17 indicates a speedometer. In the embodiment, a sleeve 9, a cylinder 10, a cable 12, a hydraulic or pneumatic pressure generating device 15, and a pipe 1 are shown.
4 etc. constitute the actuating device according to the present invention.

The traveling speed of the vehicle increases to a predetermined value Vo (Figure 2)
When the speed sensor 1 connected to the speedometer 17 exceeds
Hydraulic or pneumatic generator 1 controlled by 6
5 sends hydraulic or pneumatic pressure to the cylinder 10, the piston 11 moves to the left against the spring 13, and the sleeve 9 moves upward. The end 7a of the leaf spring 7 moves clockwise around the pin 8, and the absolute value of the force F exerted by the leaf spring 7 on the blade rubber decreases, thus transmitting it from the arm levers 3, 4 to the blade rubber. The applied force (arm pressure) P−F increases.

In the illustrated embodiment, the leaf spring 7 applies an upward force to the arm lever, but it may also apply a downward force. Speed sensor 1
6 is shown as being connected to the speedometer 17, but it may be provided in parallel with the speedometer of the vehicle or as a separate system. Instead of using a speed sensor, the arm pressure can be changed by sensing the wind pressure that the vehicle receives while driving.

Since the second spring 7 is a leaf spring, it can be easily placed in a narrow space between the wiper and the glass surface.

According to the present invention, performance during high-speed driving can be significantly improved, and problems such as wiper lifting can be prevented. Note that it is easy to adjust the arm pressure under normal conditions. The arm pressure is low at low vehicle speeds, and since the arm pressure changes depending on the vehicle speed, taking into account the buoyancy that changes depending on the vehicle speed, the appropriate pressure is always applied to the blade rubber, improving wiping performance and reducing chatter vibration phenomena. can be reduced.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram schematically showing an embodiment of the present invention. FIG. 2 is a graph showing the relationship between speed and arm pressure. 1: Swivel axis, 2: Arm body, 3, 4: Arm lever, 6: First spring, 7: Second spring, 7a: One end, 7b: Other end, 10: Cylinder, 12: Cable, 15: Hydraulic or pneumatic pressure generator, 16: Speed sensor.

Claims (1)

[Scope of Claims] 1. In a vehicle wiper, a first spring acts in a direction to press the blade rubber against the glass surface to be wiped, and a second spring acts in the same direction or in the opposite direction to the first spring. a spring, and when the vehicle is running at high speed, the spring force of the second spring is strengthened or weakened by a wind pressure sensing device that senses the wind pressure applied to the vehicle or an actuating device that responds to a signal from a speedometer of the vehicle. A wiper for a vehicle, characterized in that the pressing force of the blade rubber against the glass surface is increased. 2. Claim 1, wherein the second spring is a leaf spring and acts in a direction opposite to that of the first spring, and the acting force of the second spring is reduced when the vehicle is running at high speed. Vehicle wiper as described in section. 3. The second spring is a leaf spring, one end of which is hinged to the pivot shaft of the wiper, and the other end connected to an arm lever that is hinged to the pivot shaft and movable toward or away from the glass surface. 2. The vehicle wiper according to claim 1, wherein the actuating device is connected to the second spring at a position close to the one end.