DE102017125605A1 - Chassis with friction brake device and vehicle with the chassis - Google Patents

Abstract

The chassis forms the basis of a vehicle and is thus largely responsible for the driving characteristics of the vehicle. The landing gear comprises a vehicle frame with wheel suspensions with wheels, wherein the wheel suspensions allow a relative movement in the vertical direction and rotational and steering movements of the wheels relative to the vehicle chassis. While in the prior art, the properties of the chassis were exclusively mechanical, a variety of properties of the chassis are now electronically controlled and adapted to the particular lane situations or driving situations.
A chassis (18) for a vehicle (1) is proposed, comprising a vehicle chassis (8) with a steered axle (2), wherein on the steered axle (2) a first and a second steered wheel (4a, b) are arranged, with a friction brake means (17) for braking the steered wheels (4a, b), wherein the friction brake means (17) on the vehicle chassis (8) is arranged.

Description

The invention relates to a chassis for a vehicle having the features of the preamble of claim 1. The invention further relates to a vehicle with this chassis.

The chassis forms the basis of a vehicle and is thus largely responsible for the driving characteristics of the vehicle. The chassis comprises a vehicle frame, with wheel suspensions with wheels, wherein the wheel suspension allow a relative movement in the vertical direction and possibly rotational and steering movements of the wheels relative to the vehicle frame. While in the prior art, the properties of the chassis were exclusively mechanical, a variety of properties of the chassis are now electronically controlled and adapted to the particular lane situations or driving situations.

The publication DE 10 2004 034 126 A1 , which is believed to be the closest prior art, discloses a motorized steerable road vehicle with a steer-by-wire system. As an actuator for an emergency driving program brakes of the vehicle can be electronically controlled to generate a steering movement of the vehicle according to the steering position of the steering element and to decelerate the vehicle to a stop.

It is an object of the present invention to propose a chassis and a vehicle with the chassis, which is characterized by an improved / modified functionality when braking. This object is achieved by a chassis with the feature of claim 1 and by a vehicle having the features of claim 10. Preferred or advantageous embodiments of the invention will become apparent from the dependent claims, the following description and the accompanying drawings.

The invention thus relates to a chassis which is designed for a vehicle. The vehicle is in particular a car, truck or bus. It is also possible that this is an electric vehicle, in particular a micro-vehicle with a total mass less than 200 kg. In particular, these may be vehicles with steer-by-wire steering.

The chassis has a vehicle chassis, which can also be referred to as a chassis, frame, undercarriage, etc.

The chassis has a steered axle, wherein on the steered axle a first and a steered second wheel are arranged. The steered wheels can also be designed in each case as double wheels. In particular, a left and a right steered wheel are arranged on the steered axle.

The landing gear includes a friction brake device for braking the steered wheels of the steered axle. The friction brake device can also be referred to as a friction brake device.

In the context of the invention, it is proposed that the friction brake device is arranged on the vehicle chassis. Thus, the steered wheels of the steered axle can move relative to the vehicle chassis and the friction brake device coupled to the vehicle chassis, in particular in the vertical direction and / or for rotational and / or steering movements. Due to the position, the friction brake device can be referred to as an internal brake.

The invention is based on the consideration that other properties and thus new functionalities of the undercarriage during braking are made possible by the offset of the friction brake device from the wheel suspensions and / or the wheel carrier to the vehicle chassis and / or by the support of the friction brake device on the vehicle chassis.

In a preferred development of the invention, the chassis and / or the vehicle has a control module for controlling the friction brake device. The control module can be embodied as a hardware module, in particular as a digital data processing device, for example as a microcontroller or the like. Alternatively, the control module is implemented as a software module that runs in its own control or in a vehicle control. The control module is designed to control the friction brake device, so that the two steered wheels are subjected to different braking torques. In principle, it is possible to apply only one steered wheel with a braking torque and leave the other steered wheel unrestrained.

In a preferred embodiment of the invention, the control module is programmatically and / or circuitry designed to implement a power steering and / or a steering of the vehicle. Optionally, the chassis has a sensor device for receiving a steering wheel angle and / or steering torque, so that based on the steering wheel angle and / or steering torque, the friction brake is controlled to realize the power steering and / or the steering of the vehicle.

By a suitable structural design of the chassis and a suitable control, in particular control concept, it is possible to realize by means of wheel-selective braking interventions on the steered axle steering power assistance or steering. However, the torque acting on the steering system depends on the type of brake. Relative to the realization of a steering power assistance, conventional brakes (external brakes) offer a lower potential than internal brakes. One idea of the invention is, in particular, the use of the Störkrafthebelarms instead of Lenklershalbmessers by the inner position of the brake to generate greater power steering or steering in the steering torque generation by braking interventions. For wheel-selective brakes, the type of support for the torque in the vehicle must be taken into account. For internal brakes the Störkrafthebelarm due to the braking forces for the steering torque is decisive. The support of the torque takes place here on the vehicle chassis. By contrast, in conventional, external brakes of the steering wheel radius or defined by this Bremskrafthebelarm the decisive factor, since here is the torque support on the suspension.

Brake forces external brakes generate about the Bremskrafthebelarm a torque about the steering axis, which can be used in the sense of a steering power assistance. Due to chassis requirements defined by the steering wheel radius lever arm is subject to certain limitations and should not be designed arbitrarily large. External brakes therefore have a low potential for steering torque formation. On the other hand, the Störkrafthebelarm in conventional chassis i.d.R. and / or designed in a preferred embodiment of the invention larger than the steering wheel radius, whereby a higher potential for steering power assistance is given by means of wheel-selective brakes. However, this only works due to the different torque support of the brakes with internal brakes. Thought of the invention is the use of Störersonhebelarms by internal brakes. This increases its potential for use as steering assistance or steering, so that they can be used for effective driver assistance during steering. This can facilitate vehicle guidance, increase ride comfort and improve the steering feel. Thus, a conventional steering assist during driving can be replaced or supported. The invention generates a way to better use friction brakes for driver assistance during steering.

In a preferred development of the invention, the friction brake device has a first friction brake and a second friction brake, the first friction brake serving to brake the first steered wheel and the second friction brake to brake the steered second wheel. In a preferred embodiment, the friction brakes are each realized as a disc brake, wherein the brake disc rotatably coupled to the respective wheel and / or is rotationally coupled and the caliper is arranged on the vehicle chassis.

In a preferred embodiment of the invention, the chassis on a first and a second suspension, wherein the suspension each form a coupling between the vehicle chassis and the driven wheel. Particularly preferably, the suspension is designed in each case as a double wishbone suspension. In this embodiment, it is particularly preferred that the suspension has in each case an upper and a lower wishbone. Alternatively, the suspension is designed as a multi-link suspension or as a McPherson suspension. It is particularly preferred that the Störkrafthebelarm is designed to be larger than the steering wheel radius.

In a preferred development of the invention, the chassis has a first and a second propeller shaft, wherein the propeller shafts transmit the braking torque from the friction brake device to the steered wheels. The propeller shafts are arranged between the friction brake device and / or the friction brakes and the respective steered wheel so that at least one joint of the propeller shaft lies in the torque path of the braking torque between the friction brake device and / or the friction brakes and the respective steered wheel.

Another object of the invention relates to a vehicle with the chassis as described above.

• 1 ein schematisches Blockdiagramm eines Fahrzeugs als ein Ausführungsbeispiel der Erfindung;
• 2 einen Ausschnitt eines Fahrwerks mit einer außenliegenden Bremse, welches den Stand der Technik reflektiert;
• 3 ein Ausschnitt eines Fahrwerks mit einer innenliegenden Bremse, welches ein Ausführungsbeispiel der Erfindung bildet; .
• 4 ein schematisches Blockdiagramm eines Fahrzeugs als ein weiteres Ausführungsbeispiel der Erfindung

Further features, advantages and effects of the invention will become apparent from the following description of preferred embodiments of the invention and the accompanying figures. These show:

• 1 a schematic block diagram of a vehicle as an embodiment of the invention;
• 2 a section of a chassis with an external brake, which reflects the prior art;
• 3 a section of a chassis with an internal brake, which forms an embodiment of the invention; ,
• 4 a schematic block diagram of a vehicle as a further embodiment of the invention

1 shows in a schematic plan view from above a vehicle 1 as an embodiment of the invention. The vehicle 1 has a steered axle 2 as well as another axis 3 on, with the steered axle 2 is formed in this embodiment as a driven axle. The steered axle 2 has steered wheels 4 a . b on which a steering 5 can be steered, so that a steering angle at the steered wheels 4a . b changes.

The drive torque of the steered axle 2 is about a drive 12 provided, which is designed as an internal combustion engine or electric motor. The drive torque of the drive 12 is via a torque transmission device 13 to the steered wheels 4a . b transfer. These are two cardan shafts 14 a . b provided in the moment path M each via an inner joint 15 a . b and an outer joint 16 a . b are integrated. The wheels 4a . b are about suspension 7a . b with a vehicle chassis 8th coupled, so the wheels 4a . b a relative movement in the vertical direction and / or a rotational and steering movement relative to the vehicle chassis 8th can implement.

The vehicle 1 has a friction brake device 17 on which two friction brakes 6a . b includes, wherein the friction brakes 6a . b inside, ie in the moment path M between the drive 12 and the propeller shafts 14 a . b are arranged. The moment path M forms in this embodiment, the transmission path for the drive torque and the braking torque. In particular, in each case a shaft section 25a , b provided, over the inner joints 15 a . b with the respective PTO shaft 14 a . b is operatively connected, the friction brakes 6a , b on the shaft sections 25a , b act. Further, the vehicle points 1 a control module 11 for controlling the friction brake device 17 , in particular the friction brakes 6 a . b , on.

The vehicle 1 also has a steering wheel 9 on which can be operated by a driver to a steering angle for the steering 5 pretend. For detecting the predetermined steering angle and / or steering wheel angle and / or steering torque is a sensor device 10 intended. The sensor device 10 is data technology with the control module 11 connected.

Through the sensor device 10 For example, the predetermined steering angle and / or the steering wheel angle and / or the steering torque can be recorded and sent to the control module 11 to get redirected. The control module 11 is programmatically and / or circuit technology, the friction brake device 17 , in particular the friction brakes 6a . b such that, based on the predetermined steering angle and / or steering wheel angle and / or steering torque, a steering force assistance and / or a steering is implemented by different braking torques on the friction brakes 6a . b will be realized.

For effective steering or power assisted by the friction brake 17 is the position of the friction brakes 6a . b an essential factor.

In the 2 is a conventional chassis 18 shown in detail from the prior art. It can be seen that the suspension 7a is designed as a double wishbone suspension and an upper wishbone 19 and a lower wishbone 20 having. The upper and lower wishbones 19 . 20 together define a steering axle 21 , The connection between the upper and lower control arms 19,20 is by a wheel 22 educated.

The friction brake 6a is between the wheel carrier 22 and the wheel 4a arranged. She has a brake disc 23 which is on a shaft of the torque transmitting device 13 or a stub axle is arranged rotationally fixed. Furthermore, the friction brake 6a a caliper 24 on, which on the wheel carrier 22 is arranged. It is thus an external brake. With an external brake, like these in the 2 is shown, is the steering wheel radius r0 or the Bremskrafthebelarm defined by this r_BR the decisive factor for the steering torque during braking, as here the torque support on the suspension 7a he follows. Brake forces of outboard brakes generate via the brake lever arm r_BR a torque around the steering axle 21 , which can be used in the sense of power steering or steering. Due to chassis requirements defined by the steering wheel radius lever arm is subject to certain limitations and should not be designed arbitrarily large. External brakes therefore have a low potential for steering torque formation.

In the 3 on the other hand is a section of a chassis 18 as an embodiment of the invention. Also the suspension 18 in the 3 has the suspension 7a on which the upper and the lower wishbone 19 . 20 as well as the wheel carrier 22 includes. The chassis 18 points - in the same way as in the 1 and 4 - the propeller shaft 14 a on which over the two joints 15 a . 16 a is arranged articulated. The significant difference, however, is that the suspension 18 in the 3 no external brake, but an internal brake is used. The friction brake 6a is in relation to the moment path M in front of the PTO shaft 14 a arranged. The brake disc 23 sits on the shaft section 25 a the torque transmitting device 13 and / or which is undriven and with the PTO shaft 14a over the inner joint 15a gearbox technology is coupled. The caliper 24 is on the other hand, on the vehicle chassis 8th arranged. When changing the vertical position of the wheel 4a thus becomes the friction brake 6a not carried in the vertical direction or according to the steering angle or angle of rotation, but remains stationary to the vehicle chassis 8th , In particular, the friction brake 6a in the moment path M in front of the PTO shaft 14 a arranged.

For internal brakes, like these in the 3 is shown, is the Störkrafthebelarm r_AN , ie the distance between the center of the wheel and the steering axle 21 , due to the braking forces for steering torque formation prevail. The support of the torque takes place here on the vehicle chassis 8th , In an exemplary embodiment, the disturbance force lever arm is r_AN designed larger than the steering wheel radius, whereby a higher potential for a steering power assistance or steering by means of wheel-selective brakes is given.

The 4 shows a further embodiment, wherein the steered axle as a passive and / or non-driven axle 2 is trained. In contrast, the other axis 3 as a driven axle with the drive 12 educated. At the steered axle is in the same structure as in the 1 the steering 5 , the friction brake device 17 with the friction brakes 6a , b arranged over the control module 11 is or will be controlled. The friction brakes 6a , b are over the shaft sections 25 a . b and then over the drive shafts 14a , b with the steered wheels 4a, b operatively connected, so that these steered wheels 4a , b independent of the friction brakes 6a, b can change a steering angle. The moment path M forms in this embodiment the transmission path exclusively for the braking torques. For the description of the components and their mode of operation is on the description of the 1 referenced, wherein like reference numerals designate the same components.

LIST OF REFERENCE NUMBERS

1

vehicle

2

steered axle

3

another axis

4 a, b

steered wheels

5

steering

6a, b

friction brakes

7a, b

Arm

8th

vehicle chassis

9

steering wheel

10

sensor device

11

control module

12

drive

13

Torque transfer device

14a, b

drive shafts

15a, b

inner joint

16a, b

outer joint

17

Friktionsbremseinrichtung

18

landing gear

19

upper wishbone

20

lower wishbone

21

steering axle

22

wheel carrier

23

brake disc

24

caliper

25a, b

shaft section

M

Torque path for the drive torque and / or the braking torque

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102004034126 A1 [0003]

Claims (10)

Landing gear (18) for a vehicle (1), having a vehicle chassis (8), with a steered axle (2), wherein on the steered axle (2) a first and a second steered wheel (4a, b) are arranged with a friction brake device (17) for braking the steered wheels (4a, b), characterized in that the friction brake device (17) is arranged on the vehicle chassis (8). Suspension (18) to Claim 1 characterized by a control module (11) for controlling the friction brake device (17), wherein the control module (11) controls the friction brake device (17) to apply different braking torques to the two steered wheels (4a, b). Suspension (18) to Claim 2 , characterized in that the control module (11) is designed to implement a power steering and / or steering of the vehicle (1). Landing gear (18) according to one of the preceding claims, characterized in that the friction brake device (17) has a first friction brake (6a) and a second friction brake (6b), wherein the first friction brake (6a) for braking the first steered wheel (4a) and the second friction brake (6b) is for braking the second steered wheel (4b). Landing gear (18) according to one of the preceding claims, characterized by a first and a second wheel suspension (7a, b), wherein the wheel suspensions (7a, b) each have a coupling between the vehicle chassis (8) and the steered wheel (4a, b) form. Chassis (18) according to one of the preceding claims, characterized in that it comprises a first and a second propeller shaft (14a, b) for transmitting the braking torque, wherein the friction brake device (17) and / or the friction brakes (6a, b) in the torque path (M) in front of the respective propeller shaft (14a, b) is arranged. Chassis (18) according to one of the preceding claims, characterized in that the steered axle (2) is designed as a passive and / or non-driven axle. Landing gear (18) according to one of the preceding Claims 1 to 6 characterized by a drive (12) for generating a drive torque, wherein the drive (12) is arranged on the vehicle chassis (8), and by a torque transfer device (13) for transmitting the drive torque from the drive (12) to the steered wheels ( 4a, b) of the steered axle (2). Chassis (18) according to one of the preceding claims, characterized in that the Störkrafthebelarm (r_AN) is greater than the Lenkrollenhalbmesser (r_0) is formed. Vehicle (1) with the chassis (18) according to one of the preceding claims.

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