JPS5822399B2 - Senpaku Suishin Sochi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention generally relates to an apparatus for supporting a propeller for discharging exhaust gas "through", and more particularly, the present invention relates to a device for supporting a propeller for discharging exhaust gas "through", and more particularly, the present invention relates to A timing section unit that moves between positions spaced apart from each other back and forth to discharge exhaust gas behind the propeller when the propeller is in the forward position, and a timing unit with the propeller in the rear position, and a propeller spaced apart behind it. A marine propulsion system comprising a device supporting a propeller that exhausts "through the bub" of a propeller shaft VC so as to selectively vent exhaust gases in front of the propeller through a gap between the propeller shafts. This relates to the lower unit of the device.

An example of the prior art supporting a propeller that exhausts exhaust gases "through" is U.S. Pat.
U.S. Patent No. 3,457,051, granted September 16,
No. 3,563,670, issued February 16, 1971.

Also of note is U.S. Pat. No. 3,356,151, issued Dec. 5, 1967.

The present invention is adapted to vent exhaust gases "through the bub" and is adapted to support a propeller that can be moved axially between spaced forward and backward positions along the propeller shaft; A support device is provided that includes a device for biasing into position.

Thus, when the outboard motor or stern drive unit is started, exhaust gases are allowed to escape forward of the propeller through the gap between the propeller and the lower unit.

This escape of exhaust gases allows the propeller to be vented first, rapidly increasing the speed of the engine, thus increasing the propeller's rotation to a degree that would not be possible if it were not vented and the propeller was fully loaded immediately. Can increase speed.

Using the propeller support system of the present invention, when the propeller reaches a relatively high rotational speed, the propeller generates enough thrust to overcome the effects of the offset position and moves forward along the propeller shaft to close the gap. Therefore, the exhaust gas is prevented from being discharged any further and a sufficient load is applied to the propeller to discharge the exhaust gas in a manner similar to the prior art.

One principal object of the present invention is therefore to provide a propeller support system which reduces the load on the propeller through ventilation, and subsequently allows the ventilation to be discontinued and the load to be fully loaded quickly at relatively high rotational speeds. That's true.

This operation facilitates the use of high speed propellers and high gear ratios in high thrust applications such as water skiing.

Another object of the invention is to provide a propeller comprising means for moving the propeller between spaced positions on the propeller shaft relative to the propeller shaft and means for biasing the propeller to an aft position. It is to provide a support device.

Other objects and advantages of the present invention will be understood from the following description with reference to the accompanying drawings.

Before describing the invention, it should be noted that, since the invention may be embodied in various embodiments and carried out in various ways, it is limited to the structure and arrangement of parts that are illustrated in the following general description and in the accompanying drawings. It is important to understand that this is not something that can be done.

It should also be understood that the terminology used herein is illustrative only and not limiting.

The accompanying drawings show a marine propulsion system 11, which may be an outboard motor or a stern drive.

The propulsion device 11 includes a vertically swingable and horizontally steerable lower unit 13, similar to those of the prior art.

The lower unit 13 includes a normally submerged part 17, which part 17 has a rearwardly directed exhaust gas discharge opening or outlet 19.

A propeller shaft 21 is supported in the lower unit section 17 and includes a rear portion 23 extending to the rear of the lower unit 13 through an exhaust opening 19 .

The F-side unit 13 includes any suitable device for rotating the propeller shaft 21, including a vertically extending drive shaft 27 and a reversing rolling mechanism 29 connecting the drive shaft 27 to the propeller shaft 21. and can include.

The lower unit 13 is also provided with any suitable exhaust gas passage system 31 which communicates with the exhaust gas opening 19 and the exhaust port of the drive engine (not shown).

A propeller 33 is supported on the propeller shaft 21 for rotational movement therewith and for movement relative to the shaft in the axial direction of the shaft.
movable between a first forwardly positioned position shown in the figure and a second position shown in figure 1, the second position being spaced rearwardly from the first or forward position; Since it is located behind the exhaust opening 19, the propeller 3
3 and the lower unit 13 forms an annular gap 37 (FIG. 1), which gap 37 communicates with the exhaust opening 19.

The present invention is not limited to the particular propeller 33 as shown, but any suitable propeller having an axial exhaust passage including an inlet and an outlet may be modified to include the various features of the present invention.

The illustrated propeller 33 has an outer bub 39 from which one or more propeller blades 41 project, and is connected to the outer bub 39 by one or more radially extending vanes 47 (FIG. 3). The inner bubble 43 is spaced inwardly from the outer bubble 39 and forms an exhaust passage 49 between the outer bubble and the exhaust passage when the propeller 33 is in the forward position. Part 1 of unit 13
It has a forwardly located inlet 51 positioned in communication with an exhaust gas outlet opening 19 provided at 7 .

Furthermore, the exhaust gas passage 49 of the propeller 33 includes an outlet 53 located aft.

The propeller 33 is also enclosed between an inner sleeve 57 supported on the propeller shaft 21 for rotation in line with it and axially interlocked relative thereto, and between this sleeve and the inner bub 43 to form a slip clutch. It includes an elastic bouncing 59.

According to the invention, a device is provided for biasing the propeller 33 to a rearward position.

This device can have a variety of constructions, but in the example shown, the device is seated in an annular seat surrounding a portion 63 of the propeller shaft 21 and whose rear end is formed by the front end of the inner sleeve 57. The propeller shaft 21 consists of a coil spring 61 seated in a collar 67 which presses against a tapered portion 69 of the propeller shaft 21.

Therefore, the propeller 33 is normally biased to a rearward position.

A device is provided to prevent exhaust gas from exiting from the propeller outlet 53 when the propeller 33 is in the aft position.

This device can have a variety of constructions, but in the illustrated embodiment it is removably fitted around the propeller shaft 21 behind the internal sleeve 57 of the propeller 33 and is inserted near the rear end of the propeller shaft 21. It consists of a member or flange 71 that engages a chamfered portion 73 of the shaft.

The flange 71 includes a radially extending annular portion 77 including a series of circumferentially spaced holes, apertures or openings 79 extending from the upper end of the annular portion to provide exhaust air when the propeller 33 is in the aft position. It includes a forwardly projecting cylindrical portion 81 that engages with an annular recess 83 provided at the rear end of the inner knob 43 to prevent communication between the passage 49 and the mouth hole 79.

A recess 83 in the rear end of the inner bub 43 has a cylindrical outer surface 87 adapted to be an interference fit with the cylindrical portion 81 of the seven flange and extends radially outwardly from the front end of the outer surface 87. It is bounded by an annular surface 89.

The flange 71 also engages or is an interference fit with the outer bub 39 to close the outlet 53 of the exhaust gas passage 49 and seal the exhaust gas passage 49 from exiting when the propeller 33 is in the aft position. It also includes a side portion 91.

When the propeller 33 is in the forward position, the outer portion 91 of the flange is spaced from the rear of the outer side of the propeller to form an annular opening 55 for venting exhaust gases.

The flange 71 also acts as a device to limit rearward movement of the propeller 33 on the propeller shaft 21 by the biasing action of the spring 61 and is held against rearward movement away from the chamfered portion 73 of the propeller by a suitable device. In the structure shown, this flange retention device is comprised of a NAND 93 that engages a threaded portion 97 of the propeller shaft extending rearwardly from the chamfered portion 73, and a NAND 93 that engages a threaded portion 97 of the propeller shaft extending rearwardly from the chamfered portion 73; The pin 99 extends through a diametrical hole.

Nut 93 is preferably tightened to such an extent that flange 71 rotates with propeller shaft 21 so that no relative rotational movement occurs between outer tube 39 and flange 71.

Other devices may also be used 9 to rotate the flange 71 with the propeller shaft 21.

A device is also provided to prevent exhaust gas from exiting between the lower unit 13 and the propeller 33 when the propeller 33 is in the forward position.

Although the device can be of various constructions, in the construction shown it is bounded by a cylindrical surface 121 and an annular surface 123 extending radially outward from the rear end of this surface. An annular recess 119 provided on the outer surface of the bulb 39
Consists of.

When the propeller 33 is in the forward position, the cylindrical surface 121 extends into the exhaust gas opening 19 provided in the lower unit part 17 and the annular surface 123 forms a rearwardly directed edge around the exhaust gas exhaust opening 19. The lower unit 13 extends proximate to the lower unit 13.
This prevents exhaust gas from coming out between the propeller 33 and the propeller 33.

A device is provided to prevent the propeller 33 from moving forward 5 relative to the propeller shaft 21.

Although the device can have a variety of constructions, the construction shown includes a cylindrical outer surface 131 that engages a cylindrical inner surface 133 at the forward end of the propeller's inner bub 43;
9 protrudes from the forward end of this outer surface 131 and engages the forward end of the propeller's internal bub 43 to limit forward movement of the propeller 33 in the axial direction of the propeller shaft 21 radially outwardly. a rearwardly facing annular recess 129 bounded by an extending annular surface 137;
It consists of 67 girder collars.

A seal 151 in the form of an O-ring 151 is provided between the propeller shaft 21 and the inner sleeve 5T.

Furthermore, bushings can be provided along the rear end of the inner sleeve 57 and also in the annular recess 129v of the collar 67.

If desired, a deflection ring 153 as described in U.S. Pat. No. 3,356,151 can be provided at the rear of the propeller outer bub 39 as described by Ohki in the aforementioned U.S. Pat. No. 3,356,151.

Additionally, a deflector ring 155 similar to but oppositely oriented as deflector ring 153 as generally shown is provided near the radially extending surface 123 on the rear end of the propeller outer/-, blade 39. can be established.

To explain the operation, when the drive engine is not operating, the propeller 33 is positioned at the rear position by the spring 61.

When the engine starts, the exhaust gas passage 4 of the propeller 33
9 is prevented by the cylindrical portion 81 of the flange 710 engaging the internal propeller bub 48 and the radially outwardly extending portion 91 of the flange engaging the external propeller bub 39. be done.

However, the propeller 33
Since the gap is increased rearward from the gap 37, exhaust gas can be exhausted from the gap 37 to the front of the propeller 33.

Initial propeller venting, as occurs when propeller 33 is in the aft position, rapidly increases propeller shaft 210 rotational speed.

When the propeller 33 rotates quickly like this, the propeller 3
3 forward on the propeller shaft 21 to a forward position that prevents exhaust gases from exiting between the section 17 of the F-side unit and the front end of the propeller 33, and when the propeller is in this forward position, the propeller 33 an exhaust gas passage 49 provided in the flange 71, a mouth hole 79 provided in the flange 71, and an annular opening 55 extending in the axial direction formed between the flange 71 and the rear end of the outer bubble 39 of the propeller. Exhaust gas is emitted from the street.

The initial rapid increase in propeller rotational speed provided by the present invention is particularly desirable for use in high thrust applications such as water skiing.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway, partially sectional view of a lower unit of a water propulsion device showing an enlarged view of a propeller support device having various features of the present invention; FIG. 2 is similar to FIG. 1; is a partial view showing parts of the propeller support device in different positions, and FIG. 3 is a partial end view showing the propeller support device of FIG. 1 with some parts cut away and some parts shown in cross section. 11...Propulsion device, 13...Lower unit, 17...Lower unit part, 19...
... Gas opening, 21 ... Propeller shaft, 27, 29°°° ... Rotating device, 31 ...
・Guide device, 33... Propeller, 49...
...Cass passage, 51... Entrance, 53...
- Exit, 61... Biasing device.

Claims (1)

[Claims] 1 In a normal running condition (8) a lower unit submerged in water and having a rearwardly facing exhaust gas opening, and a propeller supported by the lower unit and extending rearward through the exhaust gas opening.・The shaft and the propeller・
a device for rotating the shaft; a device for guiding exhaust gas to the F-side unit; and a device attached to the propeller shaft behind the exhaust gas opening provided in the F-side unit so as to rotate therewith; a propeller movable between a first forwardly positioned position and a second position rearward of the first position and spaced rearwardly from the exhaust gas opening of the lower unit portion; a device for biasing a propeller to the second position, the propeller being disposed at a forward end of the propeller in communication with the exhaust gas opening when the propeller is in the first position. A marine propulsion system including an exhaust gas passageway having an inlet and an outlet positioned further aft.