JPS62273196A - Outboard jet propelling device - Google Patents

Abstract

PURPOSE:To make it possible to facilitate the maintenance and inspection of an outboard jet propelling device and the replacement of a lower unit, by forming upper and lower units as independent assemblies, respectively, and by coupling them with each other through the intermediary of an attaching plate having attaching sections projected outward. CONSTITUTION:Upper and lower units 12, 10 are formed as independent assemblies, respectively. The lower unit 10 incorporates therein an engine power take-out shaft, a cooling water pump, a reverse bucket 24 and a lever mechanism therefore. An attaching plate 66 is disposed between the upper and lower units 12, 10. A plurality of attaching holes are formed in the attaching plate 66 in the vicinity of the outer periphery edge thereof, and therefore, the attaching plate 66 may be attached to the upper unit 12 by means of attaching bolts 76. Further, a plurality of flange sections 68 are formed in the attaching plate 66, projecting outward, and therefore, the plate 66 may be fastened to the lower unit 10 by means of attaching bolts 72 piercing through holes formed in the flange sections 68. With this arrangement, the upper and lower units 12, 10 may be separated only by removing the bolt 72, thereby it is possible to facilitate the inspection and maintenance of the outboard jet propelling unit.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an outboard jet propulsion system, and particularly relates to the installation of an upper unit and a lower unit constituting an outboard jet propulsion system. Regarding structure.

[Prior Art] An outboard jet propulsion device is equipped with a centrifugal or axial pump unit in place of the propeller and gear case of a normal outboard motor, and injects high-pressure water backward in the direction of travel. This is a type of ship propulsion structure that uses the reaction force to obtain propulsion force. Here, the rotational power generated by the engine installed in this propulsion bag, this upper unit, is transmitted to the impeller in the lower unit via the engine output shaft extending from the upper unit to the lower unit. The rotation applies injection pressure to the water flowing in from the water intake opening opening below the lower unit, and the water is injected to the outside through the volute chamber formed by the casing of the lower unit and the injection nozzle 11a. There is. In addition, a reverse packet for reversing the propulsion direction is attached to the normal injection nozzle, and by opening this reverse bucket or injection nozzle, forward propulsion force is obtained, and by covering the reverse bucket or injection nozzle, the jet flow is directed toward the ship. By injecting it forward, backward propulsion is obtained.

Here, the outboard jet propulsion system is equipped with the volute chamber, and since this volute chamber is bulky, it is not possible to adopt a structure in which the upper unit and the lower unit are simply assembled like a propeller-type outboard motor. Therefore, in the past, it was not possible to simplify the mounting structure of each component. Therefore, when performing maintenance and inspection on this device, the lower unit must be removed from the upper unit, or with conventional systems, some or all of the components that make up the lower unit must be disassembled before the lower unit can be removed from the upper unit. It could not be separated from the unit. In particular, in the past, the mounting bolts for the lower unit to the upper unit were usually provided inside the impeller, so when separating the lower unit, the impeller was first removed and then the mounting bolts were removed. Work was needed. Also, the bolt on the lower unit side
Some of the link mechanisms that operate the reverse bucket are attached to the upper unit side, so it is necessary to remove these link a structures every time maintenance and inspection is carried out, and when reassembling them, adjustment of this link mechanism is required. I had to do it again.

Therefore, in the past, this maintenance and inspection work required a great deal of time and effort.

[Problems to be Solved by the Invention] The present invention has been made in view of the problems of the prior art as described above. It is possible to assemble and disassemble the jet propulsion device, especially to remove the lower unit from the upper unit, with simple operations and in a short time, thereby facilitating maintenance and inspection work of the device. .

[Means for solving the problem of m points] The present invention transmits the power of the engine in the upper unit to the impeller in the lower unit via the engine output shaft, and the water pressurized by the rotation of the impeller is sent to the volute chamber. In an outboard shelving propulsion device that obtains propulsive force by injecting air through a A mounting plate is interposed between the mounting plate and the mounting plate, and the mounting plate is formed with a mounting portion that projects outward, and is fixed to the mounting plate or the lower unit from the outside via the mounting portion by the mounting means. It has a structure.

[Function] According to the above configuration of the present invention, when assembling the present outboard jet propulsion device, all that is required is to attach the mounting plates 1 to 1 to the upper unit via the mounting means, and to attach the lower unit to the mounting plate using the mounting means. Furthermore, if maintenance or inspection is required, at least the lower unit can be easily removed from the upper unit as a single assembly by removing the attachment means.

The present invention will be explained below based on embodiments shown in the drawings.

FIG. 1 is a front view showing the entire outboard jet propulsion device according to the present invention, and the device is mainly composed of a lower unit 10 and an upper unit 12. As shown in FIG. The lower unit 10 has an impeller 14 built-in,
This impeller 14 is rotationally driven by an engine within an engine cover 16 mounted on the top of the upper unit 12.

As a result, water is sucked in from the water intake port 18 that opens at the bottom of the lower unit 10, and the pressure of the water is increased.The pressurized water is then sent to the rear through the volute chamber 20 and from the injection nozzle 22 that opens toward the rear of the ship. It is designed to be injected as r1r4IjL. This injection nozzle 22
The reverse packet 24 is swingably attached to the reverse packet 24 via a swinging arm 26, and the swinging arm 26 is rotated via an operating rod 28 to a first lever 30 mounted on the front side of the lower unit 10. movably connected. It is connected to the rice bar and can swing back and forth about the shaft 32, thereby moving the reverse packet 24 to the nozzle 22. The swing arm 26 is rotatably connected to a deflection plate 25 via a rod 34, and this deflection plate is connected to a notch (not shown) formed in the reverse packet 24. ) is provided to open and close, and the water injected from the injection nozzle 22 can be guided in an appropriate direction to obtain a backward propulsion force or a neutral state for the ship.

FIGS. 2 to 4 show the detailed structure of the lower unit 10, in which reference numeral 36 designates the engine output shaft. This engine output shaft 36 extends to the upper part of the upper unit 12 shown in FIG. 1, and is connected to the crankshaft (not shown) of the engine here. The impeller 14 is attached to the engine output shaft 36 at its lower end. The volute chamber 20 is integrally formed with the casing 38 of the lower unit IO, and forms a spiral passage as shown in FIG. It is designed to guide you towards.

In FIG. 3, reference numeral 21 designates a water channel on the downstream side of the volute chamber 20, which communicates with the injection nozzle 22.

Reference numeral 23 designates an exhaust passage that is also integrally formed with the casing 38, and the upstream side of the exhaust passage is an exhaust passage 27 that is defined at the joint between the upper unit and the lower unit, and is connected to the exhaust gas of the engine in the upper unit. It communicates with a hole (not shown). The downstream side of the exhaust path 23 is connected via the injection nozzle 22 to a reverse packet 24 or a reverse packet 24 in a state covering the nozzle 22 as shown in FIG.
It communicates with an exhaust port 31 formed integrally with the.

Further, as shown in FIG. 3, the engine output shaft 36 is rotatably supported within the lower unit IO by bearings 40 and 42, and these bearing songs are disposed within an oil chamber 44 integrally formed by the casing 38. has been done.

The bearing 4o on the upper side of the figure is attached so as to engage with the lower surface of a collar 41 provided on the engine output shaft 36, thereby receiving the thrust load generated on the engine output shaft 36. There is. Further, the bearing 42 on the lower side of the figure is fixed with mounting pressure applied by a bearing nut 43, thereby receiving a radial load acting on the engine exit shaft 36. Above the bearing 40 is an oil seal 4.
On the other hand, another oil seal 48 is provided below the bearing 42, whereby the oil chamber 44 integrally formed by the casing is sealed from the outside. Reference numeral 52 indicates an oil supply/discharge path;
Lubricating oil is supplied to or discharged from the oil chamber 44 through this oil supply/discharge passage 52, and normally this oil supply/discharge passage 52 is closed by a stopper 54. Also, code 58. indicates a cooling water pump, and this cooling water pump 58 is driven by the engine output shaft 36, sucks up a portion of the water from the water intake 18, and supplies the cooling water to the cooling water pipe 56 (see FIGS. 2 and 4). Cooling water is supplied to the engine via the engine. In FIG. 2, the reference numeral 57 is a stopper attached to the wash water supply port communicating with the cooling water pipe 56, and in FIG. This is Natsuto.

Referring to FIGS. 2 and 3, the first lever 30 for swinging the reverse packet 24 is connected to the shaft 32.
This shaft 32 extends into the lower unit 10 and is fitted with another short second lever 62 there. The free end of this second lever 62 is connected to a lifting rod i54 extending substantially parallel to the engine output shaft 36, and this! A, descending rocker 64 is connected to a lever (not shown) for reverse operation switching operation and is adapted to be raised and lowered. Therefore, by raising and lowering the lifting rod 64, the second lever 62. The first lever 30 is connected to the shaft 32 via M32.
Back and forth! fi, thereby causing the reverse packet 24 to swing via the swing arm 26. At the same time, the swinging of the swinging arm 26 causes the deflection plate 25 of the reverse packet 24 to swing appropriately via the rod 34.

As described above, the lower unit 10 includes the engine output shaft 36, the cooling water cylinder S8,
At least includes the reverse packet 24 and a lever 30.62 as a link mechanism for swinging the reverse packet,
Therefore, simply by removing the lower unit IO from the upper unit 12, these constituent members are exposed to the outside.

This lower unit IO is configured to be attached to the upper unit 12 via an attachment plate 66. As clearly shown in FIG. 4, this mounting plate 66 is provided with a plurality of mounting holes 74 slightly inside its periphery. It is for attaching to 12. Furthermore, this mounting plate 66 has a plurality of flange portions 68 projecting outward from its periphery as a mounting portion, and each of these flange portions 68 has a mounting hole 70. These mounting holes 70 are for fixing the mounting plate 66 to the lower unit 10, and mounting bolts 72 serving as mounting means are screwed to the lower unit 10 through the respective mounting holes 70.

As described above, the flange portion 68 and the mounting hole 70 for mounting the mounting plate 66 to the lower unit IO are provided in a state that projects outward from the mounting plate 66, so that the entire lower unit 10 is Even if it is bulky, at least the attachment plate 66 and the lower unit 10 can be attached and detached without the need to dismantle any other members, and therefore, at least the attachment plate 66 is attached to the upper unit.

The lower unit 10 can be easily separated from the upper unit 12. Preferably, the mounting plate 66
The mounting hole 74 for mounting the to the upper unit 12 is also
It is advisable to install it in a location where workers can easily reach it from outside.

In the above embodiment, when attaching the lower unit 10 to the mounting plate 66, the bolts 72 are tightened from above, or conversely, the bolts are made to protrude upward from the lower unit 10 in advance and the bolts 72 are tightened from above. Mounting hole 7
0 and may be fixed with a nut or the like.

[Effect] As described above, according to the present invention, the lower unit is attached to the upper unit via the attachment plate, and the attachment plate is attached to the lower unit from the outside by the attachment means via the attachment portion projecting outward. Because it is fixed to the unit, even if it is bulky due to the presence of the lower unit or volute chamber,
The operator can remove the lower unit from the upper unit by simply removing the mounting means from the outside and without disassembling other parts, making maintenance and inspection operations extremely easy and quick. I can do what I want to do on time.

Because it is interposed between the lower unit and the knit, it is easy to replace the lower unit with another lower unit. It has the excellent effect of being able to replace the lower unit of an outboard motor.

[Brief explanation of drawings]

FIG. 1 is a front view showing an entire embodiment of an outboard jet propulsion device according to the present invention, FIG. 2 is an enlarged front view showing a third lower unit of the same embodiment, and FIG. FIG. 4 is a front view showing a main part of the figure cut away, and FIG. 4 is a sectional view taken along the line rV-IV in FIG. 2. lO...Lower unit 12...Upper unit 14...Impeller 36...Engine output shaft 66...Mounting plate 72.76...Mounting bolt

Claims (1)

[Claims] Outboard jet propulsion system that transmits power from the engine in the upper unit to the impeller in the lower unit via the engine output shaft, and obtains propulsive force by injecting water pressurized by the rotation of the impeller through the volute chamber. The upper unit and the lower unit are each formed into a single assembly, the volute chamber is formed in the lower unit, a mounting plate is interposed between the upper unit and the lower unit, and the mounting plate has an external part. The outboard jet propulsion device is provided with a mounting portion projecting toward the outside, and is fixed to the mounting plate or the lower unit from the outside via the mounting portion by mounting means.