DE2550369A1 - CRANK DRIVE FOR SINGLE ARM WIPER WIPER WITH MULTIPLE WIPER ANGLE - Google Patents

Description

Fabbrica Italiana Magneti Marelli S.p.A., Vie G-uastalla 2, Milano, Italy

Crank drive for single-arm windshield wipers with multiplication

of the wiping angle

The present invention relates to a crank mechanism for windshield wipers with a single wiper arm, a translation being provided to multiply the wiper angle.

These crank drives allow the wiper blade to wipe angles of more than 120 °, i.e. a larger wiping range than with the conventional devices with a connecting rod-crank-oscillating axis is achievable «, The multiplication ratio of the wiping angle is between the connecting rod and the Rocker arm provided and has in the known crank mechanism ben an auxiliary rocker arm, which is attached to the pivotable end of the Connecting rod is articulated and has a reversing lever This is also articulated to this end and to the main rocker arm, which in turn is attached to the wiper arm «,

The pivot point of the auxiliary swing arm is from the pivot point of the The main rocker arm is different, so that this rocker arm and the deflecting rod form an articulated square with five pivot pins form·

However, these known crank mechanisms are quite bulky, so that they can hardly be used in vehicles with little space. In addition, they do not allow large wiping angles

The space requirement depends on the distance between the axes of rotation of the two rocker arms, which increases when the wiping angle changes.

609826/0847 original inspected

should be increased, the space requirement then also increased accordingly

The known crank mechanisms also make the use of metal rods necessary in order to be able to absorb the bend that occurs due to its length. In addition, they are coupled with bushings to prevent rapid wear and tear. Also requires the quadrilateral due to the arrangement of the tenon a suitable support plate with which the tenon in the (Hessen from a Piece is made.

The present invention is based on the object of creating a crank drive for windshield wipers with kinematics for multiplying the wiping angle, with the crank mechanism requires little space, enables a wiping angle of up to 180 ° and the space requirement is practical remained unchanged

Another object of the invention is to provide a cure Beltriebs, which allows the use of a simple sheet metal disc as a (stamp for the mechanism and the motor gear.

Finally, another task is to create an economical and noiseless crank mechanism

According to the invention, this is achieved by means of a crank drive for windshield wipers with a multiplication ratio which the axes of rotation of the main rocker arm and the additional rocker arm coincide and the connecting rod at their Pivoting is provided with an approach which has two hinges with offset, parallel axes of rotation, namely one for connection to the auxiliary rocker arm and the other to the coupling with the deflection rod, whereby the connection of the hinges, the two rocker arms and the deflection rod are an articulated, Form a closed square and where the distance between the

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Axes of the hinges and / or the angle formed by the straight line passing through them and the axis of the connecting rod is formed, is set in relation to the desired wiping angle.

According to a "preferred embodiment of the invention in order to achieve a noiseless and economical crank drive, at least the auxiliary rocker arm and also the deflection rod made of plastic

The invention is made with reference to the accompanying drawings explained in more detail.However, these drawings only show a preferred embodiment of the invention.

Show it:

1 shows the arrangement of the connecting rods in the right end position of the wiper blade;

Figo 2 shows the arrangement of the rods in the left end position of the wiper blade}

3 shows an embodiment of the multiplier kinematics for the Wiping angle;

Fig. 4 shows the connecting rod of the crank mechanism;

FIG. 5 shows the section through the kinematics of FIG. 1 along the section line VV ₀

In Figures 1 and 2, 1 is the crank set in rotation by the motor hedging gear (which is a reducer not shown), with the 2. the connecting rod and with 3 the with the rocker arm 4 connected to the wiper blade support arm. The support arm rotates about the axis of rotation 5o

The connecting rod 2 transmits the drive to the wiper blade support arm 4 by means of a transmission gear for multiplication

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-H-

tion of the wiping angle, which according to the invention consists of four articulated rods 6, 2 ¹ , 7 and 3 ", which" form "a closed, articulated square with four pivot pins. .

The rod 6 forms with an auxiliary rocker arm, the _r is the same D ehachse 5 as the main rocker arm 3 rotates and is hinged to the free, moving end of a first pin 8 of the connecting rod 2 ·

The deflection rod 7 is at one end to a pin 3 * of the rocker arm 3 and at the other end to a second Pin 9 <ier connecting rod 2 articulated

The pins 8 and 9 are provided on an extension 2 ^{1 of} the connecting rod 2, which is shown in the drawing as being offset by 90 ^{1 from} the connecting rod.

provided in the drawing as 90 ° relative to the axis

The fact that both the main rocker arm and the auxiliary rocker arm 6 rotate about the same axis of rotation 5 enables the formation of transmissions with very little space requirement, the space requirement being approximately half the space requirement of comparable conventional devices _{or the like}

This space requirement remains practically constant, regardless of the range of the wiper angle. The range of the wiper angle is ^{dependent on the length of the rod or the extension 2 1} and on the angle that the extension forms with the connecting rod 2.

The area can with a simple adjustment of the length of the extension 2 · or its inclination to the connecting rod 2 can be increased.

The formation of the translation with a rod or an extension 2 ·, which is offset by 90 ° to the connecting rod 2, corresponds to

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the optimal solution, because the largest multiplication of the angles is achieved with the same dimensions »This also applies to the symmetry of the movement of the rocker arm in the circumferential area between two dead points «,

In this case the laws of speed change remain and the acceleration of the wiper blade in both directions (there and back) of the wiped surfaces practically the same

However, this does not exclude that other proportions are used in order to achieve special effects the system offered

The connecting rod 2 is preferably made of metal, while the auxiliary rocker arm 6 and the deflecting rod 7 are made of plastic. Characterized the rods 6 and 7 immediately to the associated pins or · pin 3 ", 9 and 5 is placed, that is, without the interposition of bushings · Thereby, economic advantages, Z ₀ B ₀ simplicity of manufacture and of assembly, and low number of Components as well as noiselessness in operation

Another advantage of the crank mechanism is that a simple sheet metal disk can be used as a bearing for the mechanism, since there are no longer any problems with holding the pin of the auxiliary rocker arm.

The exemplary embodiment relates to an embodiment with a two-way connecting rod on the port set 2 ¹ and the pivot pins 8 and 9f, although the pins can also be provided on the rods 6 and 7. In any case, the connecting rod must have two joints or hinges «

Expectations

609826/0647

Claims (3)

Expectations 1) ^ Crank drive for one-armed windshield wipers with one device to multiply the wiping angle of the wiper blade, with an auxiliary swing arm for guiding the movement of the Pivoting end of the connecting rod and a reversing rod are provided, which the end with the main rocker arm on Wiper arm connects, characterized in that the rotary « axis of the main rocker arm coincides with the axis of rotation of the auxiliary rocker arm and that the connecting rod to its pivoting end has an extension that is connected by two hinges with parallel, axially offset axes of rotation. can be seen, one of which is responsible for the connection with the auxiliary Swing arm and the other for the connection with the deflection · - » rod is provided, wherein the two rocker arms and the deflection rod form an articulated, closed quadrangle in which the distance between the axes of the hinges and / or the angle O = O, which is determined by the straight line runs through the same and the axis of the connecting rod ge » is fixed in relation to the desired wiping angle be placed, 2) crank drive according to claim 1, characterized in that the connecting rod is made of metal and its extension has two pins for articulation with the auxiliary rocker arm » wherein the auxiliary rocker arm and the reversing rod made of plastic exist,, 3) crank drive according to claim 1 and 2 _f, characterized in that the extension is integrally formed with the connecting rod » S09826 / 0647