Pneumatic clutch pump with emergency steering function and control method

Abstract

The present invention discloses a pneumatic clutch pump with an emergency steering function and a control method. The pneumatic clutch pump includes a pneumatic clutch and a variable displacement pump. The pneumatic clutch includes a clutch outer drive shaft and a clutch inner drive shaft. The variable displacement pump is provided with a pump shaft. The clutch outer drive shaft is connected to a gearbox, and the clutch inner drive shaft is connected to a pump shaft. A clutch disc is provided between the clutch outer drive shaft and the clutch inner drive shaft. When the pneumatic clutch is de-energized, the clutch disc is engaged, and the clutch outer drive shaft and the clutch inner drive shaft are in transmission connection. When the pneumatic clutch is energized, the clutch disc is disengaged, and the clutch outer drive shaft and the clutch inner drive shaft are released from transmission connection. The present invention solves the problems of high fuel consumption and lack of redundant steering safety records for conventional vehicles or hybrid commercial vehicles when traveling at high speeds.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile steering, and in particular relates to a steering pump. Background Art

[0002] As the country's requirements for automobile steering safety become increasingly higher, and commercial vehicles are becoming more and more popular in densely populated cities, with the application of unmanned driving and wire-controlled steering, the cost of electronic control integration of hydraulic emergency steering is relatively high.

[0003] There are two main hidden dangers in the use of traditional cars and hybrid cars:

[0004] 1. There is currently no redundant record of steering safety. In other words, when the vehicle engine fails or the oil pump loses power transmission, the steering wheel loses power steering, and the sudden change in the power steering feel is prone to safety accidents.

[0005] 2. When the vehicle is traveling at high speed, the economy of steering and the cost of emergency response are not as high as those of existing mechanical products. Summary of the Invention

[0006] In view of the defects of the existing technology, the technical problem to be solved by the present invention is to provide a pneumatic clutch pump and control method with emergency steering function to solve the problems of high fuel consumption and lack of redundant steering safety records when traditional cars or hybrid commercial vehicles are driving at high speeds.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] On the one hand, a pneumatic clutch pump with an emergency steering function is provided, the pneumatic clutch pump comprising a pneumatic clutch and a variable displacement pump, the pneumatic clutch comprising a clutch outer transmission shaft and a clutch inner transmission shaft, the variable displacement pump being provided with a pump shaft, the clutch outer transmission shaft being connected to a gearbox, the clutch inner transmission shaft being connected to a pump shaft, and a clutch disc being provided between the clutch outer transmission shaft and the clutch inner transmission shaft;

[0009] When the pneumatic clutch is not ventilated, the clutch disc is in an engaged state, and the clutch outer transmission shaft and the clutch inner transmission shaft are in transmission connection; when the pneumatic clutch is ventilated, the clutch disc is in a disengaged state, and the clutch outer transmission shaft and the clutch inner transmission shaft are released from transmission connection.

[0010] Preferably, the clutch disc includes a friction plate and a wave pad, the friction plate is connected to the outer transmission shaft of the clutch, and the wave pad is connected to the inner transmission shaft of the clutch. When the pneumatic clutch is not ventilated, the friction plate and the wave pad are in transmission connection.

[0011] Preferably, the pneumatic clutch is provided with a piston, and the piston is connected to a gas nozzle for introducing gas. After the gas is introduced, the piston pushes the wave pad to move away from the friction plate, so that the wave pad is separated from the friction plate.

[0012] Preferably, the pneumatic clutch is further provided with a secondary clutch disc, a sliding bearing and a pull rod, the secondary clutch disc is connected to the sliding bearing, the pull rod connects the secondary clutch disc and the piston, and the wave pad is provided on the secondary clutch disc.

[0013] Preferably, the clutch outer transmission shaft is provided with a main clutch disc at one end inside the clutch housing, and the friction plate is provided on the main clutch disc.

[0014] Preferably, the pneumatic clutch pump is further provided with a speed sensor, and the main clutch disc is provided with a gear. The speed sensor monitors the speed of the gear in real time and sends an alarm signal when the speed of the speed sensor is 0.

[0015] Preferably, a first bearing is provided between the clutch outer transmission shaft and the clutch housing, the clutch outer transmission shaft is provided with an outer transmission shaft hole at one end inside the clutch housing, a second bearing is installed in the outer transmission shaft hole, and the first end of the clutch inner transmission shaft is provided in the outer transmission shaft hole and is rotatably supported on the second bearing.

[0016] Preferably, an inner transmission shaft hole is provided at the end portion of the second end of the inner transmission shaft of the clutch, and a transmission part is provided at the end portion of the pump shaft, and the transmission part is connected to the inner transmission shaft hole for transmission.

[0017] On the other hand, a method for controlling a pneumatic clutch pump with an emergency steering function is provided. The pneumatic clutch pump is controlled so that when the vehicle speed exceeds a set speed, the clutch outer drive shaft and the clutch inner drive shaft are connected and drive the pump shaft to rotate, and the variable displacement pump provides oil power steering.

[0018] When the vehicle speed is lower than the set speed, the clutch outer drive shaft and the clutch inner drive shaft release the transmission connection, the variable pump stops outputting, and the engine oil pump is switched to provide oil power steering.

[0019] Preferably, the set speed is 30 km / h.

[0020] The technical solution adopted by the present invention adopts a combination of an oil pump and a pneumatic clutch to provide steering assistance to the entire vehicle. The oil pump adopts a variable displacement pump, wherein the power source is provided by the transmission of the gearbox.

[0021] Therefore, it has the following beneficial effects:

[0022] Two power sources can be provided for steering, namely the original engine steering power source and the transmission power source, so as to greatly ensure the safety of steering.

[0023] At high speeds, a variable displacement pump can be used to provide hydraulic power steering. As the pump's speed increases, the eccentric force on its internal stator increases. This eccentric force reduces the pump's internal displacement, resulting in a constant flow output. Because the variable displacement pump generates less heat, it conforms to the design principle of decreasing heat generation with increasing speed, which improves fuel economy for the vehicle.

[0024] In addition, when the pneumatic clutch is in use, it is separated when ventilated, and the clutch plate is in the engaged state (i.e. the maximum torque state) when it is not ventilated. When the vehicle loses the air source, the pneumatic clutch can also ensure the safety and reliability of steering.

[0025] The specific technical solutions of the present invention and the beneficial effects thereof will be disclosed in detail in the following specific embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0027] Figure 1 It is a structural schematic diagram of the pneumatic clutch pump of the present invention;

[0028] In the figure: 1-friction plate, 2-wave pad, 3-speed sensor, 4-sliding bearing, 5-piston, 6-air nozzle, 7-clutch housing, 8-clutch outer transmission shaft, 9-clutch inner transmission shaft, 10-variable pump, 101-pump shaft, 11-first bearing, 12-second bearing. DETAILED DESCRIPTION

[0029] The following is an explanation and description of the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. However, the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0030] Those skilled in the art will appreciate that, unless there is any conflict, the features in the following embodiments and implementations may be combined with each other.

[0031] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. For example, the terms "inside" and "outside" used below to indicate orientation or positional relationships are based solely on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the disclosure. They do not indicate or imply that the device or component referred to must have a specific orientation or be constructed or operated in a specific orientation. Therefore, they should not be construed as limiting the disclosure.

[0032] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," and "fixed" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0033] The technical solution adopted in the embodiment of the present invention adopts a combination of an oil pump and a pneumatic clutch to provide steering assistance to the entire vehicle, wherein the power source is provided by the transmission of the gearbox, and the maximum speed is 0-6500rpm, which exceeds the speed point (0-4500rpm) of the traditional vehicle engine-driven steering oil pump assistance. When the vehicle speed exceeds 30km / h, the pneumatic clutch pump is switched to provide steering assistance, providing a steering assistance hydraulic source for the entire vehicle.

[0034] like Figure 1 As shown, this embodiment provides a pneumatic clutch pump with an emergency steering function, which can coordinate with the engine oil pump to provide oil-assisted steering. The pneumatic clutch pump includes a pneumatic clutch and a variable pump 10. The pneumatic clutch includes a clutch housing 7, a clutch outer transmission shaft 8, and a clutch inner transmission shaft 9. A first bearing 11 is provided between the clutch outer transmission shaft 8 and the clutch housing 7. The clutch outer transmission shaft 8 is provided with an outer transmission shaft hole at one end inside the clutch housing. A second bearing 12 is installed in the outer transmission shaft hole. The first end of the clutch inner transmission shaft 9 is provided in the outer transmission shaft hole and is rotatably supported by the second bearing 12. The variable pump 10 is provided with a pump shaft 101. The clutch outer transmission shaft 8 is connected to the gearbox. The clutch inner transmission shaft 9 is connected to the pump shaft 101. A clutch disc is provided between the clutch outer transmission shaft 8 and the clutch inner transmission shaft 9. The end of the second end of the clutch inner transmission shaft is provided with an inner transmission shaft hole, and the end of the pump shaft is provided with a transmission part, which is connected to the inner transmission shaft hole for transmission, and can be specifically connected by a spline or a flat key, or other methods of connection and transmission.

[0035] When the pneumatic clutch is not ventilated, the clutch disc is in an engaged state, and the clutch outer transmission shaft and the clutch inner transmission shaft are in transmission connection; when the pneumatic clutch is ventilated, the clutch disc is in a disengaged state, and the clutch outer transmission shaft and the clutch inner transmission shaft are released from transmission connection.

[0036] The control method of the above-mentioned pneumatic clutch pump with emergency steering function is as follows:

[0037] When the vehicle speed is higher than the set speed, the clutch outer drive shaft and the clutch inner drive shaft are connected, driving the pump shaft to rotate, and the variable displacement pump provides oil to assist the steering;

[0038] When the vehicle speed is lower than the set speed, the clutch outer drive shaft and the clutch inner drive shaft release the transmission connection, the variable pump stops outputting, and the engine oil pump is switched to provide oil power steering.

[0039] At high speeds, a variable displacement pump provides hydraulic power steering. As the pump's speed increases, the eccentric force on its internal stator increases. This eccentric force reduces the pump's internal displacement, resulting in a constant flow output. Because the variable displacement pump generates less heat, this design principle, which reduces heat generation as speed increases, improves fuel economy for the vehicle.

[0040] In this embodiment, the clutch plate comprises a friction plate 1 and a wave washer 2. The friction plate is connected to the clutch's outer drive shaft, while the wave washer is connected to the clutch's inner drive shaft. When the pneumatic clutch is de-energized, the friction plate and wave washer are in driving connection. A primary clutch plate is provided at one end of the clutch's outer drive shaft, inside the clutch housing, with the friction plate 1 mounted on the primary clutch plate.

[0041] Furthermore, the pneumatic clutch is equipped with a piston 5 connected to a gas nozzle 6 for introducing gas. When gas is introduced, the piston pushes the wave pad away from the friction plate, disengaging the wave pad from the friction plate. The pneumatic clutch also features a sliding bearing 4, a secondary clutch plate, and a pull rod. The secondary clutch plate is connected to the sliding bearing, and the pull rod connects the secondary clutch plate and the piston. The wave pad is mounted on the secondary clutch plate. The sliding bearing and secondary clutch plate are integral. When 0.6MPa gas is introduced from the gas nozzle, the air chamber expands, the piston moves linearly, and the pull rod connected to the piston also moves, pulling the secondary clutch plate and the sliding bearing to follow. At this point, the wave pad on the secondary clutch plate separates from the friction plate, no torque is transmitted, and the clutch is disengaged.

[0042] Furthermore, a speed sensor is provided. The gear on the main clutch plate is equipped with a magnetic induction probe, which monitors the gear speed in real time, thereby monitoring whether the clutch is slipping. This feedback speed must basically match the transmission speed to ensure that the clutch has not failed. When the clutch is disengaged, it means that the oil pump is not working and the speed is zero. That is, when the pneumatic clutch is ventilated and the clutch plate is disengaged, the speed of the speed sensor is zero. Therefore, the failure of the pneumatic clutch can be monitored in real time to meet the alarm function of the vehicle instrument.

[0043] In this embodiment, the set speed is 30 km / h. At 30 km / h, the maximum oil pump pressure is generally not used, which can easily cause the vehicle to roll over. Therefore, based on multiple tests and evaluations, the maximum variable pump pressure of 12 MPa is just enough for the normal steering requirements of the vehicle at 30 km / h. If the vehicle is stopped, the steering pressure is generally around 15 MPa.

[0044] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art will understand that the present invention includes, but is not limited to, the contents described in the drawings and the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present invention are intended to be included within the scope of the claims.

Claims

1. A pneumatic clutch pump with emergency steering function, characterized in that: The pneumatic clutch pump includes a pneumatic clutch and a variable displacement pump. The pneumatic clutch includes a clutch outer transmission shaft and a clutch inner transmission shaft. The variable displacement pump is provided with a pump shaft. The clutch outer transmission shaft is connected to the gearbox. The clutch inner transmission shaft is connected to the pump shaft. A clutch disc is provided between the clutch outer transmission shaft and the clutch inner transmission shaft. When the pneumatic clutch is not ventilated, the clutch disc is in an engaged state, and the clutch outer transmission shaft and the clutch inner transmission shaft are in transmission connection; when the pneumatic clutch is ventilated, the clutch disc is in a disengaged state, and the clutch outer transmission shaft and the clutch inner transmission shaft are released from transmission connection; The pneumatic clutch pump is controlled. When the vehicle speed is higher than the set speed, the clutch outer drive shaft and the clutch inner drive shaft are connected and drive the pump shaft to rotate, and the variable pump provides oil power steering; when the vehicle speed is lower than the set speed, the clutch outer drive shaft and the clutch inner drive shaft are disconnected, the variable pump stops output, and the engine oil pump is switched to provide oil power steering.

2. The pneumatic clutch pump with emergency steering function according to claim 1, characterized in that: The clutch disc includes a friction plate and a wave pad. The friction plate is connected to the outer transmission shaft of the clutch, and the wave pad is connected to the inner transmission shaft of the clutch. When the pneumatic clutch is not ventilated, the friction plate and the wave pad are in transmission connection.

3. The pneumatic clutch pump with emergency steering function according to claim 2, characterized in that: The pneumatic clutch is provided with a piston, which is connected to a gas nozzle for introducing gas. After the gas is introduced, the piston pushes the wave pad to move away from the friction plate, so that the wave pad is separated from the friction plate.

4. The pneumatic clutch pump with emergency steering function according to claim 3, characterized in that: The pneumatic clutch is further provided with a secondary clutch disc, a sliding bearing and a pull rod. The secondary clutch disc is connected to the sliding bearing. The pull rod connects the secondary clutch disc and the piston. The wave pad is provided on the secondary clutch disc.

5. The pneumatic clutch pump with emergency steering function according to claim 2, characterized in that: The clutch outer transmission shaft is provided with a main clutch disc at one end inside the clutch housing, and the friction plate is provided on the main clutch disc.

6. The pneumatic clutch pump with emergency steering function according to claim 5, characterized in that: The pneumatic clutch pump is further provided with a speed sensor. A gear is provided on the main clutch disc. The speed sensor monitors the speed of the gear in real time and sends an alarm signal when the speed of the speed sensor is 0.

7. The pneumatic clutch pump with emergency steering function according to claim 1, characterized in that: A first bearing is provided between the clutch outer transmission shaft and the clutch housing. The clutch outer transmission shaft is provided with an outer transmission shaft hole at one end inside the clutch housing. A second bearing is installed in the outer transmission shaft hole. The first end of the clutch inner transmission shaft is provided in the outer transmission shaft hole and is rotatably supported on the second bearing.

8. The pneumatic clutch pump with emergency steering function according to claim 7, characterized in that: An inner transmission shaft hole is provided at the end portion of the second end of the inner transmission shaft of the clutch, and a transmission part is provided at the end portion of the pump shaft, and the transmission part is connected with the inner transmission shaft hole for transmission.

9. The pneumatic clutch pump with emergency steering function according to claim 1, characterized in that: The set speed is 30 km / h.

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