CN210454946U

CN210454946U - An electronically controlled steering system for a steering axle

Info

Publication number: CN210454946U
Application number: CN201921415340.5U
Authority: CN
Inventors: 张小江
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 2019-08-29
Filing date: 2019-08-29
Publication date: 2020-05-05
Anticipated expiration: 2029-08-29

Abstract

The utility model discloses an electric control steering system of a steering axle, which comprises a motor, a reducer, a full hydraulic steering gear, a locking valve group, a control valve group and an energy accumulator; the full hydraulic steering gear is connected with the motor through the speed reducer and is respectively connected with the steering pump, the oil tank and the steering oil cylinder through oil pipes. The control valve group is respectively connected with the oil pump, the locking oil cylinder, the steering oil cylinder and the energy accumulator through oil pipes. The steering system has the functions of electric control steering and fault locking; the axle steering and the axle locking ensure that only one function is acted at the same time through hydraulic control. The system is an electric control steering system, and has the advantages of low price, moderate steering precision and high safety factor.

Description

Electric control steering system of steering axle

Technical Field

The utility model relates to an automatically controlled a steering system of steering axle.

Background

With the development of vehicle technology, electronically controlled steering systems are increasingly widely used. However, the cost of the existing electric control steering system is high, the application and popularization of the electric control steering technology are restricted, and the electric control steering system with relatively low cost is urgently needed at present.

Disclosure of Invention

The utility model discloses an aim at solving present automatically controlled actual problem that turns to the cost too high, provide an automatically controlled steering system with low relative cost, control accuracy are moderate. The utility model relates to an utilize the full hydraulic steering gear of control motor drive and then control the axle and turn to, the axle possesses the automatically controlled a steering system who returns positive locking when the system breaks down simultaneously.

The utility model discloses a motor, reduction gear, full hydraulic steering ware, steering axle, steering cylinder, locking valves, locking hydro-cylinder, valves, energy storage ware, first driving motor, first hydraulic pump, second driving motor, second hydraulic pump, oil tank. The first hydraulic pump and the second hydraulic pump supply oil to the steering circuit and the lockup circuit, respectively. The motor drives the full hydraulic steering to work, further drives the steering axle to rotate, and the locking oil cylinder is in a follow-up state at the moment. When the steering system fails or needs to be returned, high-pressure oil of the energy accumulator enters the large cavity and the small cavity of the locking oil cylinder under the action of the control valve group, and the locking oil cylinder returns to the middle position and is locked under the action of the high-pressure oil; and meanwhile, under the action of the control valve, the large cavity and the small cavity of the steering oil cylinder are connected with an oil return port of the control valve group, so that the steering oil cylinder is in a follow-up state.

The utility model has the advantages that:

1. the utility model discloses a full hydraulic steering gear of motor drive rotates and then drives the steering axle and turns to, and the cost is lower relatively, and the control progress is moderate, and the range of application on engineering vehicle is wider.

2. The electric control steering system can realize the automatic locking function, ensure that the vehicle can still continue to work when the electric control system breaks down, and improve the safety of the steering system.

3. The axle steering loop and the locking loop are controlled by a hydraulic valve, and no movement interference is generated.

4. An accumulator is used to supply oil to the lock-up loop. When the pressure of the energy accumulator reaches the preset pressure, the first hydraulic pump stops working or the outlet of the first hydraulic pump is connected with the oil return port, and the energy consumption of the system is reduced.

Drawings

Fig. 1 is a schematic structural diagram of an electric steering system of a novel steering axle of the present invention.

Fig. 2 is the utility model discloses an inside schematic diagram of automatically controlled a steering system's of novel steering axle valve unit

Wherein: 1-a motor; 2-full hydraulic steering gear; 3-a steering axle; 4-a steering oil cylinder; 5-locking valve group; 6-locking the oil cylinder; 7-a locking valve group; 8-an accumulator; 9-a first drive motor; 91-a second drive motor; 10-a first hydraulic pump; 101-a second hydraulic pump; 11-a filter; 12-a fuel tank; 13-a reducer; 71-a first pilot operated check valve; 711-second hydraulic control one-way valve; 72-a first relief valve; 721-a second overflow valve; 73-a first two-position three-way electric control valve; 731-a second two-position three-way electric control valve; 74-a one-way valve; 75-two-position four-way electric control valve.

Detailed Description

Referring to fig. 1, the present invention includes a motor 1, a full hydraulic steering gear 2, a steering axle 3, a steering cylinder 4, a locking valve set 5, a locking cylinder 6, a locking valve set 7, an energy accumulator 8, a first driving motor 9, a second driving motor 91, a first hydraulic pump 10, a second hydraulic pump 101, a filter 11, an oil tank 12 and a speed reducer 13.

The input end of the speed reducer 13 is connected with the motor 1, and the output end of the speed reducer 13 is connected with a mechanical input shaft of the full hydraulic steering gear 2. An oil inlet of the full hydraulic steering gear 2 is connected with an oil outlet of the second hydraulic pump 101, and an oil return port of the full hydraulic steering gear 2 is connected with an oil tank 12 through a filter 11 and an oil pipe; the L port and the R port of the full hydraulic steering gear 2 are respectively connected with the large cavity and the small cavity of the steering oil cylinder 4. An oil inlet P of the control valve group 7 is connected with a first hydraulic pump 10, and an oil return port T of the control valve group 7 is connected with an oil tank 12 through a filter 11; a port A and a port B of the control valve group 7 are respectively connected with a large cavity and a small cavity of the steering oil cylinder 4, an N port, an X port and a Q port of the control valve group 7 are respectively connected with an N port, an X port and a T port of the locking valve group 5, and an R port of the control valve group 7 is connected with the energy accumulator 8. And the port A, the port B and the port T1 of the locking valve group 5 are respectively connected with a large cavity, a small cavity and an oil return cavity of the locking oil cylinder 6. The first hydraulic pump 10 and the second hydraulic pump 101 are driven by the first drive motor 9 and the second drive motor 91, respectively; oil inlets of the first hydraulic pump 10 and the second hydraulic pump 101 are connected with an oil tank 12.

The control valve group 7 further comprises a first hydraulic control check valve 71, a second hydraulic control check valve 711, a first overflow valve 72, a second overflow valve 721, a first two-position three-way electric control valve 73, a second two-position three-way electric control valve 731, a check valve 74 and a two-position four-way electric control valve 75; a T port of the control valve group 7 is communicated with a Q port; one end of the first hydraulic control one-way valve 71 is connected with the port A, the other end of the first hydraulic control one-way valve 71 is connected with the port T, and a control port of the first hydraulic control one-way valve 71 is connected with the port N; one end of a second hydraulic control one-way valve 711 is connected with the port B, the other end of the second hydraulic control one-way valve 711 is connected with the port T, and a control port of the second hydraulic control one-way valve 711 is connected with the port N; one end of the first overflow valve 72 is connected with the port R, and the other end of the first overflow valve 72 is connected with the port T so as to control the maximum pressure of the port R; one end of the second overflow valve 721 is connected to the port P, and the other end of the second overflow valve 721 is connected to the port T to control the maximum pressure of the port P; three connecting ports of the first two-position three-way electric control valve 73 are respectively connected with the R port, the T port and the N port; three connecting ports of the second two-position three-way electric control valve 731 are respectively connected with the R port, the T port and the N port; three connectors of the two-position four-way electric control valve 75 are respectively connected with the port P, the port T and the port Q, and a one-way valve 74 is additionally arranged between the other connector of the two-position four-way electric control valve 75 and the port R.

The utility model discloses a working process:

1. the steering axle is in a normal steering state:

the first two-position three-way electric control valve 73 is powered off, high-pressure oil of the energy accumulator 8 passes through an N port of the first two-position three-way electric control valve 73, the first hydraulic control one-way valve 71 and the second hydraulic control one-way valve 711 are opened by the high pressure of the N port, the large cavity and the small cavity of the steering oil cylinder 4 are communicated with the oil tank 12, and the steering oil cylinder is in a follow-up state; the hydraulic control one-way valve in the locking valve group 5 is opened by the N ports at high pressure, and high-pressure oil enters a large cavity and a small cavity of the locking oil cylinder 6 to promote the locking oil cylinder 6 to move to a middle position and be locked;

2. the locking working state of the steering axle is as follows:

the first two-position three-way electric control valve 73 is electrified, the N port of the first two-position three-way electric control valve 73 is communicated with the oil tank 12, and the first hydraulic control one-way valve 71 and the second hydraulic control one-way valve 711 are closed; the first two-position three-way electric control valve 73 is electrified, the second two-position three-way electric control valve 731 is electrified simultaneously, high-pressure oil of the energy accumulator 8 enters the X port, the hydraulic control one-way valve in the locking valve group 5 is opened, the large cavity and the small cavity of the locking oil cylinder 6 are both communicated with the oil tank 12 at the moment, and the locking oil cylinder 6 is in a follow-up state.

3. The oil charging state of the energy accumulator is as follows:

the two-position four-way electric control valve 75 is powered off, and the port P and the port T of the control valve group 7 are communicated; when the pressure of the energy accumulator 8 is lower than a certain limit value, the two-position four-way electric control valve 75 is electrified, and the port P of the control valve group 7 charges the energy accumulator 8 with oil through the check valve 74; when the pressure of the accumulator 8 exceeds a certain limit value, the two-position four-way electric control valve 75 is powered off.

Claims

1. An electronically controlled steering system of a steering axle, characterized in that: comprising a motor (1), a full hydraulic steering gear (2), a steering axle (3), a steering oil cylinder (4), a locking valve group (5), Locking oil cylinder (6), control valve group (7), accumulator (8), first drive motor (9), second drive motor (91), first hydraulic pump (10), second hydraulic pump ( 101), filter (11), fuel tank (12) and reducer (13);

The input end of the reducer (13) is connected with the motor (1), and the output end of the reducer (13) is connected with the full hydraulic steering gear (2); the oil inlet of the full hydraulic steering gear (2) is connected with the second hydraulic pump ( 101), the oil return port of the full hydraulic steering gear (2) is connected to the oil tank (12) through the oil pipe through the filter (11), and the L and R ports of the full hydraulic steering gear (2) are connected to the steering cylinder. The oil inlet P of the control valve group (7) is connected with the first hydraulic pump (10), and the oil return port T of the control valve group (7) is connected with the oil tank (12) through the filter (11) , the A and B ports of the control valve group (7) are respectively connected with the large and small cavities of the steering cylinder (4), and the N, X and Q ports of the control valve group (7) are respectively connected with the locking valve group (5) ) of the N port, X port and T port are connected, the R port of the control valve group (7) is connected with the accumulator (8); the A port, B port and T1 port of the lock valve group (5) are respectively connected with the lock The large cavity, the small cavity and the oil return cavity of the oil cylinder (6) are connected; the first hydraulic pump (10) and the second hydraulic pump (101) are respectively driven by the first driving motor (9) and the second driving motor (91), The oil inlets of the first hydraulic pump (10) and the second hydraulic pump (101) are both connected to the oil tank (12).

2. The electronically controlled steering system of a steering axle according to claim 1, characterized in that: the full hydraulic steering gear (2) is driven by the motor (1) through the reducer (13), and is driven by the control motor ( 1) The rotation angle is then used to control the rotation angle of the wheels on the steering axle (3); or the fully hydraulic steering gear (2) is directly driven by the motor (1).

3. The electronically controlled steering system of a steering axle according to claim 1, wherein the large cavity and the small cavity of the steering cylinder (4) on the steering axle (3) pass through the oil pipe and the control valve group (7) are connected, and when the locking oil cylinder (6) is locked, the large cavity and the small cavity of the steering oil cylinder (4) are directly communicated with the oil tank (12).

4. The electronically controlled steering system of a steering axle according to claim 1, characterized in that: the accumulator (8) is connected with the control valve group (7), and the pressure of the accumulator (8) is changed to control the first Whether the hydraulic pump (10) fills the accumulator with oil, at this time the first driving motor (9) can work intermittently in the form of electric control; or the R port of the control valve group (7) is sealed, and the first hydraulic pump ( 10) Always in operation.

5. The electronically controlled steering system of a steering axle according to claim 1, characterized in that: the steering axle (3) is provided with two steering oil cylinders (4) and a locking oil cylinder (6); or One or more steering oil cylinders (4) and a locking oil cylinder (6) are installed on the steering axle (3); or a combined oil cylinder with steering and locking functions is installed on the steering axle (3).

6 . The electronically controlled steering system of a steering axle according to claim 1 , wherein the control valve group ( 7 ) further comprises a first hydraulic control check valve ( 71 ), a second hydraulic control check valve ( 71 ). Directional valve (711), first relief valve (72), second relief valve (721), first 3/2-way electric control valve (73), second 3/2-way electric control valve (731), One-way valve (74) and two-position four-way electric control valve (75); the T port of the control valve group (7) is connected with the Q port; one end of the first hydraulic control check valve (71) is connected with the A port, and the first The other end of the first hydraulic control check valve (71) is connected to the T port, the control port of the first hydraulic control check valve (71) is connected to the N port; one end of the second hydraulic control check valve (711) is connected to the B port The other end of the second hydraulic control check valve (711) is connected to the T port, the control port of the second hydraulic control check valve (711) is connected to the N port; one end of the first overflow valve (72) is connected to the R port The other end of the first relief valve (72) is connected to the T port to control the maximum pressure of the R port; one end of the second relief valve (721) is connected to the P port, and the second relief valve (721) The other end of the valve is connected to the T port to control the maximum pressure of the P port; the three connection ports of the first two-position three-way electric control valve (73) are connected to the R port, the T port and the N port respectively; The three connection ports of the electric control valve (731) are respectively connected with the R port, the T port and the N port; the three connection ports of the two-position four-way electric control valve 75 are respectively connected with the P port, the T port and the Q port. A check valve (74) is added between the other connection port of the four-way electric control valve 75 and the R port.

7. The electronically controlled steering system of a steering axle according to claim 6, characterized in that: the two-position four-way electronically controlled valve (75) is powered off, and the P port and the T port are connected; The four-position electric control valve (75) is energized, and the P port is filled with oil through the check valve (74); the first two-position three-way electric control valve (73) is de-energized, and the accumulator (8) is high-pressure oil The first hydraulic control check valve (71) and the second hydraulic control check valve (711) are opened at high pressure through the N port of the first two-position three-way electric control valve (73), and the large cavity of the steering cylinder (4) is turned on. It is connected with the small cavity and the oil tank (12); the high pressure of the N port opens the hydraulic control check valve in the locking valve group (5), and the high-pressure oil enters the large cavity and the small cavity of the locking oil cylinder (6), which promotes the locking oil cylinder ( 6) Move to the neutral position and lock; the first two-position three-way electric control valve (73) is energized, the N port of the first two-position three-way electric control valve (73) is connected with the oil tank (12), and the first hydraulic control valve (73) is connected to the fuel tank (12). The check valve (71) and the second hydraulic control check valve (711) are closed; the first two-position three-way electric control valve (73) is energized, and the second two-position three-way electric control valve (731) is energized at the same time, The high-pressure oil of the accumulator (8) enters the X port, and the hydraulic control check valve in the locking valve group (5) is opened. At this time, the large cavity and the small cavity of the locking oil cylinder (6) are connected with the oil tank (12), The locking oil cylinder (6) is in a follow-up state.