CN100450851C

CN100450851C - Power redirector of awl-end screw axial limiting

Info

Publication number: CN100450851C
Application number: CNB200710078230XA
Authority: CN
Inventors: 黄达时; 郭全; 彭华东; 尹崇敬; 刘建华; 陈琼
Original assignee: SAIC Iveco Hongyan Commercial Vehicle Co Ltd
Current assignee: SAIC Iveco Hongyan Commercial Vehicle Co Ltd; Chongqing Hongyan Motor Co Ltd
Priority date: 2007-02-14
Filing date: 2007-02-14
Publication date: 2009-01-14
Anticipated expiration: 2027-02-14
Also published as: CN101011978A

Abstract

The invention relates to a conical radial stop screw power steering machine. Per conical end stop screw, it effectively prevents the nylon retainer broken, bearing base string movement resulted O type ring wearing and oil leakage due to axial string movement of the rotating rocker arm, expanded radial space of the rocker arm shaft gear fan, expanding gear width, increasing bearing ability of the gear, increased bearing width C to use cheaper rolling bearing, reducing cost, with eccentric adjusting steering gear teething gap less than 2mm, not only reducing the machining precision of the steering gear shell, reducing gear fan common normal tolerance, rack spline length bar tolerance, being able to increase gear fan and rack smoothness, improving teething feature of the steering gear, ensuring the free from gap, reducing rotation moment undulating value, effectively preventing the rack stress accumulation but broken.

Description

Conical radial stop screw power steering machine

Technical field

The present invention relates to a kind of automobile integral power steering, especially relate to a kind of conical radial stop screw power steering machine.

Background technology

At present lot of domestic and international deflector originating firm has adopted as shown in Figure 9, with nylon back-up ring 16,17 and circlip for bore 8,13 restrictive axes bearings 5,15 and pitman shaft 3 axially movable power steerings, because nylon back-up ring, the dimension limit of circlip for bore thickness and slot pitch H is bigger, maximum clearance between the H can reach 2mm, therefore in the motor turning process, the road surface is to the antagonistic force of steered wheel, impulsive force is passed to the axial component of pitman shaft 3 by drag link, pitman shaft is moved to the left and right and by nylon back-up ring impact groove bearing sleeve, cause the nylon back-up ring to damage, O shape circle 10,11 premature wears and leakage of oil.

Summary of the invention

The purpose of this invention is to provide a kind of conical radial stop screw power steering machine that can overcome above-mentioned defective, a kind of conical radial stop screw power steering machine, comprise steering gear housing, piston, pitman shaft, left and right sides bearing, the Y-axis bearing, circlip for bore, O shape circle, it is characterized in that: described left shaft holder is provided with 4 first screws, connect first awl-end screw axial restriction pitman shaft in described first screw, respectively be provided with dovetail groove on the cylindrical of described Y-axis bearing, be provided with second screw in the bottom of steering gear housing and the correspondence position of described dovetail groove, be connected with second awl-end screw in described second screw, the conical surface top of described second awl-end screw is to the inclined-plane of dovetail groove.

Described left and right sides bearing is a needle bearing, and two end faces of Y-axis bearing are provided with L shaped chimb, and this needle bearing is riveted tightly by the L shaped chimb of inner end surface, and the L shaped chimb difference riveting of the other end of described Y-axis bearing is in the axial R shape of steering gear housing groove.

Described piston middle teeth groove form for seven sections by A1-B1, B1-C1, C1-D1, D1-D2, D2-C2, C2-B2, B2-A2, D1-C1 and D2-C2 simulated automotive straight-line travelling turn to ± 4 ° of positions, deflector tooth fan and tooth bar do not have the gap and mesh in this scope; C1-B1 and C2-B2 are that transition region simulated automotive straight-line travelling position turns to 4 ° to 6 ° to the left or to the right, and the back lash of deflector tooth fan and tooth bar changes to 0.2 millimeter from zero diametrically; The back lash of B1-A1 and B2-A2 section deflector tooth fan and tooth bar is 0.2 millimeter, and the D1-D2 section is that bottom land is Duoed 0.2 millimeter apart from the piston center than the standard teeth groove.

Useful technique effect of the present invention is: thereby 1, actv. prevented that the fracture of nylon back-up ring, bearing seat string that the pitman shaft axial motion causes are moving, causes O type circle premature wear and leakage of oil; 2, enlarged the axial space that the pitman shaft tooth is fanned owing to having cancelled the nylon back-up ring, the width B that can widen tooth has improved the moment of torsion of load-carrying capacity＜unit module output of tooth 〉; The width C special-purpose cylindrical bearing that price is high that can increase bearing changes cheap needle bearing into, has reduced cost; 3, because the back lash of eccentric adjustment deflector radially setting range can reach 2 millimeters at most, not only can reduce steering gear housing width between centers working accuracy greatly, reduce the common normal error of tooth fan, the length bar of tooth bar teeth groove is apart from error, improve the qualification rate of product, reduce cost of product, but also available universal grinder grinding tooth fan and tooth bar easily, improve the surface finish of tooth fan and tooth bar, improved the meshing characteristic of deflector, guarantee deflector straight-line travelling position ± 4 ° of no gaps, reduce the undulating quantity of steering torque, and prevent the tooth bar stress concentration effectively and rupture.

Description of drawings

Fig. 1 is a conical radial stop screw power steering machine assembly cutaway view;

Fig. 2 is a steering gear housing left side cutaway view;

Fig. 3 is that the A of Fig. 2 is to partial view;

Fig. 4 is the left shaft holder cutaway view;

Fig. 5 is a right bearing seat cutaway view;

Fig. 6 is a deflector piston cutaway view;

Fig. 7 is deflector piston (middle teeth groove) partial enlarged view;

Fig. 8 is a pitman shaft;

Fig. 9 is the spacing power steering gear assembly cutaway view of nylon back-up ring;

In the accompanying drawing: steering gear housing 1, piston 2, pitman shaft 3, left and right sides bearing 4,14, Y-axis bearing 5,15, the second screw 1-1, the first screw 5-1, dovetail groove 5-2,15-1, L shaped chimb 5-3,15-2, R shape groove 1-2, first awl-

end screw

6,7, second awl-end screw 9,12, circlip for bore 8,13, O shape circle 10,11, nylon back-up ring 16,17.

The specific embodiment

Referring to accompanying drawing, a kind of conical radial stop screw power steering machine comprises steering gear housing 1, piston 2, pitman shaft 3, left and right sides bearing 4,14, Y-axis bearing 5,15, circlip for bore 8,13, O shape circle 10,11; Left shaft holder 5 is provided with 4 first screw 5-1, connect first awl-end screw 6 respectively in the described first screw 5-1, moving axially of 7 axial restraint pitman shafts 3, described Y-axis bearing 5, respectively be provided with dovetail groove 5-2 on 15 the cylindrical, 15-1, bottom and dovetail groove 5-2 at steering gear housing 1, the correspondence position of 15-1 is provided with the second screw 1-1, be connected with second awl-end screw, 9,12, second awl-end screw 9 in the described second screw 1-1,12 the conical surface pushes up to dovetail groove 5-2, the inclined-plane of 15-1.The left end of left shaft holder 5 limits it and is moved to the left by being assemblied in circlip for bore 8 in the steering gear housing groove, and the gap of eliminating bearing seat 5 left ends and circlip for bore 8 by the awl end of second awl-end screw 9, the right-hand member of right bearing seat 15 limits it and moves right by being assemblied in circlip for bore 13 in the steering gear housing groove, and by awl end elimination right bearing seat 15 right-hand members of second awl-end screw 12 and the gap of circlip for bore 13, pitman shaft 3 limits the axial left and right of it by first awl-

end screw

6,7 and moves.And actv. prevented pitman shaft 3 axial motions and 16,17 fractures of the nylon back-up ring that causes, Y-axis bearing 5,15 strings are moving, causes O type circle 10,11 premature wears and leakage of oil;

Described left and right sides bearing 4,14 is a needle bearing, Y-axis bearing 5, two end faces of 15 are provided with L shaped chimb 5-3,15-2, this needle bearing 4,14 pass through the L shaped chimb 5-3 of inner end surface respectively, 15-2 is riveted tightly, in case longitudinal travel, described Y-axis bearing (5, the L shaped chimb 5-3 of other end 15), the 15-2 riveting in steering gear housing 1 axial R shape groove 1-2, the rotation of restrictive axes bearing 5,15.Enlarged the axial space of pitman shaft 3 teeth fans owing to cancelled nylon back-up ring 16,17, the width B that can widen tooth has improved the moment of torsion of the load-carrying capacity＜unit module output of tooth 〉; The width C special-purpose cylindrical bearing that price is high that can increase bearing changes cheap needle bearing into, is example with CQ8211 diameter of axle ￠ 55, cost-saved about 20 yuan of deflector.

The tooth bar both sides teeth groove of described piston 2 is a standard tooth form, middle teeth groove is made up of for seven sections A1-B1, B1-C1, C1-D1, D1-D2, D2-C2, C2-B2, B2-A2, D1-C1 and D2-C2 simulated automotive straight-line travelling turn to ± 4 ° of positions, and deflector tooth fan and tooth bar do not have the gap engagement in this scope; C1-B1 and C2-B2 are that transition region simulated automotive straight-line travelling position turns to 4 ° to 6 ° to the left or to the right, and the back lash of deflector tooth fan and tooth bar changes to 0.2 millimeter from zero diametrically; The back lash of B1-A1 and B2-A2 section deflector tooth fan and tooth bar is 0.2 millimeter, and the D1-D2 section is that bottom land is Duoed 0.2 millimeter apart from the piston center than the standard teeth groove.The adjustment of the back lash of deflector tooth fan and tooth bar is to reach requirement by rotating the inside and outside left and right bearing seat 5,15 of accentric, guarantees that the back lash of deflector tooth fan and tooth bar remains unchanged.

Because the back lash of eccentric adjustment deflector radially setting range can reach 2 millimeters at most, not only can reduce steering gear housing width between centers working accuracy greatly, reduce the common normal error of tooth fan, the length bar of tooth bar teeth groove is apart from error, improve the qualification rate of product, reduce cost of product, but also available universal grinder grinding tooth fan and tooth bar easily, improve the surface finish of tooth fan and tooth bar, improved the meshing characteristic of deflector, guarantee deflector straight-line travelling position ± 4 ° of no gaps, reduce the undulating quantity of steering torque, and prevent the tooth bar stress concentration effectively and rupture.

Claims

1, a kind of conical radial stop screw power steering machine, comprise steering gear housing (1), piston (2), pitman shaft (3), left and right sides bearing (4,14), Y-axis bearing (5,15), circlip for bore (8,13), O shape circle (10,11), it is characterized in that: described left shaft holder (5) is provided with 4 first screws (5-1), connect first awl-end screw (6 in described first screw (5-1) respectively, 7) axial restraint pitman shaft (3) respectively is provided with dovetail groove (5-2 on the cylindrical of described Y-axis bearing (5,15), 15-1), (5-2, correspondence position 15-1) are provided with second screw (1-1), are connected with second awl-end screw (9 in described second screw (1-1) at the bottom of steering gear housing (1) and described dovetail groove, 12), the conical surface top of described second awl-end screw (9,12) is to described dovetail groove (5-2, inclined-plane 15-1); Described left and right sides bearing (4,14) be needle bearing, two end faces of Y-axis bearing (5,15) be provided with L shaped chimb (5-3,15-2), this needle bearing (4,14) respectively the L shaped chimb by inner end surface (5-3 15-2) is riveted tightly, described Y-axis bearing (5, (5-3,15-2) the difference riveting is in the axial R shape groove (1-2) of steering gear housing (1) for the L shaped chimb of other end 15).

2, conical radial stop screw power steering machine according to claim 1, it is characterized in that: the middle teeth groove of described piston (2) is made up of for seven sections A1-B1, B1-C1, C1-D1, D1-D2, D2-C2, C2-B2, B2-A2, D1-C1 and D2-C2 simulated automotive straight-line travelling turn to ± 4 ° of positions, and deflector tooth fan and tooth bar do not have the gap engagement in this scope; C1-B1 and C2-B2 are that transition region simulated automotive straight-line travelling position turns to 4 ° to 6 ° to the left or to the right, and the back lash of deflector tooth fan and tooth bar changes to 0.2 millimeter from zero diametrically; The back lash of B1-A1 and B2-A2 section deflector tooth fan and tooth bar is 0.2 millimeter, and the D1-D2 section is that bottom land is Duoed 0.2 millimeter apart from the piston center than the standard teeth groove.