JPS62261594A - Bearing device for outboard jet screw - Google Patents

Abstract

PURPOSE:To prevent the phenomena of sliding and rubbing from occurring through supporting surely thrust and radial loads by engaging the first bearing to a step portion provided axially on an engine output shaft and giving fitting pressure axially at a time of the second bearing fitting. CONSTITUTION:A thrust load which occurs in the downward direction, that is, in the impeller direction due to the rotation of an impeller 32 is surely supported at the first bearings 38, which is engaged with the lower surface of a flange 41, and the up and down movements of an output shaft 30 is controlled. Accordingly, a clearance between the impeller 32 and liner 45 provided in the outer perimeter thereof can be properly set. Also, a radical load which occurs at the output shaft 30 due to want of balance of the wing shapes of the impeller 32 is surely supported with the second bearing 40 given fitting pressure and fixed, thus the occurrence of the phenomena of sliding and rubbing is prevented, resulting in the control of alien sounds, excessive attrition or the like of the bearing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an outboard jet propulsion machine, and more particularly to a bearing device that rotatably supports an output shaft of an engine.

[Conventional technology] Outboard/na/lid thrust: IF lift l:t A centrifugal or axial type pump unit is installed in place of the normal canterwheel lift propeller and gear case part, and This is a type of ship propulsion mechanism that injects high-pressure water and obtains propulsive force from the reaction. Here, the rotational power generated by the engine is directly transmitted to the impeller of the pump unit via the engine output shaft, and the rotation of this impeller applies injection pressure to the water flowing in from the water intake, which is then transferred to the outside. It is designed to be injected into the air.

In such an outboard shelving propulsion system, the engine output shaft is rotatably supported by a bearing, or
As the impeller rotates via the engine output shaft, a thrust load in the axial direction and a radial load in the radial direction are applied to the engine output shaft due to the imbalance in the shape of the blades of the impeller. Therefore, the bearing described in +iii can sufficiently support these thrust loads as well as the radial load. Conventionally, this point has not been perfect, whether it is required to have a structure that does this.

First, in the past, angular ball bearings were used to receive the thrust load of the output shaft, and with this structure, even if a slight radial load was applied to the output shaft, the bearing part of the angular ball bearing This has the drawback of causing a so-called rubbing phenomenon, which significantly shortens the life of the bearing. Furthermore, based on this drawback, since the vertical movement of the output shaft cannot be completely restricted, there is also the drawback that it is difficult to set a gap between the impeller and the liner disposed around the outer periphery of the impeller.

[Problems to be solved by the invention] The present invention has been made in view of the problems of the conventional technology as described above, and its purpose is to reduce the thrust load generated by the rotation of the impeller and the blades of the impeller. An object of the present invention is to provide a bearing device for an outboard shelving propulsion device that reliably supports a radial load caused by an imbalance in shape and supports an engine output shaft in a smoothly rotatable manner.

[Means for Solving the Problems] The present invention provides an outboard jet propulsion machine in which an impeller is connected to the engine output shaft and obtains propulsive force by injecting wood pressurized by the rotation of the impeller. At least the first. The engine output shaft is rotatably supported by a second bearing, and the engine output shaft is provided with a stepped portion in the axial direction, and the first bearing is disposed to engage with the stepped portion, and the second bearing is provided with a shaft. It has a structure that applies mounting pressure to the second bearing in the direction.

[Function] According to the configuration of the bearing device for an outboard jet propulsion device according to the present IJI, since the first bearing is engaged with the stepped portion in the axial direction, The thrust load on the engine output shaft can be supported by the bearing, and the second bearing is provided with mounting pressure, so the radial load is supported by the second bearing, causing a so-called grinding phenomenon. It prevents

[Example] Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

Note that FIG. 1 shows an enlarged embodiment of a bearing device for an outboard jet thruster according to the present invention, and FIG. It is.

First, in FIG. 2, the outboard jet propulsion device 10 includes an upper unit 14 having an engine cover 12 at its upper end that covers the engine, and a pump unit 16 as a lower unit attached to the lower part of the upper unit 14.
It is equipped with

The upper unit 14 is supported by a swivel 18, and this swivel 18 is swingably attached to a clamp bracket 20 via a pivot pin 19, and this clamp bracket 20 has a structure fixed to a stern plate 22 of the hull. It has become. by this.

The outboard shelving propulsion @io is swung up and down around a pivot pin 19 and can be tilted up or down. It should be noted that FIG. 2 shows the state indicated by the two-dot chain line or the chilled amplifier state of the outboard jet propulsion device IO. Reference numeral 24 denotes a water intake port, and the water taken in from this water intake port is rotated by an impeller or engine located in the pump unit 16 to increase the pressure, and is injected to the outside via a rear injection nozzle 26. This gives it a driving force. A reverse packet 28 is swingably attached to the injection nozzle 26, and this reverse bucket 28 is attached to the injection nozzle 26.
By covering it, it is possible to obtain backward propulsion.

In FIG. 1, the reference numeral 30 indicates an engine output shaft, which is connected to the crankshaft of the engine in the upper part of FIG. 2, although not shown. This engine output shaft 30 extends through the upper unit 14 to the pump unit 16, and has an impeller 32 attached to its lower end. Reference numeral 34 denotes a volute chamber integrally formed by the casing 36 of the pump unit 16, and this volute chamber 34 guides water pressurized by the impeller 32 to the injection nozzle 26 in FIG. 2.

The engine output shaft 30 is located within the pump unit 16,
It is rotatably supported by a bearing 38 of ff1l and a second bearing 40. These bear links 38
．． In this embodiment, both 40 are angular roller bearings, which are disposed within an oil chamber 42 integrally formed with the casing 36, and whose outer periphery is held by the casing 36. The first bearing 38 on the upper side in FIG.
In this embodiment, the stepped portion provided on the flange 41 is arranged so as to engage with the side surface of the collar 41, and supports the downward thrust load acting on the engine output shaft 30 due to the rotation of the impeller 32. In addition, the second bearing 40 on the lower side of FIG. 1 is held from below by a bearing nut 43 screwed onto the output shaft 30 with appropriate mounting pressure. It is designed to support the radial load.

Note that these bear links 38 and 40 do not need to be limited to angular roller bearings as in this embodiment.
For example, a ball bearing may be used instead, but an angular bearing is preferable in order to support thrust load and radial load respectively.

An oil seal 46 sandwiched by an oil seal housing 44 is disposed above the first bearing 38, while a second bearing 40 on the lower side
An oil seal 50 sandwiched between another oil seal housing 48 is disposed below the oil seal housing 48, thereby sealing the oil chamber 42 from the outside. The oil chamber 42 thus divided is communicated with the outside via an oil supply/discharge passage 52 formed integrally with the casing 36, and this oil supply/discharge passage 52 is normally is closed by being screwed into the stopper 54 from the outside. Lubricating oil is supplied to and discharged from the oil chamber 42 through this oil supply and discharge passage 52, and the oil chamber 42 is normally filled with oil.

The reference numeral 56 indicates a plug that closes the air vent hole of the oil chamber 42, 58 indicates a cooling water pump that supplies engine cooling water to the engine, and 6o indicates a nut that fixes the impeller 32 to the engine output shaft 3o. be.

According to the above embodiment, the thrust load generated in the downward direction, that is, in the direction of the impeller due to the rotation of the impeller 32, is
Since the first bearing 38 is engaged with the lower surface of the collar 41, it is reliably supported there, and the vertical movement of the output shaft 30 is restricted. As a result, the impeller 32 and the impeller 3
This can be done by setting an appropriate gap between the liner 45 and the liner 45 disposed around the outer periphery of the cover 2. In addition, the radial load 41 generated on the output shaft 30 due to the unbalanced blade shape of the impeller 32 is reliably supported by the second bearing 40 that is fixed under the application of mounting pressure, thereby preventing the occurrence of so-called grinding phenomenon. This makes it possible to suppress abnormal bearing noise and excessive wear.

[Effects] As described above, according to the present invention, the ml bearing is secured to the stepped portion formed on the engine output shaft, and the second bearing link is fixed by applying mounting pressure. With its simple structure, it can reliably support the thrust load and radial load generated on the engine output shaft.
This not only increases the life of the bear link, but also has the excellent effect of smoothly supporting the engine output shaft.

[Brief explanation of drawings]

tt-a is a cutaway front view showing one embodiment of the bearing device for an outboard shet propulsion device according to the present invention, and FIG.
FIG. 1 is a front view showing the entire outboard jet propulsion device to which the invention is applied. IO... Outboard jet propulsion machine 30... Engine output shaft 32... Impeller 38... First bear link 40... Second bear link 41... Boxwood 43 as a step part.・・Bearing nut 45・・Liner

Claims (1)

[Claims] In an outboard jet propulsion machine in which an impeller is connected to an engine output shaft and obtains propulsive force by injecting water pressurized by rotation of the impeller, the engine output shaft is connected to at least a first
The engine output shaft is rotatably supported by a second bearing, and the engine output shaft is provided with a stepped portion in the axial direction, and the first bearing is disposed to engage with the stepped portion, and the second bearing is provided with a shaft. A bearing device for an outboard jet propulsion machine, wherein a mounting pressure is applied to the second bearing in a direction.