OUTBOARD MOTOR GEARBOX WITH ADDITIONAL LUBRICATION SYSTEM FOR DRIVE SHAFT BEARINGS

Abstract

This utility model relates to shipbuilding, specifically to the design of outboard motor gearboxes. An outboard motor gearbox with a drive shaft bearing supplementary lubrication system is designed to increase the service life of the outboard motor and reduce friction on the drive shaft bearing surfaces under long-term maximum loads. The technical result of using this utility model is an increase in the service life of the outboard motor and a reduction in operating costs, namely: reduced friction on the drive shaft bearing surfaces under long-term maximum loads, reduced wear on the gearbox working elements; reduced frequency of maintenance; reduced fuel consumption; increased service life of the outboard motor gearbox; and reduced requirements for the quality of the lubricants used.This technical result is achieved by additionally supplying lubricant to the drive shaft bearing components, specifically by providing at least one additional channel in the outboard motor's drive shaft gear. This channel allows the lubricant and coolant to effectively reach the working area of ​​the drive shaft bearing as the drive and output shaft gears rotate. These channels can have various sizes.

Description

[0001] The utility model relates to shipbuilding, in particular to the design of gearboxes for outboard motors.

[0002] The outboard motor gearbox with an additional lubrication system for the drive shaft bearing is designed to increase the service life of the outboard motor and reduce friction of the working surfaces of the drive shaft bearing under conditions of prolonged maximum loads.

[0003] Outboard motor gearboxes do not have a lubrication system for the drive shaft bearing (which is often a plain bearing or bronze bushing). However, this drive shaft bearing is sealed by the pinion gear, preventing oil from splashing onto it as the pinion and output shaft gears rotate.

[0004] Various outboard motors are known in the art for which the drive shaft bearing lubrication system is performed manually. Typically, this is accomplished by injecting lubricant through dedicated lubrication points (oilers or grease nipples) using a syringe.

[0005] Examples of such outboard motors are “TOHATSU” (operating manual published on the website https: / / tohatsu.site / ), “TOYAMA Marine” (https: / / www.toyama-marine.ru / download / T30ABMJET_manual.pdf), etc.

[0006] The disadvantages of existing gearbox designs are:

[0007] - increased friction of the bearing working surfaces under long-term maximum loads;

[0008] - change in working clearances during bearing operation;

[0009] - reduction of bearing life;

[0010] - increase in fuel consumption.

[0011] In addition, as a result of bearing wear, the drive shaft receives axial play, which leads to premature wear of the drive and driven gears and breakdown of the gearbox.

[0012] The proposed technical solution allows to eliminate the above mentioned shortcomings.

[0013] The technical result of using the claimed utility model is an increase in the service life of the outboard motor and a reduction in operating costs, namely:

[0014] - reducing friction of the working surfaces of the drive shaft bearing under conditions of long-term maximum loads, reducing wear of the working elements of the gearbox;

[0015] - reducing the frequency of maintenance;

[0016] - reducing fuel consumption;

[0017] - increasing the service life of the outboard motor gearbox;

[0018] - reducing the requirements for the quality of lubricants used.

[0019] The technical result is achieved by additionally supplying lubricant to the drive shaft bearing components. Specifically, the outboard motor's drive shaft gear has at least one additional channel. Ideally, two channels allow the coolant to effectively reach the working area of ​​the drive shaft bearing as the drive and output shaft gears rotate. The channels can have various sizes; the optimal channel diameter is 8 mm.

[0020] By providing lubrication to the drive shaft bearing, the following effect is achieved:

[0021] - reducing friction of the working surfaces of the drive shaft bearing under conditions of long-term maximum loads, reducing wear of the working elements of the gearbox;

[0022] - increasing the service life of the drive shaft bearing under long-term maximum loads;

[0023] - increasing the service life of the driving and driven gears;

[0024] - reducing fuel consumption.

[0025] The essence of the utility model is explained in Fig. 1, where:

[0026] 1 - gearbox housing;

[0027] 2 - drive shaft gear;

[0028] 3 - drive shaft;

[0029] 4 - output shaft gears;

[0030] 5 - output shaft;

[0031] 6 - gear shift clutch;

[0032] 7 - cutting fluid;

[0033] 8 - drive shaft gear channels;

[0034] 9 - drive shaft bearings.

[0035] Fig. 1 shows the operation diagram of the outboard motor gearbox.

[0036] The design of the outboard motor gearbox with an additional lubrication system for the drive shaft bearing comprises a gearbox housing 1, a drive shaft gear 2; a drive shaft 3; output shaft gears 4; an output shaft 5. The gears of the drive and output shafts are driven by a gear shift clutch 6. When rotating, the gears of the output shaft 4 engage with their teeth a lubricating and cooling liquid 7, which is located inside the gearbox housing. The drive shaft gear 2 has at least one channel 8 (a variant with two channels is shown in Fig. 1). As a result of the intensive rotational motion of the gears of the output and drive shafts 2 and 4, the lubricating and cooling liquid contained on the teeth of the gears of the output shaft 4 enters the working area of ​​the drive shaft bearings 9 through channel 8.

[0037] The design also includes output shaft bearings (not shown in Fig. 1).

[0038] The outboard motor gearbox with additional lubrication system for the drive shaft bearing operates as follows.

[0039] In the housing 1 of the gearbox, the gear 2 of the drive shaft 3 and the gears 4 of the output shaft 5 rotate when the gear shift clutch 6 is engaged in the sealed space of the housing 1, while the gears 4 engage the cutting fluid 7 with their teeth. When the gears of the drive and output shafts rotate, the cutting fluid is splashed by the gears inside the gearbox, partially turning into a finely dispersed structure, which through channels 8 into the gears 2 of the drive shaft 3 enters the operating area of ​​the bearing 9 of the drive shaft, which provides its additional lubrication, and, as a result, friction is reduced and the working surfaces of the bearing 9 of the drive shaft are cooled. Due to this, under maximum long-term loads, the service life of the bearing (and, as a consequence, the service life of the gearbox gears) is increased and fuel consumption is reduced.

Claims

An outboard motor gearbox with a system for additional lubrication of the drive shaft bearing, comprising a housing, a drive and output shaft with gears, a gear shift clutch, and a bearing system, characterized in that the drive shaft gear contains channels that allow the lubricating and cooling liquid to enter the working area of ​​the drive shaft bearing.

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