GB2074693A - A steering gear - Google Patents

A steering gear Download PDF

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Publication number
GB2074693A
GB2074693A GB8108114A GB8108114A GB2074693A GB 2074693 A GB2074693 A GB 2074693A GB 8108114 A GB8108114 A GB 8108114A GB 8108114 A GB8108114 A GB 8108114A GB 2074693 A GB2074693 A GB 2074693A
Authority
GB
United Kingdom
Prior art keywords
steering
teeth
casing
bushes
shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB8108114A
Other versions
GB2074693B (en
Inventor
Dieter Elser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of GB2074693A publication Critical patent/GB2074693A/en
Application granted granted Critical
Publication of GB2074693B publication Critical patent/GB2074693B/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F16H57/022—Adjustment of gear shafts or bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D3/00—Steering gears
    • B62D3/02—Steering gears mechanical
    • B62D3/04—Steering gears mechanical of worm type
    • B62D3/06—Steering gears mechanical of worm type with screw and nut
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H19/00—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion
    • F16H19/02—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion
    • F16H19/04—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion comprising a rack
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H2057/02039—Gearboxes for particular applications
    • F16H2057/02082—Gearboxes for particular applications for application in vehicles other than propelling, e.g. adjustment of parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F16H57/022—Adjustment of gear shafts or bearings
    • F16H2057/0222—Lateral adjustment
    • F16H2057/0224—Lateral adjustment using eccentric bushes

Abstract

The steering gear comprises a casing 1 housing a steering nut 2 with rack-like teeth 2A meshing with straight, cylindrical teeth 4 of a sector-carrying shaft 3. The shaft 3 is mounted in the casing by eccentric bushes 5, 6 via roller bearings 7. The bushes are constructed as bearing covers and serve, during assembly of the steering gear, to adjust the shaft transversely to its axis to take up clearance between its teeth 4 and the teeth 2A of the steering nut. The bushes are rotated for adjustment purposes via grooves 14 and are secured axially by locking rings 8, 9. Annular recesses 10, 11 in the bore of casing or in the bushes form annular gaps between the bushes and the casing. Transverse bores 12, 12A and 13, 13A in the casing provide access to the respective gaps from outside which are filled via the bores with a hardenable, liquid plastics. <IMAGE>

Description

SPECIFICATION A steering gear This invention relates to a steering gear of the kind comprising a steering gear casing which accommodates a steering nut, having rack-like teeth and a sector-carrying shaft having cylindrical teeth which mesh with the rack-like teeth of the steering nut, and a drop arm attached to the sector-carrying shaft, said shaft being mounted in eccentric bushes and being adjustable in the direction of the teeth by means of said bushes transversely to its axis.
A steering gear of the foregoing kind for vehicles is known from, for example, German Patent Specification 10 82 139. Such steering gear has a casing with a steering worm which can be driven via a steering-wheel spindle, supported in two bearings, and which meshes with a steering nut. The steering nut meshes via rack-like teeth with a toothed sector. The toothed sector is rigidly connected to a steering shaft carrying a drop arm. The drop arm is connected via a steering linkage to the front wheels of the vehicle. To facilitate the adjustment of the meshing of the steering nut and the toothed sector, each of the two bearings of the steering-wheel spindle has an outer bearing bush formed with an eccentric bore for receiving an inner eccentric bearing bush.The outer eccentric bearing bush can be rotated in a screwthreading in relation to the steering gear casing and be fixed in any required position by a check nut.
Such screwthreaded bearing bushes, which are retained in the steering-gear casing by the prestressing of the screwthreading, have a relatively low supporting capacity and are suitable only for small bearing forces. The prestressing which can be produced by the check nut is therefore inadequate for higher bearing forces.
The invention aims at enabling more heavily loaded steering gears to be adjusted while retaining their conventional dimensions.
Accordingly, the present invention consists in a steering gear comprising a steering gear casing which accommodates a steering nut, having rack-like teeth and a sector-carrying shaft having cylindrical teeth which mesh with the rack-like teeth of the steering nut, and a drop arm attached to the sector-carrying shaft, said shaft being mounted in eccentric bushes and being adjustable in the direction of the teeth by means of said bushes transversely to its axis, wherein the eccentric bushes are constructed as bearing covers, annular gaps are provided between the bearing covers and the steering-gear casing, each annular gap is accessible from outside through bores in the casing, and wherein the annular gaps are filled with a hardenable liquid plastics.
During assembly, the bearing covers are inserted into the bore in the casing with a predetermined rotational clearance. After the sector teeth have been adjusted in the direction of the teeth of the steering nut, the annular gaps are filled with the hardenable liquid plastics. The filling of the annular gaps completely eliminates the clearance required for adjustment, the result being that the bearing covers are very rigidly fixed. The bearing covers and the casing can therefore reliably absorb the high alternating exertion of forces of the sector teeth. The cylindrical straight teeth used in the steering gear of the invention cause the meshing teeth to roll upon one another with linear contact. The result is an appreciable increase in strength.If the steering nut at the same time is constructed as a power piston of a power-assisted steering system, the high forces acting as a result on the sector-carrying shaft can be absorbed with high operational safety by the bearing covers or by the steering-gear casing.
In order that the invention may be more readily understood, reference is made to the accompanying drawings which illustrate diagrammatically and by way of example an embodiment thereof, and in which: Figure 1 is a cross-section through a powerassisted steering system with a sector-carrying shaft, and Figure 2 is a cross-section on the line ll-ll of Fig.1.
A power piston 2, also acting as a steering nut and having rack-like teeth 2A, is mounted in a steering-gear casing 1. When a steeringwheel spindle (not shown) is rotated, the power piston 2 effects an axial movement in the usual manner. The precise construction and operation of such a power-assisted steering gear can be gathered, for example, from German Patent Specification 20 02 340.
The rack-like teeth 2A on the power piston 2 mesh with a sector-carrying shaft 3. The shaft 3 has cylindrical teeth 4 and is mounted in roller bearings 7 via two bearing covers 5 and 6 which are constructed as eccentric bushes. The bearing covers 5 and 6 can be suitably rotated to adjust a clearance between the teeth 4 of the sector-carrying shaft 3 and the teeth 2A of the power piston 2. Two locking rings 8 and 9 fix the two bearing covers 5 and 6 axially. The two locking rings 8 and 9 are screwed into the steering-gear casing 1. According to the invention the steering-gear casing 1 has annular recesses 10 and 11 which form annular gaps between the outer peripheral surfaces of the bushes and the casing and which are respectively accessible from outside via two bores 12, 1 2A and 13, 1 3A. Alternatively, the annular recesses 10 and 11 may be formed in the bearing covers 5 and 6.
The bearing covers 5, 6 are rotated by way of entraining grooves 1 4 until there is no clearance left between the teeth 2A and 4.
The bearing covers 5 and 6 are then secured by the locking rings 8 and 9. Subsequently the annular recesses 10 and 11 are filled with a hardenable liquid plastics K via the bores 1 2 and 1 3. The enclosed air can escape via the bores 12A and 13A. Seals 15 and 16 both seal a pressure chamber 1 7 and also separate the annular recesses 10 and 11 therefrom. The axial forces of the sector-carrying shaft 3 are absorbed via a butting ring 18.
After the plastics K has hardened, the bearing covers 5 and 6 are mounted very rigidly and completely free from clearance in the steering-gear casing 1, so that the bearing covers cannot yield in the direction of the tooth forces acting on the sector-carrying shaft.
For security against twisting, the outer edges of the locking rings 8 and 9 may be partially beaded over in the direction of the steering-gear casing 1 and the bearing covers 5 and 6.

Claims (3)

1. A steering gear comprising a steeringgear casing which accommodates a steering nut, having rack-like teeth and a sector-carrying shaft having cylindrical teeth which mesh with the rack-like teeth of the steering nut, and a drop arm attached to the sector-carrying shaft, said shaft being mounted in eccentric bushes and being adjustable in the direction of the teeth by means of said bushes transversely to its axis, wherein the eccentric bushes are constructed as bearing covers, annular gaps are provided between the bearing covers and the steering-gear casing, each annular gap is accessible from outside through bores in the casing, and wherein the annular gaps are filled with a hardenable liquid plastics.
2. A steering gear as claimed in claim 1, wherein the annular gaps are formed by annular recesses in the steering-gear casing.
3. A steering gear, substantially as herein described with reference to and as shown in the accompanying drawings.
GB8108114A 1980-04-10 1981-03-16 Steering gear Expired GB2074693B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3013855A DE3013855C2 (en) 1980-04-10 1980-04-10 STEERING GEARBOX

Publications (2)

Publication Number Publication Date
GB2074693A true GB2074693A (en) 1981-11-04
GB2074693B GB2074693B (en) 1983-07-13

Family

ID=6099697

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8108114A Expired GB2074693B (en) 1980-04-10 1981-03-16 Steering gear

Country Status (9)

Country Link
JP (1) JPS56146470A (en)
AR (1) AR222430A1 (en)
BR (1) BR8102117A (en)
DE (1) DE3013855C2 (en)
FR (1) FR2480219A1 (en)
GB (1) GB2074693B (en)
IT (1) IT1142401B (en)
PL (1) PL230563A1 (en)
YU (1) YU91881A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984001550A1 (en) * 1982-10-20 1984-04-26 Zahnradfabrik Friedrichshafen Steering mechanism
WO1990013464A1 (en) * 1989-04-29 1990-11-15 Zahnradfabrik Friedrichshafen Ag Steering mechanism for motor vehicles
EP0416188A1 (en) * 1988-08-04 1991-03-13 Bendix Espana S.A. Gear assembly
CN1093482C (en) * 1997-06-26 2002-10-30 罗伯特·博施有限公司 Electric drive unit
DE102004011115B3 (en) * 2004-03-08 2005-09-08 Rhein-Getriebe Gmbh Bearing adjustment system for worm drive has bearings In sleeves with axes at acute angle to centerline of worm so that longitudinal movement of sleeves causes slight lateral movement of worm
EP1610987B1 (en) * 2003-03-27 2013-02-20 Robert Bosch Gmbh Electric drive unit
CN115285211A (en) * 2022-08-31 2022-11-04 奇瑞汽车股份有限公司 Steering gear rack and pinion bearing structure

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3138387A1 (en) * 1981-09-26 1983-04-07 Gerhard 8521 Uttenreuth Rühlemann Movement counter
US4788877A (en) * 1987-03-09 1988-12-06 General Motors Corporation Composite housing for rack and pinion power steering gear
DE4419769C2 (en) * 1994-06-06 1999-09-16 Teves Gmbh Alfred Worm gear
DE102010030942A1 (en) * 2010-07-05 2012-01-05 Zf Lenksysteme Gmbh Housing for a steering system
CN111828556A (en) * 2020-07-27 2020-10-27 银川威力传动技术股份有限公司 Pressing nut screwing device of wind driven generator speed reducer

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1310222A (en) * 1919-07-15 Steering-gear
DE1082139B (en) * 1959-01-29 1960-05-19 Daimler Benz Ag Steering gear for motor vehicles
US3606819A (en) * 1969-06-04 1971-09-21 Trw Inc Power steering gear assembly

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984001550A1 (en) * 1982-10-20 1984-04-26 Zahnradfabrik Friedrichshafen Steering mechanism
US4614127A (en) * 1982-10-20 1986-09-30 Zahnradfabrik Friedrichshafen, Ag. Steering gear
EP0416188A1 (en) * 1988-08-04 1991-03-13 Bendix Espana S.A. Gear assembly
WO1990013464A1 (en) * 1989-04-29 1990-11-15 Zahnradfabrik Friedrichshafen Ag Steering mechanism for motor vehicles
CN1093482C (en) * 1997-06-26 2002-10-30 罗伯特·博施有限公司 Electric drive unit
EP1610987B1 (en) * 2003-03-27 2013-02-20 Robert Bosch Gmbh Electric drive unit
DE102004011115B3 (en) * 2004-03-08 2005-09-08 Rhein-Getriebe Gmbh Bearing adjustment system for worm drive has bearings In sleeves with axes at acute angle to centerline of worm so that longitudinal movement of sleeves causes slight lateral movement of worm
CN115285211A (en) * 2022-08-31 2022-11-04 奇瑞汽车股份有限公司 Steering gear rack and pinion bearing structure

Also Published As

Publication number Publication date
AR222430A1 (en) 1981-05-15
JPS56146470A (en) 1981-11-13
BR8102117A (en) 1981-10-13
FR2480219A1 (en) 1981-10-16
IT1142401B (en) 1986-10-08
DE3013855A1 (en) 1981-10-15
PL230563A1 (en) 1981-12-23
DE3013855C2 (en) 1985-10-31
YU91881A (en) 1983-10-31
GB2074693B (en) 1983-07-13
IT8148196A0 (en) 1981-04-03

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee