JPH0541999Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Purpose of invention] (Industrial application field) This invention relates to the oil chamber of an outboard motor.

(Prior art) An outboard motor generally has an external appearance as shown in Fig. 2.
An engine is mounted on the upper part of a vertically long casing 1 and covered with an engine cover 2. An oil chamber 4 is formed in the lower part of a gear case 3 connected to the lower part, a propeller 5 is arranged behind it, and a skating 6 is arranged in the lower part. The upper front part of this outboard motor is attached to the tail part of the hull via a clamp bracket 7 so that it can be tilted up.

The gear case 3 of the outboard motor as described above is equipped with a drive power transmission device of a gear mechanism that transmits the rotation of the engine to the propeller 5, and a shift device that switches between forward and reverse motion, and both of these devices are lubricated. Oil is required.

However, in conventional outboard motors, the lubricating oil supply system to both of these devices is the same.

(Problem to be solved by the invention) However, since the drive power transmission device consisting of a gear mechanism is used under extremely harsh conditions, the lubricating oil used must have high lubricity. will inevitably be high.

On the other hand, for shift devices, the requirements for lubricating oil performance are not very high, and conversely, when the viscosity of the lubricating oil increases, the shift device becomes difficult to operate, slowing down the operation speed, and increasing the operating force. This will lead to

In addition, drive force transmission devices consisting of gear mechanisms often have fine metal powder mixed into the lubricating oil during operation, so even if the lubricating oil containing this fine metal powder reaches the shift device, it is difficult to withstand it. The design had to take into consideration the structural and material issues, which resulted in problems such as an increase in the number of processes and an increase in costs.

This invention focuses on the problems of the prior art and aims to improve them by providing an oil chamber for an outboard motor in which the lubricating oil chamber is divided into two or more sections for the driving force transmission device using a gear mechanism and the shift device, and lubricating oil suitable for both devices is supplied separately.

[Structure of the idea]

(Means for solving the problem) In order to solve the above problem, this invention corrects the rotation of the drive shaft to the propeller shaft by meshing the shifter dog with a forward gear or reverse gear and moving it to a neutral position. In an outboard motor, the outboard motor is equipped with a driving force transmitting device that rotates, reverses, or neutralizes, and a shift device that has a shift cam that moves the shifter dog, the outboard motor containing lubricating oil that lubricates a rotating sliding part of the driving force transmitting device. The present invention is characterized in that an oil chamber and an oil chamber containing lubricating oil for lubricating the sliding parts of the shift device are independently partitioned, and lubricating oils with different performances are supplied to these oil chambers. It is something.

(Function) With the above configuration, the driving force transmission device contains high-performance lubricating oil that can withstand use under harsh conditions, and the oil chamber of the shift device contains lubricating oil with low viscosity. Therefore, lubrication that is suitable for each is performed, and the lubricating oil of the driving force transmission device does not flow into the shift device side.

(Example) An example of this invention will be described below with reference to FIG.

FIG. 1 shows a cross section of the gear case of an outboard motor to which this invention is applied. The drive power transmission device 8 and shift device 9 of the outboard motor themselves have the same structure as the conventional one. Illustrated.

The driving force transmission device 8 and shift device 9 are
One end of a shift cam 11 whose intermediate portion is pivotally supported at the lower part of the shift rod 10 is engaged, and the other end is engaged with a slide shifter 12 supported so as to be slidable in a direction perpendicular to the direction of movement of the shift rod 10. . A shifter dog 14 is attached to a slide pin 13 connected to the slide shifter 12 by a dog pin 15, and by moving the shift rod 10 up and down, the shift cam 11 swings to move the slide shifter 12, the slide pin 13, and the dog pin 15. Shifter Dog via 1
4 to forward gear 16 or reverse gear 17
It is designed to take a neutral position where it engages with the dog or does not engage with either dog. When the dog of either gear 16 or 17 is engaged, the rotation of the drive shaft 18 is transmitted from the drive gear 19 through the gear 16 or 17 to the propeller shaft 20 as normal rotation or reverse rotation.

A bearing box 21 is fixed to the gear case 3 and houses a detent etc. that facilitates the vertical operation of the shift rod 10 and determines the operating position. is sealed by an oil seal 22 (the upper part is not shown), and this bearing box 21
The interior thereof is an independent oil chamber 23.

On the other hand, inside the gear case 3 is a driving force transmission device 8.
The oil chambers 24, 24...

The lubricating oil stored in the oil chamber 23 in the bearing box 21 has a relatively low viscosity, and the lubricating oil has a relatively low viscosity.
The lubricating oil stored in the oil chamber 24 has a relatively high viscosity, and is used in the main parts such as the meshing parts of each gear, the sliding and rotating parts of the shifter dog 14, the slide shifter 12, and the sliding and rotating parts of the slide pin 13. It is designed to lubricate the moving parts.

Therefore, the shift rod 10 of the shift device 9
The sliding parts related to the movement of the bearing box 21 are lubricated by lubricating oil stored in an oil chamber 23, and each rotating sliding part of the drive force transmission device 8 is stored in an oil chamber 24. Since the lubricating oil is used, the lubricating oils of both lubrication systems do not mix, and the optimum lubricating oil can be selected and used for the shift device 9 and the driving force transmission device 8, respectively.

[Effect of idea]

As described above, this invention provides an oil chamber for storing lubricating oil for lubricating the rotating and sliding parts of the drive force transmission device and an oil chamber for storing lubricating oil for lubricating the sliding parts of the shift device in an outboard motor. Since the oil chamber of the drive force transmission device consisting of a gear mechanism is divided into separate compartments, it is possible to use a highly viscous lubricating oil with excellent lubrication performance that can cope with severe lubrication conditions. The durability of the material can be improved. Furthermore, since a lubricating oil with low viscosity can be used in the oil chamber of the shift device, the operating force can be reduced, and the operational feeling and operation followability can be improved. In addition, since the lubricating oil contamination caused by the rotation of the gears of the drive force transmission device does not affect the shift device in any way, the operability of the shift device is not hindered, which increases the degree of freedom in design and reduces costs. Without this, shift feeling and reliability can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of essential parts showing an embodiment of this invention, and FIG. 2 is an external side view showing an example of an outboard motor. 1...Casing, 2...Engine cover, 3
... Gear case, 5 ... Propeller, 8 ... Drive force transmission device, 9 ... Shift device, 10 ... Shift rod, 12 ... Slide shifter, 13 ... Slide pin, 14 ... Shifter dog, 15 ... Dog pin, 16... Forward gear, 17... Reverse gear, 18... Drive shaft, 19... Drive gear, 2
0... Propeller shaft, 21... Bearing box, 2
3,24...Oil chamber.

Claims (1)

[Scope of utility model registration request] A drive force transmission device that causes the rotation of the drive shaft to rotate forward, reverse, or neutrally to the propeller shaft by meshing the shifter dog with a forward gear or reverse gear and moving it to a neutral position;
In an outboard motor, the outboard motor includes a shift device having a shift cam for moving the shifter dog, and an oil chamber containing lubricating oil for lubricating the rotating sliding portion of the driving force transmission device and lubricating the sliding portion of the shift device. An oil chamber for an outboard motor, characterized in that an oil chamber for storing lubricating oil is formed into separate compartments, and lubricating oils having different performances are supplied to these oil chambers.