Steering system of articulated tractor

Abstract

The utility model discloses a steering system of an articulated tractor. The steering system comprises a hydraulic oil tank, a constant flow pump, a steering gear, a middle left steering oil cylinder, a middle right steering oil cylinder, an electromagnetic valve and a front wheel steering oil cylinder, a constant-flow pump oil inlet pipe is arranged between the hydraulic oil tank and the constant-flow pump, an oil return pipe is arranged between the hydraulic oil tank and the steering gear, a high-pressure oil supply pipe is arranged between the constant-flow pump and the steering gear, and a left steering oil pipe and a right steering oil pipe are arranged between the steering gear and the electromagnetic valve. A front axle left steering oil pipe and a front axle right steering oil pipe are arranged between the electromagnetic valve and the front wheel steering oil cylinder, a middle left steering oil pipe is arranged between the electromagnetic valve and the middle left steering oil cylinder, and a middle right steering oil pipe is arranged between the electromagnetic valve and the middle right steering oil cylinder; a steering change-over switch is arranged on an instrument shell of the tractor. By pressing the steering change-over switch, the steering mechanism achieves the purpose of firstly steering the front wheel and then steering the middle part.

Description

Technical Field

[0001] The utility model relates to the technical field of tractors, and more specifically, to a steering system for an articulated tractor. Background Art

[0002] Tractors are divided into direct-connected tractors and articulated tractors. The direct-connected tractors usually adopt front-wheel steering, and the front axle is installed at the lower part in front of the engine. The disadvantage is that the distance between the front axle and the rear axle is far, and the turning radius is large. For example, the headland turning that a direct-connected tractor needs to perform 2 - 3 times of backing up to achieve. The articulated tractor has a front-wheel steering mechanism and an intermediate steering mechanism. When steering, it first steers the front wheels and then steers the intermediate part to reduce the turning radius of the tractor. However, how to achieve steering the front wheels first and then the intermediate part is an urgent problem to be solved. Summary of the Utility Model

[0003] Aiming at the above deficiencies, the technical problem to be solved by the utility model is: to provide a steering system for an articulated tractor, which can achieve steering the front wheels first and then the intermediate part, and reduce the turning radius of the tractor.

[0004] To solve the above technical problems, the technical solution of the utility model is:

[0005] A steering system for an articulated tractor, comprising: a hydraulic oil tank, a constant flow pump, a steering gear, an intermediate left steering cylinder, an intermediate right steering cylinder, a solenoid valve, and a front-wheel steering cylinder;

[0006] A constant flow pump inlet pipe is provided between the hydraulic oil tank and the constant flow pump, a return pipe is provided between the hydraulic oil tank and the steering gear, a high-pressure oil supply pipe is provided between the constant flow pump and the steering gear, a left steering pipe and a right steering pipe are provided between the steering gear and the solenoid valve, a front axle left steering pipe and a front axle right steering pipe are provided between the solenoid valve and the front-wheel steering cylinder, an intermediate left steering pipe is provided between the solenoid valve and the intermediate left steering cylinder, and an intermediate right steering pipe is provided between the solenoid valve and the intermediate right steering cylinder;

[0007] A steering conversion switch for controlling the solenoid valve to perform first-level front-wheel steering or second-level intermediate steering is provided on the instrument housing of the tractor.

[0008] Preferably, the return pipe includes a steering gear return steel pipe and a fuel tank return pipe which are connected and communicated. The steering gear return steel pipe is communicated with the steering gear, and the fuel tank return pipe is communicated with the hydraulic oil tank.

[0009] Preferably, the high-pressure oil supply pipe includes a constant oil pump high-pressure pipe and a steering gear inlet steel pipe which are connected and communicated. The constant oil pump high-pressure pipe is communicated with the constant oil pump, and the steering gear inlet steel pipe is communicated with the steering gear.

[0010] Preferably, the left steering oil pipe includes a left steering gear steel pipe and a left steering solenoid valve oil pipe that are connected and communicate with each other. The left steering gear steel pipe communicates with the steering gear, and the left steering solenoid valve oil pipe communicates with the solenoid valve.

[0011] Preferably, the right steering oil pipe includes a right steering gear steel pipe and a right steering solenoid valve oil pipe that are connected and communicate with each other. The right steering gear steel pipe communicates with the steering gear, and the right steering solenoid valve oil pipe communicates with the solenoid valve.

[0012] Preferably, the intermediate left steering cylinder is a single-acting cylinder, and the intermediate left steering oil pipe communicates with the rodless cavity of the intermediate left steering cylinder.

[0013] Preferably, the intermediate right steering cylinder is a single-acting cylinder, and the intermediate right steering oil pipe communicates with the rodless cavity of the intermediate right steering cylinder.

[0014] After adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0015] By adding a steering conversion switch on the instrument housing, when the steering conversion switch is in the first-level steering position, turning the steering wheel realizes the first-level front-wheel steering; when the steering conversion switch is in the second-level steering position, the solenoid valve acts, and turning the steering wheel performs the second-level intermediate steering. When the tractor steers, it first performs the first-level front-wheel steering and then the second-level intermediate steering, realizing the secondary steering of the tractor and achieving the purpose of reducing the turning radius of the tractor. Description of the Drawings

[0016] Figure 1 is a schematic diagram of the principle of the articulated tractor steering system of the present invention;

[0017] In the figure: 1, hydraulic oil tank; 2, constant flow pump; 3, steering gear; 4, intermediate left steering cylinder; 5, intermediate right steering cylinder; 6, solenoid valve; 7, front axle; 8, constant flow pump inlet oil pipe; 9, left steering gear steel pipe; 10, left steering solenoid valve oil pipe; 11, front axle left steering oil pipe; 12, front axle right steering oil pipe; 13, intermediate left steering oil pipe; 14, intermediate right steering oil pipe; 15, steering gear return oil steel pipe; 16, oil tank return oil pipe; 17, constant oil pump high-pressure oil pipe; 18, steering gear inlet oil steel pipe; 19, right steering gear steel pipe; 20, right steering solenoid valve oil pipe. Detailed Embodiments

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] As shown Figure 1 in the figure, an articulated tractor steering system includes: a hydraulic oil tank 1, a constant flow pump 2, a steering gear 3, a middle left steering cylinder 4, a middle right steering cylinder 5, a solenoid valve 6, and front wheel steering cylinders, and the front wheel steering cylinders are installed on a front axle 7.

[0020] A constant flow pump inlet pipe 8 is provided between the hydraulic oil tank 1 and the constant flow pump 2, a return pipe is provided between the hydraulic oil tank 1 and the steering gear 3, a high-pressure oil supply pipe is provided between the constant flow pump 2 and the steering gear 3, a left steering pipe and a right steering pipe are provided between the steering gear 3 and the solenoid valve 6, a front axle left steering pipe 11 and a front axle right steering pipe 12 are provided between the solenoid valve 6 and the front wheel steering cylinders, a middle left steering pipe 13 is provided between the solenoid valve 6 and the middle left steering cylinder 4, and a middle right steering pipe 14 is provided between the solenoid valve 6 and the middle right steering cylinder 5.

[0021] A steering conversion switch is provided on the instrument housing of the tractor. When the steering conversion switch is in the first-level steering position, turning the steering wheel realizes front wheel steering; when the steering conversion switch is in the second-level steering position, the solenoid valve 6 acts, and turning the steering wheel performs second-level middle steering. When the tractor steers, it first performs first-level front wheel steering and then second-level middle steering, realizing the secondary steering of the tractor and achieving the purpose of reducing the turning radius of the tractor.

[0022] The return pipe includes a steering gear return steel pipe 15 and a fuel tank return pipe 16 that are connected and communicated. The steering gear return steel pipe 15 is communicated with the steering gear 3, and the fuel tank return pipe 16 is communicated with the hydraulic oil tank 1.

[0023] The high-pressure oil supply pipe includes a constant oil pump high-pressure pipe 17 and a steering gear inlet steel pipe 18 that are connected and communicated. The constant oil pump high-pressure pipe 17 is communicated with the constant flow pump 2, and the steering gear inlet steel pipe 18 is communicated with the steering gear 3.

[0024] The left steering pipe includes a left steering steering gear steel pipe 9 and a left steering solenoid valve pipe 10 that are connected and communicated. The left steering steering gear steel pipe 9 is communicated with the steering gear 3, and the left steering solenoid valve pipe 10 is communicated with the solenoid valve 6.

[0025] The right steering pipe includes a right steering steering gear steel pipe 19 and a right steering solenoid valve pipe 20 that are connected and communicated. The right steering steering gear steel pipe 19 is communicated with the steering gear 3, and the right steering solenoid valve pipe 20 is communicated with the solenoid valve 6.

[0026] In this embodiment, both the middle left steering cylinder 4 and the middle right steering cylinder 5 are single-acting cylinders. The middle left steering pipe 13 is communicated with the rodless cavity of the middle left steering cylinder 4, and the middle right steering pipe 14 is communicated with the rodless cavity of the middle right steering cylinder 5.

[0027] Principle of front axle left steering:

[0028] The oil drainage flow direction is as follows: hydraulic oil tank 1 - constant flow pump inlet pipe 8 - constant flow pump 2 - constant oil pump high-pressure pipe 17 - steering gear inlet steel pipe 18 - steering gear 3 - left steering gear steel pipe 9 - left steering solenoid valve oil pipe 10 - solenoid valve 6 - front axle left steering oil pipe 11 - front wheel steering cylinder. The front wheel steering cylinder drives the front wheels on both sides to move to achieve the left turn of the tractor.

[0029] The oil return flow direction is as follows: front wheel steering cylinder - front axle right steering oil pipe 12 - solenoid valve 6 - right steering solenoid valve oil pipe 20 - right steering gear steel pipe 19 - steering gear 3 - oil tank return pipe 16 - hydraulic oil tank 1.

[0030] Principle of right turn of the front axle:

[0031] The oil drainage flow direction is as follows: hydraulic oil tank 1 - constant flow pump inlet pipe 8 - constant flow pump 2 - constant oil pump high-pressure pipe 17 - steering gear 3 - right steering gear steel pipe 19 - right steering solenoid valve oil pipe 20 - solenoid valve 6 - front axle right steering oil pipe 12 - front wheel steering cylinder. The front wheel steering cylinder drives the front wheels on both sides to move to achieve the right turn of the tractor.

[0032] The oil return flow direction is as follows: front wheel steering cylinder - front axle left steering oil pipe 11 - solenoid valve 6 - left steering solenoid valve oil pipe 10 - left steering gear steel pipe 9 - steering gear 3 - oil tank return pipe 16 - hydraulic oil tank 1.

[0033] Principle of left turn in the middle:

[0034] While the middle right steering cylinder 5 extends, the middle left steering cylinder 4 retracts, driving the middle steering mechanism to move to achieve the middle right turn;

[0035] The oil drainage flow direction is as follows: hydraulic oil tank 1 - constant flow pump inlet pipe 8 - constant flow pump 2 - constant oil pump high-pressure pipe 17 - steering gear 3 - right steering gear steel pipe 19 - right steering solenoid valve oil pipe 20 - solenoid valve 6 - middle right steering oil pipe 14 - middle right steering cylinder 5;

[0036] The oil return flow direction is as follows: middle left steering cylinder 4 - middle left steering oil pipe 13 - solenoid valve 6 - left steering solenoid valve oil pipe 10 - left steering gear steel pipe 9 - steering gear 3 - oil tank return pipe 16 - hydraulic oil tank 1.

[0037] Principle of right turn in the middle:

[0038] While the middle left steering cylinder 4 extends, the middle right steering cylinder 5 retracts, driving the middle steering mechanism to move to achieve the middle left turn;

[0039] The oil drainage flow direction is as follows: hydraulic oil tank 1 - constant flow pump inlet pipe 8 - constant flow pump 2 - constant oil pump high-pressure pipe 17 - steering gear 3 - left steering gear steel pipe 9 - left steering solenoid valve oil pipe 10 - solenoid valve 6 - middle left steering oil pipe 13 - middle left steering cylinder 4;

[0040] The oil return flow direction is as follows: middle right steering cylinder 5 - middle right steering oil pipe 14 - solenoid valve 6 - right steering solenoid valve oil pipe 20 - right steering steering gear steel pipe 19 - steering gear 3 - oil tank return pipe 16 - hydraulic oil tank 1. The above is an example of the best implementation mode of the present invention, and the parts not described in detail are all common general knowledge of those of ordinary skill in the art. The protection scope of the present invention is subject to the content of the claims, and any equivalent transformation based on the technical inspiration of the present invention is also within the protection scope of the present invention.

Claims

1. An articulated tractor steering system, characterized in that, Comprising: A hydraulic oil tank, a constant flow pump, a steering gear, a middle left steering cylinder, a middle right steering cylinder, a solenoid valve and a front wheel steering cylinder; A constant flow pump inlet pipe is provided between the hydraulic oil tank and the constant flow pump, a return pipe is provided between the hydraulic oil tank and the steering gear, a high-pressure oil supply pipe is provided between the constant flow pump and the steering gear, a left steering pipe and a right steering pipe are provided between the steering gear and the solenoid valve, a front axle left steering pipe and a front axle right steering pipe are provided between the solenoid valve and the front wheel steering cylinder, a middle left steering pipe is provided between the solenoid valve and the middle left steering cylinder, and a middle right steering pipe is provided between the solenoid valve and the middle right steering cylinder; A steering conversion switch for controlling the action of the solenoid valve to perform primary front wheel steering or secondary middle steering is provided on the instrument housing of the tractor.

2. The articulated tractor steering system according to claim 1, wherein, The return pipe includes a steering gear return steel pipe and a tank return pipe that are connected and communicate with each other. The steering gear return steel pipe is connected to the steering gear, and the tank return pipe is connected to the hydraulic oil tank.

3. The articulated tractor steering system according to claim 1, characterized in that, The high-pressure oil supply pipe includes a constant oil pump high-pressure pipe and a steering gear inlet steel pipe that are connected and communicate with each other. The constant oil pump high-pressure pipe is connected to the constant oil pump, and the steering gear inlet steel pipe is connected to the steering gear.

4. The articulated tractor steering system according to claim 1, wherein The left steering pipe includes a left steering steering gear steel pipe and a left steering solenoid valve pipe that are connected and communicate with each other. The left steering steering gear steel pipe is connected to the steering gear, and the left steering solenoid valve pipe is connected to the solenoid valve.

5. The articulated tractor steering system according to claim 1, characterized in that, The right steering pipe includes a right steering steering gear steel pipe and a right steering solenoid valve pipe that are connected and communicate with each other. The right steering steering gear steel pipe is connected to the steering gear, and the right steering solenoid valve pipe is connected to the solenoid valve.

6. The articulated tractor steering system according to claim 1, wherein The middle left steering cylinder is a single-acting cylinder, and the middle left steering pipe is connected to the rodless cavity of the middle left steering cylinder.

7. The articulated tractor steering system according to claim 1, characterized in that, The middle right steering cylinder is a single-acting cylinder, and the middle right steering pipe is connected to the rodless cavity of the middle right steering cylinder.

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