阅读说明：本技术 一种船用舷外发动机 (Outboard engine for ship ) 是由 唐志国 于 2018-06-22 设计创作，主要内容包括：一种船用舷外发动机,包括整流罩、发动机、可操作地连接到曲轴的驱动轴、齿轮箱、布置在齿轮箱中并与驱动轴连接的变速器、通常垂直于驱动轴布置且可操作地连接到变速器的螺旋桨轴以及叶片螺旋桨连接到螺旋桨轴。一对发动机支架可操作地连接到发动机。每个发动机支座限定发动机悬置工作轴。转向轴可操作地枢转地连接到发动机悬置上。发动机悬置工作轴通常垂直于转向轴并通过转向轴。艉支架可操作地枢转连接到转向轴,用于将舷外发动机安装到船上。还公开了一种海上舷外发动机,其中发动机悬置的主轴通过转向轴。(A marine outboard engine includes a cowling, an engine, a driveshaft operatively connected to a crankshaft, a gearbox, a transmission disposed in the gearbox and connected to the driveshaft, a propeller shaft disposed generally perpendicular to the driveshaft and operatively connected to the transmission, and a bladed propeller connected to the propeller shaft. A pair of engine mounts is operatively connected to the engine. Each engine mount defines an engine mount working shaft. The steering shaft is operatively pivotally connected to the engine mount. The engine mount working shaft is generally perpendicular to and passes through the steering shaft. The stern bracket is operatively pivotally connected to the steering shaft for mounting the outboard engine to the boat. An offshore outboard engine is also disclosed, wherein the main shaft of the engine mount passes through the steering shaft.)

1. An outboard engine for a ship, characterized in that: comprises a fairing; an engine disposed within the cowling; the engine includes: a crankcase, at least one cylinder connected to the crankcase; a crankshaft disposed in the crankcase, the crankshaft defining a crankshaft axis; a drive shaft disposed in the fairing generally parallel to the crankshaft axis, the drive shaft having a first end and a second end, the first end of the drive shaft operatively connected to the crankshaft; the gearbox is operatively connected to the cowl; a transmission disposed in the gearbox; a transmission operably connected to the second end of the drive shaft; a propeller shaft at least partially disposed in the gearbox generally perpendicular to the drive shaft, the propeller shaft operatively connected to the transmission; the blade propeller is connected to the propeller; a first engine mount operatively connected to a first side of the engine, the first engine mount defining a first engine mount working axis; a second engine mount operatively connected to a second side of the engine, the second engine mount defining a second engine mount working shaft; a steering shaft operatively pivotally connected to the first and second engine mounts, the steering shaft defining a steering axis, the steering shaft being generally parallel to the crankshaft axis, the first and second engine mount working shafts being generally perpendicular to the steering shaft, the first shaft; the second engine suspension working shaft passes through the steering shaft; the AND stern bracket is operatively pivotally connected to the steering shaft for mounting the outboard engine to the boat.

2. The outboard marine engine of claim 1, wherein: the first and second engine mount working shafts pass through the steering shaft when the engine speed is less than the engine transition speed.

3. The outboard marine engine of claim 1, wherein: the transition speed of the engine is less than 3000 rpm.

Technical Field

The present disclosure relates to an engine system. In particular to a marine outboard engine.

Background

Internal combustion engines can produce vibrations during operation. These vibrations are transmitted to the vehicle or device to which they are mounted. Engine mounts are typically installed between the engine and the vehicle or device to actively or passively reduce the transmission of vibrations thereto. The effectiveness of engine mounts is related to their type and their location among other factors. The engine mount is also typically more efficient than a range of engines. At low engine speeds, the main source of engine vibrations of an in-line engine is the so-called torque kick. Torque kick is a reaction to the force of the wrist pin of the engine block (crankcase and cylinder) adjacent the wall of the cylinder during combustion. The side force is a result of the connecting rod forming an angle with respect to the cylinder axis, while the piston is loaded by the combustion pressure in the direction of the cylinder axis. The torque kick produces an alternating moment about the torque roller axis of the engine. This moment causes the engine to rotate/vibrate about the torque roll axis. Thus, by making the working shaft of the engine mount, the force reaction of the engine mount and the moment generated at a low engine speed are applied to the moment arm having the length D, and the moment of the steering shaft about the steering shaft is generated. Then, the moment generated by the steering shaft is transmitted to the tillers as vibration. Existing marine outboard engines provide adequate damping at high engine speeds, but at lower engine speeds where the primary source of engine vibration is torque kicking, it provides less effective damping.

Disclosure of Invention

The present invention has been made to overcome the above-described disadvantages of the prior art, and an object of the present invention is to provide a marine outboard engine capable of more effectively suppressing vibration caused by torque kicking.

The technical scheme of the invention is as follows: comprises a fairing; an engine disposed within the cowling; the engine includes: a crankcase, at least one cylinder connected to the crankcase; a crankshaft disposed in the crankcase, the crankshaft defining a crankshaft axis; a drive shaft disposed in the fairing generally parallel to the crankshaft axis, the drive shaft having a first end and a second end, the first end of the drive shaft operatively connected to the crankshaft; the gearbox is operatively connected to the cowl; a transmission disposed in the gearbox; a transmission operably connected to the second end of the drive shaft; a propeller shaft at least partially disposed in the gearbox generally perpendicular to the drive shaft, the propeller shaft operatively connected to the transmission; the blade propeller is connected to the propeller; a first engine mount operatively connected to a first side of the engine, the first engine mount defining a first engine mount working axis; a second engine mount operatively connected to a second side of the engine, the second engine mount defining a second engine mount working shaft; a steering shaft operatively pivotally connected to the first and second engine mounts, the steering shaft defining a steering axis, the steering shaft being generally parallel to the crankshaft axis, the first and second engine mount working shafts being generally perpendicular to the steering shaft, the first shaft; the second engine suspension working shaft passes through the steering shaft; the AND stern bracket is operatively pivotally connected to the steering shaft for mounting the outboard engine to the boat.

The first and second engine mount working shafts pass through the steering shaft when the engine speed is less than the engine transition speed.

The transition speed of the engine is less than 3000 rpm.

The invention has the beneficial effects that: the accuracy of engine torque control can be improved, and vibration due to torque kick can be suppressed more effectively by setting the target engine torque accurately.

Drawings

Fig. 1 is a schematic structural view of the present invention.

In the figure, 1, cowling, 2, lower edge, 3, seal, 4, upper edge, 5, locking mechanism, 6, lower motor cover, 7, exhaust system, 8, propeller, 9, propeller shaft, 10, transmission, 11, drive mechanism, 12, drive shaft, 13, gear box, 14, rotation bracket, 15, valve stem bracket, 16, tillers, 17, upper motor cover, 18, engine, 19, top cap, 20, outboard engine.

Detailed Description

In fig. 1, a cowling 1 surrounds and protects an engine 18. The engine 18 is a conventional two-stroke internal combustion engine such as an in-line two-stroke two-cylinder engine, a four-stroke engine, or the like. The exhaust system 7 is connected to the engine 18 and is also surrounded by the cowling 1. The motor 18 is connected to a vertically oriented drive shaft 12. The drive shaft 12 is connected to a drive mechanism 11 comprising a transmission 10 and a bladed rotor, e.g. a propeller mounted on the propeller shaft 9. The propeller shaft 9 is generally perpendicular to the drive shaft 12. The drive mechanism 11 may also include a jet propulsion device, a turbine, or other known propulsion devices. The vane rotor may also be an impeller. Other known components of the engine assembly are included within the cowling 1, such as a starter motor and an alternator. The valve stem carrier 15 is connected to the cowling 1 by the swivel carrier 14 for mounting the outboard engine 20 to the vessel. The valve stem carrier 15 may take various forms. The swivel bracket 14 accommodates a steering shaft of the outboard engine 20. The tillers 16 are operatively connected to the fairing 1 to allow manual steering of the outboard engine 20. Other steering mechanisms may be provided to allow steering, such as the steering wheel of the boat. The fairing 1 comprises several main components including an upper motor cover 17 with a top cap 19 and a lower motor cover 6. The lowermost portion, commonly referred to as the gear box 13, is attached to an exhaust housing forming part of the exhaust system 7. The upper motor cover 17 preferably surrounds the top of the engine 18. The lower motor cover 6 encloses the engine 18 and the rest of the exhaust system 7. The gearbox 13 surrounds the transmission 10 and supports the drive mechanism 11 in a known manner. A propeller shaft 9 extends from the gear box 13 and supports the propeller 8. The upper motor cover 17 and the lower motor cover 6 are made of a thin sheet material, preferably plastic, but may also be metal, composite or the like. The lower motor cover 6 and/or other components of the fairing 1 can be formed as a single piece or as multiple pieces. For example, the lower motor cover 6 may be formed as two cross pieces that mate along a vertical joint. The lower motor cover 6, which is made of a thin sheet material, is preferably made of a composite material, but may also be plastic or metal. One suitable composite material is fiberglass. The lower edge 2 of the upper motor cover 17 mates with the upper edge 4 of the lower motor cover 6 in sealing relationship. A seal 3 is provided between the lower edge 2 of the upper motor cover 17 and the upper edge 4 of the lower motor cover 6 to form a watertight connection. The locking mechanism 5 is provided on at least one side of the fairing 1. A locking mechanism 5 is provided on each side of the fairing 1. The present invention can improve the accuracy of engine torque control, and can better suppress vibration caused by torque kick by correctly setting a target engine torque.