JP2503035B2 - Vehicle wiper device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vehicle wiper device, and more particularly to a wiper device having a variable wiper blade pressing pressure.

[Prior Art] When a vehicle travels at high speed, lift acts on the wiper blade, and the wiper wiping performance deteriorates. Therefore, various wiper devices have been proposed in which the arm supporting the wiper blade is pivotally supported so that it can be directly tilted or the tension of the tension spring is changed to change the wiper blade pressing pressure. There is (Japanese Examined Sho 47-20849)
JP-A-58-87654, JP-A-58-93652, JP-A-58-93653, and JP-A-62-6853).

[Problems to be Solved by the Present Invention] By the way, the above-mentioned conventionally proposed wiper devices include:
There is a problem that its structure is relatively complicated.

Therefore, an object of the present invention is to provide a vehicle wiper device capable of changing the wiper blade pressing force with a simple structure in order to solve such a problem.

[Means for Solving the Problems] A vehicle wiper device of the present invention is provided on a pivot shaft (26, 126) that is reciprocally rotated by a rotation drive means (50).
A fixed member (21, 121) that rotates integrally with the fixed member (21, 121), one end of which is pivotally supported by the fixed member (21, 121) and is rotatable in a direction orthogonal to the rotation surface of the fixed member, and the other end of which is a wiper blade. And the wiper arm (20, 120) holding it and pivotally supported by the fixing member, and the tension of the spring member (25, 125) stretched between the wiper arm and the wiper arm is changed according to the rotating position. The pressure lever (24, 124, 141) and the cam surface (37) which is provided so as to be rotatable relative to the pivot shaft and whose height changes in the pivot axis direction as it goes in the circumferential direction.
a, 37b, 37c, 138a, 138b, 138c) having a cam member (3
7, 138, 131, 137, 139) and a locking member (35, 3) connected to the pressure lever and one end of which is in contact with the cam surface.
6, 141) and the cam member has a plurality of groove portions (37d _-1 , 37d _-2 , 37d _-3 , 37d _-4 , 137c _-1 , 137) on its outer periphery.
c _-2 ) is provided and the claw (3
8, 142) and a drive section (39, 143) for driving the claw, and during normal wiper wiping operation, the cam member and the pivot shaft are integrally rotated by the drive means, while When the tension of the spring member is changed, the pawl is engaged with the groove portion of the cam member to stop the cam member, and the pivot shaft is rotated by the drive means, so that the cam member of the locking member is rotated. The technical means of changing the contacting position to change the rotational biasing force of the wiper arm is adopted.

[Operation and Effect] According to the wiper device having the above-described configuration, during the normal wiper wiping operation, the cam member and the pivot shaft provided around the pivot shaft are integrally rotated by the drive means that reciprocally drives the wiper. When changing the tension of the spring member that applies the rotational biasing force to the wiper, by engaging the plurality of groove portions provided on the outer periphery of the cam member with the pawls to suppress the rotational movement of the cam member, The locking member that abuts on the cam surface changes in accordance with the change in the height direction of the cam surface, and the position of the pressure lever changes, so that the pressing force of the wiper changes.

With such a configuration, the mechanism for changing the urging force can be significantly downsized, and the urging forces in a plurality of stages can be easily set.

Further, since the biasing force of the wiper arm is changed by engaging the cam member with the claw in the groove portion, the force required to change the biasing force is significantly reduced as compared with the conventional one. .

[First Embodiment] FIG. 5 shows a state in which the present device is mounted on the driver's seat side.

A wiper blade 10, a wiper arm 20, a wiper blade 30, a wiper arm 40, a drive motor 50, a lever crank link 60, and an arm pressure varying mechanism 70 are provided on the lower side of the front window W of the vehicle 1. The broken line indicates the wiping surface of the wiper blade 30.

The apparatus will be described in detail with reference to FIGS. The wiper arm 20 includes a fixing member 21, a shaft 21a, bushes 21b and 21c.
And a wiper rod 23 fixed to the link 22 by caulking and a rivet 22a.

The wiper blade 10 is attached to the tip of the wiper rod 23 with screws or the like.

The pressure lever 24 has a shaft 21a, bushes 21b and 21c,
It is pivoted coaxially with the ring 22. The appearance of the lever 24 is shown in FIG.

The contact pressure spring 25 has a hole 23 of the wiper rod 23 at one end.
At a, the other end is suspended in the hole 24a of the lever 24 and acts as a spring member for producing the necessary contact pressure between the wiper blade 10 and the window W surface.

On the other hand, the fixing member 21 of the wiper arm 20 is fixed by a screw 27 to the tip of the pivot shaft 26 that swings through the lever crank link 60 by the rotation of the drive motor 50.

The pivot shaft 26 is rotatably supported on the housing 30 by a washer 31 and a clip 32 on a housing 30 fixed to a vehicle front plate 28 with screws 29. Further, a bush is provided between the housing 30 and the pivot shaft 26, and a space 34 created by the bush serves as a lubricating oil reservoir.

The pivot shaft 26 has a hollow structure (Fig. 1) and slidably supports the piston 35 in the hollow hole.

The upper end 35a of the piston 35 is in contact with one end 24b of the lever 24. Further, a screw 24c is provided on the one end 24b, and
By rotating 24c, the distance between one end 24b of the lever 24 and the upper end 35a of the piston 35 can be adjusted. That is, the set arm pressure can be adjusted.

The lower end portion 35b of the piston 35 is integrally provided with a pin 36 that is slidable in an elongated hole 26a formed in the pivot shaft 26. As a result, the piston 35 can move in the pivot shaft 26 only in the axial direction.

A cam plate 37, which also serves as a gear plate, is attached to the lower part of the pivot shaft 26 so as to be rotatable around the pivot shaft (Fig. 2). FIG. 7 shows a perspective view of the cam plate 37. An end surface cam 37a is formed on the boss portion of the cam plate 37. Normally the piston 35 is a contact pressure spring
The force of 25 is received via the lever 24 and is always urged to the right in FIG. Therefore, the pin 36 is in contact with the end surface cam 37a of the boss portion of the cam plate 37. Therefore, by rotating the cam plate 37 around the pivot shaft 26,
The end surface cam 37a of the boss moves the piston 35.

Further, the end surface cam 37a is a moving surface 37b for moving the piston 35.
And a groove 37c that fits into the pin 36 at the stop position. Since the pin 36 and the groove portion 37c are fitted to each other, the cam plate 37 does not rotate around the pivot shaft 26 unless a torque larger than a preset torque is applied.

Notches 37 _d-1 , 3 on the outer periphery of the flange of the cam plate 37
_7d-2 , _37d-3 and _37d-4 are provided (Fig. 2). Notch
37 _d-1 and 37 _d-4 can engage with a claw 38 provided near the cam plate 37.

The claw 38 is attached to an output shaft 39a of a small motor 39 fixed to the housing 30 via an elastic body 38a. The claw 38 and the notches 37 _{d-1 to} 37 _d-4 are adapted to engage with each other at any fixed position. For example, in the figure, when the pawl 38 is continuously rotated clockwise and the swing lever 61 is rotated counterclockwise, the pawl 38 is rotated.
The right tip 38b of 38 meshes with the notch 37d _-1 . Then, the cam plate 37 stands still, only the swing lever 61 continues to rotate, and eventually the pin 36 slides and moves up on the moving surface 37b of the end surface cam 37a. When the swing lever 61 reaches the reverse position, the pin 36 is set in the groove portion 37c of the end surface cam 37a.

When the swing lever 61 starts to rotate in the clockwise direction, the right end 38b of the claw 38 is pushed out from the notch 37 _d-1 by the outer peripheral end of the cam plate 37, and the right end 38b of the claw 38 and the notch 37 _d-1 disengage. .

The same relationship as above also occurs at the right tip 38b of the nail and 37d _-2 . Further, the left tip 38c of the claw and the notches 37d _-3 and 37d _-4 have the same relationship, but the rotating directions are all opposite.

Due to the claw 38 and the notches _{d-1 to} 37d _-4 , the cam plate 37 has three stop positions with respect to the swing lever 61.

Here, the load that the pawl 38 receives from the cam plate 37 has the elastic body 38a between the pawl 38 and the output shaft 39a of the motor 39, and therefore the elastic body 38a bends to be received by the inner wall 30a of the housing 30. . Therefore, an excessive load is not applied to the output shaft 39a of the motor 39.

Further, the central portion 35c of the piston 35 has an outer diameter smaller than that of both ends 35a and 35b, and forms an oil retainer 35d inside the pivot shaft 26.

 With the above configuration, this device operates as follows.

When increasing the arm pressure, as shown in FIG. 8, when the tension of the spring 25 is P and the distance between the tension P and the support shaft 21a is H, the lever 24 is rotated clockwise to increase H. Then, the pressurizing torque P × H becomes large. In this case, the cam plate 37 is rotated in the direction of raising the piston 35. This is to rotate the claw 38 in the clockwise direction in FIG. To lower the arm pressure, the claw 38 may be rotated counterclockwise and the piston 35 may be lowered.

 An example of control is shown in FIGS. 9 and 10.

FIG. 9 shows a control block diagram. The control circuit 51 includes a known stop position detection sensor built in the drive motor 50.
Signals from 52, the wiper switch 53, and the vehicle speed sensor 54 are input. The control circuit 51 processes these signals and controls the drive motor 50 and the motor 39.

The control procedure will be described with reference to the flow chart of FIG. The processing and judgment in each step in the figure are as follows.

S101; If the wiper (WP) is OFF, do nothing. If not OFF, proceed to S102.

S102; Initialization of each variable, CT1, CT2, CT3 are drive motors 50
This is a variable that counts the number of pulses output when the robot reaches the stop position by the signal from the stop position detection sensor of CT.
Is a variable indicating that low pressure (CT = 0), medium pressure (CT = 2), and high pressure (CT = 3) are set.

S103; If the vehicle speed is Vkm / h or higher, proceed to S126. Otherwise
Proceed to S104.

S104; If WPS / W is not OFF, proceed to S110. If you turn off S105
Proceed to.

S105 to S109: Steps for setting the pressing pressure to a low pressure.
That is, after rotating the motor 39 counterclockwise,
When the motor 50 exceeds the CT stop position, the motor 39 is stopped, and when it reaches the stop position, the motor 50 is stopped. As a result, the medium or high pressure setting is returned to the low pressure setting.

S110; If CT3 is 10, proceed to S103. Otherwise (CT3 <1
0) Go to S111.

S111; CT = 2.

S112; If CT2 = 3, proceed to S120, otherwise (CT =
0), go to S113.

S113 to S118; the step of changing the pressing pressure from low pressure to medium pressure. That is, after rotating the motor 39 in the clockwise direction for T1 time, the motor 39 is turned off for T2 time. After CT3 increases by 1, the motor 39 is turned on again in the clockwise direction for T1 time and the motor 39 is turned off for T2 time. The above operation is repeated 10 times. This repetition is for ensuring the engagement between the pawl and the cam 11 plate when the wiper operation is not smooth due to glass freezing or the like, and the number of times is appropriately set.

S119; CT2 = 0.

S120 to S125; the step of changing the pressing pressure from high pressure to medium pressure. That is, after the T1 time motor 39 is rotated counterclockwise, the T2 time motor 39 is turned off. The above operation is repeated 10 times. Here, turning off the motor once is
This is because the claws will move into the notches on the next stage if they are still rotated.

S126; If CT2 = 3, proceed to S103, otherwise proceed to S127.

S127; CT = 3.

S128 to S131: a step of setting the pressing pressure to a high pressure.
That is, after rotating the motor 39 in the clockwise direction, the motor 39 is stopped when the motor 50 exceeds the stop position three times.

S132: CT = 0.

Due to the mechanism, operation, and control contents described above,
This device keeps the arm pressure low when the wiper is stopped,
Also, the arm pressure can be medium when the vehicle speed is Vkm / h or lower, and the arm pressure can be high when the wiper is operating at the vehicle speed Vkm / h or higher.

In the above process, the arm pressure is switched by the timer control of the motor 39, but as shown by the broken line in FIG.
It is obvious that the cam position can be controlled by providing a limit S / W or the like on the cam plate 37 or the like.

Further, the control contents for the second and subsequent embodiments can be designed by a known technique according to FIG. 10 and will not be particularly described.

18 and 19 are perspective views of the mechanism around the cam plate and the mechanism around the pressure lever shown in FIGS. 1 to 4.

Second Embodiment In FIGS. 11 to 13, the pivot shaft 126 is pivotally supported by a boss portion 137a of a gear plate 137 which is pivotally supported by a housing 130 fixed to a vehicle front plate 128 by screws 129,
The washer 131 and the clip 132 are pivotally supported on the housing 130 so as to be rotatable. Further, the boss portion 137a of the gear plate 137 is provided with an oil sump 137b, and the pivot shaft 126 is provided with an oil sump 126a. A cam plate 138 shown in FIG. 17 is rotatably attached around the protrusion 126b of the pivot shaft 126. The cam plate 138, the washer 131, and the boss portion 137a of the gear plate 137 are connected by a pin 139 (FIG. 14) penetrating the washer 131 and always rotate integrally.

An end surface cam 138a is formed on the cam plate 138. Normally, the lever 124 receives the force of the pressure spring 125, and the rear end 124a of the lever 124 is made of an elastic body attached by a screw 140, and an end face cam 138a is provided via a locking tool 141.
Is pressed against.

The end surface cam 138a is a moving surface 138b that rotates the lever 124.
And the notch 141a of the locking device 141 at the stop position (Fig. 16)
It is constituted by a groove portion 138c which is fitted in. Therefore, when the cam plate 138 rotates around the pivot shaft 126, the end surface cam 138a rotates the lever 124. Further, since the notch 141a and the groove portion 138c are fitted to each other, the cam plate 138 does not rotate around the pivot shaft 126 unless a torque equal to or higher than an arbitrary set torque is applied.

A notch 13 is provided on the outer periphery of the flange of the gear plate 137.
7 _c-1 and 137 _c-2 are provided (Fig. 15). Notch 137 _c-2
Can mesh with a pawl 142 provided near the gear plate 137.

The claw 142 is a small motor 143 fixed to the housing 130.
Is attached to the output shaft 143a via an elastic body 142a.

The claw 142 and the notches 137 _c-1 and 137 _c-2 are adapted to engage with each other at any fixed position. For example, in the figure, when the pawl 142 is continuously rotated clockwise and the swing lever 161 is rotated counterclockwise, the left tip 142b of the pawl 142 meshes with the notch 137c _-1 . Then, the gear plate 137 comes to rest and only the swing lever 161 continues to rotate, so that the lever 124 eventually moves to the end face cam 138a.
It slips on the moving surface 138b and rotates. Swing lever 161
Notch 141a (Fig. 16) reaches the groove 13 when
Fits in 8c.

When the swing lever 161 starts rotating counterclockwise, the pawl 142
The right tip 142c is cut out by the outer peripheral edge of the gear plate 137.
It is pushed out from 37 _c-1 , and the left tip of the claw 142b and the notch 137 _c-2 disengage. The same relationship as above applies to the left tip of the nail 142b.
And notch 137 _c-1 , but the direction of rotation is opposite.

Here, the load that the pawl 142 receives from the gear plate 137 is the pawl 14
2 has an elastic body 142a between the output shaft 143a of the motor 143 and the elastic body 142a bends, the housing 130
Received at the inner wall 130a. Therefore, an excessive load is not applied to the output shaft 143a of the motor 143.

The operation is the same as that of the first embodiment, but the arm pressure switching of the first embodiment has three stages, whereas the present embodiment has two stages. Also, by adjusting the screw 140, the locking tool 141
The position of the lever 124 can be adjusted by bending. That is, the set arm pressure can be adjusted.

Further, FIG. 20 shows a perspective view of a main part in the second embodiment.

[Brief description of drawings]

1 to 10 show a first embodiment of the present invention.
The figure is a cross-sectional view of the main part taken along the line AA in FIG. 3, and FIG.
FIG. 3 is a sectional side view of the wiper device, FIG. 4 is a plan view of the wiper device, and FIG. 5 is a plan view of a vehicle front portion provided with the wiper device. 6 is a perspective view of a pressure lever, FIG. 7 is a perspective view of a cam plate, FIG. 8 is a conceptual diagram of a pressing pressure changing mechanism, FIG. 9 is a block diagram of a control unit, FIG. 10 is a control flowchart, 11 to 17 show a second embodiment of the present invention. FIG. 11 is a plan view of the wiper device, FIG. 12 is a sectional side opening of the wiper device, and FIG.
Portion of cross-section of main part along line C-C in the figure, FIG. 14 is D- in FIG.
FIG. 15 is a sectional view of an essential part taken along the line D, FIG. 15 is a sectional view of an essential part taken along the line EE of FIG. 13, FIG. 16 is a sectional view of a locking tool, and FIG. 17 is a perspective view of a cam plate. FIG. 18 is a perspective view showing a main part of a mechanism around the cam plate in the first embodiment, FIG. 19 is another perspective view of the pressure lever in the first embodiment, and FIG. 20 is a view of the second embodiment. It is a principal part perspective view. 20, 120 ...... Wiper arm 21, …… Face fixing member 24, 124, 224, 524 …… Pressure lever 25, 125 …… Spring member 26, 126, 526 …… Pivot shaft 35 …… Piston 37, 138, 238 , 538 …… Cam plate (cam member) 38,142 …… Claw 39,143 …… Motor (claw moving means) 21 137,537 …… Gear plate (ratchet gear) 543 …… Motor (rotational driving means)

Front page continuation (72) Inventor Toshiaki Shimokawa 14 Iwatani, Shimohakaku-cho, Nishio-shi, Aichi Japan Auto Parts Research Institute, Inc. (72) Inventor Satoshi Kuwamon 14 Iwatani, Shimohakaku-cho, Nishio-shi, Aichi Japan Auto Parts Co. In the laboratory (56) References Actual development Sho 61-150662 (JP, U) Actual public Sho 62-30535 (JP, Y1)

Claims (1)

(57) [Claims] 1. A fixing member (21, 121) provided on a pivot shaft (26, 126) reciprocally rotated by a rotation driving means (50) and integrally rotating therewith, and a fixing member (21, 121). One end is rotatably supported and is rotatable in a direction orthogonal to the rotation surface of the fixed member, and the other end is rotatably supported by the wiper arm (20, 120) holding a wiper blade, and the fixed member. A pressure lever (24, 124, 141) for changing the tension of a spring member (25, 125) stretched between the wiper arm and the wiper arm according to a rotating position, and a relative rotation about the pivot shaft. Cam surface (37a, 37b, 37c, 138a, 138) whose height changes in the pivot axis direction as it goes in the circumferential direction.
b, 138c) cam members (37, 138, 131, 137, 139)
And a locking member (35, 36, 141) that is connected to the pressure lever and has one end abutting against the cam surface. The cam member has a plurality of groove portions (37d _-1 , 37d _-2 , 37d
_-3 , 37d _-4 , 137c _-1 , 137c _-2 ) and is provided with a claw (38, 142) that can be engaged and disengaged with the groove, and a drive unit (39, 143) that drives the claw. During a normal wiper wiping operation, the cam member and the pivot shaft are integrally rotated by the drive means, while the pawl is engaged with the groove portion of the cam member when the tension of the spring member is changed. When the cam member is stopped, the pivot shaft is rotated by the drive means, and the position of the locking member that contacts the cam member is changed to change the rotational biasing force of the wiper arm. Wiper device for vehicles.