Gearbox and vessel

Abstract

This application provides a gearbox and a vessel. The gearbox is used in a vessel. The vessel includes an engine and a propeller. The gearbox includes a reservoir, a control device, a tow pump, an input shaft, and an output shaft. The reservoir is used to store oil. The control device is used to supply oil to at least one lubrication point. The suction port of the tow pump is connected to the reservoir, and the discharge port of the tow pump is connected to the control device. The tow pump is used to draw oil from the reservoir to the control device. The input shaft is used to connect to the engine. The input end of the output shaft is used to connect to the input shaft, and the output end of the output shaft is used to connect to the propeller. The gearbox is configured such that the tow pump operates when the output shaft rotates. According to the gearbox of this application, when the propeller is driven by water flow, the gearbox does not require an external lubrication pump; lubrication can be provided to the lubrication points within the gearbox via the tow pump. Simultaneously, the lubrication supply to the gearbox is not affected during normal propulsion and no-load operation.

Description

Technical Field

[0001] This application relates generally to the field of transmission technology, and more specifically to a gearbox and a ship. Background Technology

[0002] Marine gearboxes operate under the following conditions: When the main engine is off, the gearbox input shaft does not rotate, and the gearbox oil pump is not working. When the propeller is driven by the water flow, the gearbox output shaft rotates accordingly, causing the internal shaft system to rotate. In this case, additional lubricating oil is required to lubricate the shaft system. Existing marine gearboxes do not address these operating conditions; that is, they lack the capability to provide lubrication through their own lubrication system without relying on an external lubrication pump.

[0003] Therefore, there is a need to provide a gearbox and a vessel that can at least partially solve the above problems. Summary of the Invention

[0004] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This summary section is not intended to limit the key and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] To at least partially address the aforementioned problems, a first aspect of this application provides a gearbox for a ship, the ship including an engine and a propeller, the gearbox comprising:

[0006] A liquid storage space for storing oil;

[0007] A control device, the control device being used at least to supply the oil to at least one lubrication point;

[0008] A tow pump, wherein the suction port of the tow pump is connected to the liquid storage space, and the discharge port of the tow pump is connected to the control device, and the tow pump is used to draw the oil from the liquid storage space to the control device;

[0009] An input shaft for connection to the engine to rotate under the drive of the engine; and

[0010] An output shaft, wherein the input end of the output shaft is connected to the input shaft, and the output end of the output shaft is connected to the propeller to drive the propeller to rotate.

[0011] The gearbox is configured such that the drag pump operates when the output shaft rotates.

[0012] Optionally, the gearbox further includes a belt pump, the suction port of which is connected to the liquid storage space, and the discharge port of which is connected to the control device. The belt pump is used to draw the oil from the liquid storage space to the control device. The gearbox is configured such that the belt pump operates when the input shaft rotates.

[0013] Optionally, a first suction pipe is provided between the motorized pump and the liquid storage space, with both ends of the first suction pipe connected to the motorized pump and the liquid storage space, respectively.

[0014] A second suction pipe is provided between the drag pump and the liquid storage space, with the two ends of the second suction pipe connected to the drag pump and the liquid storage space, respectively.

[0015] Optionally, a first discharge pipeline is provided between the belt pump and the control device, with both ends of the first discharge pipeline connected to the belt pump and the control device, respectively.

[0016] A second discharge pipe is provided between the traction pump and the control device. The second discharge pipe has an outlet end that is away from the traction pump. The outlet end is connected to and communicates with the first discharge pipe.

[0017] Optionally, the gearbox further includes a one-way valve connected to the second discharge pipeline, the one-way valve being located between the outlet end and the drag pump, and the drag pump having an overflow valve internally communicating with the liquid storage space;

[0018] The one-way valve is used to allow the oil in the second discharge pipeline to flow unidirectionally from the towing pump to the control device; the overflow valve is used to allow the oil inside the towing pump to flow back to the storage space through the overflow valve when the pressure at the one-way valve is higher than the pressure at the towing pump.

[0019] Optionally, the gearbox further includes:

[0020] A cooler, connected to the first discharge line, is located between the outlet end and the control device; and

[0021] A filter connected to the first discharge line, the filter being located between the outlet end and the control device;

[0022] The filter is located downstream of the cooler, along the flow direction of the oil from the storage space to the control device.

[0023] Optionally, the gearbox further includes:

[0024] A protective device is used to regulate the pressure of the control device;

[0025] A first inlet pipe, the two ends of which are respectively connected to the first outlet pipe and the protective device; and

[0026] The first liquid outlet pipe has its two ends connected to the protection device and the liquid storage space, respectively.

[0027] Optionally, the first discharge pipeline is equipped with a cooler and a filter, and the filter is located downstream of the cooler along the flow direction of the oil from the storage space to the control device.

[0028] The connection point between the first inlet pipe and the first outlet pipe is located downstream of the filter.

[0029] Optionally, the gearbox further includes a transmission assembly for connecting the input shaft and the propeller, the transmission assembly having the lubrication points.

[0030] A first fluid supply line is provided between the transmission assembly and the protection device, and the transmission assembly feeds back the fluid to the protection device through the first fluid supply line.

[0031] Optionally, the gearbox further includes:

[0032] An intermediate shaft is connected to the input shaft to rotate under the drive of the input shaft. The intermediate shaft is also connected to the belt pump. The gearbox is configured such that the belt pump operates when the intermediate shaft rotates.

[0033] Optionally, the intermediate shaft is connected to the belt pump via gears.

[0034] Optionally, the gearbox further includes:

[0035] A clutch, used to control the engagement and disengagement of the gearbox and the propeller, the clutch having the lubrication point, and a second fluid supply line provided between the clutch and the control device, through which the control device supplies oil to the clutch; and / or

[0036] A transmission assembly is provided for connecting the input shaft and the propeller. The transmission assembly has the lubrication point. A third fluid supply line is provided between the transmission assembly and the control device. The control device supplies the oil to the transmission assembly through the third fluid supply line.

[0037] Optionally,

[0038] The output shaft is connected to the towing pump via gears; and / or

[0039] The liquid storage space is the oil pan of the gearbox.

[0040] A second aspect of this application provides a vessel, said vessel comprising:

[0041] propeller;

[0042] Engine; and

[0043] According to the gearbox of the first aspect of this application, the output shaft is connected to the propeller, and the input shaft is connected to the engine, such that the engine can drive the propeller.

[0044] According to the gearbox of this application, the towing pump is connected to the propeller drive via the output shaft. When the propeller is driven by water flow, the gearbox does not require an external lubrication pump; the towing pump can provide lubrication to the lubrication points between the output shaft and the propeller (within the gearbox). Simultaneously, it does not affect the lubrication supply to the gearbox during normal propulsion and when the vehicle is running empty. Attached Figure Description

[0045] The following drawings, illustrating embodiments of this application, are incorporated herein by reference and are used to understand this application. The drawings illustrate embodiments of this application and their descriptions, serving to explain the principles of this application. In the drawings,

[0046] Figure 1 This is a schematic diagram of the engine and propeller drive connection in a ship according to a preferred embodiment of this application; and

[0047] Figure 2 for Figure 1 The diagram shows the flow of oil inside the gearbox of a ship.

[0048] Explanation of reference numerals in the attached figures:

[0049] 100 Gearbox

[0050] 101 Input Axis

[0051] 102 Intermediate Shaft

[0052] 103 Output Shaft

[0053] 110 Liquid storage space

[0054] 111 Discharge valve

[0055] 112 Temperature Measuring Component

[0056] 113 Oil

[0057] 120 pump

[0058] 121 First suction line

[0059] 122 First discharge pipeline

[0060] 130 Trailer Pump

[0061] 131 Second suction line

[0062] 132 Second discharge pipeline

[0063] 133 Export end

[0064] 134 Check Valve

[0065] 135 Cooler

[0066] 136 Filter

[0067] 140 Control device

[0068] 141 Second Liquid Supply Line

[0069] 142 Third liquid supply line

[0070] 143 First Branch Road

[0071] 144 Second Branch Road

[0072] 145 Third Branch Road

[0073] 150 Protection Device

[0074] 151 First Inlet Pipeline

[0075] 152 First outlet pipeline

[0076] 153 First Liquid Supply Line

[0077] 160 clutch

[0078] 170 Transmission Components

[0079] 171 Drive shaft

[0080] 172 Transmission Gear

[0081] 173 Transmission Bearing

[0082] 200 ships

[0083] 210 engine

[0084] 220 propeller Detailed Implementation

[0085] In the following description, numerous specific details are set forth to provide a more thorough understanding of this application. However, it will be apparent to those skilled in the art that embodiments of this application may be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described to avoid confusion with embodiments of this application.

[0086] To fully understand the embodiments of this application, a detailed structure will be presented in the following description. Obviously, the implementation of the embodiments of this application is not limited to the specific details familiar to those skilled in the art.

[0087] It should be understood that the terminology used herein is intended only to describe particular embodiments and is not intended to limit the scope of this application. The singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. When the terms “comprising” and / or “including” are used in this specification, they indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0088] The ordinal numbers such as "first" and "second" used in this application are merely identifiers and have no other meaning, such as a specific order. Furthermore, for example, the term "first component" does not imply the existence of a "second component," and the term "second component" does not imply the existence of a "first component." It should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "inner," "outer," and similar expressions used in this application are for illustrative purposes only and are not intended to be limiting.

[0089] The specific embodiments of this application will be described in more detail below with reference to the accompanying drawings, which illustrate representative embodiments of this application and are not intended to limit this application.

[0090] This application provides a gearbox and a ship having the gearbox.

[0091] Please see Figure 1 The vessel 200 includes a propeller 220, an engine 210, and a gearbox 100. The gearbox 100 is connected between the engine 210 and the propeller 220, and acts as a transmission component to transmit the power of the engine 210 to the propeller 220, so that the propeller 220 rotates.

[0092] Specifically, please refer to Figure 1 and Figure 2 The gearbox 100 includes an input shaft 101, an output shaft 103, a liquid storage space 110, a motor-driven pump 120, and a control device 140.

[0093] Input shaft 101 is connected to engine 210 to rotate under the drive of engine 210. The input end of output shaft 103 is connected to input shaft 101, and the output end of output shaft 103 is connected to propeller 220 to drive propeller 220 to rotate. That is, output shaft 103 is connected to propeller 220, and input shaft 101 is connected to engine 210, so that engine 210 can drive propeller 220. Alternatively, gearbox 100 can be considered to include transmission assembly 170, which connects input shaft 101 and propeller 220. Transmission assembly 170 mainly includes, for example, a transmission shaft 171, transmission gear 172, and transmission bearing 173 that link engine 210 and propeller 220. In order to ensure the smooth operation of the transmission assembly 170 or transmission component, the transmission assembly 170 or transmission component has lubrication points (i.e., parts that require lubrication or where lubricating oil is added). When the transmission assembly 170 or transmission component is in operation, lubricating oil needs to be added to the lubrication points.

[0094] Control device 140 is used to distribute (supply) oil 113 to at least one lubrication point. Control device 140 is configured, for example, as a hydraulic control unit. Reservoir 110 is used to store oil 113. The suction port of belt pump 120 is connected to reservoir 110, and the discharge port of belt pump 120 is connected to control device 140. Belt pump 120 is used to draw oil 113 from reservoir 110 to control device 140. It should be noted that gearbox 100 is configured such that belt pump 120 operates when input shaft 101 rotates. Belt pump 120 delivers oil to control device 140, and control device 140 then supplies oil 113 to each lubrication point.

[0095] It is understood that the gearbox 100 also includes a clutch 160. The clutch 160 is used to control the engagement and disengagement of the gearbox 100 and the propeller 220. The clutch 160 also has lubrication points, for example. The hydraulic control unit divides the oil 113 into two parts, one part is working oil for use by the clutch 160, and the other part is lubricating oil, which is delivered to the lubrication points of the shaft system through pipelines.

[0096] The following is a brief description of the operation of the motor-driven pump 120.

[0097] Since the input shaft 101 rotates with the engine 210, it remains in a rotating state regardless of whether the clutch 160 controls the gearbox 100 to be linked or disengaged from the propeller 220 when the engine 210 is running. The rotation of the input shaft 101 drives the motor-driven pump 120. When the motor-driven pump 120 operates, it draws oil 113 from the reservoir 110 to the control device 140, thereby enabling the control device 140 to supply oil 113 to the lubrication points for lubrication.

[0098] When engine 210 stops, input shaft 101 stops rotating, and correspondingly, motor-driven pump 120 also stops. At this time, if the propeller 220 of the ship 200 is driven by the water flow, the rotation of propeller 220 will cause output shaft 103 to rotate. Consequently, the shaft system connected to output shaft 103 will rotate accordingly. With motor-driven pump 120 stopped, there is no lubrication system to provide lubricating oil to the shaft system in gearbox 100 that rotates with propeller 220. Based on this, please refer to [further details needed]. Figure 1 and Figure 2 The gearbox 100 also includes a drag pump 130.

[0099] The following is a detailed description of the drag pump 130.

[0100] The suction port of the tow pump 130 is connected to the liquid storage space 110, and the discharge port of the tow pump 130 is connected to the control device 140. The tow pump 130 is used to draw oil 113 from the liquid storage space 110 to the control device 140. It should be noted that the gearbox 100 is configured such that the tow pump 130 operates when the output shaft 103 rotates. It can be understood that the output shaft 103 can be driven to rotate by the engine 210; when the engine 210 is stopped, if the propeller 220 is driven by the water flow, the propeller 220 will also drive the output shaft 103 to rotate. That is to say, regardless of whether the output shaft 103 is driven by the engine 210 or the propeller 220, the output shaft 103 will drive the tow pump 130 to operate. Specifically, when the engine 210 is running and the clutch 160 controls the gearbox 100 to be linked with the propeller 220, the output shaft 103 rotates with the engine 210, and both the motor pump 120 and the drag pump 130 operate to draw oil 113 from the reservoir 110 to the control device 140. The control device 140 then supplies oil 113 to the lubrication points to achieve lubrication.

[0101] When the engine 210 is running and the clutch 160 disengages the gearbox 100 from the propeller 220, the output shaft 103 will not rotate with the engine 210. Similarly, when the engine 210 is stopped, the output shaft 103 will also not rotate due to the engine's cessation of operation. In both cases, if the propeller 220 is not driven by water flow, the output shaft 103 will not rotate; if the propeller 220 is driven by water flow, the output shaft 103 will rotate. Correspondingly, the shaft system (e.g., transmission assembly 170) connected to the output shaft 103 will rotate accordingly. Consequently, the drag pump 130 will operate with the rotation of the output shaft 103, drawing oil 113 from the reservoir 110 to the control device 140, which then supplies the oil 113 to the lubrication points for lubrication.

[0102] According to the configuration of the gearbox 100 and the drag pump 130 in this scheme, the gearbox 100 can provide lubricating oil by itself without relying on an external lubricating oil pump, and without affecting the operation of the engine 210 or the lubricating oil supply when it is stopped.

[0103] Furthermore, the gearbox 100 also includes an intermediate shaft 102. The intermediate shaft 102 is connected to the input shaft 101 and rotates under the drive of the input shaft 101. The intermediate shaft 102 is also connected to the drive pump 120. The gearbox 100 is configured such that when the intermediate shaft 102 rotates, the drive pump 120 operates. Preferably, the intermediate shaft 102 and the drive pump 120 are connected by gears. Similarly, the output shaft 103 is connected to the drag pump 130 by gears. The fluid reservoir 110 is preferably configured as an oil pan inside the gearbox 100.

[0104] Please continue reading. Figure 1 A first suction pipe 121 is provided between the motorized pump 120 and the liquid storage space 110, with both ends of the first suction pipe 121 connected to the motorized pump 120 and the liquid storage space 110, respectively. A second suction pipe 131 is provided between the motorized pump 130 and the liquid storage space 110, with both ends of the second suction pipe 131 connected to the motorized pump 130 and the liquid storage space 110, respectively. A first discharge pipe 122 is provided between the motorized pump 120 and the control device 140, with both ends of the first discharge pipe 122 connected to the motorized pump 120 and the control device 140, respectively. A second discharge pipe 132 is provided between the motorized pump 130 and the control device 140. One end of the second discharge pipe 132 is connected to the motorized pump 130, and the second discharge pipe 132 also has an outlet end 133 away from the motorized pump 130, which is connected to and communicates with the first discharge pipe 122. In this way, the first discharge pipe 122 and the second discharge pipe 132 converge, which can save on the amount of pipe used.

[0105] To optimize the oil supply to the tow pump 130 and protect the tow pump 130 and its corresponding piping, the gearbox 100 also includes a one-way valve 134. The one-way valve 134 is connected to the second discharge line 132 and is located between the aforementioned outlet end 133 and the tow pump 130. Furthermore, the tow pump 130 has an internal overflow valve communicating with the reservoir 110. It should be noted that the one-way valve 134 allows the oil 113 in the second discharge line 132 to flow unidirectionally from the tow pump 130 to the control device 140. The overflow valve allows the oil 113 inside the tow pump 130 to flow back to the reservoir 110 when the pressure at the one-way valve 134 is higher than the pressure at the tow pump 130.

[0106] The gearbox 100 also includes a cooler 135 and a filter 136. Specifically, the cooler 135 is connected to the first discharge pipe 122. The cooler 135 is located between the outlet end 133 and the control device 140. The filter 136 is connected to the first discharge pipe 122 and is located between the outlet end 133 and the control device 140. It should be noted that the filter 136 is located downstream of the cooler 135 along the flow direction of the oil 113 from the reservoir 110 to the control device 140. It can be understood that since the first discharge pipe 122 and the second discharge pipe 132 are combined at the front end of the control device 140, in addition to saving the amount of piping, only one set of filter 136 and cooler 135 needs to be installed here, thus saving the number of filters 136 and coolers 135 used. The cooler 135 removes heat from the oil 113, for example, through heat sinks or coolant, to regulate the temperature of the oil 113 and prevent the oil temperature from becoming too high. Proper oil temperature reduces thermal stress on the equipment within the gearbox 100, preventing damage due to overheating. Cooler 135 ensures the oil 113 operates within its optimal temperature range, improving lubrication and system efficiency. Filter 136, for example, using a screen or filter element, removes impurities, particles, and contaminants from the oil 113, ensuring its cleanliness. Clean oil 113 reduces wear on moving parts such as gears and bearings within the gearbox 100, extending equipment lifespan. Filter 136 prevents impurities from entering the lubrication system, reducing the likelihood of malfunctions and improving system reliability.

[0107] Please continue reading. Figure 1 The gearbox 100 also includes a protection device 150, which is used to regulate the pressure of the control device 140. Specifically, the gearbox 100 also includes a first inlet pipe 151 and a first outlet pipe 152. The two ends of the first inlet pipe 151 are respectively connected to the first outlet pipe 122 and the protection device 150. The two ends of the first outlet pipe 152 are respectively connected to the protection device 150 and the storage space 110. It should be noted that the connection end between the first inlet pipe 151 and the first outlet pipe 122 is located downstream of the filter 136. That is to say, the oil 113 entering the protection device 150 and the control device 140 from the storage space 110 is cooled and filtered, thereby improving the lubrication effect on the components.

[0108] Furthermore, a first fluid supply line 153 is provided between the transmission assembly 170 and the protection device 150, through which the transmission assembly 170 can feed back fluid 113 to the protection device 150. A second fluid supply line 141 is provided between the clutch 160 and the control device 140, through which the control device 140 supplies fluid 113 to the clutch 160. A third fluid supply line 142 is provided between the transmission assembly 170 and the control device 140, through which the control device 140 supplies fluid to the transmission assembly 170. For example... Figure 1 In this configuration, drive shaft 171 is connected to control device 140 and protection device 150 via first branch 143. Drive gear 172 is connected to control device 140 and protection device 150 via second branch 144. Drive bearing 173 is connected to control device 140 and protection device 150 via third branch 145.

[0109] The following describes the process of supplying oil 113 to the liquid storage space 110.

[0110] When the engine 210 is running and the gearbox 100 is in forward or reverse engagement mode, that is, when the engine 210 is running and the gearbox 100 is linked with the propeller 220, the input shaft 101 drives the intermediate shaft 102 and the output shaft 103 to rotate. The motor-driven pump 120 operates with the rotation of the intermediate shaft 102, drawing oil 113 from the reservoir 110 via the first suction pipe 121, and passing it through the first discharge pipe 122, cooler 135, and filter 136 into the control device 140. Simultaneously, the traction pump 130 operates with the rotation of the output shaft 103, drawing oil 113 from the reservoir 110 via the second suction pipe 131, and passing it through the second discharge pipe 132, cooler 135, and filter 136 into the control device 140. In other words, the traction pump 130 and the motor-driven pump 120 operate simultaneously. It should be noted that when the pressure at the one-way valve 134 is higher than the pressure at the towing pump 130, the oil 113 inside the towing pump 130 flows back to the reservoir 110 via the overflow valve. The oil 113 at the control device 140 will be divided into two parts: one part is supplied to the clutch 160 through the second supply line 141, and the other part is supplied to the transmission assembly 170 through the third supply line 142. The transmission assembly 170 can also provide feedback on the oil 113 to the protection device 150 through the first supply line 153. When the transmission assembly 170 provides feedback on the oil 113 to the protection device 150 through the first supply line 153, the control device 140 determines that the pressure of the oil 113 inside the control device 140 is too high. When the pressure of the oil 113 inside the control device 140 is too high, the oil 113 that has passed through the filter 136 will flow to the protection device 150 through the first inlet line 151. The oil 113 that enters the protection device 150 can flow back to the storage space 110 through the first outlet pipe 152.

[0111] When the engine 210 is running and the gearbox 100 is idling (i.e., the engine 210 is running and the gearbox 100 is disconnected from the propeller 220), the intermediate shaft 102 is rotated by the input shaft 101. Without water flow, the output shaft 103 does not rotate. The motor-driven pump 120 operates with the rotation of the intermediate shaft 102. The motor-driven pump 120 draws oil 113 from the reservoir 110 via the first suction pipe 121, and enters the control device 140 through the first discharge pipe 122, cooler 135, and filter 136. The oil 113 at the control device 140 is divided into two parts: one part is supplied to the clutch 160 via the second supply pipe 141, and the other part is supplied to the transmission assembly 170 via the third supply pipe 142. The transmission assembly 170 can also feed back oil 113 to the protection device 150 via the first supply pipe 153. When the transmission assembly 170 sends feedback of oil 113 to the protection device 150 through the first supply line 153, the control device 140 determines that the pressure of the oil 113 inside the control device 140 is too high. When the pressure of the oil 113 inside the control device 140 is too high, the oil 113 that has passed through the filter 136 will flow to the protection device 150 through the first inlet line 151. The oil 113 entering the protection device 150 can flow back to the storage space 110 through the first outlet line 152.

[0112] When the engine 210 is running and the gearbox 100 is idling, that is, when the engine 210 is running and the gearbox 100 is disconnected from the propeller 220, the intermediate shaft 102 is driven to rotate by the input shaft 101. When the output shaft 103 is driven by water flow, the lubrication is achieved in the same way as described above when "the engine 210 is running and the gearbox 100 is in a forward or reverse engagement state". It will not be repeated here.

[0113] When engine 210 is stopped, input shaft 101 of gearbox 100 does not rotate. When there is no water flow to drive propeller 220, output shaft 103 of gearbox 100 does not rotate, and gearbox 100 does not require lubrication. That is, neither motor-driven pump 120 nor trailer pump 130 operates.

[0114] When the engine 210 stops, the input shaft 101 of the gearbox 100 does not rotate. When the water flow drives the propeller 220 to rotate, the output shaft 103 of the gearbox 100 rotates, and the drag pump 130 operates along with the rotation of the output shaft 103. The drag pump 130 draws oil 113 from the storage space 110 through the second suction pipe 131, and enters the control device 140 through the second discharge pipe 132, the cooler 135, and the filter 136. The oil 113 at the control device 140 is supplied to the transmission assembly 170 through the third supply pipe 142. The transmission assembly 170 can also feed back the oil 113 to the protection device 150 through the first supply pipe 153. When the transmission assembly 170 feeds back the oil 113 to the protection device 150 through the first supply pipe 153, the control device 140 determines that the pressure of the oil 113 inside the control device 140 is too high. When the pressure of the oil 113 in the control device 140 is too high, the oil 113 that has passed through the filter 136 will flow to the protection device 150 through the first inlet pipe 151. The oil 113 that enters the protection device 150 can flow back to the storage space 110 through the first outlet pipe 152.

[0115] The following describes a specific application scenario of a ship 200.

[0116] A vessel 200 has four engines 210 and four propellers 220. Each engine 210 is equipped with a gearbox 100. When two engines 210 and two propellers 220 are operating, the other two engines 210 are shut down. At this time, the input shaft 101 of the gearbox 100 corresponding to the shut-down engine 210 does not rotate, and the motor-driven pump 120 inside the gearbox 100 is not working. When the propeller 220 corresponding to the shut-down engine 210 is driven by water flow, the output shaft 103 inside the gearbox 100 corresponding to the propeller 220 rotates, thereby driving the tow pump 130 corresponding to the output shaft 103. The tow pump 130 draws oil 113 from the storage space 110 via a second suction pipe 131, and enters the control device 140 through a second discharge pipe 132, a cooler 135, and a filter 136. The oil 113 at the control device 140 is supplied to the transmission assembly 170 through the third supply line 142. The transmission assembly 170 can also feed back the oil 113 to the protection device 150 through the first supply line 153. When the transmission assembly 170 feeds back the oil 113 to the protection device 150 through the first supply line 153, the control device 140 determines that the pressure of the oil 113 inside the control device 140 is too high. When the pressure of the oil 113 inside the control device 140 is too high, the oil 113 that has passed through the filter 136 will flow to the protection device 150 through the first inlet line 151. The oil 113 entering the protection device 150 can flow back to the storage space 110 through the first outlet line 152.

[0117] The gearbox according to this application enables a stable supply of lubricating oil at low speeds (e.g., ≤150 rpm) and also allows stable operation at high speeds (e.g., ≥3000 rpm). When the propeller is driven by water flow, causing the shaft connected to the propeller to rotate, the gearbox can supply lubricating oil through its own lubrication piping system without affecting the normal sailing of the ship or the supply of lubricating oil during gearbox idling.

[0118] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the scope of this application. Terms such as “setup” appearing herein can refer to either a component being directly attached to another component or a component being attached to another component via an intermediary. A feature described in one embodiment herein may be applied, alone or in combination with other features, to another embodiment, unless that feature is not applicable in that other embodiment or is otherwise stated.

[0119] This application has been described through the above embodiments; however, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit this application to the described embodiments. Those skilled in the art will understand that many more variations and modifications can be made based on the teachings of this application, and all such variations and modifications fall within the scope of protection claimed in this application.

Claims

1. A gearbox for a ship, the ship including an engine and a propeller, characterized in that, The gearbox includes: A liquid storage space for storing oil; A control device, the control device being used at least to supply the oil to at least one lubrication point; A tow pump, wherein the suction port of the tow pump is connected to the liquid storage space, and the discharge port of the tow pump is connected to the control device, and the tow pump is used to draw the oil from the liquid storage space to the control device; An input shaft for connection to the engine to rotate under the drive of the engine; and An output shaft, wherein the input end of the output shaft is connected to the input shaft, and the output end of the output shaft is connected to the propeller to drive the propeller to rotate. The gearbox is configured such that the drag pump operates when the output shaft rotates.

2. The gearbox according to claim 1, characterized in that, The gearbox also includes a belt pump, the suction port of which is connected to the liquid storage space, and the discharge port of which is connected to the control device. The belt pump is used to draw oil from the liquid storage space to the control device. The gearbox is configured such that the belt pump operates when the input shaft rotates.

3. The gearbox according to claim 2, characterized in that, A first suction pipe is provided between the motorized pump and the liquid storage space, with its two ends connected to the motorized pump and the liquid storage space, respectively. A second suction pipe is provided between the drag pump and the liquid storage space, with the two ends of the second suction pipe connected to the drag pump and the liquid storage space, respectively.

4. The gearbox according to claim 3, characterized in that, A first discharge pipe is provided between the belt pump and the control device, with its two ends connected to the belt pump and the control device, respectively. A second discharge pipe is provided between the traction pump and the control device. The second discharge pipe has an outlet end that is away from the traction pump. The outlet end is connected to and communicates with the first discharge pipe.

5. The gearbox according to claim 4, characterized in that, The gearbox also includes a one-way valve, which is connected to the second discharge pipeline. The one-way valve is located between the outlet end and the drag pump. The drag pump is equipped with an overflow valve that communicates with the liquid storage space. The one-way valve is used to allow the oil in the second discharge pipeline to flow unidirectionally from the towing pump to the control device; the overflow valve is used to allow the oil inside the towing pump to flow back to the storage space through the overflow valve when the pressure at the one-way valve is higher than the pressure at the towing pump.

6. The gearbox according to claim 4, characterized in that, The gearbox also includes: A cooler, connected to the first discharge line, is located between the outlet end and the control device; and A filter connected to the first discharge line, the filter being located between the outlet end and the control device; The filter is located downstream of the cooler, along the flow direction of the oil from the storage space to the control device.

7. The gearbox according to claim 4, characterized in that, The gearbox also includes: A protective device is used to regulate the pressure of the control device; A first inlet pipe, the two ends of which are respectively connected to the first outlet pipe and the protective device; and The first liquid outlet pipe has its two ends connected to the protection device and the liquid storage space, respectively.

8. The gearbox according to claim 7, characterized in that, The first discharge pipeline is equipped with a cooler and a filter. Along the flow direction of the oil from the storage space towards the control device, the filter is located downstream of the cooler. The connection point between the first inlet pipe and the first outlet pipe is located downstream of the filter.

9. The gearbox according to claim 7, characterized in that, The gearbox also includes a transmission assembly for connecting the input shaft and the propeller, the transmission assembly having the lubrication points. A first fluid supply line is provided between the transmission assembly and the protection device, and the transmission assembly feeds back the fluid to the protection device through the first fluid supply line.

10. The gearbox according to claim 2, characterized in that, The gearbox also includes: An intermediate shaft is connected to the input shaft to rotate under the drive of the input shaft. The intermediate shaft is also connected to the belt pump. The gearbox is configured such that the belt pump operates when the intermediate shaft rotates.

11. The gearbox according to claim 10, characterized in that, The intermediate shaft is connected to the machine-driven pump via gears.

12. The gearbox according to any one of claims 1 to 11, characterized in that, The gearbox also includes: A clutch, used to control the engagement and disengagement of the gearbox and the propeller, the clutch having the lubrication point, and a second fluid supply line provided between the clutch and the control device, through which the control device supplies oil to the clutch; and / or A transmission assembly is provided for connecting the input shaft and the propeller. The transmission assembly has the lubrication point. A third fluid supply line is provided between the transmission assembly and the control device. The control device supplies the oil to the transmission assembly through the third fluid supply line.

13. The gearbox according to any one of claims 1 to 11, characterized in that, The output shaft is connected to the towing pump via gears; and / or The liquid storage space is the oil pan of the gearbox.

14. A ship, characterized in that, The vessels include: propeller; Engine; and The gearbox according to any one of claims 1 to 13, wherein the output shaft is connected to the propeller and the input shaft is connected to the engine such that the engine can drive the propeller.

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