CN201058624Y

CN201058624Y - Three front axle steering system

Info

Publication number: CN201058624Y
Application number: CNU2007200851466U
Authority: CN
Inventors: 赵永振; 蒋品; 吴振波
Original assignee: HUBEI TRI-RING SPECIAL TRUCK Co Ltd
Current assignee: HUBEI TRI-RING SPECIAL TRUCK Co Ltd
Priority date: 2007-06-01
Filing date: 2007-06-01
Publication date: 2008-05-14
Anticipated expiration: 2017-06-01

Abstract

The utility model discloses a three-front-axle steering system, which comprises a first axle rocker arm, a second axle rocker arm, a third axle rocker arm, and vertical pull rods, wherein the first axle rocker arm is connected with the second axle rocker arm by the vertical pull rod, the second axle rocker arm is added with a dual-functional piston type assisted cylinder, the oil path of the assisted cylinder is connected in parallel with the oil path of the power converter; a transition rocker arm is added between the second axle rocker arm and the third axle rocker arm, the second axle rocker arm, the transitional rocker arm, and the third rocker arm are connected by the vertical pull rod in order; the hinge points of the three vertical pull rods and respective rocker arm are arranged above the rotary center of respective rocker arm. The hinge point of the respective rocker arm and the vertical pull rods are arranged above the rotating shaft so as to avoid the interference of chassis parts such as dampener, fuel box and gas storage cylinder when the arrangement and movement of the vertical pull rods; by adding the transitional rocker arm, the vertical pull rod between the second axle rocker arm and the third axle rocker arm is divided into two segments, thereby avoiding inadequate rigidity caused by overlong pull rod, and not resulting in overlong upper arm of the third axle rocker arm.

Description

Axle steering system before three

Technical field

The utility model belongs to the car chassis system, is specifically related to three preceding axle steering systems.

Background technology

All the time, both domestic and external 8 * 2 commercial vehicles are that two propons turn to substantially, the drive axle postposition, the 3rd non-powered axle is general near the drive axle layout, this bridge adopts that damper is passive to be turned to or do not have a function of turning to, thereby each tire can not roll around same instantaneous center of turn when turning to, and wear on tyres is serious.Also have some vehicles to be arranged in the 3rd non-powered axle near the second bridge back at present and design steering swivel system, but consider that the theoretical first-to-last of axle dimension that axle nuclear distributes is very long, turn radius is too big, seriously exceeds national standard.Therefore, take into account the distribution of axle nuclear and two parameters of wheelbase design when designing this vehicle, and good turning efficiency is arranged, become each manufacturer and make great efforts design-calculated direction.

Summary of the invention

Axle steering system before the purpose of this utility model is to provide a kind of three, realized that wheelbase, the distribution of axle nuclear all can meet design requirement, promptly the 3rd propons is arranged near the rear driving axle front, realizes the active steering function of third axle, the purpose that to reach three propons all be active steering.

The technical solution of the utility model is: axle steering system before three, comprise the first bridge swing arm, the second bridge swing arm, third axle swing arm, longitudinal tie, the first bridge swing arm, the second bridge swing arm connect by longitudinal tie, it is characterized in that: the second bridge swing arm adds double-acting piston power-assisted oil cylinder, and power-assisted oil cylinder oil circuit is in parallel with the power steering oil circuit; Increasing between the second bridge swing arm and third axle swing arm has the transition swing arm, connects by longitudinal tie successively between the second bridge swing arm, transition swing arm, the third axle swing arm; The hinge-point of three longitudinal ties and each swing arm all is positioned at the centre of gration top of each swing arm.

Beneficial effect: this three preceding axle steering system, be suitable for third axle and be arranged near rear driving axle fwd system, realized the active steering of third axle.Three longitudinal ties with respectively turn to the swing arm hinge-point all above centre of gration, avoided longitudinal tie and chassis member such as bumper, fuel tank layout interference problem.Double-acting piston power-assisted oil cylinder is installed in the second bridge swing arm additional, plays the effect of power steering.By increasing the transition swing arm, make that longitudinal tie is divided into two sections between second bridge and the third axle, avoided the long insufficient rigidity problem that causes of pull bar.By increasing the transition swing arm, guaranteeing that each swing arm deflection angle concerns under the unmodified prerequisite, reduce going up of third axle swing arm and saved arm lengths.

Description of drawings

Fig. 1 is that the structure master of three preceding axle steering systems looks scheme drawing.

The specific embodiment

Shown in Figure 1,1 is the first bridge swing arm, and 2 is first longitudinal ties, and 3 is second bridge swing arms, the 4th, and the power-assisted oil cylinder, 5 is second longitudinal ties, the 6th, the transition swing arm, 7 is the 3rd longitudinal ties, the 8th, the third axle swing arm.

Three preceding axle steering systems as shown in Figure 1, comprise the first bridge swing arm 1, the second bridge swing arm 3, third axle swing arm 8, the first bridge swing arm 1, the second bridge swing arm 3 connect by first longitudinal tie 2, the second bridge swing arm 3 adds double-acting piston power-assisted oil cylinder 4, and power-assisted oil cylinder 4 oil circuits are in parallel with the power steering oil circuit; Have between transition swing arm 6, the second bridge swing arms 3, transition swing arm 6, the third axle swing arm 8 successively by second longitudinal tie 5,7 connections of the 3rd longitudinal tie in increase between the second bridge swing arm 3 and the third axle swing arm 8; The hinge-point of three longitudinal ties (first longitudinal tie 2, second longitudinal tie 5, the 3rd longitudinal tie 7) and each swing arm all is positioned at the centre of gration top of each swing arm.

Claims

1. axle steering systems before three, comprise the first bridge swing arm, the second bridge swing arm, third axle swing arm, longitudinal tie, the first bridge swing arm, the second bridge swing arm connect by longitudinal tie, it is characterized in that: the second bridge swing arm adds double-acting piston power-assisted oil cylinder, and power-assisted oil cylinder oil circuit is in parallel with the power steering oil circuit; Increasing between the second bridge swing arm and third axle swing arm has the transition swing arm, connects by longitudinal tie successively between the second bridge swing arm, transition swing arm, the third axle swing arm; The hinge-point of three longitudinal ties and each swing arm all is positioned at the centre of gration top of each swing arm.