Full-hydraulic steering gear with low steering torque

Abstract

The utility model discloses a full-hydraulic steering gear with low steering torque, which comprises a valve sleeve body, a shifting pin hole and a valve core body, the valve core body is arranged in the valve sleeve body, a spring piece is arranged in the valve core body, the shifting pin hole is arranged in the valve sleeve body, a shifting pin is arranged on one side of the valve sleeve body, and the shifting pin hole is arranged on the other side of the valve sleeve body. A first reinforcing layer is arranged on the inner wall of the valve sleeve body, a second reinforcing layer is arranged on the inner wall of the first reinforcing layer, a wear-resistant coating is arranged on the outer wall of the second reinforcing layer, and the device has the advantages that carbonitriding is adopted for the coating at the second reinforcing layer, so that the hardness, the wear resistance and the fatigue strength of steel are mainly improved; the main purpose of the utility model is to improve the wear resistance and seizure resistance of steel. And reinforcing ribs are additionally arranged on the second reinforcing layer, so that the strength of the valve sleeve body is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of full hydraulic steering gears, in particular to a low steering torque full hydraulic steering gear. Background Art

[0002] Fully hydraulic steering gear is widely used in vehicle steering and ship hydraulic rudder. It allows drivers to achieve greater steering force control with less operating force, and is safe, reliable, flexible and light in operation. The steering gear is a rotary valve type fully hydraulic steering gear with the following characteristics: eliminating mechanical linkage devices, which can reduce the cost of the main engine, providing a reliable and light structure, flexible and light in operation, safe and reliable, continuous stepless control rotation with very small torque, providing a wide range of options for control circuits and main engine sizes, and can be connected to a variety of steering oil pumps and hydraulic supply systems.

[0003] A low-noise full-hydraulic steering gear with application publication number: CN106585710A is compared. The low-noise full-hydraulic steering gear comprises a valve sleeve and a valve core. The valve core is movably arranged in the valve sleeve. The valve core comprises a cylindrical core barrel. A groove array composed of grooves is provided on the circumference of the bottom of the core barrel. The valve sleeve comprises a cylindrical sleeve. An oil inlet hole array composed of oil inlet holes is provided on the circumference of the lower part of the sleeve. A noise reduction slope is provided on both sides of the outer wall of the groove. Since a noise reduction slope is provided on both sides of the outer wall of the groove, the groove and the oil inlet hole will not be closed immediately when the valve core rotates, but will pass through a transition section, which effectively reduces the hydraulic noise of the steering gear when turning, effectively expands the deflection angle between the opening and closing of the valve sleeve and the valve core, effectively reduces the shaking of the vehicle when starting and stopping the steering, improves the comfort of the vehicle operation, and has strong practicality.

[0004] However, the low steering torque fully hydraulic steering gear has the following problems during use: when the traditional fully hydraulic steering gear is in use, when the steering gear is not working, the hydraulic oil is turned off, the steering gear inlet has a high pressure, the strength is not high, it is easy to be damaged, and it is corroded by the solution for a long time, and it is damaged and needs to be replaced. Utility Model Content

[0005] The utility model aims to provide a low steering torque full hydraulic steering gear to solve the related problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a low steering torque fully hydraulic steering gear, comprising a valve sleeve body, a pin hole and a valve core body, a valve core body is arranged inside the valve sleeve body, and a spring sheet is arranged inside the valve core body, a pin hole is opened inside the valve sleeve body, a pin is arranged on one side of the valve sleeve body, a first reinforcement layer is arranged on the inner wall of the valve sleeve body, a second reinforcement layer is arranged on the inner wall of the first reinforcement layer, and a wear-resistant coating is arranged on the outer wall of the second reinforcement layer.

[0007] The technical solution provides a low steering torque fully hydraulic steering gear, wherein the first reinforcement layer is provided with H-shaped reinforcement ribs inside.

[0008] The technical solution provides a low steering torque fully hydraulic steering gear, wherein the thickness of the spring sheet is 0.4 mm and the height is 4.2 mm.

[0009] The technical solution provides a low steering torque fully hydraulic steering gear, wherein the spring sheet force is 50 Nm when it is compressed to 1.5 mm.

[0010] The technical solution provides a low steering torque fully hydraulic steering gear, wherein 45 steel is arranged inside the second reinforcement layer.

[0011] Compared with the prior art, the utility model provides a low steering torque full hydraulic steering gear, which has the following beneficial effects:

[0012] 1. The utility model allows the operator to install two spring sheets back to back between the valve core body and the push pin. The steering torque is 0.8-1.2 Nm during steering, so that the operator has a light steering torque during driving, no fatigue, comfortable feel, and is suitable for long-term operation.

[0013] 2. The utility model adopts carbonitriding through the coating at the second reinforcement layer. Carbonitriding is the process of simultaneously infiltrating carbon and nitrogen into the surface layer of steel. Currently, medium-temperature gas carbonitriding and low-temperature gas nitrocarburizing are widely used. The main purpose of medium-temperature gas carbonitriding is to improve the hardness, wear resistance and fatigue strength of steel. The main purpose is to improve the wear resistance and anti-seizure of steel. By adding reinforcing ribs at the second reinforcement layer, the strength of the valve sleeve body is further increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0015] Figure 2 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0016] Figure 3 For the utility model Figure 1 A schematic diagram of the enlarged structure at point A;

[0017] Figure 4 It is a schematic diagram of the three-dimensional assembly structure of the utility model.

[0018] In the figure: 1. valve sleeve body; 2. push pin hole; 3. valve core body; 4. push pin; 5. spring sheet; 6. second reinforcement layer; 7. first reinforcement layer; 8. wear-resistant coating; 9. 45 steel; 10. reinforcement rib. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] Embodiment 1, as Figure 1-2 As shown, the utility model provides a technical solution: a low steering torque fully hydraulic steering gear, comprising a valve sleeve body 1, a pin hole 2 and a valve core body 3, the valve sleeve body 1 is provided with a valve core body 3, and the valve core body 3 is provided with a spring sheet 5, the spring sheet 5 model is 1Gr17N7 spring bent sheet, the thickness of the spring sheet 5 is 0.4mm, the height is 4.2mm, the spring sheet 5 is 50Nm when pressed to 1.5mm, two spring sheets 5 are installed back to back between the valve core body 3 and the pin 4, the steering torque is 0.8-1.2Nm during steering, so that the operator has a light steering torque during driving, no fatigue, comfortable feel, and is suitable for long-term operation.

[0021] Embodiment 2, as Figure 1-4 As shown, the utility model provides a technical solution: a low steering torque full hydraulic steering gear, comprising a valve sleeve body 1 with a pin hole 2 opened inside, a pin 4 arranged on one side of the valve sleeve body 1, a second reinforcement layer 6 arranged on the inner wall of the valve sleeve body 1, a first reinforcement layer 7 arranged on the inner wall of the second reinforcement layer 6, a wear-resistant coating 8 arranged on the outer wall of the first reinforcement layer 7, an H-shaped reinforcement rib 10 arranged inside the first reinforcement layer 7, the wear-resistant coating 8 is made of phenolic epoxy paint, and the reinforcement rib 10 is added at the first reinforcement layer 7 to further increase the strength of the valve sleeve body 1, and 45 steel 9 is used at the second reinforcement layer 6, a coating is arranged on the outer wall of the first reinforcement layer 7, and the coating at the first reinforcement layer 7 adopts carbonitriding, carbonitriding is the process of simultaneously infiltrating carbon and nitrogen into the surface layer of steel. At present, medium-temperature gas carbonitriding and low-temperature gas nitrocarburizing are widely used. Medium-temperature gas carbonitriding mainly aims to improve the hardness, wear resistance and fatigue strength of steel, and its main purpose is to improve the wear resistance and anti-seizure property of steel.

[0022] Working principle: First, the operator can install the two spring leaves 5 back to back between the valve core body 3 and the pin 4. The steering torque is 0.8-1.2 Nm during steering, so that the operator has a light steering torque during driving, without fatigue, and a comfortable feel, which is suitable for long-term operation. The first reinforcement layer uses 45 steel 9, and a coating is provided on the outer wall of the first reinforcement layer 7. The coating of the first reinforcement layer 7 adopts carbonitriding. Carbonitriding is the process of simultaneously infiltrating carbon and nitrogen into the surface of steel. At present, medium-temperature gas carbonitriding and low-temperature gas nitrocarburizing are widely used. The main purpose of medium-temperature gas carbonitriding is to improve the hardness, wear resistance and fatigue strength of steel. Its main purpose is to improve the wear resistance and bite resistance of steel, increase strength and corrosion resistance, and increase reinforcing ribs 10 at the first reinforcement layer 7 to further increase the strength of the valve sleeve body 1.

[0023] Finally, it should be noted that the above content is only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Simple modifications or equivalent substitutions of the technical solution of the utility model by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the utility model.

Claims

1. A low steering torque fully hydraulic steering gear, comprising a valve sleeve body (1), a pin hole (2) and a valve core body (3), characterized in that: A valve core body (3) is arranged inside the valve sleeve body (1), and a spring sheet (5) is arranged inside the valve core body (3); a pinning hole (2) is opened inside the valve sleeve body (1); a pinning (4) is arranged on one side of the valve sleeve body (1); a first reinforcement layer (7) is arranged on the inner wall of the valve sleeve body (1), and a second reinforcement layer (6) is arranged on the inner wall of the first reinforcement layer (7); and a wear-resistant coating (8) is arranged on the outer wall of the second reinforcement layer (6).

2. A low steering torque fully hydraulic steering gear according to claim 1, characterized in that: H-shaped reinforcing ribs (10) are arranged inside the first reinforcing layer (7).

3. The low steering torque fully hydraulic steering gear according to claim 1, characterized in that: The spring sheet (5) has a thickness of 0.4 mm and a height of 4.2 mm.

4. The low steering torque fully hydraulic steering gear according to claim 1, characterized in that: The spring sheet (5) is compressed to 50 Nm when the force reaches 1.5 mm.

5. The low steering torque fully hydraulic steering gear according to claim 1, characterized in that: 45 steel (9) is arranged inside the second reinforcement layer (6).

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