WO2022037953A1 - Lenkgetriebe für eine kugelmutter-hydrolenkung eines kraftfahrzeugs und lenksystem - Google Patents
Lenkgetriebe für eine kugelmutter-hydrolenkung eines kraftfahrzeugs und lenksystem Download PDFInfo
- Publication number
- WO2022037953A1 WO2022037953A1 PCT/EP2021/071851 EP2021071851W WO2022037953A1 WO 2022037953 A1 WO2022037953 A1 WO 2022037953A1 EP 2021071851 W EP2021071851 W EP 2021071851W WO 2022037953 A1 WO2022037953 A1 WO 2022037953A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure chamber
- steering gear
- cylindrical space
- steering
- piston
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/20—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle specially adapted for particular type of steering gear or particular application
- B62D5/24—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle specially adapted for particular type of steering gear or particular application for worm type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/10—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of power unit
- B62D5/12—Piston and cylinder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D7/00—Steering linkage; Stub axles or their mountings
- B62D7/22—Arrangements for reducing or eliminating reaction, e.g. vibration, from parts, e.g. wheels, of the steering system
- B62D7/226—Arrangements for reducing or eliminating reaction, e.g. vibration, from parts, e.g. wheels, of the steering system acting on the steering gear
Definitions
- the invention relates to a steering gear for a ball nut hydraulic steering system of a motor vehicle.
- the invention also relates to a steering system for a motor vehicle.
- DE 10 2016 122 743 A1 discloses a steering gear for a ball nut hydro-steering system of a motor vehicle with a steering gear housing in which a working cylinder is formed, and a steering spindle connection formed on the steering gear housing, which is designed to transmit a rotary movement initiated by a steering spindle to a worm and to convert via a ball screw into an axial movement of a piston arranged in the working cylinder, wherein the piston divides the working cylinder into a first pressure chamber and a second pressure chamber, and wherein the first pressure chamber has a larger volume than the second pressure chamber.
- a segmented shaft is provided which is arranged at right angles to the longitudinal axis of the piston and is connected to the piston by a toothing formed in the piston, the segmented shaft being able to be set in rotary motion by the axial movement of the piston.
- shocks from the road act on the steering gear in such a conventional steering gear, these can be transmitted via the mechanical power train to the two cylinder chambers filled with hydraulic fluid and supported there. Since hydraulic fluid, especially oil, is compressible, the Due to the larger volume in the large cylinder chamber, the stiffness available for force support is lower than in the small one and can exert an influence on the steering.
- the force support is a mass-spring system with different rigidities. In certain driving situations, this system can resonate. Since the vibration has a frequency with a fixed period, but the stiffness is different, the adjustment path increases continuously in the direction of lower stiffness, which can cause the wheels to turn.
- the invention is therefore based on the object of providing an improved steering gear for a ball nut hydraulic steering system of a motor vehicle, which compensates for the unequal rigidities of the two pressure chambers and thus prevents impacts acting on the steering gear from the road from having an influence on the steering.
- the present invention provides a steering gear for an automotive ball nut power steering system.
- the steering gear includes a steering gear housing in which a working cylinder is formed. Furthermore, the steering gear includes a steering spindle connection formed on the steering gear housing, which is designed to transmit a rotary motion initiated by a steering spindle to a worm and to convert it via a ball screw into an axial motion of a piston arranged in the working cylinder, the piston converting the working cylinder into a first pressure chamber and a second pressure chamber divided, and wherein the first pressure chamber has a larger volume than the second pressure chamber.
- the steering gear comprises a segmented shaft arranged at right angles to the longitudinal axis of the piston, which is connected to the piston by a toothing formed in the piston, with the segmented shaft being able to be rotated by the axial movement of the piston.
- the steering gear has a damper device which interacts with the second pressure chamber and is designed to dampen a compression stiffness of the hydraulic fluid volume arranged in the second pressure chamber in such a way that the compression stiffness of the hydraulic fluid volume arranged in the second pressure chamber is essentially the same as the compression stiffness of the hydraulic fluid volume arranged in the first Pressure chamber arranged hydraulic fluid volume corresponds.
- the present invention also creates a steering system for a motor vehicle with a steering spindle and the steering gear according to the invention, the steering gear being designed to absorb a rotary movement introduced by the steering spindle.
- One idea of the present invention is to compensate for the unequal stiffness of the two pressure chambers in the mold by providing the damping device which interacts with the second pressure chamber and is integrated directly in the steering gear or is connected as a separate unit via a pressure line to the second pressure chamber. that the more rigid, ie smaller, pressure chamber is adjusted to the lower rigidity of the large pressure chamber by the additional damping device.
- the damping device which interacts with the second pressure chamber and is integrated directly in the steering gear or is connected as a separate unit via a pressure line to the second pressure chamber.
- the damper device has a compensating chamber which is fluidically connected to the second pressure chamber and in which a compensating piston loaded with a predetermined spring force by a spring damper can be moved axially.
- the constructive solution is based on the working mechanism of a spring damper, which adapts the higher rigidity of the second pressure chamber to the lower rigidity of the first pressure chamber due to the fluidic connection of the compensation chamber with the second pressure chamber of the steering gear.
- a spring characteristic of the spring damper is designed such that spring damping caused by the spring damper reduces the compression stiffness of the hydraulic fluid volume arranged in the second pressure chamber to a level of the compression stiffness of the hydraulic fluid volume arranged in the first pressure chamber.
- a balanced compression rigidity can thus be achieved in an advantageous manner in both pressure chambers and the return impulse occurring when the hydraulic fluid relaxes can thus be prevented from having an influence on the mechanical power train in the sense of turning the steering.
- the damper device has a cylindrical space which is integrally formed with the steering gear housing or arranged separately from the steering gear housing and which is fluidically connected to the second pressure chamber via a bore and/or a hydraulic line.
- a defined volume of hydraulic fluid can thus be introduced from the second pressure chamber into the cylindrical space of the damper device via the bore, whereby the cylindrical space, in combination with the spring characteristic of the spring damper, enables the effect of equalizing the stiffness of the two pressure chambers.
- the compensating piston is mounted in the cylindrical space, in particular is slide-mounted, and the compensating piston is sealed against the housing of the cylindrical space by a seal inserted between a bearing and a housing of the cylindrical space.
- the spring damper has at least one plate spring, in particular a plurality of plate springs, which is accommodated in the cylindrical space on a side opposite the compensation chamber.
- the provision of the at least one plate spring, preferably the plurality of plate springs, is particularly advantageous in the present embodiment, since this enables high force transmission with a small stroke.
- a section of the cylindrical space in which the spring damper is arranged is dry and sealed off from the outside or is connected to a return of an oil circuit via a hydraulic line.
- a lifetime seal can be used, which allows the section of the cylindrical space in which the spring damper is arranged to be dry.
- a floating seal can be used, for example, which allows excess hydraulic fluid to flow back into the oil circuit.
- the compensating piston can be placed without play by the spring damper against a stop of the damper device which is arranged adjacent to the second pressure chamber and on a first axial end section of the cylindrical space.
- the cylindrical space of the damper device has a screw-in cap on a second axial end section of the cylindrical space arranged opposite the first axial end section of the cylindrical space, which screw-in cap preloads the spring damper.
- the preload of the spring damper in connection with its spring characteristic enables an exact compensation of the rigidity of the two pressure chambers.
- the cylindrical space of the damper device has a stepped bore, with the compensating piston being arranged in a first section of the cylindrical space with a smaller diameter, and with the spring damper being arranged in a second section of the cylindrical space with a larger diameter.
- the piston can thus advantageously be guided as a spring damper in a separate section of the cylindrical space. Furthermore, the gradation of the cylindrical space enables improved tightness of the compensation chamber, in particular of the part of the compensation chamber that receives hydraulic fluid.
- FIG. 1 shows a schematic representation of a steering gear for a ball nut hydraulic steering system of a motor vehicle according to a preferred embodiment of the invention.
- FIG. 2 shows a schematic representation of the steering gear for the ball nut hydraulic steering of the motor vehicle according to a further preferred embodiment of the invention.
- the steering gear 1 shown in FIG. 1 is part of a ball nut hydraulic steering system of a steering system of a motor vehicle.
- the remaining components of the ball nut power steering system, such as a rotary slide and a primary valve, are not shown in the present illustration.
- the steering gear 1 has a steering gear housing 2 in which a working cylinder 10 is formed.
- the steering gear 1 also has a steering spindle connection 14 formed on the steering gear housing 2, which is designed to transmit a rotational movement initiated by a steering spindle 42 to a worm 16 and to convert it via a ball screw 18 into an axial movement of a piston 20 arranged in the working cylinder 10.
- the piston 20 divides the working cylinder 10 into a first pressure chamber 22 and a second pressure chamber 24.
- the first pressure chamber 22 has a larger volume than the second pressure chamber 24.
- the steering gear 1 has a segmented shaft 26 arranged at right angles to the longitudinal axis L of the piston, which is connected to the piston 20 by a toothing formed in the piston 20, wherein the segmented shaft 26 can be rotated by the axial movement of the piston 20.
- the steering gear 1 has a damper device 28 that interacts with the second pressure chamber 24 and is designed to dampen a compression stiffness of the hydraulic fluid volume arranged in the second pressure chamber 24 in such a way that the compression stiffness of the hydraulic fluid volume arranged in the second pressure chamber 24 essentially corresponds to the compression stiffness corresponds to the hydraulic fluid volume arranged in the first pressure chamber 22 .
- the damper device 28 has a compensation chamber 30 which is fluidically connected to the second pressure chamber 24 .
- a compensating piston 34 acted upon by a spring damper 32 with a predetermined spring force F can be moved axially.
- the spring damper 32 can be connected to a return line RL of an oil circuit, for example via a hydraulic line.
- a spring characteristic of the spring damper 32 is designed such that spring damping caused by the spring damper 32 reduces the compression stiffness of the hydraulic fluid volume arranged in the second pressure chamber 24 to a level of the compression stiffness of the hydraulic fluid volume arranged in the first pressure chamber 22.
- the damper device 28 has a cylindrical space 36 formed integrally with the steering gear housing 2 .
- the cylindrical space 36 is fluidically connected to the second pressure chamber 24 via a bore 37a.
- the compensating piston 34 is mounted in the cylindrical space 36, in particular slide-mounted.
- the compensating piston 34 is sealed against the housing 35 of the cylindrical space 36 by a seal 40 inserted between an O-ring or prestressing ring 38 and a housing 35 of the cylindrical space 36 .
- the spring damper 32 has a plurality of disk springs, which are accommodated in the cylindrical space 36 on a side opposite the compensation chamber 30 . Furthermore, a section of the cylindrical space 36 in which the spring damper 32 is arranged is dry and sealed from the outside.
- the compensating piston 34 can be placed without play by the spring damper 32 against a stop of the damper device 28 which is adjacent to the second pressure chamber 24 and is arranged on a first axial end section 36a of the cylindrical space 36 .
- the cylindrical space 36 of the damper device 28 has a screw-in cap 39 on a second axial end portion 36b of the cylindrical space 36 arranged opposite the first axial end portion 36a of the cylindrical space 36 , which screw-in cover 39 prestresses the spring damper 32 .
- the cylindrical space 36 of the damper device 28 also has a stepped bore.
- the compensating piston 34 is arranged in a first section 36c of the cylindrical space 36 with a smaller diameter
- the spring damper 32 is arranged in a second section 36d of the cylindrical space 36 with a larger diameter.
- FIG. 2 shows a schematic representation of the steering gear for the ball nut hydraulic steering system of the motor vehicle according to a further preferred embodiment of the invention.
- the damper device 128 interacting with the second pressure chamber 124 is arranged separately from the steering gear.
- the damper device 128 is fluidically connected to the second pressure chamber 124 via a hydraulic line 37b.
- the hydraulic line 37b is connected to the compensation chamber 130 of the damper device 128 in such a way that the hydraulic line 37b is fluidically connected to the compensation chamber 130 via a central or alternatively eccentric region of a wall of the damper device 128 .
- the damper device 128 has a compensation chamber 130 which is fluidically connected to the second pressure chamber 124 .
- a compensating piston 134 acted upon by a spring damper 132 with a predetermined spring force F can be moved axially.
- the spring damper 132 can be connected to a return line RL of an oil circuit, for example via a hydraulic line.
- the compensating piston 134 is mounted in the cylindrical space 136, in particular in a slide-mounted manner.
- the compensating piston 134 is sealed against the housing 135 of the cylindrical space 136 by a seal 140 inserted between an O-ring or preload ring 138 and a housing 135 of the cylindrical space 136 .
- the cylindrical space 136 of the damper device 128 has an opposite to the first axial end portion of the cylindrical space 136 arranged second axial end portion of the cylindrical space 136 has a screw-in cap 139, which biases the spring damper 132.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Steering Mechanism (AREA)
- Transmission Devices (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202180050595.XA CN115884915A (zh) | 2020-08-20 | 2021-08-05 | 用于机动车辆的球形螺母式液力转向机构的转向传动机构以及转向*** |
BR112023002652A BR112023002652A2 (pt) | 2020-08-20 | 2021-08-05 | Engrenagem de direção para uma direção hidráulica de porca esférica de um veículo e sistema de direção |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020210596.0A DE102020210596A1 (de) | 2020-08-20 | 2020-08-20 | Lenkgetriebe für eine Kugelmutter-Hydrolenkung eines Kraftfahrzeugs und Lenksystem |
DE102020210596.0 | 2020-08-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022037953A1 true WO2022037953A1 (de) | 2022-02-24 |
Family
ID=77398547
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2021/071851 WO2022037953A1 (de) | 2020-08-20 | 2021-08-05 | Lenkgetriebe für eine kugelmutter-hydrolenkung eines kraftfahrzeugs und lenksystem |
Country Status (4)
Country | Link |
---|---|
CN (1) | CN115884915A (de) |
BR (1) | BR112023002652A2 (de) |
DE (1) | DE102020210596A1 (de) |
WO (1) | WO2022037953A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115195859B (zh) * | 2022-07-21 | 2023-12-15 | 广东星星汽配科技有限公司 | 一种具有削弱转向波动及转向噪音的汽车转向器 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014119039A1 (de) * | 2014-07-25 | 2016-01-28 | Robert Bosch Automotive Steering Gmbh | Pulsationsgedämpfte Servolenkung |
DE102015111344A1 (de) * | 2015-07-14 | 2017-01-19 | Robert Bosch Automotive Steering Gmbh | Pulsationsgedämpfte kugelmutterlenkung |
DE102016122743A1 (de) | 2016-11-25 | 2018-05-30 | Robert Bosch Gmbh | Lenksystem für ein Kraftfahrzeug und Verfahren zum Entlüften eines Lenksystems für ein Kraftfahrzeug |
-
2020
- 2020-08-20 DE DE102020210596.0A patent/DE102020210596A1/de active Pending
-
2021
- 2021-08-05 WO PCT/EP2021/071851 patent/WO2022037953A1/de active Application Filing
- 2021-08-05 BR BR112023002652A patent/BR112023002652A2/pt unknown
- 2021-08-05 CN CN202180050595.XA patent/CN115884915A/zh active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014119039A1 (de) * | 2014-07-25 | 2016-01-28 | Robert Bosch Automotive Steering Gmbh | Pulsationsgedämpfte Servolenkung |
DE102015111344A1 (de) * | 2015-07-14 | 2017-01-19 | Robert Bosch Automotive Steering Gmbh | Pulsationsgedämpfte kugelmutterlenkung |
DE102016122743A1 (de) | 2016-11-25 | 2018-05-30 | Robert Bosch Gmbh | Lenksystem für ein Kraftfahrzeug und Verfahren zum Entlüften eines Lenksystems für ein Kraftfahrzeug |
Also Published As
Publication number | Publication date |
---|---|
BR112023002652A2 (pt) | 2023-04-04 |
CN115884915A (zh) | 2023-03-31 |
DE102020210596A1 (de) | 2022-02-24 |
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