WO2008103120A1

WO2008103120A1 - Steering column for a vehicle

Info

Publication number: WO2008103120A1
Application number: PCT/SE2008/050180
Authority: WO
Inventors: Teddy Karlsson
Original assignee: Scania CV AB
Current assignee: Scania CV AB
Priority date: 2007-02-22
Filing date: 2008-02-15
Publication date: 2008-08-28
Anticipated expiration: 2009-08-22
Also published as: EP2121412B1; SE0700437L; EP2121412A4; SE530884C2; EP2121412A1

Abstract

Steering column (10) for a vehicle with a steering column housing supported for movement relative to a cab structure, a steering wheel shaft housing supported for tilting relative to the steering column housing, and a locking mechanism (40) for releasing and locking the movability and the tiltability of the steering column housing during setting of the steering column. The locking mechanism (40) has a first lever (50) provided with a first locking means (52) and supported in the steering column housing for pivoting between a locking position and a releasing position. In the locking position the first locking means (52) is in engagement with the cab structure to prevent movement of the steering column housing. In the releasing position the first locking means (52) is out of engagement with the cab structure in order to allow movement of the steering column housing. The locking mechanism (40) has also a second lever (60) provided with a second locking means (62) and likewise supported in the steering column housing for pivoting between a locking position and a releasing position. In the locking position the second locking means (62) is in engagement with the steering wheel shaft housing to prevent tilt movement of the steering wheel shaft housing. In the releasing position the second locking means (62) is out of engagement with the steering wheel shaft housing in order to allow tilt movement of the steering wheel shaft housing. In addition, the operating end of each of the first and second levers is connected to a common articulation (80) for pivoting the levers (50, 60) between the locking and releasing positions.

Description

Steering column for a vehicle

TECHNICAL FIELD

The invention relates to a steering column for a vehicle comprising a steering column housing supported for movement relative to a cab structure, a steering wheel shaft housing supported for tilting relative to the steering column housing, and a locking mechanism for releasing and locking the movability and the tiltability of the steering column housing during setting of the steering column.

BACKGROUND

A known such steering column according to EP 1431100 A2 is provided with separate actuators for setting and for locking and releasing both the longitudinal state and the tilt state. In the case of that steering column, the position of an instrument panel is also set at the same time. In the case of a known manually settable such steering column referred to in

US 5 363 716 the movability and the tiltability are locked and released separately by a single manual operating means which at an extreme position releases the movability, at an opposite extreme position releases the tiltability and at a normal intermediate position locks both the movability and the tiltability.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a simple and space-saving configuration which by a common adjusting mechanism can at the same time lock or release both the movability and the tiltability of the steering column. This is achieved by the features indicated in the claims set out below.

According to a version of the invention, the steering column comprises a first lever provided with a first locking means and supported in the steering column housing for pivoting between a locking position and a releasing position. In the locking position the first locking means is in engagement with the cab structure to prevent movement of the steering column housing. In the releasing position the first locking means is out of engagement with the cab structure in order to allow movement of the steering column housing. The locking mechanism has also a second lever provided with a second locking means and likewise supported in the steering column housing for pivoting between a locking position and a releasing position. In the locking position the second locking means is in engagement with the steering wheel shaft housing to prevent tilt movement of the steering wheel shaft housing. In the releasing position the second locking means is out of engagement with the steering wheel shaft housing in order to allow tilt movement of the steering wheel shaft housing. In addition, the operating end of each of the first and second levers is connected to a common articulation for pivoting the levers between the locking position and the releasing position. Such a jointly operable lever arrangement makes it possible for the steering column to be acted upon a single adjusting mechanism for totally simultaneous setting of both the longitudinal and the tilt positions of the steering column.

According to an embodiment of the invention, the adjusting mechanism is a pneumatic actuator. According to another embodiment, the common articulation is urged towards said locking position by a spring, thereby making it possible to use, for example, an uncomplicated single-acting pneumatic cylinder as actuator to the releasing position. The reversion of the locking mechanism from the released state to the locked state may be made self-acting if the pressure line to the pneumatic actuator is provided with a constricted outlet to atmosphere.

Other features and advantages of the invention are indicated by the claims and the following description of embodiment examples.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side view of an upper steering column according to the invention;

FIGS. 2 and 3 are schematic side views of a locking mechanism of the upper steering column in FIG. 1 in a locked state and a released state respectively.

DETAILED DESCRIPTION OF EMBODIMENT EXAMPLES

The schematic drawing in FIG. 1 depicts an upper steering column 10 with a steering column housing 12 which is connected in a longitudinally movable manner to a cab structure 90 for a vehicle via a longitudinal guide 20. The housing 12 also supports for tilting about a horizontal axis 18 a steering wheel shaft housing 32 for a steering wheel shaft 34 for a steering wheel 36. FIG. 1 also depicts a telescopic lower steering column 100 which has its upper end connected in a conventional manner to the steering wheel shaft 34 via an undepicted universal coupling and has its lower end connected to an undepicted steering gear.

The arrangement described above thus allows longitudinal and tilt movements of the upper steering column 10 in the direction indicated by the arrows in FIG. 1 with the object of setting the steering wheel 36 in a desired position for a driver of the vehicle.

The upper steering column 10 also has a locking mechanism 40 for locking and releasing the longitudinal and tilt movements of the upper steering column 10.

In the embodiment depicted in FIGS. 2 and 3, the locking mechanism 40 comprises a pair of handles or levers 50, 60 each supported in the steering column housing 12 for pivoting at their respective articulations 14 and 16.

A first lever 50 of the levers 50, 60 supports a first locking means 52 adapted to being put into/out of engagement with a stationary element 22 of the longitudinal guide 20 which may form part of the cab structure 90. The stationary element 22 may be firmly connected to the cab structure 90 by a fastening element 23 such as a bent steel plate. A movable portion 24 of the longitudinal guide 20 is firmly connected to the steering column housing 12 in a manner not depicted in detail.

A second lever 60 of the levers 50, 60 supports a second locking means 62 adapted to being put into/out of engagement with a rotatable portion 30 of the tiltable steering wheel shaft housing 32. In the example depicted, the rotatable portion 30 is a circular disc or a tilt wheel fastened firmly to the steering wheel shaft housing 32. For reasons of symmetry, a disc may be provided on each side of steering wheel shaft housing 32 (not depicted), in which case the handle 60 may of course be provided with two locking means 62. In corresponding undepicted manner, the handle 50 may also be provided with two locking means 52. The locking means 52, 62 may be configured in various undepicted ways.

They may for example be made of rubber material in order to lock by frictional surface engagement. They may also take the form of keys/keyways for locking engagement with keyways/keys. They may also take the form of eccentrics supported for pivoting at respective articulations 14, 16 for locking by eccentric action.

As may also be seen in FIGS. 2 and 3, each of the levers 50, 60 has an operating end which is linked to that of the other by an articulation 80 which is acted upon by an adjusting mechanism 70. Although the adjusting mechanism may be operable manually, it comprises in the example depicted an actuator 70. Although the actuator 70 may for example be of an electrical or hydraulic type, it is in the example depicted a pneumatic actuator comprising a pneumatic cylinder 72 with a piston 76 and a piston rod or operating rod 78. The cylinder 72 is firmly connected, in a manner not depicted in detail, to the steering column housing 12. The outer end of the piston rod 78 is connected to the articulation 80.

In the locked normal state according to FIG. 2, the two levers 50, 60 of the adjusting mechanism 40 are urged towards their locking positions by a compression spring 74 in the cylinder 72. The compression spring 74 pushes the piston 76 to an extreme position at which the piston rod 78 is extended and, via the common articulation 80, maintains the levers 50, 60 in their locking positions. The two housings 12, 32 (FIG. 1) will thus be locked in their previously set positions.

In the released setting state according to FIG. 3, the two levers 50, 60 of the adjusting mechanism 40 are urged towards their releasing positions as a result of the pneumatic cylinder 72 being pressurised via a compressed airline 100. The pressure from the line 100 pushes the piston to an extreme position at which the piston rod 78 is drawn back and, via the common articulation, maintains the levers 50, 60 in their releasing positions. The two housings 12, 32 (FIG. 1) will thus be released for setting of their longitudinal and tilt positions respectively. The actuator 70 is with advantage provided, in an undepicted manner, with delayed automatic reversion to the normal locked state in FIG. 2. If the actuator is the pneumatic actuator 70 depicted, this may be achieved by a constriction 102 (FIG. 3) in an outlet to atmosphere of the line 100. The constriction 102 will allow the pressure to decrease progressively in the cylinder 72 so that the piston 76, urged by the spring 74, reverts to the locked state according to FIG. 2 after sufficient time, e.g. a few seconds, to allow the driver of the vehicle to set the upper steering column to a desired new longitudinal and tilt position. The description set out above is primarily intended to facilitate comprehension and no limitations of the invention are to be inferred therefrom. The modifications which will be obvious to one skilled in the art from perusing the description may be implemented without departing from the concept of the invention or the scope of the claims set out below.

Claims

1. A steering column (10) for a vehicle comprising a steering column housing (12) supported for movement relative to a cab structure (90); a steering wheel shaft housing (32) supported for tilting relative to the steering column housing (12); and a locking mechanism (40) for releasing and locking the movability of the steering column housing (12) and the tiltability of the steering wheel shaft housing (32) during setting of the steering column (10); characterised in that the locking mechanism (40) comprises a first lever (50) provided with a first locking means (52) and supported in the steering column housing (12) for pivoting between a locking position in which the first locking means (52) is in engagement with the cab structure (90) to prevent movement of the steering column housing (12) and a releasing position in which the first locking means is out of engagement with the cab structure (90) in order to allow movement of the steering column housing (12), a second lever (60) provided with a second locking means (62) and supported in the steering column housing (12) for pivoting between a locking position in which the second locking means (62) is in engagement with the steering wheel shaft housing (32) to prevent tilt movement of the steering wheel shaft housing (32) and a releasing position in which the second locking means is out of engagement with the steering wheel shaft housing (32) in order to allow tilt movement of the steering wheel shaft housing (32), with an operating end of each of the first and second levers (50, 60) connected at a common articulation (80) for pivoting of the levers between the locking and releasing positions.

2. A steering column according to claim 1, in which the common articulation (80) is connected to an adjusting mechanism (70).

3. A steering column according to claim 1 or 2, in which the adjusting mechanism comprises a pneumatic actuator (70).

4. A steering column according to any one of the foregoing claims, in which the common articulation (80) is urged towards said locking positions by a spring (74).

5. A steering column according to claim 4, in which the pneumatic actuator (70) comprises an outlet with a constriction (102) to atmosphere for effecting delayed self- acting reversion of the actuator (70) from the released state to the locked state.

6. A steering column according to any one of the foregoing claims, in which the first locking means (52) engages with the cab structure (90) via a fixed portion (22; 23) of a longitudinal guide (20).

7. A steering column according to any one of the foregoing claims, in which the second locking means (62) engages with the steering wheel shaft housing (32) via a disc (30) which is rotatable together with tilt movements of the steering wheel shaft housing.