Centering valve structure of circulating ball power steering gear

Abstract

The utility model discloses a circulating ball power steering gear centering valve structure which comprises a shell and a steering nut, the steering nut is located in the shell, a screw plug and a centering valve seat are installed on the bottom end side of the shell, a sliding rod capable of sliding up and down is placed in the centering valve seat, a spring is placed in the screw plug, and the sliding rod can slide up and down in the sliding rod. One end of the spring abuts against the bottom end of the inner side of the screw plug, the other end of the spring abuts against the bottom end side of the sliding rod, the side face of the bottom end of the steering nut protrudes outwards to form a flange, and the top end of the sliding rod abuts against the side face of the bottom end of the steering nut. According to the utility model, when a vehicle runs at a high speed, direction deviation caused by external disturbance of the vehicle is avoided, so that the vehicle has good operation stability performance.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic steering systems, in particular to a centering valve structure of a circulating ball power steering device, which is used for the control feeling of a steering wheel of an automobile. Background Art

[0002] Handling stability is one of the important performance characteristics of a car, which represents the maneuverability of the car and its ability to resist external interference. Therefore, a car should have good handling stability. The steering system that controls the direction of the car is most closely related to the handling stability of the car. How to design the power steering system of a car so that the car has good handling stability has always been an important research topic for car manufacturers and scientific research institutions.

[0003] The handling stability of a car is the main performance indicator of the car. It refers to the ability of the car to follow the direction given by the driver through the steering system and the steering wheel under the condition that the driver does not feel overly nervous or tired, and when encountering external interference, the car can resist interference and maintain stable driving. It is generally considered to be composed of two interrelated parts: one is maneuverability, and the other is stability. Maneuverability refers to the ability of the car to accurately respond to the driver's steering instructions; stability refers to the ability of the car to restore its original state of motion after being disturbed by external factors, such as road disturbances or sudden gusts of wind. The two are difficult to separate. The quality of stability directly affects the quality of maneuverability, so it is usually collectively referred to as handling stability. Therefore, there is a need on the market for a recirculating ball power steering gear or related structure that has the advantages of both. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a centering valve structure of a recirculating ball power steering gear, which can prevent the direction of the vehicle from being deviated due to external disturbance when the vehicle is running at high speed, and has good control stability performance.

[0005] In order to solve the above problems, the utility model adopts the following technical solutions:

[0006] A centering valve structure for a recirculating ball power steering gear comprises a shell and a steering nut, wherein the steering nut is located in the shell, a screw plug and a centering valve seat are installed on the bottom end side of the shell, a sliding rod that can slide up and down is placed in the centering valve seat, a spring is placed in the screw plug, one end of the spring abuts against the bottom end of the inner side of the screw plug, and the other end abuts against the bottom end side of the sliding rod, the bottom end side surface of the steering nut protrudes outward to form a flange, and the top end of the sliding rod abuts against the bottom end side surface of the steering nut.

[0007] A further technical solution is that the centering valve seat is fixed on the shell, and the screw plug is threadedly connected to the shell and is located below the centering valve seat. The screw plug is removable for easy installation and replacement, and the centering valve seat limits the deflection of the sliding rod, making its up and down sliding more stable.

[0008] A further technical solution is that an O-ring is built into the outer circumference of the screw plug to achieve a good sealing effect and prevent oil and dust.

[0009] A further technical solution is that the diameter of the upper end of the sliding rod is smaller than the diameter of the bottom of the lower end, which limits the sliding rod from being pushed out of the centering valve seat due to the spring and limits the displacement distance of the sliding rod. The diameter of the bottom end of the sliding rod is larger than the inner hole diameter of the centering valve seat.

[0010] The beneficial effects of the utility model are as follows: the utility model is a centering valve structure of a recirculating ball power steering gear, in which a screw plug, a spring, a sliding rod and a centering valve seat are installed on a housing and a steering nut of the steering gear, and the sliding rod which can slide up and down on the housing contacts with a flange on the steering nut, so that when the vehicle is running at high speed, the direction will not be deviated due to external disturbances of the vehicle, so that the vehicle has good handling stability performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 This is a structural schematic diagram of a centering valve structure of a recirculating ball power steering gear of the utility model;

[0013] Figure 2 It is a schematic diagram of a steering nut in a centering valve structure of a recirculating ball power steering device of the utility model;

[0014] Figure 3 It is a schematic diagram of a performance curve of a recirculating ball power steering gear with a centering valve structure according to the utility model;

[0015] Figure 4 The utility model is a schematic diagram of a centering valve structure of a recirculating ball power steering gear installed on a steering gear.

[0016] Figure 1-4 Middle: 1-housing, 2-upper chamber of master cylinder, 3-screw plug, 4-spring, 5-slide rod, 6-centering valve seat, 7-O-ring, 8-steering nut, 9-lower chamber of master cylinder, 10-flange. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0018] See also Figures 1 to 4 As shown, a centering valve structure of a recirculating ball power steering gear includes a housing 1 and a steering nut 8. The steering nut 8 is located in the housing 1. A screw plug 3 and a centering valve seat 6 are installed on the bottom end side of the housing 1. A sliding rod 5 that can slide up and down is placed in the centering valve seat 6. A spring 4 is placed in the screw plug 3. One end of the spring 4 abuts against the bottom end of the inner side of the screw plug 3, and the other end abuts against the bottom end side of the sliding rod 5. The bottom end side surface of the steering nut 8 protrudes outward to form a flange 10, and the top end of the sliding rod 5 abuts against the bottom end side surface of the steering nut 8.

[0019] The centering valve seat 6 is fixed on the housing 1, and the screw plug 3 is threadedly connected to the housing 1 and is located below the centering valve seat 6. The screw plug 3 is detachable for easy installation and replacement, and the centering valve seat 6 limits the deflection of the slide bar 5, making it more stable when sliding up and down. An O-ring 7 is also built into the outer circumference of the screw plug 3, which has a good sealing effect and is oil-proof and dust-proof. The diameter of the upper end of the slide bar 5 is smaller than the diameter of the bottom of the lower end, which limits the slide bar 5 from being pushed out of the centering valve seat 6 due to the spring 4, and limits the displacement distance of the slide bar 5. The diameter of the bottom end of the slide bar 5 is larger than the inner hole diameter of the centering valve seat 6.

[0020] In this embodiment, the steering nut 8 is located between the upper chamber 2 of the master cylinder and the lower chamber 9 of the master cylinder in the housing 1. Figure 1 and Figure 4 As shown, during installation, the order of installing into the housing 1 is: centering valve seat 6, slide rod 5, spring 4, screw plug 3, and the O-ring 7 must be fixed on the screw plug 3 before it can be installed into the housing 1. When the steering nut 8 is located in the middle position between the upper chamber 2 of the master cylinder and the lower chamber 9 of the master cylinder, the slide rod 5 contacts the flange 10 on the side of the bottom end of the steering nut 8 due to the action of the spring 4. At this time, the vehicle has better handling stability during driving. This area is a bulging area, and the steering gear performance curve is bulging, such as Figure 3 As shown, it is a schematic diagram of the curve between the input torque and the input angle, and the middle is the interval where the curve shows a bulge type. When the steering nut 8 moves left and right, the spring 4 in the housing 1 does not work, and the top end of the slide rod 5 does not contact the bottom end surface of the steering nut 8, so that the bulge type of the steering gear performance curve disappears. At this time, the vehicle has good steering performance when driving. When the car is driving on the highway, the steering wheel angle is not too large, the lateral acceleration is small, and it has good enough handling stability in the bulge type area.

[0021] The above is only a specific implementation of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included in the protection scope of the present utility model.

Claims

1. A centering valve structure of a recirculating ball power steering gear, comprising a housing and a steering nut, characterized in that: The steering nut is located in a shell, and a screw plug and a centering valve seat are installed on the bottom side of the shell. A sliding rod that can slide up and down is placed in the centering valve seat, and a spring is placed in the screw plug. One end of the spring abuts against the bottom end of the inner side of the screw plug, and the other end abuts against the bottom end of the sliding rod. The bottom end side of the steering nut protrudes outward to form a flange, and the top end of the sliding rod abuts against the bottom end side of the steering nut.

2. A centering valve structure for a recirculating ball power steering gear according to claim 1, characterized in that: The centering valve seat is fixed on the shell, and the screw plug is threadedly connected to the shell and is located below the centering valve seat.

3. A centering valve structure for a recirculating ball power steering gear according to claim 1, characterized in that: An O-ring is also built-in on the outer circumference of the screw plug.

4. A centering valve structure for a recirculating ball power steering gear according to claim 1, characterized in that: The diameter of the upper end of the sliding rod is smaller than the diameter of the bottom of the lower end.

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