WO2014184051A1

WO2014184051A1 - Steering gearing having hydraulic assistance by means of a vane

Info

Publication number: WO2014184051A1
Application number: PCT/EP2014/059189
Authority: WO
Inventors: Markus Rief; Martin Maier; Werner Bernhard
Original assignee: Zf Lenksysteme Gmbh
Priority date: 2013-05-16
Filing date: 2014-05-06
Publication date: 2014-11-20
Also published as: DE102013105021A1

Abstract

The invention relates to a steering gearing for a steering system of a vehicle, comprising: an output shaft (11) for transferring torque from an input shaft (26) to a steering linkage of the steering system and a first vane (10) for steering force assistance, wherein the first vane (10) can be rotated in a piston space (15) and separates a first piston chamber (8) from a second piston chamber (9) of the piston space (15) and is rigidly connected to the output shaft (11).

Description

Steering gearbox with hydraulic assistance by means of a wing

DESCRIPTION

FIELD OF THE INVENTION

The present invention relates to steering gears for steering systems of vehicles and steering systems for vehicles.

BACKGROUND OF THE INVENTION

In the prior art steering gear are known, which allow a hydraulic support of the steering operation.

SUMMARY OF THE INVENTION

Hydraulic steering supports are constructed, for example, as ball-nut hydraulic steering systems. These power steering converts the rotational movement of the steering shaft in a linear motion that can be hydraulically amplified. The resulting increased linear motion is again in a

Rotational movement of a segment shaft converted whose torque is passed to the steering column lever. Such multiple

Movement direction transformations require a high number of components and result in a low resulting efficiency of the respective

Steering assistance. An object is therefore to provide a steering gear for a power steering / steering assistance available, which has a simple structural design with few components and realized high efficiency. As a first embodiment of the invention, a steering gear is provided for a steering system of a vehicle, comprising: an output shaft for

Torque transmission from an input shaft to the steering linkage of the

Steering system and a first wing for Lenkraftunter support, wherein the first wing is rotatable in a piston chamber and a first piston chamber separated from a second piston chamber of the piston chamber and is fixedly connected to the output shaft.

The input shaft can in particular for torque transmission from

Steering wheel / steering wheel be provided to the output shaft. It can be realized a mechanical drive. In an alternative embodiment, there is no rigid / solid mechanical connection between the input shaft and the output shaft (steer-by-wire) and therefore also no mechanical drive-through.

By fiction, contemporary rotary rather than translational

Power steering / power steering can open

Movement direction transformations are omitted. Advantageously, this can provide a steering gear with a small number of components. In addition, by the fiction, contemporary design a high

Efficiency ensured.

As a second embodiment of the invention, a steering gear for a

A steering system of a vehicle provided, comprising: a piston space for transmitting torque from an input shaft to the steering linkage of the steering system and a first wing, wherein the piston space is rotatable about the first wing, and wherein the first wing separates a first piston chamber from a second piston chamber of the piston chamber , In one embodiment, the input shaft drives not an output shaft, but a piston chamber which is rotatable about an axis. Within the piston chamber, a wing is fixed, which remains with respect to the movement of the piston chamber at rest. This wing divides the piston chamber into two piston chambers. The piston chambers can be filled with fluid.

As a third embodiment of the invention, there is provided a steering system of a vehicle comprising a steering gear according to any one of claims 1 to 9. Exemplary embodiments are described in the dependent claims.

According to an exemplary embodiment of the invention, a steering gear is provided, the steering gear comprising: a machine element connected to the output shaft and drivable by the input shaft.

In a further embodiment according to the invention a steering gear is provided, wherein the steering gear comprises: a machine element, which is connected to the input shaft, and for transmitting torque to the

Piston space is provided.

According to an exemplary embodiment of the invention, a steering gear is provided, wherein the machine element for the reduction or

Translation is provided and designed as a worm gear, as a planetary gear, as a spur gear, as bevel gear or as other single or multi-stage transmission.

Due to the design of the machine element as a worm gear, as

Planetary gear, as a helical gear, bevel gear or other single or multi-stage gearbox, a reduction between input shaft and output shaft or in an alternative embodiment between input shaft and piston chamber can be realized. In a further embodiment according to the invention, a steering gear is provided, wherein the machine element as a segment with a

Worm wheel and an intermeshing worm is formed.

Is the machine element as a segment with in particular a

Schneckenradabschnitt and thus meshing worm / pinion formed, a compact design of the reduction and thus the steering gear can be achieved. The worm / pinion may be integrally formed with the steering shaft or be rigidly connected to the steering shaft or other machine elements.

In a particularly advantageous embodiment, the first wing and the segment are formed in one piece / one piece, whereby the number of necessary components can be reduced. Due to the one-piece / one-piece design, in particular the assembly of the steering gear according to the invention can be simplified. The first wing and the segment may be aligned perpendicular to each other.

According to a further embodiment of the present invention, a steering gear is provided, wherein between the first wing and the machine element, a separation, in particular as a wall, is arranged.

By a partition which may be formed as a wall, a

"Hydraulic" area, in which fluids are used for pressure and force generation, are separated from an electrical, an electronic or a purely mechanical area.

According to an exemplary embodiment of the invention, a steering gear is provided, wherein the first and / or the second piston chamber have a first and / or a second passage, whereby fluid from the first and / or the second piston chamber in a respective opposite

Piston chamber can get. Through the training "supporting" point mirror image arranged

Piston chambers and a passage for fluids for in the same

Direction of rotation acting piston chambers, the power steering can be increased. As a result, an existing space is optimally

Power steering used.

In a further embodiment according to the invention a steering gear is provided, wherein the first and / or the second passage as

Through hole is formed by the output shaft.

By forming the passages as through holes through the

Shaft / axle / output shaft can be realized in a very simple manner to fill fluids in piston chambers, which act in a same direction of rotation. As an idea of the invention can be considered a steering gear with

To provide steering assistance that without

Movement direction conversions gets along. In particular, should on the

Conversion of a rotary rotary motion in a linear motion to increase them hydraulically, and again a conversion into a rotary

Rotary movement can be dispensed with. Inventions according to the rotary rotary motion of the steering shaft is directly supported / reinforced hydraulically.

Of course, the individual features can also be combined with each other, which can also be partially beneficial effects that go beyond the sum of the individual effects.

BRIEF DESCRIPTION OF THE DRAWINGS

Further details and advantages of the invention will be apparent from the in the

Drawings illustrated embodiments clearly. Show it

1 shows a steering assistance of the prior art, 2 is a front view of the steering gear with the piston chamber and a movable wing, Fig. 3 is a side view of the steering gear,

4 is a representation of a segment with toothing as Schneckenradabschnitt,

5 is a perspective view of a steering gear according to the invention,

Fig. 6 is another perspective view of the invention

Steering gear,

7 is a sectional view of a front portion of the steering gear,

8 is a cross-sectional view of a first alternative of a steering gear with a movable wing,

9 is a longitudinal sectional view of the first alternative,

10 is a cross-sectional view of a second alternative of a steering gear with a rigid wing,

Fig. 11 is a longitudinal sectional view of the second alternative.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

Fig. 1 shows a steering gear with hydraulic steering assistance of the prior art as a ball-nut power steering. The rotational movement 2, 3 of the steering shaft 4 is converted into a linear movement 5. This linear movement 5 can be hydraulically amplified and by a toothing in a rotational movement. 7 the segment wave 6 are transformed. This results in a

Steering gear of the prior art two movement direction transformations (from 2.3 to 5 and from 5 to 7). Fig. 2 shows a front view of a wing 10, which is arranged within a piston chamber 15. The vane 10 may rotate / rotate about the output shaft 11 within the piston chamber 15. By filling a fluid, for example a hydraulic fluid, into the piston chamber 8 and / or 9, the blade 10 can be moved. This can be a hydraulic

Steering support can be achieved. Fixed / rigidly connected to the output shaft 11 is a segment 12, which is formed in an upper region 14 as a worm wheel. With the teeth of the area 14 meshes a worm / pinion 13. The worm 13 is rigid due to today's regulations with a

Steering wheel / steering wheel of a corresponding vehicle connected (mechanical drive) and can represent a portion of the steering shaft. By a rotation of the steering wheel, therefore, the worm 13 is also set in a rotational movement. The worm 13 meshes with the teeth of the Schneckenradabschnitts 14, whereby the output shaft 11 is set in a rotational movement. This rotational movement can be directly amplified by the wing 10 by filling the piston chambers 8, 9, whereby a steering power assistance can result. Movement direction transformations to allow power steering may therefore be eliminated. In an alternative embodiment according to the invention there is no mechanical connection between the output shaft and the input shaft, in particular no rigid mechanical connection. In this alternative embodiment, therefore, there is no mechanical drive-through.

Fig. 3 shows a side view of the fiction, contemporary steering gear with a worm 13, which can be firmly connected to a steering wheel / steering wheel. By the rotational movement / rotation of the worm 13, a segment 12, which is formed in a region 14 as a worm wheel, driven. Due to the rotational movement of the segment 12, the output shaft 11 fixedly connected to the segment 12 is driven, its torque being applied to a steering column lever of a steering system can be forwarded. The rotational movement of the output shaft 11 can be enhanced by the arrangement of a piston chamber 15. For this purpose, a wing 10 can be arranged within the piston chamber 15, which divides the piston chamber 15 into a left / first piston chamber 8 and a right / second piston chamber 9. In the left and / or right piston chamber 8, 9, a fluid, such as a hydraulic fluid, are filled, resulting in a force on the wing 10. It turns by a steering force support the rotational movement of the output shaft 11 a. The steering gear may have a partition wall 16 having a right (with respect to the plane of the drawing) mechanical area for

Reduction with the worm gear from a left (relative to the

Drawing plane) area separates. In particular, this ensures that no hydraulic fluid enters the right area.

Fig. 4 shows the segment 12, which has a section 14 with teeth, which is designed as Schneckenradabschnitt. The teeth of the section 14 mesh with a worm 13, which may be rigidly / firmly connected to the steering shaft and thus the steering wheel.

Fig. 5 shows a perspective view of a steering gear according to the invention with a wing 10, the two piston chambers 8, 9 separated from each other. A fluid can be introduced into the piston chambers 8, 9 to move the blade 10 and thereby generate hydraulic steering assistance by applying a torque to the output shaft 11. On the output shaft 11 can

Through holes 17 are arranged, whereby, for example, a fluid from the piston chamber 9 can pass into a mirror-image arranged piston chamber 22 and thereby a torque on the output shaft 11 by a

Exercise force on another wing 19 can exercise.

Fig. 6 shows a further perspective view of a fiction, contemporary steering gear with a mechanical reduction by the worm gear with worm 13 and segment 12. The resulting rotational movement of the

Output shaft 11 can be reinforced by a force on the wing 10, which results in a steering power assistance. Through through holes 17, fluid can pass into opposing, for example, smaller piston chambers 18 in order to amplify the torque to the output shaft 11. Fig. 7 shows a sectional view of a front portion of the steering gear with the wings 10, 19, which are connected to the output shaft 11 rigid / one-piece / one-piece. Through through holes 17, 23 fluid flows 24, 25 flow between each acting in the same direction of rotation piston chambers, whereby the available space is optimally utilized for power steering assistance.

Fig. 8 shows a first alternative of a fiction, contemporary steering gear with a rotatable wing 10, wherein the wing 10 is formed integrally with an output shaft 11. The wing 10 divides the piston chamber 15 into two piston chambers 8, 9.

Fig. 9 shows a longitudinal sectional view of the first alternative of

Steering gear according to the invention with the output shaft 11 on which the first wing 10 is arranged. To the output shaft 11 also a boom / a segment 12 is connected, on which a Schneckenradabschnitt 14 may be formed. Of the

Worm wheel portion 14 meshes with a worm 13. The gearbox with worm 13 and worm wheel portion 14 serves to reduce a torque of a steering shaft (not shown). As a result, the output shaft 11 is driven. To increase the torque can be filled in the piston chambers 8, 9 fluids, resulting in a steering assistance.

Fig. 10 shows a second alternative of a steering gear according to the invention with a fixed wing 10 and a rotatable piston chamber 15. Der

Piston chamber 15 is connected to the output shaft 11. Fig. 11 shows the second alternative of the steering gear according to the invention with the output shaft 11 to which the piston chamber 15 is fixed. On the piston chamber 15, a segment / boom 12 is arranged with a Schneckenradabschnitt, the with a snail 13 combs. As a result, the screw 13, the cylinder chamber 15 and thereby drive the output shaft 11. The rotational movement of the

Cylinder space and the output shaft 11 can be supported by filling the piston chambers 8, 9. The segment 12 can be made smaller in comparison to the first alternative (FIGS. 8, 9), which results in an advantage in terms of space requirements.

In an alternative embodiment, instead of a worm gear, a planetary gear, a spur gear, a bevel gear or other single or multi-stage gear, in particular for reduction, are used.

Due to the direct, for example, hydraulic, amplification of the rotational movement of the output shaft 11 can be dispensed with a conversion of the direction of movement (rotational movement in a translational movement and vice versa).

As a result, otherwise necessary components can be saved.

By forming the segment 12 with a worm wheel portion 14 instead of a complete worm wheel, the steering gear can be made compact. In addition, advantageously results by the radially outwardly offset arrangement of the Schneckenradabschnitts 14, a corresponding lever arm.

The fiction, contemporary steering gear is characterized by any scalability, as by any possible magnification of the wing 10 and the

Piston chambers 8, 9 a correspondingly large steering assistance can be achieved.

It should be noted that the term "comprise" further elements or

Does not preclude procedural steps, just as the term "a" and "an" does not preclude several elements and steps. The reference numerals used are for convenience of reference only and are not to be considered as limiting, the scope of the invention being indicated by the claims.

LIST OF REFERENCE SIGNS

1 ball nut

2 direction of rotation

3 direction of rotation of the steering spindle

4 steering spindle

5 movement direction

6 segment shaft

7 direction of rotation

8 left piston chamber

9 right piston chamber

10 wings

11 output shaft

12 segment / boom

13 pinions / worm

14 worm wheel section

15 piston space

16 partition

17 hole

18 piston chamber

19 wings

20 piston chamber wall

21 piston chamber wall

22 piston chamber

23 hole

24 fluid flow

25 fluid flow

26 input shaft

27 center line

28 midline

Claims

A steering gear for a steering system of a vehicle, comprising:

an output shaft (11) for transmitting torque from an input shaft

(26) to the steering linkage of the steering system and

a first wing (10) for assisting steering power, wherein the first wing (10) is rotatable in a piston chamber (15) and a first piston chamber (8) from a second piston chamber (9) of the piston chamber (15) and separated with the output shaft (11 ) is firmly connected.

2. Steering gear according to claim 1, characterized in that the steering gear comprises:

a machine element connected to the output shaft (11) and drivable by the input shaft (26).

3. Steering gear for a steering system of a vehicle comprising:

a piston chamber (15) for transmitting torque from an input shaft (26) to the steering linkage of the steering system and

a first wing (10), wherein the piston space (15) is rotatable about the first wing (10), and wherein the first wing (10) separates a first piston chamber (8) from a second piston chamber (9) of the piston space (15) ,

4. Steering gear according to claim 3, characterized in that the steering gear comprises:

a machine element, which is connected to the input shaft (26), and is provided for transmitting torque to the piston chamber (15).

5. Steering gear according to one of claims 2 or 4, characterized in that the machine element is provided for reduction or translation and as

Worm gear, is designed as a planetary gear, as a spur gear, as bevel gear or as other single or multi-stage gearbox.

6. Steering gear according to one of claims 2, 4 or 5, characterized in that the machine element as a segment (12) with a Schneckenradabschnitt (14) and a worm meshing therewith (13) is formed.

7. Steering gear according to one of claims 2, 4, 5 or 6, characterized in that between the first wing (10) and the machine element, a partition (16), in particular as a wall, is arranged.

8. Steering gear according to one of the preceding claims, characterized in that the first and / or the second piston chamber (8, 9) have a first and / or a second passage (17, 23), whereby fluid from the first and / or second piston chamber (8, 9) in a respective opposite piston chamber (18, 22) can pass.

9. Steering gear according to claim 8, characterized in that the first and / or the second passage (17, 23) is formed as a through hole through the output shaft (11).

10. steering system of a vehicle comprising a steering gear according to one of the preceding claims.