JPS5832057B2 - movably mounted rearview mirror adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a device for adjusting a movably mounted element, in particular a rearview mirror in a motor vehicle, an embodiment comprising the features of the preamble of claim 1. It is based on

In a known device for actuating a rear-view mirror of a motor vehicle, a motor-driven worm shaft is provided with a running nut as an adjusting member, in order to separate the worm gear shaft from the worm when the adjusting power is raised to a certain height. The running nut is designed to be radially resilient such that its diameter is variable.

In this embodiment, the worm gear shaft can even pivot completely when the adjusting member moves against the limiting stop, since the diameter of the running nut then increases. 6 Moreover, the worm gear shaft is obstructed. When it is done,
The movable member can be adjusted manually, since the running nut can skip a certain number of screws due to its elasticity.

A disadvantage of this embodiment is that manual adjustment of the movable elements is not possible with the necessary precision.

Only several closed positions of the running nut are possible, whereby the distance between the two closed positions depends on the pitch of the thread of the worm shaft.

Furthermore, in this embodiment the required manual adjustment forces are relatively high and, in particular, are very variable, so that in practice it often happens that the running nut jumps over the desired stop position.

Finally, the chatter that occurs when the running nut hits a stop during manual operation is inconvenient.

The object of the invention is to create a regulating device which is simple in design and equipped with an overload protection device.
Manual adjustment is possible and adjustment to any desired position is possible with low energy consumption.

On the other hand, it must of course be ensured that the movable element is held safely in the adjusted position.

This problem has been solved by the present invention by the features mentioned in the characterizing part of claim 1.

The invention is thereby based on the principle that a gear wheel meshing with a freely rotatable worm shaft can also roll on the worm shaft when the worm shaft is blocked.

On the other hand, if rotation of the gear is prevented, said gear is adjusted parallel to its axis of rotation by rotating the worm shaft.

The brake therefore serves to arrest the gear when the adjustment is performed by the electric motor.

The braking force is now adjusted in such a way that the braking force is no longer sufficient to stop the gear when the adjusting member hits the stop.

When the movable element is to be adjusted manually by the action of a force, the braking force will not be large enough to arrest the gear.

All these requirements are met if the brakes act independently of torque, thereby making force-locking or form-locking embodiments possible.

The locking embodiment is characterized in that a spring element, for example a disc spring, presses the front face of the gear against a friction area on the member during adjustment.

In a form-locking embodiment, the front side of one of the gears can be provided with teeth, which co-operate with corresponding teeth on the adjusting member.

Continuous manual adjustment of the movable element is then not possible, but the steps are much smaller compared to known embodiments.

In an embodiment of the invention according to the features of claims 1 and 2, the gearwheel is pressed resiliently against the worm shaft, so that the spring action can also be achieved by a corresponding design of the rocker arm itself. It is possible.

Thereby, independently of the pitch of the worm shaft, the spring pressure can be selected to be large enough to reliably guarantee the engagement of the gear on the worm shaft.

Embodiments are also conceivable in which the geared adjustment member is guided parallel to the axis of the worm shaft.

Very small manufacturing tolerances must then be adhered to.

An efficient, economical and noiseless arrangement without significant losses is stated in the characterizing parts of claims 2 to 4.

In this embodiment, the legs of the rocker arm cannot spring apart from each other under too heavy a load, which would impair the function of the braking mechanism.

In addition, the ends of the rocker arms are also held in position by guide grooves, so that contact between the legs and the worm shaft is avoided.

The present invention will be described in detail below with reference to the accompanying drawings.

The adjustable element in Figure 1 is the rearview mirror.
is numbered 10.

The output shaft 11 of the electric motor 12 drives a worm gear 13 to which a worm gear shaft 14 is twistably connected.

In addition, the worm gear 13 is rigidly connected to a further gear 15, which meshes with a further gear 16, which drives a second worm gear 17 together with a second worm gear shaft 18.

The gear 16 is a lever 19 actuated by an electromagnet 20.
installed on top.

The electric motor thus drives either only the worm gear shaft 14 or both said worm gear shaft 14 and said worm gear shaft 18.

The adjusting member, generally designated 30 in the embodiment of FIG. 1, is a rocker arm, which is mounted perpendicular to the axis of the worm gear shaft and is pivotable (within 31).

The swing arm has two levers 32 guided axially into each other. :! =33.

One lever 32 is designed as a fork with parallel legs 34 and 35.

A gear 36 is rotatably secured between the legs 34 and 35.

A turnip spring 37 supports one leg 35 and presses the gearwheel 36 on one front side thereof against the other leg 34, which serves as a friction area.

The hawk-shaped lever 32 is supported on another lever 33 via a compression spring 38.

The gear 36 is thus pressed resiliently against the worm gear shaft 14 or 18, respectively.

Said adjusting device operates as follows: when the worm gear shaft 14 or 18 rotates, the swinging arm 30 swings around the point of rotation 31, since the cup spring 37 causes the gear 36 to rotate on the leg 34 of the hawk. By pressing so hard against the friction area, this gear 36 is prevented from moving.

However, if the movable element impedes movement, for example hits a limiting stop, the gear 36 will rotate because the force blocking friction joint is unable to accept the increased torque.

Despite the movement of the adjustable element 30 being blocked, the worm gear shaft 14 or 18 can continue to rotate, so that a slightly increased current consumption of the electric motor can be observed.

On the other hand, the gear 36 can roll on the resting worm gear shaft 14 or 18 when a force is acting on the movable element 10 or the rocker arm 30.

It is very important that in the event of a failure of the electric motor 12, the adjustment device can be activated manually in this way, thereby allowing continuous adjustment by power during constant adjustment.

On the other hand, the electric motor is effectively protected against overload and also in the final position of the moving element, so that no additional limit switches are necessary.

In addition to being able to be electrically adjusted, the position of the movable element is thereby ensured for automatic locking of the gear element.

An essential element meeting these requirements is a force-clamping brake, which is formed by a spring element 37 associated with the frictional force between the front side of the gearwheel 36 and one leg 34.

This brake can prevent movement of gear 36 if motorized regulation is desired.

The brake, on the other hand, allows rotation of the gearwheel 36 when it is applied to the movable part 10 from the outside.

Finally, said spring element 37 has the additional purpose of holding the adjustable movable elements in their respective positions.

Movable element 10 is movably mounted within housing 40 via a knuckle joint shown at 41.

The adjustment power is transmitted to the element 10 by one lever 33 via a ball joint member 42 or 43.

Fig. 1 t is the result of the ball joint sound 42 being the axis of rotation
It is shown acting on element 10 above.

The other ball joint member 43 is however articulated laterally to the element 10 so that a straight line G connecting the two articulation points runs perpendicular to the X-axis or parallel to the Y-axis.

During actuation of the only adjusting element with the ball joint element 43, the element 10 is pivoted about the X axis.

However, if both adjustment members are actuated, the element 10 is pivoted about the Y axis.

In the second embodiment of FIG. 4 there are two worm shafts 14 or 1.
8 are independently driven via two electric motors 122 and 12b.

To save space, these drive units are arranged parallel to each other but staggered in the axial direction so that one electric motor is located laterally next to the adjustment member of the other electric motor.

Additionally, in this embodiment the power transmission device between the rocker arm 30 and the adjustable 'element 10 is of simple design.

The rearview mirror is glued onto a mounting 50 made of plastic material, of course requiring reinforcement with sheet metal.

A plastic ball 51 is formed on this mounting plate,
The ball is held in a force fit by a hawk portion 52 that is integrally connected to the rocker arm 30.

The balls are arranged in the mounting plate 50 in such a way that they are located on the two axes of rotation, since in this embodiment only one of the two axes is actuated in each case. It is.

Finally, I would like to point out a few additional design details.

In the embodiment according to FIG. 2, a safety web 60 is fixedly mounted to prevent gear 36 from unscrewing the worm shaft.

This safety web 60 extends parallel to the first worm gear shaft 14 .

As can be seen, the shaft 32 is movable within a slot contained within the lever 33.

Therefore, the spring 38 pushes the lever 32 and therefore the gear 36
Press to bring it into contact with the mandrel 14.

The web 60 prevents the lever 32 from returning such a distance that the gear no longer contacts the mandrel thread.

The web, which is an extension or protrusion, therefore prevents the arm 32 from retracting so that the gear no longer meshes with the worm gear.

The adjustment device is inserted as a preassembled unit into the mirror housing and is fixed by means of a cover 70 directly on the circumferential web 12 formed integrally on the housing (FIG. 2).

As shown in FIG. 2, several actuating elements, ie elements of the ball joint as well as supporting projections 13 for the bellows joint, are molded onto a mounting plate 50 made of plastic material.

FIG. 2 further shows that the clearance in the adjusting device can be suppressed via the spring element 14.

This spring element can be a leaf spring fixed to the mounting plate, which spring is laterally supported on a fixedly mounted support member.

In this way the flapping of the moving element, which is caused by the wake (5l
ip, stream) can be avoided.

In the third embodiment of FIGS. 5 to 10, two very high speed electric motors are used, so a corresponding speed reduction is necessary.

In this embodiment, the adjustment element 30 is designed as a one-piece rocker arm.

The shaft 80 of the gearwheel 36 is guided in an oblong hole 81 in the legs 34, 35, so that the gearwheel 36 and the spring element 37 can be adjusted in the longitudinal direction of the rocker arm.

This axial adjustability is important because the gear 36 is still in mesh with the worm shaft 14.18 during adjustment of the rocker arm.

As a result, during adjustment of the rocker arm, the axle 80 projecting from the leg is rolling along the guide web 60 of the gear wheel 36, which guide web is connected to the worm shaft 14, 1B.
extends parallel to.

The two legs 34, 35 are passing into the stud 82.

The studs 82 increase the stability of the rocker arm so that the legs 34,35 cannot spring apart.

In addition, it can be seen from FIG. 5 that the stud 82 is guided in a groove 83.

In this way, the deflection of the entire rocker arm is insect-proofed.

Adjustable element 10 in the embodiments of FIGS. 5 to 10
A ball 8 is rotatably mounted in ball cups 85 and 86.
4 is screwed on.

One ball cup 85 is formed integrally with the housing 81, and the other ball cup 84 is supported as a separate part by a plate spring 88 on a mounting plate 89.

The stud 90 of the second ball cup 86 then projects into the recess of the generally square leaf spring 88, which leaf spring is secured to the mounting plate by means of transverse projections and supported on the bottom of said mounting plate. There is.

Two arms 92 and 93 are integrally formed on a ball made of plastic, said arms forming an angle of 90° and thereby defining the adjustment axle of the element.

The middle height front side 94 of the two arms 92 and 93 is stud 8
2 into the longitudinal slot 95.

These longitudinal slots 95 are adjusted across the axis of rotation of the rocker arm or in the longitudinal direction of the rocker arm.

The width of the slots 95 corresponds to the width of the front sides of the heights of the arms 92, 93, so that they are guided at right angles to the longitudinal slots without any play.

9 and 10 show that arms 92, 93 are additionally guided in slots 96 of ball cup 85.

FIG. 10 shows the profile of these slots 96, the width of which initially decreases starting from the edge and corresponds to the diameter of the arm 92,93 in the central adjustment position, and then increases again.

In this way the clearance is reduced.

At the two extreme positions of the adjusting element the arm contacts one or the other side wall of the slot 96 respectively.

Two possible adjustment positions are shown in FIG. 10 in dotted lines.

The recess 98 is necessary so that the slotted ball cup can be removed from the mold without difficulty.

5 to 10 show that the entire adjustment device is located within a housing consisting of a mounting plate 89 and a housing cover 87. FIGS.

This unit can be easily inserted into the actual mirror housing (details not shown).

Compared to other examples, no special means for sealing are required.

It is essential that the damping spring 74 is fixed directly between the movable element 10 and the housing so that it can be inserted into mirror housings of different types without any modification.

In this connection, it is noted that due to the elastic insertion of the ball 84 between the ball cups 85, 86, a very good damping is already achieved so that the fluttering of the moving element is already significantly reduced. must be specially pointed out.

Therefore, in many cases it would be possible to do without additional braking elements.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the first embodiment of the invention, FIG. 2 is a sectional view through the rearview mirror, FIG. 3 is a perspective view of the adjustment device, FIG. 4 is a perspective view of the second embodiment, and FIG. 6 is a perspective view of the third embodiment, FIG. 6 is a diagram of the adjusting device of the embodiment of FIG. 5, FIGS. 1 to 9 are sectional views of the adjusting device of FIG. 6, and FIG.
FIG. 0 is a partial sectional view taken along line XX in FIG. 10...Movable element (rearview mirror), 12...
...Electric motor, 14...First worm shaft, 1
6... Gear, 18... Second worm shaft, 30... Adjustment member (rocker arm), 32
, 33...Luv, 34°35...Parallel leg, 36...Gear, 31...Sail spring, 40...Housing, 41 ...Knuckle joint, 52...Hawk part, 60...
... Safety web (guide web), 10 ... Cover, T4 ... Braking spring, 80 ... Axle, 81 ... Oval hole, 82 ...Stud, 83...Guiding groove, 84...Ball, 85...1st ball cup, 86...2nd ball cup , 81...Housing cover, 88
...Plate spring, 89 ...Mounting plate, 90
...Stud, 92, 93... Arm, 95, 96... Slot, 98... Recess.

Claims (1)

[Claims] 1. A device for adjusting a movably mounted rearview mirror, comprising a rotatably mounted worm gear shaft 14 and an adjustment member meshing with the worm gear shaft and connected to the rearview mirror. In , the adjustment member is adapted to be pivoted vertically about a pivot point 31 and has at its front end two extending legs 34 and 35 with a gear 36 mounted between them, which one rocker arm 30 in contact with said worm gear shaft and one spring 31 adapted to press against the front face of the gear in order to exert a braking force between the gear and one surface of said leg.
and by which the rocker arm 30 is pivoted about the pivot point 31 when the force of the spring 31 is large enough to prevent rotation of the gear 36 when the worm gear shaft 14 rotates. A device for adjusting rearview mirrors mounted on. 2. The gear 36 in the longitudinal direction of the rocker arm has an axis 80 located in an oblong hole 81 in the extending leg 34.35.
2. Device according to claim 1, characterized in that the spring element 31 and the spring element 31 are movably mounted. 3 The shaft 80 of the gear is connected to the leg 3 of the rocker arm guide web 60
3. A device according to claim 2, characterized in that it rolls along the outside of 4,35. 4 The two axes 34, 35 of the rocker arm on the side of the worm gear shaft 14 opposite the axis of rotation of the rocker arm
4. Device according to claim 3, characterized in that the stud ends in one stud, which stud sinks into the stationary guide groove 83 on the front side.