JPH06206518A - Wiper device for vehicle - Google Patents

Abstract

PURPOSE:To provide a vehicle wiper device whose structure is compact and whose wiping pressure change freedom degree is large and whose wiping pressure change is conducted easily. CONSTITUTION:This device is provided with 2 wiper arm 3 whose base end is coupled to the tip of an arm head 2 so as to be inclinable toward a glass surface; a lever body 4 whose middle position is coupled so as to be inclinable in the same direction as the wiper arm 3; and coil spring 5 that is suspended between the tip of the lever body 4 and the tip portion of the wiper arm 3 and energizes the wiper arm 3 toward the glass surface; a piston member 6 provided slidably at the pipe inside of a drive shaft 1 to conduct the inclination operation of the other end of the lever body 4 at the time of slide: and a cam member 7 which is provided at a body panel P and makes the piston member 6 press pushingly and slide by making a pin member 61 that moves with the rotation of the piston member 6 rotating together with the drive shaft 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle wiper device, and more particularly to a structure improvement of a wiper device having a variable wiping pressure.

[0002]

2. Description of the Related Art Attempts have been made to reduce the wiping pressure at the time of reversing a wiper blade to prevent the generation of a hitting sound. For example, Japanese Patent Laid-Open No. 3-176253 discloses a coil for urging a wiper arm toward the glass surface. Spring tension,
It has been proposed that the lever operated by a link arm can be changed so that the tension is weakened when the blade is reversed.

[0003]

However, in the above-mentioned conventional structure, since the link arm connected to the drive shaft needs to be arranged in the arm head in the wiper arm direction, the arm head is increased in size and length. There is a problem that sizing is inevitable.

Further, in recent years, a large windshield having a large change in curvature has been widely used, and in order to follow the curvature of the glass surface to obtain a good wiping performance, the wiping pressure is continuously varied in a wide range. It is necessary to change it, but it is difficult to handle it with the conventional structure using the link arm.

Further, there is a demand to easily change the wiping pressure on a glass surface having a different shape depending on the type of vehicle, and it is difficult for the conventional link arm to quickly change the wiping pressure.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems, and to provide a vehicle wiper device having a compact structure, a large degree of freedom in changing the wiping pressure, and an easy change in the wiping pressure.

[0007]

To explain the structure of the present invention, the link mechanism 11 is supported by a body panel P of a vehicle.
Drive shaft 1 that can be reciprocally rotated by
An arm head 2 having a base end fixed to the drive shaft 1 for turning; a wiper arm 3 having a base end coupled to the tip of the arm head 2 so as to be tiltable toward the glass surface; and a wiper arm 3 for the arm head 2. A lever body 4 which is connected at an intermediate position so as to be tiltable in the same direction, and a spring member 5 which is suspended between the tip of the lever body 4 and the tip of the wiper arm 3 to urge the wiper arm 3 toward the glass surface. A piston member 6 slidably provided in the cylinder of the drive shaft 1 for tilting the other end of the lever body 4 at the time of sliding, and the piston member 6 rotating with the drive shaft 1 move with rotation. And a cam member 7 provided on the body panel P for abutting the outer peripheral portion 61 thereof and pressingly sliding the piston member 6.

[0008]

In the above structure, when the piston member 6 in the drive shaft 1 is slid by the cam member 7,
The lever body 4 is tilted in accordance with the movement position, the tension of the spring member 5 suspended at the tip of the lever body 4 changes, and the force for urging the wiper arm 3 toward the glass surface, that is, the wiping pressure of the wiper blade is changed. Be changed.

Since the wiping pressure changing mechanism is housed in the drive shaft 1, the entire structure is compact.

If the cam surface of the cam member 7 is shaped according to the curvature of the glass surface, it is possible to easily and continuously change the wiping pressure.

Further, the present invention can be applied to a wide variety of vehicles only by replacing the cam member 7.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a tubular housing 8 is fixed to a body panel P of a vehicle, and a tubular drive shaft 1 having a lower end closed therein is provided with upper and lower bushes 81 ,.
It is rotatably provided via 82. A lower end portion of the housing 8 has a large diameter, and a cam member 7, which will be described in detail later, is covered so as to close the opening and is fixed by a screw 71.

The lower end of the drive shaft 1 is rotatably penetrated through the cam member 7 and exposed downward. One end of a known link arm 11 constituting a wiper swing mechanism is coupled to the lower end to drive the drive shaft. The shaft 1 is reciprocally rotated.

A washer 83 and a circlip 84 are provided in contact with the washer 83 at the upper end opening of the housing 8 through which the drive shaft 1 is inserted. The circlip 84 and the link arm 11 allow the drive shaft 1 to be vertically positioned. Has been done.

A cover 21 is provided on the upper end of the drive shaft 1.
The arm head 2 covered with is fixed at the base end. A plan view and a side view of the arm head 2 are shown in FIGS. The mounting hole 22 at the base end (the left end in the figure) is cut off toward the end face, and the left and right ends that have been cut off are provided with a through hole 23 and a screw hole 24 with their centers aligned. Then, the mounting hole 22 is fitted into the small-diameter upper end of the drive shaft 1, and the screw 25 screwed into the screw hole 24 through the through hole 23.
(Fig. 2) Tighten the left and right ends to fix.

A mounting hole 26 is formed at the tip of the arm head 2 so as to pass through the arm head 2 in the horizontal direction. The base end of the wiper arm 3 (FIG. 2) having an inverted U-shaped cross section is not shown in the drawing. It is connected so that it can be tilted toward the glass surface. That is, the cylindrical bearing member 31 (FIG. 1) and the bush 32 are arranged in the mounting hole 26, and the screw-shaped shaft member 33 is inserted into the bush 32 so that both ends thereof are located on both sides of the base end of the wiper arm 3. Fix (Fig. 2).

A lever body 4 is provided along the inside of the base end of the wiper arm 3 and its plan view and side view are shown in FIGS. The lever body 4 has left and right side plates 41 and 42 which are bent symmetrically.
Are connected by horizontal walls 43, 44 at both ends. The left and right side plates 41, 42 are connected by a brace 45 between the central bent portions, and the mounting holes 46, 47 provided in the both side plates 41, 42 near this connecting portion are rotatably attached to the shaft member 33. is there.

Then, the coil spring 5 is inserted into the engaging hole 48 formed in the horizontal wall 43 at the tip (right end in FIG. 5) of the lever body 4.
One end of (Fig. 1) is locked and the other end is wiper arm 3
Is locked to the tip end (not shown). This coil spring 5
Is for biasing the wiper arm 3 toward the glass surface in the downward direction in FIG. 1. The greater the biasing force, the wiper arm 3
The wiping pressure of the wiper blade (not shown) attached to the roller becomes large.

The biasing force is proportional to the moment of the spring force around the shaft member 33. Therefore, when the tip of the lever body 4 is tilted downward, the coil spring 5 is pulled to increase its spring force, and its line of action is separated from the shaft member 33, so the moment increases.
The wiping pressure increases.

In FIG. 1, a piston member 6 is provided in the cylinder of the drive shaft 1 so as to be vertically slidable. The piston member 6 has upper and lower ends 63 and 64 having a large diameter and is in contact with the cylinder wall. ing. A small diameter convex portion 62 is formed on the upper end surface of the piston member 6, and the convex portion 62 is inserted into a mounting hole 49 (FIG. 5) provided in the proximal horizontal wall 44 of the lever body 4 to insert a C ring 65. Connected by.

A pin member 61 is provided at a lower end portion 64 of the piston member 6 so as to penetrate the piston member 6 in a radial direction, and both exposed ends of the pin member 61 are elongated holes 12, 13 formed in a vertical direction on a side surface of the drive shaft 1. It projects through the cam member 7 (see FIG. 7) and contacts the cam surface 7a on the upper surface thereof. The cam surface 7a is divided into four in the circumferential direction, and two places at symmetrical positions in the radial direction are convex portions 72 and 73 projecting upward, and two concave portions 74 and 75 remaining on the convex portions 72 and 73 ( Fig. 8) is continuous on the slope.

When the pin member 61 rides on the convex portions 72 and 73 of the cam member 7 as the drive shaft 1 rotates,
The piston member 6 is pushed and moved upward. The base end of the lever body 4 is pushed up, the lever body 4 rotates about the shaft member 33, and the tip end thereof tilts downward. With this downward tilt,
As described above, the wiping pressure of the wiper blade increases.

Therefore, the convex portions 72, 7 of the cam member 7 are
If the forming position of 3 is set to the reciprocating swivel stroke of the wiper arm 3 and the recesses 74 and 75 are set to correspond to the wiper blade reversing stroke of the arm swivel end, respectively, a sufficiently large wiping pressure can be obtained when wiping the glass surface. When the blade is reversed, the wiping pressure is reduced and a smooth reversing operation without impact noise is guaranteed.

When the wiper is not used, the wiper arm 3
Is located at the turning end, but in this state, the wiping pressure, that is, the pressing pressure of the blade on the glass surface is small, so that the deterioration of the blade rubber is prevented and the durability is improved.

As described above, since the piston member and the cam member for operating the piston member are housed in the cylindrical space of the drive shaft, the wiping pressure of the wiper can be changed with a compact structure.

According to the present invention, the wiping pressure can be freely changed by appropriately changing the cam member 7. For example, as shown in FIGS. 9 and 10, the cam surface 7 a of the cam member 7
By making the curved surface which continuously moves up and down, it is possible to obtain an appropriate wiping pressure according to the curvature of the glass surface over the entire wiping process of the wiper.

Thus, by appropriately replacing the cam members having different cam surface shapes, it is possible to quickly cope with different vehicle types.

[0028]

As described above, according to the vehicle wiper device of the present invention, the wiping pressure of the wiper can be easily changed and set in a wide range and with a high degree of freedom due to the compact structure.

[Brief description of drawings]

FIG. 1 is an overall vertical sectional view of a wiper device.

FIG. 2 is a partial plan view of the wiper device, which is a view taken in the direction of arrow A in FIG.

FIG. 3 is a plan view of a wiper head.

FIG. 4 is a side view of the wiper head.

FIG. 5 is a plan view of a lever body.

FIG. 6 is a side view of a lever body.

FIG. 7 is a plan view of the cam member, the cross-sectional portion of which is VII-VI in FIG.
It is along the I line.

8 is a cross-sectional view of the cam member, the cross-section being taken along the line VIII-VIII in FIG.
It is along the line.

FIG. 9 is a cross-sectional view showing another example of a cam member.

FIG. 10 is a sectional view showing still another example of the cam member.

[Explanation of symbols]

 1 Drive Shaft 2 Arm Head 3 Wiper Arm 4 Lever Body 5 Coil Spring (Spring Member) 6 Piston Member 61 Pin Member (Outer Part) 7 Cam Member P Body Panel

Claims (1)

[Claims] 1. A cylindrical drive shaft supported by a body panel of a vehicle and reciprocatingly rotated by a link mechanism, an arm head having a base end fixed to the drive shaft and turning, and a glass surface at a tip of the arm head. A wiper arm having a proximal end coupled to the wiper arm, a lever body having an intermediate position coupled to the arm head so as to be capable of tilting in the same direction as the wiper arm, and suspended between the tip of the lever body and the tip of the wiper arm. Spring member that biases the wiper arm toward the glass surface, a piston member that is slidably provided in the cylinder of the drive shaft and that tilts the other end of the lever body when sliding, and rotates together with the drive shaft. The body panel, in which the outer peripheral portion of the piston member that moves with rotation is brought into contact with the piston member to press and slide. Vehicle wiper device including a cam member provided on the vehicle.