Fully hydraulic steering system for articulated two-way driving vehicles

Abstract

The invention belongs to the technical field of engineering vehicles, and specifically relates to a fully hydraulic steering system for an articulated two-way driving vehicle, which solves the problems existing in the steering system of an existing articulated two-way driving vehicle, including front and rear driving switching valve groups, front and rear priority valves, Front and rear load sensing steering gears, front and rear steering lock valves, left and right steering oil cylinders, front and rear steering lock valves are air-controlled two-position six-way reversing valves, and the front and rear load sensing steering gears have a total of four working oil ports respectively. Connect the four oil ports of the front and rear steering lock valves. The invention adopts an air-controlled two-position six-way reversing valve between the front load sensing steering gear and the rear load sensing steering gear of the articulated two-way driving vehicle, which realizes the real locking between the front and rear steering systems and avoids The mutual interference between the front and rear steering systems ensures the steering performance of the vehicle. On the articulated two-way driving vehicle, the front and rear driving switching valve group is adopted to realize the switching of the front and rear driving controls.

Description

technical field [0001] The invention belongs to the technical field of engineering vehicles, and in particular relates to a fully hydraulic steering system for an articulated two-way driving vehicle. Background technique [0002] Articulated two-way driving vehicles are mainly used in places where space is limited, such as mine tunnels and long tunnels. In these places, not only the steering system is required to be easy to operate and the turning radius is small, but also the steering system arranged in the front and rear cabs is required to be able to realize locking. Function. [0003] There are two main types of articulated two-way driving vehicle steering system in the prior art, one principle is as follows: figure 1 As shown, when the driver operates the front steering gear 10 arranged in the front cab, the R port of the front steering gear 10 communicates with the rodless chamber of the left steering cylinder 7 and the rod chamber of the right steering cylinder 8, an...

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Problems solved by technology

[0003] There are two main types of articulated two-way driving vehicle steering system in the prior art, one principle is as follows: figure 1 As shown, when the driver operates the front steering gear 10 arranged in the front cab, the R port of the front steering gear 10 communicates with the rodless chamber of the left steering cylinder 7 and the rod chamber of the right steering cylinder 8, and the front steering gear 10 The L port of the front steering gear 10 is connected to the rod chamber of the left steering cylinder 7 and the rodless chamber of the right steering cylinder 8 to realize the articulated steering of the vehicle. In this process, the R port and the L port of the front steering gear 10 are connected with the The L port and the R port of the rear steering gear 11 of the cab are always in a connected state. If the person sitting in the rear cab causes the rear steering gear 11 to move intentionally or unintentionally at this time, the whole vehicle will not be able to turn or turn. The phenomenon that the state cannot be controlled increases the probability of accidents; when the driver operates the rear steering gear 11, the principle is also the same

[0004] Another principle such as figure 2 As shown, if the front and rear steering gears are operated at the same time, the vehicle cannot be turned or the steering state cannot be controlled; in addition, since the oil return port T of the front steering gear 10 is connected to the oil inlet P of the rear steering gear 11 , if the vehicle is driven in the rear cab, the oil return port T of the front steering gear 10 will be in a high-pressure state for a long time, which will cause frequent damage to the front steering gear 10

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