JPS59167349A - Wiper device - Google Patents

Abstract

PURPOSE:To facilitate pressing force changing operation by displacing a wiper blade pressing spring through a drive mechanism in the direction approximately perpendicular against the shrink/extend direction and varying the pressing force of wiper blade. CONSTITUTION:In order to increase pressing force of wiper blade, a motor is driven to rotate a warm wheel 42 through a warm pinion 41. Consequently a drive shaft 36 screwed with the wheel 42 will lower to lower a lever drive pin 36a and a spring hook pin 34 thus to displace the spring hook section 33a and hook lever 35 of spring 33 to the position shown by dashed line. Since the operating line of spring 33 will separate from a head joint pin 32, pressing force of wiper blade is increased through a wiper arm retainer 31. In order to decrease pressing force of wiper blade, the motor is driven reversely to rotate the warm wheel 42 reversely.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wiper device in which the pressing force of a wiper blade can be easily changed.

A wiper device for a vehicle reciprocates a wiper arm and performs a wiping operation while pressing a wiper blade attached to the tip of the wiper arm against a windshield.

By the way, the blades of the wiper device may be lifted off the windshield due to wind pressure when the wind is strong or when the vehicle is running at high speed, and as a result, the windshield may not be completely wiped and the forward view may be obstructed. Therefore, recently, a device has been proposed in which the pressing force of the wiper blade against the windshield can be adjusted.

FIG. 1 is a cross-sectional view of the main parts of a conventional wiper device that allows adjustment of the pressing force of the wiper blade, and 1 is a swiveling device that is swung by a wiper motor (not shown) via a wiper link (not shown). Link arm, 2 is link arm 1
3 is a pivot bearing that holds the wiper shaft 2 and is attached to the vehicle body; 4 is an arm head attached to the wiper shaft 2; 5i; i; the end of the arm head 4; with head joint bin 6
The wiper arm retainer is rotatably supported by the wiper arm retainer. 7 is a wiper blade suppression spring that applies a predetermined pressing force to the wiper blade (not shown); 8 is a hook whose one end is engaged with the suppression spring 7 and the other end is hooked onto and supported by the pin 4a of the arm head 4; Lever, 9 is a screw cylinder that contacts one end of lever 8, 10 is an adjustment knob for moving the screw cylinder 9 up and down to adjust the pressing force, 1
1 is a lock nut to prevent the screw cylinder 9 from loosening.

In the above wiper device, in order to increase the pressing force of the wiper blade, turn the adjustment knob 10 in a predetermined direction, the screw cylinder 9 will be lowered, and the hook lever 8 will be held at its lower end.
Since one end of the lever 8 is pushed downward, the lever 8 and the suppression spring 7 are displaced to the position shown by the chain line. As a result, the line of action of the suppression spring 7 is separated from the head joint pin 6, so that the pressing force of the wiper blade can be increased. On the other hand, when the adjustment knob 10 is turned in the opposite direction, the screw cylinder 9 is raised and the lever 8 is returned upward by the spring force of the pressure spring 7, and the line of action of the suppression spring 7 approaches the head joint pin 6, so that the wiper blade is not pushed. Pressure can be reduced.

By the way, in the wiper device described above, the adjustment knob for adjusting the pressing force of the wiper blade is located outside the vehicle in order to ensure proper wiping by the wiper blade V, so it may be pressed while flying, for example, when entering an expressway from a general road. Unable to increase pressure. Therefore, in such cases, it is necessary to stop the car, go outside and adjust the adjustment knob to increase the pressure on the blade, and when exiting the expressway, stop the car, go outside and adjust the adjustment knob. The pressure on the blade must be restored to its original state.

However, such an operation for changing the pressing force is troublesome for the passenger, and a relatively large force is required to turn the adjustment knob.

The present invention has been made in view of the above points, and in order to easily change the pressing force of the wiper blade in a wiper device, the wiper blade suppression spring is moved in a direction substantially perpendicular to the direction of expansion and contraction of the wiper blade. The VC is designed to be displaced by a drive mechanism to change the suppressing force of the wiper blade.

The present invention will be explained below based on the drawings.

2 to 4 are sectional views showing essential parts of an embodiment of a wiper device according to the present invention, and FIG. 2 shows a bin 2 for explanation.
8a1 spring hook pin 34, wiper blade suppression spring 33
, the hook lever 35 is also shown. In FIG. 2, a link arm is swung by a 20U wiper motor (not shown) via a wiper link (not shown), 21 is a ball of a ball joint that is a joint of the wiper link, and 22 is a ball of a ball joint that is a joint of the wiper link. A wiper shaft rotates in conjunction with the link arm 20, 23 is a pivot bearing that holds the wiper shaft 22 and is attached to the vehicle body, 24tjl
This is a contact plate attached around the connection part of the Junk arm 20 with the wiper shaft 22, and this contact plate 24
A harness 25, which will be described later, is connected to the contact 24a, and a contact piece 27 connected to a lead wire 26 on the power supply side comes into contact with the contact 24a. 28 is an arm head attached to the wiper shaft 22; 25 is a harness that is connected to the drive motor 29 and the rheo stud 30 shown in FIGS. 3 and 4 and passes through the center of the wiper shaft 22; 31 is a harness A wiper arm retainer 33 is movably supported by a head joint pin 32 at the end of the arm head 28, and a wiper blade suppression spring 33 applies a predetermined pressing force to a wiper blade (not shown). Spring footer f! The fIS 33a is supported by a spring tension pin 34. 35
is a hook lever whose one end is hooked and supported by the pin 28a of the arm head 28, and the other end is hooked and supported by the spring hook pin 34, and this hook lever 35
The drive shaft 36 is located close to the spring hooked pin 34.
As shown in FIG. is engaged with. As shown in FIG. 3, the support shaft 39 of the worm wheel 38 is provided with a VC screw to hold the worm pinion 4 ] so as to sandwich the bearing 40 , and the worm pinion 41 has a screw 36 b ( A worm wheel 42 is engaged with the hinged worm wheel 42 (see FIG. 2). These worm pinions 37,4] and worm wheels 39,42
The rotational speed of the drive motor 29 is reduced by this. Third
The drive motor 29 shown in the figures and FIG. , drive shaft 3
The sliding lever 30a engaged with the lever drive pin 36a of No. 6
The internal resistance value changes according to the movement of the

43, C and 44 are a cover and a case that contain the main parts for changing the suppressing force of the wiper blade.

Next, a method of adjusting the pressing force of the wiper blade in the wiper device will be described.

First, when increasing the pressing force of the wiper blade, operate the pressing force change switch to apply current to the drive motor 29vC through the harness 25, allowing it to rotate for a predetermined period of time.
The rotation of one motor 29 is decelerated and transmitted to the worm wheel 42 via a worm pinion 37, a worm wheel 38, a support shaft 39, and a worm pinion 41. As a result, when the worm wheel 42 rotates, the drive shaft 3
6 is lowered, and the lever drive pin 36a and spring hook pin 34 are lowered, so that the spring hook g33a of the suppression spring 33 and the hook lever 35 are displaced at the position indicated by the chain line.

Therefore, since the line of action of the suppression spring 33 is separated from the head connecting pin 32, the pressing force of the wiper blade against the windshield via the wiper arm retainer 31 increases.

Conversely, when reducing the pressing force of the wiper blade, the pressing force changing switch is operated 17 to rotate the drive motor 29 for a predetermined period of time in the opposite direction to that in the case described above. As a result, the worm wheel 42 now rotates in the opposite direction to the above-described case, and the moving shaft 36 rises, causing the lever drive pin 36a and the spring hook pin 34 to rise, so that the spring hook portion 33a of the suppression spring 33 and the hook lever 35
returns upwards. Therefore, since the line of action of the suppression spring 33 approaches the head contact a pin 32, the pressing force of the wiper blade against the windshield via the wiper arm retainer 31 becomes smaller.

By the way, as the drive shaft 36 moves up and down, the sliding lever 30a of the rheostud 30 moves up and down, and the resistance value inside the rheostud 30 changes, but this resistance change is converted into a change in the magnitude of the suppressing force. For example, if the pressing force is displayed in stages on a display device installed on the instrument panel, the passenger can see the displayed content and therefore immediately know the pressing force at that time. can.

Therefore, the display serves as a guide when changing the wiper blade pressing force, so the switch for changing the pressing force can be operated as necessary, and the desired wiper blade pressing force can be easily obtained. . In addition, the pressing force can be changed easily by simply operating a switch.

Furthermore, a control circuit including a vehicle speed sensor is connected to the lead wire V connected to the drive motor 29, and the drive motor 29 and deceleration mechanism are operated according to the vehicle speed, and the line of action of the compression spring is not changed by changing the tension of the compression spring. By rubbing V to move the blade, the pressing force of the blade can be changed automatically depending on the vehicle speed.

As explained above, the present invention changes the pressing force of the wiper blade by displacing the wiper blade suppression spring in a direction substantially perpendicular to its expansion/contraction direction by the drive mechanism. The pressure can now be changed and the desired suppression tJ can be obtained when necessary. In addition, changing the pressing force does not require the application of large force as in the conventional case, and requires only a switch operation, making shell operation easier.

Furthermore, by connecting a control circuit including a vehicle speed sensor to the drive motor, the pressing force of the blade can be automatically changed according to the vehicle speed.

[Brief explanation of drawings]

Figure 1 shows the key points of the original wiper device! llS cross section, diagram,
2 to 4 are main part sectional views showing one embodiment of the wiper device according to the present invention, and FIG. 2 is a cross-sectional view of A in FIG.
-A sectional view, and FIG. 4 is a BB sectional view in FIG. 3. 1.20... Link arm, 2.22... Wiper shaft, 3, 23... Pivot bearing, 4.28...
・Arm head, 5I31...wiper arm retainer
1-17, 33... Wiper blade pressing spring, 8.3
5...Hook lever, 9...Screw cylinder, ]0
...Adjustment twister, 25...Harness, 29...Drive motor, 30...Reo stud, 6.32...Head joining pin, 36...Driver shaft 7), 37.41・
... Worm Binion, 38.42 ... Worm wheel patent applicant Hiroo Tsuchi Suzuki, Patent Attorney, Nissan Motor Co., Ltd. 11-

Claims (1)

[Claims] A wiper comprising a spring displacement means for displacing a wiper blade suppression spring that presses a wiper blade against a glass surface in a direction substantially perpendicular to the direction of expansion and contraction thereof, and a drive mechanism for operating the spring displacement means. Device.