JPS6387346A - Expansion arm type window wiper - Google Patents

Abstract

PURPOSE:To aim at the extension of a wiping area, by rotating a main frame by a motor, while shifting different diametral gears and racks via the crank installed solidly with the turning shaft, and making a slide frame so as to be slidden. CONSTITUTION:At the wiper operation, an arm driving shaft 33 is rotated by a driver 38, and the main frame 21 locked to this shaft 33 is rocked within the range of the specified angle. And, a crank driving shaft 25 extending as piercing through a center hole of the arm driving shaft 33 is rotated, and the crank member 26 installed in the upper end is rotated as well. With this rotation, a second rack 74 is pushed out via a rod 96, while a pinion 81 of different diametral gears 24 is rotated, and simultaneously a first rack 71 is pushed out to the right at high speed. With this constitution, the slide frame 23 connected to the first rack 41 is largely shifted more than the ordinary position, thus a wider area is wiped clean by a wiper blade.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a telescoping arm type windshield wiper.

[Prior art]

Examples of conventional telescopic arm type windshield wipers include those shown in FIGS. 9 and 10 (see Japanese Patent Application Laid-Open No. 58-8445).

That is, the windshield wiper 1 has a main frame 4 fixed to an arm drive shaft 3 supported by a vehicle body 2 and rotatable by a motor (not shown), and slides in the length direction with respect to the main frame 4. It consists of a slide frame 6 that can be fitted together and connected to a brush holder 5. Then, when the arm drive shaft 3 and the coaxial binion 7 are engaged, the onion 8 is engaged.
meshes with an internal gear 9, and the size of the housing 10 in which the internal gear 9 is formed is such that the length of the push rod 11 is equal to the length from the arm drive shaft 3 to the pinion 8. The push rod 12 is articulated at one end to the push rod 11 and connected to the slide frame 6 at the other end.

In addition, 13 is a bellows, and 14 is a cover.

Further, 15 is a rotation locus of the slide frame 6, 16 is a rotation locus of the push rod 11, and 17 is the other rotation locus of the push rod 12.

[Problems to be solved by the present invention]

However, according to such a configuration, if the length from the arm drive shaft 3 to the brush shifter 5 is 700 mm, and the amount of movement l of the brush shift 5 is 70 mm (10%), the length from the arm drive shaft 3 to the brush shift lever 5 is 70 mm (10%). The length S to the pinion 8 is 35 mm, which is half of 70 mm, and the diameter of the housing 10 is approximately 100 mm due to the relationship between the pinion 8 and the internal gear 9.

For this reason, the housing 10 becomes significantly large.
This requires a large amount of space for the mounting part and spoils the aesthetics, so a countermeasure has been desired.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a windshield wiper in which the diameter around the wiper drive shaft is reduced and the amount of movement of the brush center is increased.

[Configuration of the present invention]

In order to achieve such an object, the present invention provides a main frame rotatably supported by a vehicle body and fixed to a hollow arm drive shaft rotatably driven by a drive device disposed within the vehicle body; A slide frame is slidably fitted in the main frame in the longitudinal direction and connected to the brush center, and a slide frame is disposed facing each other in the main frame, both of which are slidable, and one of which is slidably fitted to the main frame and connected to the brush center. a rank connected to the slide frame; a gear of different diameter formed by a large gear meshing with the one connected to the slide frame of the rank and a small gear meshing with the other; installed in the hollow part of the arm drive shaft; A crank drive shaft rotationally driven by the drive device, and a rod at the upper end of the crank drive shaft, which is disposed within the main frame and is not connected to the shaft of the different diameter gear and the slide frame, respectively. The crank member is connected through the crank member.

[For production]

Therefore, according to the present invention, by rotating the arm drive shaft and the crank drive shaft by the drive device, the main frame rotates around the arm drive shaft, and the different diameter gear and the rack are pushed out via the crank. Since the slide frame moves in the direction of increasing the wiping area, the slide frame moves in the direction of increasing the wiping area.
Since only the rack, gears with different diameters, and crank are installed, the main frame can be made smaller.

〔Example〕

A first embodiment of the present invention will be described using FIGS. 1 to 3.

The telescopic arm type windshield wiper 2o includes a main frame 21, a slide frame 22, a rack 23, a different diameter gear 24, a crank drive shaft 25, and a crank member 26.

The main frame 21 is fixed to a hollow arm drive shaft 33 inserted into a through hole 3o of the vehicle body 290 via a packing 31 and a motor shaft tube 32 with a washer 34 and a naphut 35. 36 and 37 are this arm drive shaft 33
These are nuts and washers arranged for fixing the vehicle body 29 to the vehicle body 29. The lower end of this arm drive shaft 33 is
It is connected to a drive device 38 disposed within the vehicle body 29. That is, the drive device 38 is the motor 4 disposed in the casing 40.
1, and a worm shaft 4 directly connected to the shaft 42 of the motor 41.
3, and the worm 44 of the worm shaft 43 is the worm gear 4.
The lever 4 meshes with the worm gear 45 and is directly connected to the worm gear 45.
9, the lever 49 and the fan-shaped rough black 0 are the joint 50.
The fan-shaped rack 60 has a wiper swing gear 62,
The first crank drive gears 63 are independently meshed with each other. The wiper rocking gear 62 is coupled within the casing 40 to a tubular arm drive shaft 33 that passes through the motor shaft tube 32 . The first crank drive gear 63 is connected to the second crank drive gear 6 via a coaxial relay gear 64.
It meshes with 5. The crank drive shaft 25, which is directly connected to the second crank drive gear 65 within the casing 40, passes through the tube of the arm drive shaft 33, and protrudes outward beyond the arm drive shaft 33 outside the casing 40. . The wiper bearing 27 and the arm drive shaft 33 are spline-fitted. 66 is a support shaft of the fan-shaped rack 60.

Further, 39.48 is a bearing, and 46 is a worm gear shaft.

The slide frame 22 is fitted to the main frame 21 so as to be slidable in the length direction, and the brush sesoto 6
1 is connected and supported.

The racks 23 are disposed on the upper and lower surfaces of the main frame 21 so as to be slidable in the longitudinal direction, and the upper first rack 71 has teeth 72 on the lower surface and is connected to the slide frame 22 with a pin 73. The second rack 74 has teeth 75 on its upper surface.

The different diameter gear 24 is a small gear 81 that meshes with the second rack 74.
and a large gear 82 that meshes with the first rack 71 are integrally formed, and the diameter of the large gear 82 is twice that of the small gear 81.

The crank member 26 is connected to a crank body 91 supported by a crank socket 28 that is splined into the upper end of the crank drive shaft 25 protruding into the main frame 21, and to one of the crank bodies 91, and is connected to the different diameter gear. It is rotatably connected by a pin 94 to a cylindrical portion 93 of a bifurcated bracket 92 that supports the shaft 76 of 24. The tenth node 95 is connected to the other side of the crank body 91, and the second
A 20th rod 9 whose other end is connected to a rack 74 by a pin 77
6 and more.

Therefore, the worm 44 driven by the motor 41 rotates the worm gear 45, and the lever 49 always rotates in a fixed direction. Since this lever 49 is rotatably connected by a rod 51, rotation of the lever 49 causes the fan-shaped rack 60 to be rotated within a limited rotation angle of 180° or less (usually 90″).
(appropriate) range. By appropriately selecting the diameter of the wiper rocking gear 62 meshed with the fan-shaped rack 60, the main frame 21 can be rocked by a necessary angle.

On the other hand, the first crank drive gear 63 meshed with the fan-shaped rank 60 has a diameter smaller than that of the wiper swing gear 62 and is connected to the second crank drive gear 65 via a relay gear 64 having a larger diameter. Because of the rotation, the rotational speed of this gear 65 is higher than the rotational speed of the wiper oscillating gear 620, but since these gears 62 and 63 are meshed with the same fan-shaped rack 60, the gear 62 and the relay gear 64 are The rotation speed ratio between the gear 63 and the second crank drive gear 65 that meshes with each other is always constant.

Therefore, when the main frame 21 is swung by the wiper drive shaft 33, the crank member 26 fitted to the crank drive shaft 25 rotates in synchronization with the main frame 21.

1st. Crank body 9 supporting the 20th rod 95.96
The diameter of 1 is 20 mm, and the total length of the wiper is 70 mm.
When it is 0 mm, the expansion/contraction length is 20X (
1+2X2) = 100, that is, a movement of 100 mm is possible, and the expansion/contraction ratio is 14%.

Compared to the conventional example, this increases by 30 mm and 4%.

Next, FIGS. 4 and 5 show a second embodiment of the present invention,
The main difference is that the support shaft of the fan-shaped rack and the arm drive shaft are integrated, and the number of gears is reduced by one.

That is, the fan-shaped rack 100 is formed to protrude from the arm drive shaft 102, and the crank drive gear 104 that meshes with the fan-shaped rack 100 is vertically thick, so that the relay gear 10
6, the crank drive shaft gear 108 is rotated via this relay gear 106, and the crank drive shaft 25 integral with this gear 108 is rotated.

110 is a bearing that supports the relay gear 106.

6 to 8 show a third embodiment of the present invention, and the main difference is that a fan-shaped rack is not used, but a linear rank is used, and the width of the casing 40 is made narrower. be.

That is, 115 is a linear rack, and casing 1174
The rack guide 116 is arranged to slide within a rack guide 116 fixed to the rack guide 116. The teeth 118 of this rack 115 have
First crank drive gear 63 and wiper swing gear 62
are engaged.

The shaft 120 of the first crank drive gear 63 has a relay gear 1
22 is formed, and the second crank drive gear 65 meshes with this relay gear 122. The crank drive shaft 124 is provided upright on the second crank drive gear 65 . A crank drive gear 126 is spline-fitted to the upper end of the crank drive shaft 124 and screwed with a nut 128. A wiper drive shaft 130 is inserted into the hollow portion of the crank drive shaft 124.
The upper end of the nut 13 penetrates through the main frame 21.
It is concluded in 2.

134 is a wiper bearing. 136 is a button protruding from the main frame 21 to the inside of the main frame 21.
A gear 140 is rotatably supported by a pin 138 in the keft. A tenth pin 95 is connected to this gear 140 by a pin 142. 144 is a bearing fixed to the lower surface of the main frame 21, and a shaft 146 allows
A gear 148 is rotatably supported, and the 20th hood 96 is connected by a pin 150. This gear 140, 1
48 meshes with the crank drive gear 126.

〔effect〕

As described above, according to the present invention, the amount of movement of the slide frame can be increased compared to the conventional one, so that the wiping area is expanded and the forward visibility is improved.

Also, since the root of the main frame becomes smaller, it becomes smarter and the aesthetic appearance is significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of essential parts of a telescoping arm type windshield wiper according to a first embodiment of the present invention, and FIGS. 2 and 3 are sectional views taken along lines nn and mm in FIG. The figure shows the second aspect of the present invention.
FIG. 5 is a sectional view of main parts of a telescoping arm type windshield wiper according to an embodiment, FIG. 5 is a sectional view taken along line N-N in FIG. 4, and FIG. The principal part sectional views, FIGS. 7 and 8, are taken along the line ■-■ in FIG. 6. A sectional view taken along the line 1--2, FIGS. 9 and 10 are a sectional view of a main part and an explanatory front view of the conventional example. 20... Telescopic arm type window wiper, 21
... Main frame, 22 ... Slide frame, 23 ... Rack, 24 ...
・Different diameter gear, 25.124...Crank drive shaft, 26...Crank member, 29...Car body, 33°102...Arm drive shaft, 38...
...drive device, 61...brushisesoto,
81... Small gear, 82... Large gear.

Claims (1)

[Claims] A main frame that is rotatably supported by the vehicle body and fixed to a hollow arm drive shaft that is rotationally driven by a drive device located inside the vehicle body, and a main frame that slides in the length direction with respect to the main frame. a slide frame that is movably fitted and connected to the brush set; a rack that is arranged facing each other in the main frame, both of which are slidable, and one of which is connected to the slide frame; and the rack. a gear of different diameter formed by a large gear that meshes with the one connected to the slide frame and a small gear that meshes with the other; and a crank drive shaft that is installed in the hollow part of the arm drive shaft and rotationally driven by the drive device. and a crank member disposed within the main frame at the upper end of the crank drive shaft and connected to the shaft of the different diameter gear and the rack that is not connected to the slide frame, respectively, via rods. A telescopic arm type windshield wiper.