JPS62225451A - Arm expansion type wiper - Google Patents

Abstract

PURPOSE:To reduce the size of an expansion and contraction mechanism and ensure a sufficient expansion and contraction amount and to smooth motion even at a high speed operation, by a method wherein a cardan gear mechanism, coupled to the terminal of the tip part of a wiper arm and expanding and contracting the tip part, is situated to the base end part of the wiper arm. CONSTITUTION:With an arm driving shaft 2 of a wiper actuated, a wiper arm 1 is driven through its base end part 10, and is swung to wipe off a windscreen glass. In this case, a cardan gear mechanism 30 is swung togetherwith the base end part 10 of the wiper arm. The gear train of the gear mechanism 30 is rotationally driven during swing of the arm base end part by means of a gear member 31, secured so as to prevent the member from swing togetherwith the arm base end part 10, and rotational driving is converted into linear driving to expand and contract the tip part 20 of the wiper arm. As noted above, the wiper arm 1 is expanded and contracted according to a pattern, set by the cardan gear mechanism 30, as it performs swing movement, and its wiping area is increased. Further, the expanding and contracting amount of the wiper arm 1 can be sufficiently increased as against the size of the gear train, and the size of an expansion and contraction mechanism part can be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a wiper with an extendable arm that extends and contracts the wiper arm to enlarge the wiped area of a vehicle windshield.

Conventional technology: A wiper device capable of wiping the windshield of a vehicle with a large aspect/width ratio by extending and contracting the wiper arm was developed in 1976-14.
1927, JP-A-52-141928@13, and JP-A-58-8445.

These known wiper devices have a lower end fixed to an arm drive shaft for rocking motion and a WJ for this lower end.
In both cases, a wiper arm is formed with a movable tip, and a telescoping mechanism is provided between both ends of the arm so that the tip of the arm can be expanded and contracted with rocking motion. In addition, as a telescopic mechanism, a guide groove device for sliding the end of the tip of the arm is disclosed in Tokusho 1m No. 52-141927, and
No. 141928 and No. 58-8445 use a device in which the rotational motion of a gear is converted into linear motion by a crank arm.

Problems to be Solved by the Invention However, according to the above-mentioned known configuration, the range of the guide groove when the wiper arm extension/contraction m is as in JP-A-52-141927, and the range of the guide groove as in JP-A-52-141,928. The distance is twice the distance between the center of the transfer gear and the crank arm connection point on the same gear, and in Japanese Patent Application Laid-Open No. 58-8445, it is limited to the length of the crank arm and is relatively small. Therefore,
If the wiper arm requires a large amount of expansion and contraction, the expansion and contraction mechanism becomes large, which poses a problem in terms of installation on a vehicle.

Furthermore, in the configurations of these known techniques, since the direction of movement of the telescopic tal structure and the direction of expansion and contraction of the wiper arm do not necessarily match, the sliding resistance when the wiper arm is expanded and retracted is large, and the load on the motor is increased. many. For this reason, there is a possibility of the wiper motor locking, especially when the wiper device is operated at high speed.

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, an object of the present invention is to provide a wiper with a telescoping arm that has a compact telescoping mechanism, can secure a sufficient amount of telescoping, and operates smoothly even at high speeds. do.

20 Means and Effects for Solving the Problems For the above-mentioned purpose, according to the present invention, a wiper with a telescoping arm is provided,
The wiper arm consists of a proximal end attached to the wiper arm drive shaft for IJJ movement and a distal end that can be slid in the longitudinal direction by the guidance of this proximal end, and the wiper arm is connected to the distal end of the wiper arm distal end. A cardan gear am that expands and contracts the tip is provided at the base end of the wiper arm, and this cardan l! The 1tlJ mechanism is characterized by including a gear train that is rotationally driven when the wiper arm swings by a gear member fixed relatively to the drive shaft so as not to swing together with the base end, and converts the rotational drive into linear drive. A retractable arm wiper is provided.

With J3 in the above configuration, when the wiper arm drive shaft operates, the wiper arm moves! & is driven through the end and performs a rocking motion to wipe the vehicle windshield. At this time, the cardan gear mechanism swings together with the base end of the wiper arm. The gear train of the gear mechanism is rotationally driven by a gear member fixed so as not to swing together with the base end of the arm, and converts the rotational drive into linear drive to extend and retract the tip of the wiper arm. In this way, the wiper arm moves in an oscillating manner and expands and contracts according to the pattern determined by the Cardan gear mechanism, thereby increasing its wiping area.

E. Embodiments Next, the present invention will be described based on embodiments shown in the accompanying drawings.

FIG. 1 and FIG. 2 each show the main parts of a wiper according to an embodiment. The wiper has a wiper arm 1 disposed in relation to an arm drive shaft 2, and the drive shaft 2 is driven by a wiper motor mounted on a vehicle body etc. via a link device "a" (none of which is shown). Reference numeral 3 designates a pivot housing supporting the drive shaft 2;
It is fixed in tI body etc. The wiper arm 1 is composed of a base end 10 fixed to a drive shaft 2 for rocking movement, and a distal end 20 slidably attached to the base end.

The base end 10 of one Neuba arm includes an arm base 11 attached to the arm driving OJ shaft 2 so as to rotate together, and a case 12. The case 12 is formed so as to be separable into upper and lower parts with the arm base 11 in between, and is fixed to the arm base 11 with screws or the like after each case part is engaged. On the other hand, the tip 20 of the wiper arm is connected to the wiper head 2.
1 and a rod 2 with one end fixed to this wiper head.
Contains 2. The distal end portion 20 is connected to the proximal end portion 10 by passing the rod 22 through the guide hole 13 formed in the arm base 11.
It is assembled so that it can slide freely.

A bellows 14 made of a flexible material is mounted between the case 12 at the proximal end of the arm and the wiper head 21 at the distal end of the arm. Further, a retainer 23 is attached to the tip of the wiper head 21 so that it can be bent around the rivets 1 to 24, etc., and the wiper blade (
An arm piece 25 for supporting the robot (not shown) is fixed. Further, a pin 26 is provided at a position a on the opposite side of the rivet 24 at the tip of the wiper head 21, and a tension coil spring 27 is installed between the pin 26 and the end of the arm piece 25 to move the arm piece 25 to its extended position. It holds the wiper blade in place and provides pressing force to the wiper blade.

A Cardan gear mechanism 30 is provided within the proximal end 10 as a wiper arm telescoping mechanism. Gear mechanism 30 of this embodiment
comprises a gear train including a second driving gear 33 which functions as a stationary sun gear of a so-called Cardan gear system, an idler gear 34 and a driven tooth width 35 which functions as a planetary gear. Further, a first drive gear 32 and a gear member 31 are provided to drive this gear train.

That is, the gear member 31 has internal teeth and is fixed to the outer periphery of the fan-shaped flange 3a formed on the pivot housing 3 at a position below the arm base 11 with screws or the like.
First drive! lJl! The a-wheel 32 meshes with the internal teeth of the gear member 31. The first drive gear 32 is rotatably supported by the arm base 11 of the wiper arm, and its shaft extends above the arm base 11 and is fixed to a plate 36. On the other hand, the second drive gear 33 is fixed on the arm base 11 by screws or the like at a position concentric with the first drive gear 32. The idler gear 34 and the driven gear 35 are the idler gear 3
4 is arranged in meshing engagement with the 7A2 drive skewer 32, and this idler tooth width 34 and the subordinate ΔJ gear 35 are arranged in meshing engagement; d
Let's play freely together! - Supported by 36.

The shaft of the slave 1'JJ m wheel 35 extends above the plate 36 and is fixed to one end of a crank arm 37, and the other end of the crank arm 37 is connected to the end of the rod 22 by a pin 4 so as to be relatively rotatable. Ru.

Next, the operation of this embodiment will be explained with reference to the drawings from FIG. 1 to FIG. 3. When the wiper motor operates and drives the shaft 2 through a linkage device (none of which is shown), the arm base 11 is driven to move the wiper arm 1 to lti l.
h L/ Wipe the vehicle's 1-cooled shield glass with the wiper blade (not shown) attached to the tip.

Along with this rocking, the first
Kakeru? The JJ gear 32 rolls along the gear member 31 in the rest position, rotating the plate 36 around the axis of the first drive gear 32.

In this embodiment, it is assumed that when the arm base 11 moves I:fi from the AI position to the B position in FIG. 2, the first driving wheel 32 rotates twice along the gear member 31.

As the plate 360 rotates, the idler gear 34 rotatably supported by the plate 36 moves to the second drive 1! While engaging with the IIJ opening 33 and rotating, it revolves around the second drive tooth 1I33 twice. Similarly, the driven tooth width 35 also rotates on its own axis due to the drive of the idle gear 34, and then moves to the second drive! It revolves around lJr@Naka33. Here, the ratio of the diameters of the second driving gear 33 and the driven gear 35 is set to 2:1 according to the conditions of cardan gear equipment, and on the other hand, the distance between the centers of the second driving gear 33 and the driven gear 35 is It is set equal to the effective length of the crank arm 37, that is, the distance between the centers of the driven tooth 1a35 and the pin 4. Therefore, when the arm base 11 swings from the 8th position to the 8th position in FIG. The wiper arm distal end portion 20 is expanded and contracted twice.

The above operation is schematically shown in FIG. 3, and the angle shown in the figure represents the revolution angle of the driven gear 35 with respect to the second drive tooth [1133]. Second drive gear 33 and subordinate fh teeth! i
Diameter relationship with 35, these gears and crank arm 3
The relationship between the center-to-center distances 7 is as described above, and as seen in FIG. 3, the driven teeth 35 rotate in the direction opposite to the revolution direction over an angle twice the revolution angle. Therefore, subordinate
Similarly, the crank arm 37 fixed to the tooth center 35 is
With respect to a straight line connecting the centers of the second driving gear 11133 and the driven gear 35, the driven gear 35 rotates in the same direction as the rotation direction of the driven gear 35 by its rotation angle. As a result, the center of bin 4 1)
moves in a straight line as shown in Figure 3, and the following l1lJl! I
Each time the width 35 revolves once, it performs one reciprocating linear movement.

FIG. 4 does not show the wiping pattern by the wiper of this embodiment.

The wiper arm extension mechanism Zunawara Cardan gear mechanism 30 is arranged so that the wiper arm extends the most at the left and right upper portions of the windshield glass, and the wiper arm becomes the shortest at both the wiper inversion and neutral positions ff - KN ff
I will be treated. Therefore, the main area of the windshield glass having a large aspect ratio (vertical/width ratio) can be wiped with a single-arm wiper.

8. Effects of the Invention As is clear from the description of the above-mentioned embodiments, in the wiper of the present invention, the wiper arm expands and contracts as the wiper arm swings, thereby expanding the wiped area and ensuring good driving visibility. . In addition, the amount of expansion and contraction of the wiper arm is sufficiently large compared to the size of the gear train (in the case of the embodiment, the stroke of the center P of the bin 4 is the distance between the driven m ttI and the center of the bin, that is, the distance of the crank arm 37). (4 times), the telescoping mechanism can be made smaller.

In this connection, it should be considered that in the above-mentioned known technology that uses a crank mechanism, the dimensions of the gear device, especially the internal gear, must be increased in consideration of the crank arm, etc. to be built therein. In contrast, in the tooth m mechanism of the present invention, only the size relationship of the gears is regulated, but the dimensions themselves are not regulated, and the mechanism portion can be made smaller relatively easily.

Furthermore, in the wiper of the present invention, since the connecting portion between the cardan gear mechanism and the wiper arm tip performs a linear motion in a linear manner, it is less likely to apply force other than the direction of expansion and contraction to the wiper arm tip, and the wiper high-speed operation port , J3 can be smoothly extended and retracted, and the load on the wiper motor can be reduced. As described above, according to the present invention, it is possible to provide a telescoping arm wiper that is effective in ensuring a good visibility of movement, and is small in size and has a 4VJ construction and has poor operational reliability.

[Brief explanation of drawings]

Fig. 1 d3 J: and Fig. 2 show a side view J'3 and a plan view of the essential parts of the telescoping arm wiper of the present invention, respectively, and Fig. 3 shows the operation of the gear mechanism in the wiper of Fig. 1. FIG. 4 is a schematic diagram showing a wiping pattern by the wiper of FIG. 1. In the figure, 1... wiper arm, 2... drive shaft, 10... base end, 20... distal end, 30... Cardan gear mechanism, 31...
...Gear member, 32...First drive gear, 33.
...Second drive gear, 34...Idler gear, 35...Slave A gear.

Claims (3)

[Claims] (1) The wiper arm is a telescopic wiper, and the wiper arm is composed of a base end attached to the arm drive shaft of the wiper for swinging motion, and a distal end that is slidable in the longitudinal direction by the guide of the base end. , a cardan gear mechanism is provided at the base end of the wiper arm, and the cardan gear mechanism is connected to the end of the tip of the wiper arm to extend and retract the tip, and the cardan gear mechanism is arranged relative to the drive shaft so as not to swing together with the base end. A telescoping arm wiper comprising a gear train that is rotatably driven when the wiper arm swings by a fixed gear member to convert the rotary drive into linear drive. (2) In the arm telescoping wiper according to claim 1, the gear member includes internal teeth, and the gear train includes:
a first drive gear rotatably supported by the base end and meshing with internal teeth of the gear member; and a second drive gear disposed coaxially with the first drive gear and fixed to the base end. and a driven gear meshing with the second driving gear via an idler gear, the driven gear having a diameter half that of the second driving gear, and the driven gear and the idler gear meshing with the first driving gear. The cardan gear mechanism and the wiper arm tip are rotatably supported by a support that is fixed to the gear and rotates together with the first drive gear, and the cardan gear mechanism and the wiper arm tip are fixed at one end to the shaft of the driven gear and the wiper arm tip at the other end. A wiper with a telescoping arm, characterized in that the wiper is connected by a crank arm pivotally connected to an end of the wiper. (3) In the arm telescoping wiper according to claim 2, the distance between the centers of the second drive gear and the driven gear is the distance between the center of the driven gear and the end of the tip of the wiper arm. A telescopic wiper with an arm that is equal to the length of the crank arm.