Emergency steering system of electric drive chassis

Abstract

The invention relates to a vehicle structure, in particular to an emergency steering system of an electric drive chassis, which comprises a first hydraulic pump, a high-voltage power supply, a low-voltage power supply, a second hydraulic pump, an oil source, a first oil inlet pipeline, a second oil inlet pipeline, a first oil return pipeline, a third oil inlet pipeline, a second oil return pipeline and an oil distribution safety valve, the first hydraulic pump is connected with a high-voltage power source and a low-voltage power source, the low-voltage power source supplies power when power supply of the high-voltage power source fails, the second hydraulic pump is connected to a non-driving wheel, the first oil inlet pipeline is connected between an oil source and a P1 control port of the oil distribution safety valve, the first hydraulic pump is arranged on the first oil inlet pipeline, and the second oil inlet pipeline is connected between the oil source and a P2 port. And the second hydraulic pump is arranged on the second oil inlet pipeline. When the power supply of the first hydraulic pump fails and the vehicle is still in a running state, steering hydraulic power can be provided for the vehicle, particularly, when the power supply of the electric drive chassis fails and the vehicle needs to be towed, the steering hydraulic power can still be provided for the vehicle, and consignment is more convenient.

Description

Technical Field

[0001] The invention relates to a vehicle structure, in particular to an emergency steering system of an electric drive chassis. Background Art

[0002] With the development and progress of society, multi-axle heavy-duty special vehicles are playing an increasingly important role in the fields of engineering machinery, national defense, etc. As an actuator that controls the direction of the vehicle according to the driver's wishes, the reliability of the steering system plays a vital role in driving safety. Due to the characteristics of axle loads of multi-axle heavy-duty special vehicles, the steering system generally uses hydraulic power assistance. The multi-axle ultra-heavy electric drive chassis realizes oil supply through an electric hydraulic pump, which is usually driven by high-voltage electricity. However, the multi-axle ultra-heavy electric drive chassis has a high-voltage power failure or low-voltage power failure failure mode. Once a power failure occurs, the steering system that uses an electric hydraulic pump (main pump) to supply oil will lose its power-assist function, thereby affecting the safe driving of the vehicle.

[0003] In order to eliminate the above-mentioned hidden dangers in the steering system of a multi-axle super-heavy electric drive chassis, a steering system scheme with emergency function is proposed to improve the driving safety performance of the multi-axle super-heavy electric drive chassis. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an emergency steering system for an electric drive chassis which can still provide steering hydraulic assistance to the vehicle and improve the driving safety of the vehicle when a power supply failure occurs in the first hydraulic pump.

[0005] In order to solve the above technical problems, this application provides the following technical solutions:

[0006] The emergency steering system of the electric drive chassis of the present invention comprises a steering gear, the electric drive chassis comprises a non-driven wheel, and also comprises a first hydraulic pump, a high-voltage power supply, a low-voltage power supply, a second hydraulic pump, an oil source, a first oil inlet pipeline, a second oil inlet pipeline, a first oil return pipeline, a third oil inlet pipeline, a second oil return pipeline, and an oil distribution safety valve. The first hydraulic pump is a dual-source motor hydraulic pump. The first hydraulic pump is connected to the high-voltage power supply and the low-voltage power supply. When the high-voltage power supply fails, the first hydraulic pump switches to a low-voltage working mode and is powered by the low-voltage power supply. The second hydraulic pump is connected to the non-driven wheel. The rotation of the non-driven wheel drives the second hydraulic pump to work. One end of the first oil inlet pipeline is connected to the The first hydraulic pump is arranged on the first oil inlet pipeline, one end of the second oil inlet pipeline is connected to the oil source, and the other end is connected to the P2 control port of the oil distribution safety valve, the second hydraulic pump is arranged on the second oil inlet pipeline, one end of the first oil return pipeline is connected to the O port of the oil distribution safety valve, and the other end is connected to the oil source, one end of the third oil inlet pipeline is connected to the A port of the oil distribution safety valve, and the other end is connected to the A port of the steering gear, one end of the second oil return pipeline is connected to the B port of the steering gear, and the other end is connected to the oil source, and the steering gear is hydraulically connected to the follower to provide steering hydraulic assistance together.

[0007] Furthermore, it also includes a first filter and a second filter, and the first filter and the second filter are respectively arranged on the first oil inlet pipeline and the second oil inlet pipeline.

[0008] Furthermore, it also includes a third filter, which is arranged on the first oil return pipeline.

[0009] Furthermore, it also includes a first one-way valve and a second one-way valve, and the first one-way valve and the second one-way valve are respectively arranged on the first oil inlet pipeline and the second oil inlet pipeline.

[0010] Furthermore, it also includes a third one-way valve, which is arranged on the first oil return pipeline.

[0011] Furthermore, the input end of the second hydraulic pump is provided with an external spline, the non-driving wheel is provided with a driving end, the driving end is provided with an internal spline, and the input end of the second hydraulic pump is connected to the driving end of the non-driving wheel via a spline.

[0012] Furthermore, the input shaft of the second hydraulic pump is connected to the driving end of the non-driving wheel via a plurality of bolts.

[0013] Furthermore, it also includes a DC / AC converter, and the first hydraulic pump is connected to the high-voltage power supply through the DC / AC converter.

[0014] Furthermore, the second hydraulic pump is a fixed displacement pump.

[0015] Furthermore, it also includes a steering wheel, a steering transmission shaft and an angular transmission, a transverse tie rod, a left steering swing arm, a left side tie rod, a left trapezoidal arm, a left wheel set, a right steering swing arm, a right side tie rod, a right trapezoidal arm, and a right wheel set. When the vehicle turns, the steering wheel transmits the steering intention to the input end of the steering gear via the steering transmission shaft and the angular transmission, and the steering gear and the follower respectively drive the left steering swing arm and the right steering swing arm to rotate, the right steering swing arm is connected to the left steering swing arm through the transverse tie rod, the right side tie rod is connected to the right steering swing arm and the right trapezoidal arm, and the left side tie rod is connected to the left steering swing arm and the left trapezoidal arm

[0016] Compared with the prior art, the emergency steering system of the electric drive chassis of the present invention has at least the following beneficial effects:

[0017] The present invention discloses an emergency steering system for an electric drive chassis. The system includes a high-voltage power supply and a low-voltage power supply. The first hydraulic pump is a dual-source motor hydraulic pump. When the high-voltage power supply fails during driving, the first hydraulic pump is powered by the low-voltage power supply. The first hydraulic pump can continue to work for no less than two minutes under low-voltage emergency conditions, thereby providing safety protection for the driver's steering assistance needs under emergency conditions. At the same time, the present invention also includes a second hydraulic pump and an oil distribution safety valve. The second hydraulic pump is connected to a non-driving wheel, and the first hydraulic pump and the second hydraulic pump are respectively connected to the two ends of the oil distribution safety valve. A control port is provided on the second hydraulic pump, so when both the high-voltage power supply and the low-voltage power supply of the first hydraulic pump fail, as long as the vehicle is still in driving state, the second hydraulic pump installed on the non-driving wheel can follow the rotation of the wheel to provide the vehicle with steering hydraulic power-assisting oil source power, thereby ensuring the driving safety of the electric drive chassis vehicle under high-voltage and low-voltage power failure conditions, thereby improving the driving safety of the vehicle. In particular, when the electric drive chassis is in the state of power failure and needs to be towed, it can still provide the vehicle with steering hydraulic power-assisting and improve the convenience of shipping. When the first hydraulic pump is working normally, the second hydraulic pump does not participate in the steering power-assisting and the system generates less heat.

[0018] The emergency steering system of the electric drive chassis of the present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a hydraulic principle diagram of the emergency steering system of the electric drive chassis of the present invention;

[0020] Figure 2 It is a schematic diagram of the overall steering principle structure of the emergency steering system of the electric drive chassis of the present invention;

[0021] Figure 3 It is a schematic diagram of the installation three-dimensional structure of the second hydraulic pump in the emergency steering system of the electric drive chassis of the present invention;

[0022] Figure 4 It is a schematic diagram of the installation structure of the second hydraulic pump in the emergency steering system of the electric drive chassis of the present invention from a side view;

[0023] Figure 5 for Figure 4 A partial enlarged view of . DETAILED DESCRIPTION

[0024] like Figure 1 , Figure 2 As shown, an emergency steering system of an electric drive chassis of the present invention comprises a steering wheel and a transmission shaft mechanism, a steering rod mechanism, a steering electrical device, and a steering hydraulic mechanism, wherein the steering hydraulic mechanism comprises a steering gear 31, and the electric drive chassis comprises a non-driven wheel 32, and further comprises a first hydraulic pump 11, a high-voltage power supply, a low-voltage power supply, a second hydraulic pump 12, an oil source 13, a first oil inlet pipeline 21, a second oil inlet pipeline 22, a first oil return pipeline 23, a third oil inlet pipeline 24, a second oil return pipeline 25, and an oil distribution safety valve 41. The first hydraulic pump 11 is a dual-source motor hydraulic pump, and is provided with a high-voltage working module and a low-voltage emergency module. The first hydraulic pump 11 is connected to a high-voltage power supply and a low-voltage power supply. When the high-voltage power supply fails, the first hydraulic pump 11 automatically switches to a low-voltage working mode and is powered by a low-voltage power supply. The second hydraulic pump 12 is connected to the non-driven wheel 32, and the non-driven wheel 32 rotates with The second hydraulic pump 12 is driven to supply oil, one end of the first oil inlet pipeline 21 is connected to the oil source 13, and the other end is connected to the P1 control port of the oil distribution safety valve 41. The first hydraulic pump 11 is arranged on the first oil inlet pipeline 21, one end of the second oil inlet pipeline 22 is connected to the oil source 13, and the other end is connected to the P2 control port of the oil distribution safety valve 41. The second hydraulic pump 12 is arranged on the second oil inlet pipeline 22, one end of the first oil return pipeline 23 is connected to the O port of the oil distribution safety valve 41, and the other end is connected to the oil source 13, one end of the third oil inlet pipeline 24 is connected to the A port of the oil distribution safety valve 41, and the other end is connected to the A port of the steering gear 31, one end of the second oil return pipeline 25 is connected to the B port of the steering gear 31, and the other end is connected to the oil source 13, the steering gear 31 is also connected to the follower 33, the C port of the steering gear 31 is connected to the B port end of the follower 33, and the D port of the steering gear 31 is connected to the A port end of the follower 33.

[0025] The present invention discloses an emergency steering system for an electric drive chassis. The steering wheel and transmission shaft mechanism mainly include a steering wheel, a steering transmission shaft and an angle transmission device. One end of the steering transmission shaft is connected to the steering wheel, and the other end is connected to the steering gear. The angle transmission device is used to realize the switching in the middle. The steering rod system mechanism mainly includes a transverse tie rod, a left steering swing arm, a left side tie rod, a left trapezoidal arm, a left wheel set, a right steering swing arm, a right side tie rod, a right trapezoidal arm, and a right wheel set. The right trapezoidal arm and the left trapezoidal arm are respectively installed on the right wheel set and the left wheel set. The vehicle steering of the electric drive chassis When the steering wheel is turned, it transmits the driver's intention to the steering gear input end via the steering transmission shaft and the angle transmission; the steering gear and followers arranged on both sides of the frame drive the left steering swing arm and the right steering swing arm to rotate through hydraulic power; the steering swing arms on the left and right sides are connected by a tie rod to ensure that the left and right steering wheels meet the ideal movement relationship; the right side tie rod is used to connect the right steering swing arm and the right trapezoidal arm, and the left side tie rod is used to connect the left steering swing arm and the left trapezoidal arm; the driver manipulates the steering rod system to move in space, thereby driving the wheel to turn. The steering system of the present invention is a disconnected trapezoidal structure steering system, which can be used in conjunction with an independent suspension, and adopts a circulating ball power steering gear and a follower to provide steering assistance, especially being able to meet the steering assistance requirements of the chassis of super-heavy special vehicles with double front axle loads not exceeding 26 tons.

[0026] When the high-voltage power supply is normally supplied to the first hydraulic pump 11 and the first hydraulic pump 11 works normally, and when the high-voltage power supply fails and the first hydraulic pump 11 works in the low-pressure emergency mode, the hydraulic oil enters the A port of the steering gear 31 from the oil source through the first oil inlet pipeline 21, the P1 port of the oil distribution safety valve 41, and the A port of the oil distribution safety valve. When the steering gear 31 is in the middle position, that is, not steering, the high-pressure oil is unloaded from the B port through the H-type middle position function of the steering gear 31; when turning left, the high-pressure oil flows from the A port of the steering gear 31 through the D port into the B port of the follower 33, driving the output shaft of the follower 33 to rotate, and returns the oil through the A port of the follower 33, the C port of the steering gear 31, and the second oil return pipeline 25, and assists the steering. Under this working condition, the hydraulic oil sucked into the second oil inlet pipeline 22 by the second hydraulic pump 12 is directly unloaded and returned to the oil source 13 through the O port of the oil distribution safety valve 21, and does not participate in the steering assistance, thereby reducing the heat generated by the system;

[0027] When both the high-voltage power supply and the low-voltage power supply fail, the first hydraulic pump 11 loses its oil supply capability and the vehicle is still in motion, the non-driven wheel set 32 ​​serves as a power source, and the rotation of the non-driven wheel set 32 ​​drives the input shaft of the second hydraulic pump 12 to rotate and generate high-pressure oil, which flows to the oil distribution safety valve 41 through the second oil inlet pipeline 22. Since the main circuit provided by the first hydraulic pump 11 with a high-pressure oil source is in a failed state at this time, the high-pressure oil source provided by the second hydraulic pump 12 opens the one-way valve of the oil distribution safety valve 41 and provides high-pressure oil to the steering gear 31 and the follower 33 as a power source to realize the emergency steering function and power steering. The process of the second hydraulic pump 12 controlling the follower 33 to turn left or right through the steering gear 31 is the same as that of the first hydraulic pump 11. When the vehicle stops and the non-driven wheel set 32 ​​stops rotating, the second hydraulic pump 12 stops supplying oil, and the steering hydraulic device stops steering assistance.

[0028] The present invention discloses an emergency steering system for an electric drive chassis. The system includes a high-voltage power supply and a low-voltage power supply. The first hydraulic pump 11 is a dual-source motor hydraulic pump. When a high-voltage power supply fails during driving, the first hydraulic pump 11 is powered by the low-voltage power supply. The first hydraulic pump 11 can continue to work for no less than two minutes under low-voltage emergency conditions, thereby providing safety protection for the driver's steering assistance needs under emergency conditions. At the same time, the present invention also includes a second hydraulic pump 12 and an oil distribution safety valve 41. The second hydraulic pump 12 is connected to the non-driving wheel 32, and the first hydraulic pump 11 and the second hydraulic pump 12 are respectively connected to the oil distribution safety valve 41. On the two control ports of the valve 41, therefore, when both the high-voltage power supply and the low-voltage power supply of the first hydraulic pump 11 fail, as long as the vehicle is still in driving state, the second hydraulic pump 12 installed on the non-driving wheel 32 can follow the rotation of the wheel to provide the vehicle with steering hydraulic power oil source power, thereby ensuring the driving safety of the electric drive chassis vehicle under high-voltage and low-voltage power failure conditions, thereby improving the driving safety of the vehicle. In particular, when the electric drive chassis is in a power failure and needs to be towed, it can still provide the vehicle with steering hydraulic power and improve the convenience of shipping. When the first hydraulic pump 11 is working, the second hydraulic pump 12 does not participate in the steering power, and the system heat generation is relatively low.

[0029] Optionally, the second hydraulic pump 12 is a fixed displacement pump, and the flow rate provided by the second hydraulic pump 12 will gradually decrease as the rotation speed of the non-driven wheel set 32 ​​decreases.

[0030] Optionally, an emergency steering system of an electric drive chassis of the present invention further includes a first filter 42, a second filter 43, and a third filter 44. The first filter 42, the second filter 43, and the third filter 44 are respectively arranged on the first oil inlet pipeline 21, the second oil inlet pipeline 22, and the first oil return pipeline 23 to reduce impurities in the oil circuit.

[0031] Optionally, an emergency steering system of an electric drive chassis of the present invention further includes a first one-way valve 45, a second one-way valve 46, and a third one-way valve 47. The first one-way valve 45, the second one-way valve 46, and the third one-way valve 47 are respectively arranged on the first oil inlet pipeline 21, the second oil inlet pipeline 22, and the first oil return pipeline 23, and multiple one-way valves are used to prevent oil backflow in the oil circuit.

[0032] Alternatively, if Figure 3 , Figure 4 , Figure 5 As shown, an external spline is provided on the input shaft of the second hydraulic pump 12, a driving end is provided on the non-driving wheel 32, and an internal spline is provided on the driving end. The input shaft of the second hydraulic pump 12 is provided in the driving end and the input shaft and the driving end are connected by splines. The rotation of the non-driving wheel 32 drives the second hydraulic pump 12 to work and generate high-pressure oil.

[0033] Optionally, the input shaft of the second hydraulic pump 12 is further connected to the driving end of the non-driving wheel 32 via a plurality of bolts, so as to improve the connection strength between the second hydraulic pump 12 and the non-driving wheel 32 .

[0034] Optionally, the emergency steering system of an electric drive chassis of the present invention further includes a DC / AC converter, and the first hydraulic pump 11 is connected to a high-voltage power supply through the DC / AC converter. When the high voltage of the electric drive chassis is powered on, the high-voltage power supply performs voltage conversion through the DC / AC converter to supply power to the high-voltage working module of the first hydraulic pump 11.

[0035] The embodiments described above are merely descriptions of preferred implementation modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An emergency steering system for an electric drive chassis, comprising a steering gear (31), the electric drive chassis comprising a non-driving wheel (32), characterized in that: The invention also comprises a first hydraulic pump (11), a high-voltage power supply, a low-voltage power supply, a second hydraulic pump (12), an oil source (13), a first oil inlet pipeline (21), a second oil inlet pipeline (22), a first oil return pipeline (23), a third oil inlet pipeline (24), a second oil return pipeline (25), and an oil distribution safety valve (41). The first hydraulic pump (11) is a dual-source motor hydraulic pump. The first hydraulic pump (11) is connected to the high-voltage power supply and the low-voltage power supply. When the high-voltage power supply fails, the first hydraulic pump (11) switches to a low-voltage working mode and is powered by the low-voltage power supply. The second hydraulic pump (12) is connected to the non-driving wheel (32). The rotation of the non-driving wheel (32) drives the second hydraulic pump (12) to work. One end of the first oil inlet pipeline (21) is connected to the oil source (13), and the other end is connected to the oil distribution safety valve (41). The first hydraulic pump (11) is arranged on the first oil inlet pipeline (21); one end of the second oil inlet pipeline (22) is connected to the oil source (13) and the other end is connected to the P2 control port of the oil distribution safety valve (41); the second hydraulic pump (12) is arranged on the second oil inlet pipeline (22); one end of the first oil return pipeline (23) is connected to the O port of the oil distribution safety valve (41) and the other end is connected to the oil source (13); one end of the third oil inlet pipeline (24) is connected to the A port of the oil distribution safety valve (41) and the other end is connected to the A port of the steering gear (31); one end of the second oil return pipeline (25) is connected to the B port of the steering gear (31) and the other end is connected to the oil source (13); the steering gear (31) is connected to the follower (33) to provide steering hydraulic assistance together.

2. The emergency steering system of the electric drive chassis according to claim 1, characterized in that: It also includes a first filter (42) and a second filter (43), wherein the first filter (42) and the second filter (43) are respectively arranged on the first oil inlet pipeline (21) and the second oil inlet pipeline (22).

3. The emergency steering system of the electric drive chassis according to claim 2, characterized in that: It also includes a third filter (44), wherein the third filter (44) is arranged on the first oil return pipeline (23).

4. The emergency steering system of the electric drive chassis according to claim 3, characterized in that: It also includes a first one-way valve (45) and a second one-way valve (46), wherein the first one-way valve (45) and the second one-way valve (46) are respectively arranged on the first oil inlet pipeline (21) and the second oil inlet pipeline (22).

5. The emergency steering system of the electric drive chassis according to claim 4, characterized in that: It also includes a third one-way valve (47), which is arranged on the first oil return pipeline (23).

6. The emergency steering system of the electric drive chassis according to claim 5, characterized in that: The input end of the second hydraulic pump (12) is provided with an external spline, the non-driving wheel (32) is provided with a driving end, the driving end is provided with an internal spline, and the input end of the second hydraulic pump (12) is connected to the driving end of the non-driving wheel (32) via a spline.

7. The emergency steering system of the electric drive chassis according to claim 6, characterized in that: The input shaft of the second hydraulic pump (12) is connected to the driving end of the non-driving wheel (32) via a plurality of bolts.

8. The emergency steering system of the electric drive chassis according to claim 7, characterized in that: It also includes a DC / AC converter, and the first hydraulic pump (11) is connected to the high-voltage power supply through the DC / AC converter.

9. The emergency steering system of the electric drive chassis according to claim 8, characterized in that: The second hydraulic pump (12) is a fixed displacement pump.

10. The emergency steering system of the electric drive chassis according to claim 9, characterized in that: It also includes a steering wheel, a steering transmission shaft and an angle transmission, a transverse tie rod, a left steering swing arm, a left side tie rod, a left trapezoidal arm, a left wheel group, a right steering swing arm, a right side tie rod, a right trapezoidal arm, and a right wheel group. When the vehicle turns, the steering wheel transmits the steering intention to the input end of the steering gear (31) via the steering transmission shaft and the angle transmission. The steering gear (31) and the follower (33) respectively drive the left steering swing arm and the right steering swing arm to rotate. The right steering swing arm is connected to the left steering swing arm through the transverse tie rod. The right side tie rod is connected to the right steering swing arm and the right trapezoidal arm. The left side tie rod is connected to the left steering swing arm and the left trapezoidal arm.

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