Power steering device for improving steering wheel stability

Abstract

The present invention discloses a power steering device for improving the stability of a steering wheel, which belongs to the field of motor vehicle applications and comprises: a screw shaft, a moving block is arranged on the threaded section of the screw shaft, a tooth groove is arranged at the front end of the moving block, a steering shaft is arranged at the front end of the tooth groove, a gear ring is sleeved on the steering shaft, and the outer teeth of the gear ring mesh with the tooth groove of the moving block for transmission; an eddy current damper is arranged at the rear end of the moving block, a conductor layer is arranged at one end of the inner wall of the shell near the eddy current damper, and a vehicle speed sensor and a vibration sensor are also arranged inside the shell. The present invention solves the problem of "floating" steering wheels of military wheeled vehicles in high-speed driving and bumpy conditions through the mutual cooperation of the screw shaft, the moving block, the eddy current damper and the conductor layer, and ensures the driving stability of the military wheeled vehicles and the personal safety of the drivers.

Description

Technical Field

[0001] The invention belongs to the field of motor vehicle applications, and in particular relates to a power steering device for improving the stability of a steering wheel. Background Art

[0002] At present, due to the large single-axle load, complex road conditions (such as trenches, off-road mountain roads, icy and snowy roads, and muddy roads), and harsh operating conditions, military wheeled vehicles have much higher requirements for handling stability than civilian vehicles. Their vehicle chassis must not only meet the high mobility requirements during road marches and operations, but also have good driving stability and off-road safety under extremely harsh road conditions. Among them, the steering system of wheeled vehicles is the most direct factor affecting the handling stability and driving safety of wheeled vehicles, and its own performance determines the overall performance of the wheeled vehicle chassis system. At present, the steering system of my country's military wheeled vehicles basically adopts a hydraulic power steering system, and the actuator is a recirculating ball hydraulic power steering gear. Therefore, the vehicle steering return mainly depends on the steering positioning parameters, such as the kingpin castor angle and the kingpin inclination angle. Under complex road conditions, the vehicle will be more bumpy, which may easily lead to errors in the positioning parameters, resulting in poor and unstable vehicle return ability, thus affecting the vehicle's maneuverability. For example, when the vehicle is driving at high speed, there will be a feeling of "floating" in the steering, that is, the steering assist is too large, which is determined by the principle of the recirculating ball hydraulic power steering gear. The steering pump in the hydraulic power steering system is powered by the engine. At high speeds, the engine speed increases, the pressure of the hydraulic power steering system increases, and the steering assist naturally increases. Although the new steering oil pump can reduce the oil pump flow pressure during high-speed steering, it cannot fundamentally solve the problem of "floating".

[0003] Therefore, how to provide a power steering device that can automatically adjust the stability of the steering wheel according to the road conditions and the vehicle speed has become one of the problems that technical personnel in this field urgently need to solve. Summary of the invention

[0004] The purpose of the present invention is to provide a power steering device for improving the stability of a steering wheel, so as to solve the deficiencies in the prior art.

[0005] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is:

[0006] A power steering device for improving the stability of a steering wheel, comprising: a housing, an open end of the housing being provided with a support seat assembly, an inner end cover assembly and an outer end cover assembly in order from the inside to the outside, a torque input shaft being rotatably provided in the middle of the outer end cover assembly, a screw shaft being rotatably provided in the middle of the support seat assembly, one end of the screw shaft passing through the inner end cover assembly and being transmission-connected with the torque input shaft, and the other end of the screw shaft being rotatably provided on the inner wall of the housing through a one-way thrust bearing;

[0007] A moving block is arranged on the threaded section of the screw shaft, a tooth groove is arranged at the front end of the moving block, a steering shaft is arranged at the front end of the tooth groove, a gear ring is sleeved on the steering shaft, and the outer teeth of the gear ring mesh with the tooth groove of the moving block for transmission;

[0008] An eddy current damper is arranged at the rear end of the moving block, a conductor layer is arranged at one end of the inner wall of the shell close to the eddy current damper, and a vehicle speed sensor and a vibration sensor are also arranged inside the shell.

[0009] Preferably, an angle sensor is also provided on the steering shaft, and a controller is also provided in the shell, the input end of the controller is electrically connected to the output ends of the vehicle speed sensor, the vibration sensor and the angle sensor, and the output end of the controller is electrically connected to the input end of the eddy current damper.

[0010] Preferably, it also includes: a guide slide rod, the guide slide rod is parallel to the screw shaft, and the two ends of the guide slide rod are respectively fixed on the support seat assembly and the inner wall of the shell; the moving block slides on the guide slide rod.

[0011] Preferably, the eddy current damper includes: a base, which is arranged at the center position of the rear end of the moving block, the base is connected to a friction plate through a connecting rod, the friction plate is in close contact with the conductor layer, and a plurality of electropermanent magnets are also arranged around the base, and the magnetic poles of adjacent electropermanent magnets are opposite.

[0012] Preferably, the eddy current damper further comprises: a displacement type current controller, and the displacement type current controller is electrically connected to the electropermanent magnet.

[0013] Preferably, a heat dissipation hole is provided in the shell at a position close to the conductor layer, and the heat dissipation hole is externally connected to a negative pressure fan.

[0014] Preferably, the support seat assembly includes: a support seat and a one-way thrust angular contact bearing, the outer ring of the support seat is connected to the inner wall of the shell, the inner ring of the support seat is connected to the outer ring of the one-way thrust angular contact bearing, and the inner ring of the one-way thrust angular contact bearing is sleeved on the screw shaft.

[0015] The power steering device for improving the stability of the steering wheel provided by the present invention has the following advantages compared with the prior art:

[0016] The present invention solves the problem of "floating" steering wheels of military wheeled vehicles under high-speed and bumpy conditions by means of the mutual cooperation of the screw shaft, the moving block, the eddy current damper and the conductor layer, thereby ensuring the driving stability of the military wheeled vehicles and the personal safety of the drivers. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0018] Figure 1 It is a top cross-sectional view of the present invention;

[0019] Figure 2 Schematic diagram of the distribution of the electropermanent magnets of the present invention.

[0020] In the figure: 1-housing, 2-support seat assembly, 21-support seat, 22-one-way thrust angular contact bearing, 3-inner end cover assembly, 4-outer end cover assembly, 5-torque input shaft, 6-screw shaft, 7-moving block, 8-tooth groove, 9-eddy current damper, 91-base, 92-friction plate, 93-electropermanent magnet, 10-steering shaft, 11-gear ring, 12-conductor layer, 13-guide slide rod, 14-heat dissipation hole. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0022] refer to Figure 1-2 As shown, the present invention provides a power steering device for improving the stability of a steering wheel, comprising: a housing 1, an open end of the housing 1 is provided with a support seat assembly 2, an inner end cover assembly 3 and an outer end cover assembly 4 in sequence from the inside to the outside, a torque input shaft 5 is rotatably provided in the middle of the outer end cover assembly 4, a screw shaft 6 is rotatably provided in the middle of the support seat assembly 2, one end of the screw shaft 6 passes through the inner end cover assembly 3 and is transmission-connected to the torque input shaft 5, and the other end of the screw shaft 6 is rotatably provided in the middle of the support seat assembly 2 through a one-way thrust bearing. On the inner wall of the shell 1; a moving block 7 is arranged on the threaded section of the screw shaft 6, a tooth groove 8 is arranged at the front end of the moving block 7, a steering shaft 10 is arranged at the front end of the tooth groove 8, a gear ring 11 is sleeved on the steering shaft 10, and the outer teeth of the gear ring 11 are meshed with the tooth groove 8 of the moving block for transmission; an eddy current damper 9 is arranged at the rear end of the moving block 7, a conductor layer 12 is arranged on the inner wall of the shell 1 close to the end of the eddy current damper 9, and a vehicle speed sensor and a vibration sensor are also arranged inside the shell 1.

[0023] As a preferred embodiment, an angle sensor is also provided on the steering shaft 10, and a controller is also provided in the housing 1, the input end of the controller is electrically connected to the output ends of the vehicle speed sensor, the vibration sensor and the angle sensor, and the output end of the controller is electrically connected to the input end of the eddy current damper 9.

[0024] As a preferred embodiment, it further comprises: a guide slide bar 13, the guide slide bar 13 is parallel to the screw shaft 6, and the two ends of the guide slide bar 13 are respectively fixed to the support seat assembly 2 and the inner wall of the housing 1; the moving block 7 slides on the guide slide bar 13. The guide slide bar 13 is used to limit the moving direction of the moving block 7.

[0025] As a preferred embodiment, the eddy current damper 9 includes: a base 91, the base 91 is arranged at the center position of the rear end of the moving block 7, the base 91 is connected to a friction plate 92 through a connecting rod, the friction plate 92 is in close contact with the conductor layer 12, and a plurality of electro-permanent magnets 93 are arranged around the base 91, and the magnetic poles of adjacent electro-permanent magnets 93 are opposite. The eddy current damper 9 also includes: a displacement type current controller, the displacement type current controller is electrically connected to the electro-permanent magnet 93. When the vehicle speed sensor detects that the vehicle speed is too fast and turns, the electro-permanent magnet 93 and the displacement type current controller switch are activated; when the vibration sensor detects that the vehicle passes through a pothole section, the electro-permanent magnet 93 and the displacement type current controller switch are activated.

[0026] As a preferred embodiment, the housing 1 is provided with a heat dissipation hole 14 near the conductor layer 12, and a negative pressure fan is externally connected to the heat dissipation hole 14. The heat generated by the friction between the friction plate 92 and the conductor layer 12 and the heat generated by the eddy current in the conductor layer 12 are discharged to the outside through the heat dissipation hole 14 under the action of the negative pressure fan.

[0027] As a preferred embodiment, the support seat assembly 2 includes: a support seat 21 and a one-way thrust angular contact bearing 22, the outer ring of the support seat 21 is connected to the inner wall of the shell 1, the inner ring of the support seat 21 is connected to the outer ring of the one-way thrust angular contact bearing 22, and the inner ring of the one-way thrust angular contact bearing 22 is sleeved on the screw shaft 6.

[0028] The working principle of the present invention is:

[0029] When the military wheeled vehicle is on a flat road and the vehicle speed is lower than a preset value, the switches of the electro-permanent magnet 93 and the displacement current controller are not activated. At this time, there is only a weak damping between the friction plate 92 and the conductor layer 12, and the steering wheel rotation force is moderate;

[0030] When the military wheeled vehicle is on a flat road and the vehicle speed is higher than or equal to the preset value, the vehicle speed sensor captures the signal and transmits it to the controller to start the switch of the electro-permanent magnet 93 and the displacement current controller. The displacement current controller changes the size of the control current according to the displacement of the moving block 7. The conductor layer 12 cuts the magnetic flux in the local magnetic field generated by the electro-permanent magnet 93, so that the magnetic flux of the conductor layer 12 changes continuously when cutting the magnetic flux. At this time, the local electromagnetic field generated by the electro-permanent magnet 93 will hinder this relative movement, and thus eddy currents will be generated in the conductor layer 12, so that the kinetic energy of the moving block 7 is converted into heat energy, which is discharged into the outside world through the heat dissipation holes 14 under the action of the negative pressure fan, solving the problem of the steering wheel "floating" when the vehicle is driving at high speed, ensuring the driving stability of the vehicle and the personal safety of the driver. When the steering wheel is returned to the correct direction, the angle sensor captures the signal and transmits it to the controller to turn off the switch of the electro-permanent magnet and the displacement current controller, so as to facilitate the driver to return to the correct direction.

[0031] When a military wheeled vehicle is on a bumpy road, the vibration sensor captures a signal and transmits it to the controller to start the switch of the electro-permanent magnet 93 and the displacement-type current controller, and at the same time turns off the switch of the angle sensor. When the vehicle enters a flat road, the vibration sensor also captures a signal and transmits it to the controller to turn off the switch of the electro-permanent magnet 93 and the displacement-type current controller.

[0032] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0033] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0034] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A power steering device for improving the stability of a steering wheel, characterized in that: include: A shell (1), wherein the open end of the shell (1) is provided with a support seat assembly (2), an inner end cover assembly (3) and an outer end cover assembly (4) in order from the inside to the outside, a torque input shaft (5) is rotatably provided in the middle of the outer end cover assembly (4), a screw shaft (6) is rotatably provided in the middle of the support seat assembly (2), one end of the screw shaft (6) passes through the inner end cover assembly (3) and is transmission-connected to the torque input shaft (5), and the other end of the screw shaft (6) is rotatably provided on the inner wall of the shell (1) via a one-way thrust bearing; A moving block (7) is arranged on the threaded section of the screw shaft (6), a tooth groove (8) is arranged at the front end of the moving block (7), a steering shaft (10) is arranged at the front end of the tooth groove (8), a gear ring (11) is sleeved on the steering shaft (10), and the external teeth of the gear ring (11) mesh with the tooth groove (8) of the moving block for transmission; An eddy current damper (9) is provided at the rear end of the moving block (7), a conductor layer (12) is provided at one end of the inner wall of the housing (1) close to the eddy current damper (9), and a vehicle speed sensor and a vibration sensor are also provided inside the housing (1); An angle sensor is also provided on the steering shaft (10), and a controller is also provided in the housing (1), the input end of the controller is electrically connected to the output ends of the vehicle speed sensor, the vibration sensor and the angle sensor, and the output end of the controller is electrically connected to the input end of the eddy current damper (9); The eddy current damper (9) comprises: a base (91), the base (91) being arranged at the center position of the rear end of the moving block (7), the base (91) being connected to a friction plate (92) via a connecting rod, the friction plate (92) being in close contact with the conductor layer (12), and a plurality of electro-permanent magnets (93) being arranged around the base (91), and the magnetic poles of adjacent electro-permanent magnets (93) being opposite.

2. A power steering device for improving steering wheel stability according to claim 1, characterized in that: Also includes: A guide slide rod (13), wherein the guide slide rod (13) is parallel to the screw shaft (6), and the two ends of the guide slide rod (13) are respectively fixed on the support seat assembly (2) and the inner wall of the shell (1); the moving block (7) slides on the guide slide rod (13).

3. A power steering device for improving steering wheel stability according to claim 1, characterized in that: The eddy current damper (9) further comprises: a displacement type current controller, wherein the displacement type current controller is electrically connected to the electropermanent magnet (93).

4. A power steering device for improving steering wheel stability according to claim 1, characterized in that: The housing (1) is provided with a heat dissipation hole (14) at a position close to the conductor layer (12), and the heat dissipation hole (14) is externally connected to a negative pressure fan.

5. A power steering device for improving steering wheel stability according to claim 1, characterized in that: The support seat assembly (2) comprises: a support seat (21) and a one-way thrust angular contact bearing (22); the outer ring of the support seat (21) is connected to the inner wall of the housing (1); the inner ring of the support seat (21) is connected to the outer ring of the one-way thrust angular contact bearing (22); and the inner ring of the one-way thrust angular contact bearing (22) is sleeved on the screw shaft (6).

Images