JPH0526684U - Wiper - Google Patents

Abstract

(57) [Summary] [Purpose] With a wiper, temporarily increase the pressing force of the blade against the windshield. [Arrangement] An arm head 2 which is the most drive side component of the wiper and which is on the oscillating movement axis, and a pivot which is connected to the arm head 2 and transmits the oscillating movement to the arm head 2. The shaft 1 is connected so that the relative position is variable only in the rotation axis direction, and the extension of the arm spring 7 that applies a pressing force to the blade 3 changes depending on the relative position of both parts, and the pressing force of the blade 3 changes. To do. [Effects] By making it possible to change the pressing force of the blade at any time, when a substance having strong adhesiveness adheres to the windshield, the substance can be removed more easily than conventional products.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wiper, and more particularly to a wiper having a blade with a variable pressing force.

[0002]

[Prior Art]

 The wiper mainly has a function of wiping off an object attached to the outer surface of the windshield, and is an important device for ensuring the visibility of the occupant.

As the adhered matter, various things such as rain and snow, unburned matter of a preceding vehicle and insects can be considered. The condition of the front of the windshield is related to weather conditions and vehicle specifications, and changes from moment to moment.

Some specifications of the wiper are standardized in Japanese Industrial Standards, and the standard length of the blade, which is a portion for contacting the front glass surface to remove foreign matter, and the rotation speed of the wiper motor, which is the drive source for the wiping operation. Are standardized. Regarding wiper wiping performance, there is a standardized range of pressing force per unit blade length.

In the conventional wiper, the pressing force of the blade against the windshield is maintained at a substantially constant value depending on the position during the wiping operation. The blade pressing force changes depending on the location of the windshield because the angle α formed between the pivot shaft that transmits power to the arm and the arm piece that transmits the swinging motion to the blade is Due to the change, the tension of the arm spring that gives the pressing force changes, and the total pressing force also changes. Another cause is that the lever that distributes the transmitted pressing force to the entire blade distributes the pressing force unevenly.

In order to maintain the pressing force at a constant value, a spring having a small spring constant is used as the arm spring that applies the pressing force, and the amount of change in the pressing force is made smaller than the amount of change in the α angle. By devising the device and improving the shape of the lever that holds the blade, the pressing force of the entire blade is evenly distributed.

Further, there is a function that allows the operation speed of the wiper to be selected depending on the amount of the adhered substance, and a product having specifications according to the environment in which the wiper is used, such as a wiper for cold regions.

[0008]

[Problems to be solved by the device]

 However, as mentioned above, the condition of the deposits and the surface of the windshield is diverse, and conventional wipers cannot handle all situations.

It can be said that the wiper that can obtain the same pressing force over the entire wipeable area is optimally designed if the entire front glass is always in the same state. However, even if a part of the windshield suddenly becomes different from the surroundings, it cannot be dealt with at all. Things like this are not special. For example, it is quite possible that unburned materials of 2-cycle two-wheeled vehicles containing lubricating oil or highly adhered loads may fly to the windshield and adhere to it. If this blocks the view in front of the vehicle for a long time, it may lead to an accident. It is very dangerous especially if you get up while driving at high speed.

However, if a wiper with a constant force larger than the conventional pressing force is attached, a large motor must be used, and the life of the blade rubber will be shortened. come.

In view of the above-mentioned problems of the conventional technique, the present invention temporarily increases the pressing force of the blade in the wiper to remove the adhered matter that is difficult to remove in the conventional wiper. It is intended to be easily removed compared to.

[0012]

[Means for Solving the Problems]

 The present invention for achieving the above object is to install an arm on an arm head rotatably mounted on a vehicle in a wiper for removing an object attached to a front surface of a windshield of the vehicle to secure a field of view of an occupant. A blade driver for wiping the front surface of the windshield is provided at the tip of the arm, is connected to a drive source, and is capable of rotating and reciprocating so that the arm head is slidable in an axial direction on a pivot shaft mounted on the vehicle. The wiper is characterized by having drive means for sliding the arm head in the axial direction with respect to the pivot shaft when engaging and changing the pressing force of the blade rubber against the windshield.

[0013]

[Action]

 The arm head, which is the center of rotation of the wiper, and the power transmission shaft of the arm head are connected in a state where the relative position is variable only in the axial direction of the transmission shaft, and the force to pull the arm head toward the inside of the vehicle body is increased. This strengthens the pressing force of the blade against the windshield and easily removes terrible dirt.

[0014]

【Example】

 FIG. 1 is a view showing an embodiment of a wiper of the present invention. The pivot shaft 1 is a transmission shaft that transmits the power of the motor to the wiper, and the drive from the motor (not shown) is transmitted to this shaft via a mechanism that converts rotational movement (not shown) into rotational reciprocating movement. The rotary reciprocating motion transmitted to the pivot shaft 1 is the most driving-side component in the arm 4 that transmits the rotary reciprocating motion and the pressing force of the blade 3 against the front glass to the blade 3. Is transmitted to the arm head 2 which is the rotation axis of the wiper. Further, the arm head 2 has a flange portion F for contacting the cam 5, and the cam 5 is attached so that the arm head 2 can be pushed downward in the drawing. The fitting portion between the pivot shaft 1 and the arm head 2 is connected in a spline shape so that the relative position is variable only in the axial direction. The relative positions of the two parts are balanced by the action of the tension of the arm springs 7 and 8 for moving the arm head 2 upward in the figure and the action of the cam for pushing down the arm head 2. Has been decided by. Further, the volume of the space between the pivot shaft 1 and the arm head 2 in which the spring 8 is interposed changes depending on the relative position of the two parts, so an air hole A is opened in the arm head. The wiper oscillates around the axis connecting the pivot shaft 1 and the arm head 2 as a rotation axis, and wipes the windshield.

The rotary reciprocating motion of the arm head 2 is connected to the arm head 2 via the hinge pin 9, and is transmitted to the retainer 10 which is capable of partial rotary motion around the hinge pin 9 and is transmitted to the arm piece 11. Be done. On the other hand, the pressing force is transmitted to the arm piece 11, which is connected to the arm head 2 via the metal fitting 12 and the arm spring 7. The driving force and the pressing force transmitted to the arm piece 11 are first transmitted to the lever 16 and the yoke 17 via the clip 15, and then transmitted from the lever 16 and the yoke 17 to the blade rubber 19 via the packing 18. As a result, the blade 3 can press the surface of the windshield while swinging it, that is, can perform a wiping operation. Next, a procedure for changing the pressing force of the blade 3 on the windshield will be described. When the motor, which is a drive source (not shown), is energized, the motor starts to rotate. The rotary motion of the motor is transmitted to the pivot shaft 1 through a mechanism (not shown) that converts the rotary motion into rotary reciprocating motion. The rotary reciprocating motion transmitted to the pivot shaft 1 is transmitted to the arm head 2 mounted so that the axial relative position to the pivot shaft 1 is variable, and the wiper swings. The relative positions of the two components are the action of pulling the arm head 2 away from the pivot shaft 1 by the urging force of the arm spring 7 and the vane 8 and the action of the cam 5 for pushing the arm head 2 downward. It is decided in proportion to the reaction.

From this balanced state, when the cam 5 is rotated and a downward load larger than the current state is applied to the arm head 2, the force for pushing the arm head 2 downward by the cam 5 increases, and the cam 5 balances it. Therefore, the tension of the arm springs 7 and 8 becomes large. Due to the increase in the tension of the arm spring 7, the pressing force of the blade against the front glass increases.

Another embodiment will be described. In the embodiment shown in FIG. 2, a downward load is applied by the cam 5, but in this embodiment, as shown in FIG. 3, the solenoids 21, 22 installed in the vehicle body M via the bearing B 1 are used. By energizing, the spring 23 is pulled downward and the arm head 2 is pulled. By pulling the arm head 2, the tension of the arm spring 7 increases and the pressing force of the blade increases.

[0018]

[Effect of the device]

 As described above, according to the present invention, the pressing force of the blade against the windshield can be increased at any time during the operation of the wiper.

[Brief description of drawings]

FIG. 1 is a sectional view of a wiper according to a first embodiment,

FIG. 2 is an enlarged sectional view of the vicinity of a connecting portion between an arm head and a pivot shaft in the first embodiment,

FIG. 3 is an enlarged sectional view of the vicinity of a connecting portion between an arm head and a pivot shaft in the second embodiment.

[Explanation of symbols]

1 ... Pivot axis 2 ... Arm head 3 ...
Blade 4 ... Arm 5 ... Cam 7 ...
Arm spring 8 ... Spring 9 ... Hinge pin 10 ...
Retainer 11 ... Arm piece 12 ... Fitting 15
… Clip 16… Lever 17… Yoke 18
... Packing 19 ... Blade rubber 21,22 ... Solenoid 23
… Spring A… Air hole B… Bearing F…
Flange M ... Vehicle body α ... Angle between arm and pivot axis

Claims (1)

[Scope of utility model registration request] 1. A wiper for removing an object adhering to the front surface of a windshield of a vehicle to secure the field of view of an occupant, wherein the arm is attached to an arm head rotatably mounted on the vehicle, and the front surface of the windshield is wiped. A blade rubber is installed at the tip of the arm, is connected to a drive source, and engages the arm head slidably in the axial direction with a pivot shaft mounted on the vehicle so as to be reciprocally rotatable. A wiper comprising drive means for sliding the arm head in the axial direction with respect to the pivot shaft when changing the pressing force on the windshield.