Three-drive power-assisted steering system

Abstract

The utility model discloses a three-drive power-assisted steering system, which relates to the technical field of automobile power-assisted steering and comprises a motor, a driving structure B, a driving structure A, a steering pull rod, wheels, a bracket, a universal joint B, an adapter shaft lever, a steering column and a steering wheel, the technical key points are as follows: by adopting a double-end output mode of two rotating shafts of a motor, an electric push rod is switched between a contraction state and an extension state, one end of a pressing block B is withdrawn from the interior of one hanging arm, the motor descends under the hanging of the two hanging arms, or one end of the pressing block B extends into the interior of one hanging arm, and the electric push rod is driven to rotate by means of fitting and pressing of an inclined surface of a contact surface; the hanging arm is lifted to the top, two rotating shafts of the motor provide power for the corresponding driving structure A and the driving structure B, the driving structure A assists in reducing the resistance generated when a steering wheel rotates in the state of small torque resistance, the driving structure B cooperates with the driving structure A to directly control wheels to steer in the condition of large torque resistance, and the application range is wide.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile steering assist, specifically is a three drive assist steering system. BACKGROUND

[0002] The automobile steering system mainly refers to a series of devices for changing or maintaining the direction of automobile driving or reversing. The function of the automobile steering system is to control the driving direction of the automobile according to the will of the driver. The automobile steering system is crucial to the driving safety of the automobile, so the parts of the automobile steering system are called safety parts.

[0003] The automobile steering assist helps the driver to adjust the direction of the automobile and reduces the force intensity of the driver steering the steering wheel. Of course, the steering assist also has a certain effect on the safety and economy of the automobile driving. The assist steering system configured on the automobile can be roughly divided into three categories, namely the mechanical hydraulic power steering system, the electronic hydraulic assist steering system and the electric assist steering system. The mechanical hydraulic power steering system is generally composed of a hydraulic pump, an oil pipe, a pressure flow control valve body, a V-shaped transmission belt and an oil tank.

[0004] The traditional mechanical hydraulic steering assist system has strong reliability and does not depend on the electronic system. Even if the hydraulic pressure is broken, the steering can still be performed, but the hand feeling is heavy. At the same time, the road feeling is very clear, and any vibration is reflected on the steering wheel. With the progress of electronic control technology, in order to improve the shortcomings of the mechanical hydraulic steering assist system, the electric assist steering system (EPS) has become the mainstream configuration of the current passenger car. The electric assist steering system can be divided into four types according to the assist mode, namely the steering column (2) assist type C-EPS, the gear assist type P-EPS, the double pinion type DP-EPS and the rack parallel type RP-EPS. The column type electric assist steering device is suitable for compact vehicles that do not require too much assist. The pinion type electric assist steering device is only suitable for small vehicles. The double pinion type electric assist steering device has limited assist due to the gear and rack engagement. The rack parallel type electric assist steering device has large resistance and is suitable for medium and large vehicles.

[0005] The assist mode of the existing electric assist steering system is influenced by the road conditions, frequent steering, environmental temperature, vehicle vibration and external interference, and other factors, and the working condition is complex, which can easily cause power deficiency, power excess, virtual position and false hand feeling. In different driving scenarios of the automobile, the assist steering system has insufficient flexibility and cannot meet the wide range of torque resistance requirements. SUMMARY

[0006] In order to overcome the deficiencies of the prior art, the embodiment of the present application provides a three-drive power steering system, which adopts the double-end output mode of the two rotating shafts of the motor, switches the electric push rod between the retracted state and the extended state, makes one end of the pressing block B exit from the inside of one hanging arm, and makes the motor descend under the hanging of the two hanging arms, or makes one end of the pressing block B extend into the inside of one hanging arm, applies pressure by the fitting of the inclined surface of the contact surface, lifts the hanging arm to the top, and makes the two rotating shafts of the motor provide power for the corresponding driving structure A and driving structure B, so as to facilitate the reduction of the resistance when the driving structure A assists the rotation of the steering wheel in the state of small torque resistance, and directly controls the steering of the wheels by the driving structure B and the driving structure A in the case of large torque resistance, so as to achieve the technical effect that the power steering system is flexibly adjusted and adapts to the wide-range torque resistance adjustment requirement in different driving scenes of the automobile.

[0007] The technical solution adopted by the embodiment of the present application to solve the technical problem is:

[0008] A three-drive power steering system, comprising a motor, a driving structure B and a driving structure A, the driving structure B is arranged at one end of the motor and is powered by the rotating shaft of the motor on this side;

[0009] The driving structure A is arranged at the other end of the motor and is powered by the rotating shaft of the motor on this side;

[0010] The driving structure A and the driving structure B are combined and used on the same straight line, and both sides are hingedly connected with steering tie rods, one end of the steering tie rod is provided with a wheel, and one end of the two steering tie rods is commonly hingedly connected with a support; the top of the driving structure A is assembly-type connected with a universal joint B, one end of the universal joint B is assembly-type connected with a conversion shaft, one end of the conversion shaft is assembly-type connected with a steering column through a universal joint A, and one end of the steering column is provided with a steering wheel;

[0011] The motor supports the driving structure B at one end of the rotating shaft to directly control the steering state of the wheels, and supports the driving structure A at the other end of the rotating shaft to assist and cooperate with the steering wheel to rotate, so as to control the steering state of the wheels.

[0012] Preferably, the driving structure B comprises a driven roller sleeve, the inner side of the driven roller sleeve is transmission-type connected with a lead screw, one end of the rotating shaft of the motor is assembly-type connected with a driving roller sleeve, and one end between the driven roller sleeve and the driving roller sleeve is transmission-type connected with a transmission belt.

[0013] Preferably, the driving structure A comprises a gear and rack assembly, the top of the gear and rack assembly is assembly-type connected with a speed reducer; the rotating shaft of the motor at one end extends into the inside of the speed reducer, one end of the rack on the gear and rack assembly is integrally processed with one end of the lead screw, and the other end of the rack on the gear and rack assembly and the other end of the lead screw are respectively hingedly connected with one end of the two steering tie rods.

[0014] Preferably, the top of the motor is provided with a switching structure, the switching structure comprises a hanger, two seat sleeves are integrally formed at the bottom of one side of the hanger, a hanging arm is slidably connected in the two seat sleeves, an electric push rod is arranged between the two hanging arms, one end of the electric push rod is assembledly connected with a frame, one end of the frame is assembledly connected with a pressing block B, and the other end of the frame is assembledly connected with a pressing block A; the two seat sleeves are symmetrically arranged at the two ends of the motor, the two hanging arms are respectively sleeved on the outside of the two rotating shafts of the motor, and one end of the pressing block B and the pressing block A is respectively slidably connected in the inside of the two hanging arms, so as to support the up-down movement of the two hanging arms and control the lifting of the motor.

[0015] Preferably, the cross section of the pressing block B and the pressing block A is a right trapezoid, and the inclined surfaces of the pressing block B and the pressing block A are respectively towards the top and the bottom; the inside of the two hanging arms is respectively processed with a right trapezoidal notch which is matched with the pressing block B and the pressing block A.

[0016] Preferably, a support is weldedly connected at the bottom of one side of the hanger, the support is located in the inside of the frame and supports the end of the electric push rod which is not assembled with the frame.

[0017] Preferably, the control unit is further arranged, a torque sensor is arranged at the outside of one end of the steering column, the torque sensor obtains the torque signal when the steering column is controlled to rotate by the steering wheel and transmits the torque signal to the control unit, and the control unit sends a driving signal to the motor according to the torque signal, the vehicle speed signal and the vehicle direction feedback signal.

[0018] Preferably, a torque threshold value is set for the torque information obtained by the torque sensor, when the torque signal obtained by the control unit is less than the torque threshold value, the motor suspension control signal is sent to the electric push rod, so that the electric push rod is in the contraction state, the rotating shaft at one end of the motor drives the gear set in the reducer, and the auxiliary gear and toothed rod assembly controls the direction state of the wheels between the two steering pull rods.

[0019] When the torque signal obtained by the control unit is greater than the torque threshold value, the motor suspension control signal is sent to the electric push rod, so that the electric push rod is in the elongation state, the rotating shaft at the other end of the motor drives the driving roller sleeve to move towards the top, and when the transmission belt between the driving roller sleeve and the driven roller sleeve is tensioned, the driving roller sleeve, the transmission belt and the driven roller sleeve control the movement of the lead screw between the two wheels, so as to directly control the direction state of the wheels.

[0020] In summary, the utility model has at least one of the following beneficial technical effects:

[0021] One, the utility model discloses a three drive power-assisted steering system through the electric push rod is in the contraction state, the one end of pressure block B is from the inside of a hanging arm, and the motor is descended under the hanging of two hanging arms, and the gear of the one end of hanging arm is engaged with the gear inside the reducer, and the rotation of the gear on the gear rack assembly is assisted, can when the steering wheel is controlled gear rack assembly gear rotation through universal joint A, switching shaft rod and universal joint B, the resistance when the steering wheel rotates is assisted to reduce, and the steering wheel rotates smoothly.

[0022] Two, the utility model discloses a three drive power-assisted steering system through the electric push rod is in the elongation state, and the one end of pressure block B is inserted into the inside of a hanging arm, and the top is lifted to the hanging arm with the help of the contact surface inclined surface pressure, when the motor control rotation, power is transmitted from the driving roller sleeve to the driven roller sleeve, in the case where the axial position of driven roller sleeve is kept unchanged, the gear rack assembly on the gear rack assembly is directly controlled in the axial direction gear rack control steering drag link movement, and the wheel is rotated around the hinged point on the support, and the steering state is adjusted. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the overall structure schematic diagram of the utility model;

[0024] Figure 2 It is the connection structure schematic diagram of drive structure B and drive structure A of the utility model;

[0025] Figure 3 It is the structure schematic diagram of drive structure A and drive structure B of the utility model;

[0026] Figure 4 It is the sectional view of steering drag link of the utility model;

[0027] Figure 5 It is the control flow chart of motor of the utility model.

[0028] Fig. 1, steering wheel;2, steering column;3, torque sensor;4, universal joint A;5, switching shaft rod;6, support;7, wheel;8, universal joint B;9, drive structure A;901, reducer;902, gear rack assembly;10, hanger;11, motor;12, drive structure B;1201, driven roller sleeve;1202, transmission belt;1203, driving roller sleeve;1204, lead screw;13, pressure block A;14, seat cover;15, frame;16, support;17, electric push rod;18, hanging arm;19, pressure block B;20, steering drag link. DETAILED DESCRIPTION

[0029] Example 1:

[0030] A three drive power-assisted steering system, such as Figure 1 - Figure 5As shown, including motor 11, set in the motor 11 one end of the drive structure B12 and set in the motor 11 the other end of the drive structure A9, drive structure A9 and drive structure B12 combination in the same line combination used, and both sides are articulated steering tie rod 20, steering tie rod 20 one end provided with the wheel 7, and both ends of the steering tie rod 20 one end of the common articulated bracket 6;

[0031] As shown, Figure 1 The top of the drive structure A9 is assembled with universal joint B8, one end of the universal joint B8 is assembled with adapter shaft 5, one end of the adapter shaft 5 is assembled with steering column 2 through universal joint A4, one end of the steering column 2 is provided with steering wheel 1;

[0032] Among them, the motor 11 is supported by the shaft at one end of the drive structure B12 to directly control the steering state of the wheel 7, and the other end of the shaft is supported by the drive structure A9 to assist and cooperate with the steering wheel 1 to rotate, so as to control the steering state of the wheel 7;

[0033] As shown, Figure 2 And Figure 3 As shown, the drive structure B12 includes a driven roller sleeve 1201, a lead screw 1204 is drivingly connected to the inner side of the driven roller sleeve 1201, one end of the motor 11 shaft is assembled with a driving roller sleeve 1203, and a transmission belt 1202 is drivingly connected between one end of the driven roller sleeve 1201 and the driving roller sleeve 1203;

[0034] The drive structure A9 includes a gear rack assembly 902, and a reducer 901 is assembled on the top of the gear rack assembly 902;

[0035] Among them, by making the shaft of the motor 11 at one end extend into the inside of the reducer 901, the one end of the rack on the gear rack assembly 902 and the one end of the lead screw 1204 are machined into one body, and the other end of the rack on the gear rack assembly 902 and the other end of the lead screw 1204 are respectively hinged to one end of the two steering tie rods 20, when the motor 11 drives the gear inside the reducer 901 through the shaft at one end (two bevel gears can be kept vertical, one bevel gear moves from top to bottom, completing the meshing connection of bevel gears), the motor 11 controls the gear assembly of the reducer 901 to rotate, the gear assembly is powered by the motor 11, and the gear on the gear rack assembly 902 is rotated, when the driver rotates the steering wheel 1, the resistance when the steering wheel 1 rotates can be further reduced in the process of controlling the gear on the gear rack assembly 902 to rotate through the universal joint A4, the adapter shaft 5 and the universal joint B8;

[0036] Meanwhile, when the shafts at the other ends of the motor 11 move toward the top along with the motor 11, the transmission belt 1202 is tensioned between the driving roller sleeve 1203 and the driven roller sleeve 1201, and the driven roller sleeve 1201 is cooperated with the driving roller sleeve 1203 and the transmission belt 1202 to rotate (the axial position is unchanged), the lead screw 1204 is controlled to move between the two wheels 7, the lead screw 1204 and the rack on the gear rack assembly 902 are directly powered by the motor 11, the two steering pull rods 20 are controlled to move in the horizontal plane, and thus the wheels 7 are controlled to rotate around one end of the support 6 to adjust the direction of the wheels 7;

[0037] In some examples, the top of the motor 11 is provided with a switching structure, the switching structure includes the hanger 10, the bottom of one side of the hanger 10 is integrally formed with two seat sleeves 14, the interiors of the two seat sleeves 14 are slidably connected with two hanging arms 18, the two hanging arms 18 are provided with the electric push rod 17, one end of the electric push rod 17 is assembledly connected with the frame 15, one end of the frame 15 is assembledly connected with the pressing block B 19, and the other end of the frame 15 is assembledly connected with the pressing block A 13.

[0038] As shown in Figure 3 and Figure 4 , the two seat sleeves 14 are symmetrically arranged at the two ends of the motor 11, the two hanging arms 18 are respectively sleeved on the exteriors of the two shafts of the motor 11, the cross sections of the pressing block B 19 and the pressing block A 13 are right trapezoids, the inclined surfaces of the pressing block B 19 and the pressing block A 13 respectively face the top and the bottom, and the interiors of the two hanging arms 18 are respectively processed with right trapezoidal notches matched with the pressing block B 19 and the pressing block A 13.

[0039] As shown in Figure 4 , the bottom of one side of the hanger 10 is weldedly connected with the support 16, the support 16 is located on the inner side of the frame 15 and supports the end of the electric push rod 17 which is not assembled with the frame 15.

[0040] The end of the pressing block B 19 and the end of the pressing block A 13 are respectively slidably connected in the interiors of the two hanging arms 18, when the electric push rod 17 is in the retracted state, the end of the pressing block B 19 is withdrawn from the interior of one of the hanging arms 18 and remains to support the hanging arm 18 (the contact surface is always attached), the end of the pressing block A 13 is inserted into the interior of the other hanging arm 18, and the pressing is realized by the attachment of the inclined surface of the contact surface, so that the gear at one end of the shaft of the motor 11 can be stably meshed with the gear in the speed reducer 901 during the process that the two hanging arms 18 suspend the motor 11 to move toward the bottom.

[0041] Meanwhile, when the electric push rod 17 is in the elongated state, one end of the pressing block B19 extends into the interior of one hanging arm 18, and the hanging arm 18 is lifted to the top by the pressure of the contact surface inclined surface, the pressing block A13 is withdrawn from the interior of the other hanging arm 18, and in the case that the two hanging arms 18 are movably arranged in the interiors of the two seat sleeves 14, the other end rotating shaft of the motor 11 drives the driving roller sleeve 1203 to move to the top, so that the transmission belt 1202 is tensioned by the driving roller sleeve 1203 and the driven roller sleeve 1201, and power is transmitted from the driving roller sleeve 1203 to the driven roller sleeve 1201 when the motor 11 controls the rotation of the rotating shaft.

[0042] It is worth noting that the three-drive power-assisted steering system also comprises a control unit, and the outer end of the steering column 2 is provided with a torque sensor 3, the torque sensor 3 obtains a torque signal when the steering wheel 1 controls the rotation of the steering column 2, and transmits the torque signal to the control unit, and the control unit sends a driving signal to the motor 11 according to the torque signal, the vehicle speed signal and the vehicle direction feedback signal;

[0043] The torque threshold is set according to the torque information obtained by the torque sensor 3, when the torque signal obtained by the control unit is less than the torque threshold, the motor suspension control signal is sent to the electric push rod 17, so that the electric push rod 17 is in the retracted state, and when the torque signal obtained by the control unit is greater than the torque threshold (that is, when the steering wheel 1 is rotated to control the steering of the wheels 7, the resistance is greater), the motor suspension control signal is sent to the electric push rod 17, so that the electric push rod 17 is in the elongated state, which is beneficial to the corresponding control and reduces the resistance felt by the driver when operating the steering wheel 1.

[0044] The three-drive power-assisted steering system adopts the double-end output mode of the two rotating shafts of the motor 11, when the electric push rod 17 is in the retracted state, one end of the pressing block B19 is withdrawn from the interior of one hanging arm 18, the motor 11 is lowered under the hanging of the two hanging arms 18, the gear at one end of the hanging arm 18 is engaged with the gear in the interior of the speed reducer 901, and the gear on the auxiliary gear and toothed rod assembly 902 is rotated, so that the resistance of the steering wheel 1 when rotating is reduced, the steering wheel 1 is rotated smoothly, and finally the steering pull rod 20 is controlled by the driving structure A9 and the driving structure B12, so that the wheels 7 rotate around the hinge point on the support 6;

[0045] At the same time, when the electric push rod 17 is in the elongated state, one end of the pressing block B19 extends into the interior of a hanging arm 18, and the hanging arm 18 is lifted to the top by the pressure of the contact surface inclined surface, so that the other end of the motor 11 drives the driving roller sleeve 1203 to move to the top, thereby supporting the transmission belt 1202 to be tensioned by the driving roller sleeve 1203 and the driven roller sleeve 1201, facilitating the motor 11 to control the rotation of the shaft, and transmitting power from the driving roller sleeve 1203 to the driven roller sleeve 1201, so that the screw rod 1204 drives the gear rack assembly 902 on the rack to control the movement of the steering pull rod 20, and the wheel 7 rotates around the hinge point on the support 6, thereby adjusting the steering state.

[0046] Finally, it should be noted that: obviously, the above embodiments are only examples for clearly illustrating the present application, and are not limitations on the embodiments. Based on the above description, other different forms of changes or variations can also be made by those of ordinary skill in the art. Here, it is not necessary and impossible to exhaust all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A three-wheel drive power steering system, characterized in that, include: Motor (11); The drive structure B (12) is located at one end of the motor (11) and is powered by the shaft on that side of the motor (11); Drive structure A (9) is located at the other end of motor (11) and is powered by the shaft on that side of motor (11); The drive structure A (9) and drive structure B (12) are combined and used on the same straight line, and both sides are hinged with steering tie rods (20). One end of the steering tie rod (20) is provided with a wheel (7), and one end of the two steering tie rods (20) is hinged to a bracket (6). The top of the drive structure A (9) is assembled with a universal joint B (8), one end of the universal joint B (8) is assembled with a transition shaft (5), one end of the transition shaft (5) is assembled with a steering column (2) through a universal joint A (4), and one end of the steering column (2) is provided with a steering wheel (1). The motor (11) directly controls the steering state of the wheel (7) through the rotating shaft support drive structure B (12) at one end, and is assisted by the rotating shaft support drive structure A (9) at the other end and rotates in conjunction with the steering wheel (1) to control the steering state of the wheel (7).

2. The three-wheel drive power steering system as described in claim 1, characterized in that: The drive structure B (12) includes a driven roller sleeve (1201), a lead screw (1204) is connected to the inner side of the driven roller sleeve (1201), a drive roller sleeve (1203) is assembled and connected to one end of the motor (11) shaft, and a drive belt (1202) is connected between one end of the driven roller sleeve (1201) and the drive roller sleeve (1203).

3. The three-wheel drive power steering system as described in claim 2, characterized in that: The drive structure A (9) includes a gear rack assembly (902), and a reducer (901) is mounted on the top of the gear rack assembly (902); The motor (11) has a shaft that extends into the reducer (901). One end of the gear rack on the gear rack assembly (902) is machined into one piece with one end of the lead screw (1204). The other end of the gear rack on the gear rack assembly (902) and the other end of the lead screw (1204) are respectively hinged to one end of the two steering tie rods (20).

4. A three-wheel drive power steering system as described in claim 1, characterized in that: The top of the motor (11) is provided with a switching structure, which includes a bracket (10). Two seat covers (14) are integrally formed on the bottom of one side of the bracket (10). The two seat covers (14) are slidably connected to the inside of each of the two seat covers (14). An electric push rod (17) is provided between the two hangers (18). A frame (15) is assembled and connected to one end of the electric push rod (17). A pressure block B (19) is assembled and connected to one end of the frame (15). A pressure block A (13) is assembled and connected to the other end of the frame (15). Among them, the two seat covers (14) are symmetrically arranged at both ends of the motor (11), the two hanging arms (18) are respectively sleeved on the outside of the two rotating shafts of the motor (11), and one end of the pressure block B (19) and pressure block A (13) are respectively slidably connected to the inside of the two hanging arms (18), supporting the two hanging arms (18) to move up and down, and controlling the motor (11) to rise and fall.

5. A three-wheel drive power steering system as described in claim 4, characterized in that: The cross-sections of the pressure block B (19) and the pressure block A (13) are both right-angled trapezoids. The inclined surfaces of the pressure block B (19) and the pressure block A (13) face the top and bottom respectively. The interiors of the two hanging arms (18) are respectively machined with right-angled trapezoidal slots that are compatible with the pressure block B (19) and the pressure block A (13).

6. A three-wheel drive power steering system as described in claim 5, characterized in that: A support (16) is welded to the bottom of one side of the bracket (10). The support (16) is located inside the frame (15) and supports the end of the electric push rod (17) that is not assembled with the frame (15).

7. A three-wheel drive power steering system as described in claim 1, characterized in that: It also includes a control unit. A torque sensor (3) is provided on the outside of one end of the steering column (2). The torque sensor (3) acquires the torque signal when the steering wheel (1) controls the steering column (2) to rotate and transmits it to the control unit. The control unit sends a drive signal to the motor (11) based on the torque signal, vehicle speed signal and vehicle direction feedback signal.

8. A three-wheel drive power steering system as described in claim 7, characterized in that: A torque threshold is set for the torque information obtained by the torque sensor (3). When the torque signal obtained by the control unit is less than the torque threshold, a motor suspension control signal is sent to the electric push rod (17) so that the electric push rod (17) is in a retracted state. The shaft at one end of the motor (11) drives the gear set inside the reducer (901), and the auxiliary gear rack assembly (902) controls the direction of the wheel (7) between the two steering tie rods (20). When the torque signal obtained by the control unit is greater than the torque threshold, a motor suspension control signal is sent to the electric push rod (17) to make the electric push rod (17) in an extended state, causing the other end shaft of the motor (11) to drive the active roller sleeve (1203) to move to the top. When the transmission belt (1202) between the active roller sleeve (1203) and the driven roller sleeve (1201) is tightened, the lead screw (1204) controlled by the active roller sleeve (1203), the transmission belt (1202) and the driven roller sleeve (1201) moves between the two wheels (7) to directly control the direction of the wheels (7).

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