JPS5836180B2 - Gendoukino Riyutai Governor Sochi - Google Patents

Description

Detailed Description of the Invention When a small high-speed sports boat equipped with a water jet propulsion device is running on water, when the boat jumps due to waves or swells, the impeller in the water jet propulsion device temporarily spins and For example, an impeller shaft that was previously rotating at 6,000 rpm may suddenly reach 10,000 rpm or more.

If the engine speed increases rapidly in this way, there is a risk that various parts of the engine may run out of oil or seize, and the pilot may receive a large shock during the next splashdown, which may impair safety. In order to eliminate such problems, a governor device is required to regulate the maximum no-load rotation speed.

However, in order to accurately regulate the engine speed that rapidly increases under no-load conditions, it is necessary to supply a strong signal corresponding to the engine speed to the governor, but conventional governor devices cannot fully satisfy the above requirements. There was a problem where it was not possible.

That is, for example, when detecting the rotation speed using oil pressure generated by a gear pump, the structure is complicated and the cost is high, and the operation is likely to be unstable, especially in a high-speed range.

It is known that a governor is actuated by the negative pressure generated in the inlet manifold, but depending on the engine, the negative pressure does not necessarily increase with rotation, and it is not suitable for regulating the maximum no-load rotation speed.

When detecting rotation speed using a centrifugal governor, it is necessary to connect the governor input section (rotation speed detection section) and the governor actuation section with a link mechanism, and there are significant restrictions on the relative positional relationship and direction of the input section and actuation section. Become.

Problems that take up a lot of space cannot be avoided.

The present invention focuses on the fact that when a liquid is rotated together with a shaft, a pressure proportional to the square of the rotational speed is generated on the outer periphery of the liquid, and attempts to solve the conventional problems by using the above pressure as input to the governor. This will be explained next with reference to the drawings.

In Fig. 1, 1 is a prime mover mounted in the engine room of a small high-speed boat, 2 is a coupling, and 3 is a driven shaft driven by the prime mover 1 via the coupling 2. An impeller (not shown) is fixed within the water jet propulsion device.

The shaft 3 is supported by a bearing box 5 via two ball bearings 4, 4, and the bearing box 5 is fixed to a support leg 6.

1 has 6 blades, and the central boss 1' has ball bearings 4, 4.
It is fixed onto the shaft 3 between the holes by means of press fitting or the like.

Reference numerals 8 and 9 are integral casings fixed to the bearing box 5, which face the blades 7 and the boss I' with a slight spacing, forming a sealed cylindrical chamber 10 around the shaft 3. .

Reference numeral 11 denotes an axial groove provided at the right end of the boss 7', the left end of which opens between the two adjacent blades 1 and 7, and the right end of which opens into an annular recess 12 provided on the right side of the casing 9. It opens into the ball bearing 4 through the.

The gap 14 between the ball bearing 4 and the oil seal 13 communicates through a hole 15 drilled in the bearing box 5 and a conduit 16 to a reserve tank 17 that is open to the atmosphere and is provided at a position slightly higher than the bearing box 5, thereby allowing the reserve tank 17 to be opened to the atmosphere. The lubricating oil 18 in the tank 17 is supplied to the ball bearing 4 by the action of gravity, and constantly fills the room 10 through the groove 11.

Lubricating oil is supplied to the left ball bearing 4 through a small gap 19 between the boss 7' and the casing 9.

20 is a pressure outlet hole provided in the casing 8. room 10
The diaphragm 2 is opened in the outer periphery of the converter 23 through the hole 21 provided in the bearing box 5 and the conduit 22.
The pressure chamber 25 below the pressure chamber 4 is supplied as a governor input.

26 is a central plate of the diaphragm 24, 61 is an atmosphere vent L, 27 is a plunger fixed to the plate 26, 28 is a governor arm, and 29 is a governor spring.

The reason for providing a narrow gap between the blades 7 and the casings 8 and 9 is to reduce the amount of fluid that flows over the outside of the blades when the blades 7 rotate in the chamber 10, so that the entire fluid rotates with the axis. It is.

When the prime mover 1 is started and the shaft 3 is rotated via the coupling 2, the impeller at the right end of the shaft 3 rotates within the duct of the water jet propulsion device, a water jet is generated, and the ship receives propulsion force.

On the other hand, when the shaft 3 rotates, the blade 7 integrated with the shaft 3 also moves into the chamber 10.
The oil filling the chamber 10 also rotates at the same speed as the blade 7.

In this way, the oil in the room 10 can be considered as a rotating fluid, so the pressure at the outer periphery caused by centrifugal force p (kg/
ffl ) is given by the following formula.

However, ρ: fluid density (kg・SeG2/CrfI4),
ω: rotation 2πN angular speed = −, N: rotational speed tpm, r2: outer radius of fluid 60 (cIrL), r1: inner radius of fluid (Cr
(IL) That is, the pressure p generated at the outer periphery of the chamber 10 is proportional to the square of the rotation speed, and increases rapidly as the rotation increases, so it is convenient as an input to the governor.

This pressure is taken out from the holes 20, 21 and supplied to the pressure chamber 25 of the converter 23 via the conduit 22, where it is used to control the maximum rotational speed.

Since the interior of the room 10 is always supplied with lubricating oil from the reserve tank 17, even if the rotation of the shaft 3 exceeds the rated rotation speed and the converter 23 is activated, or if a leak occurs in a part, the interior of the room 10 will be refilled. is always filled with lubricating oil, and a pressure p corresponding to the rotational speed of the shaft 3 is always generated at the outer periphery of the chamber 10.

Here, the reserve tank 17 is open to the atmosphere, and there is also an atmosphere open hole 61 in the empty space above the pressure chamber 25. The diaphragm 24 is operated at the same gauge pressure as this pressure p and therefore operates in accordance with the rotational speed.

Next, an example of the structure of the governor operating section will be explained.

In FIG. 3, the throttle cable 31 consists of an outer cable 32 and an inner cable 33. A male thread provided at the end 32a of the operating side A of the outer cable 32 is fitted into a hole in a flange 34, and the flange is connected with a nut 35'. It is fixed at 34.

The male screw provided on the end 32b of the outer cable 32 on the motor side B is screwed into the screw hole of the connector 35, and the nut 3 is screwed into the screw hole of the connector 35.
It is fixed at 6.

The connector 35 passes through a hole in the link 3T having an L-shaped cross section, and is fixed to the link 37 by nuts 38 on both sides of the link 37, and the link 37 is connected to the governor arm 28 via a pin 39 as shown in FIG. .

A pipe-shaped terminal 41 is welded to the connector 35, and its tip is connected to a terminal 43 at the tip of the throttle arm 42.
are in conflict with each other.

A fork 44 is fixed to the tip of the rod 41 and guides the terminal 43.

45 is a throttle valve, 46 is a shaft connecting the valve 45 and the throttle arm 42, 47 is a carburetor, and 48 is a return spring that applies elasticity to the throttle arm 42 in the direction of closing the throttle valve 45.

The end of the inner cable 33 on the motor side is a terminal 43
The operation side end is connected to a throttle lever 51 via a pin 50.

52 is a fixed support shaft.

54 is a support shaft to which the governor arm 28 is fixed.

A speed setting screw 56 connected to the arm 28 via the governor spring 29 passes through a hole in the fixed bracket 5T, and is positioned by the upper and lower nuts 5B of the bracket 57.

59 is a speed setting scale. The support shaft 54 is integrally equipped with a cam 60.
The plunger 2 of the converter 23 is mounted on the surface of the cam 60.
7 is in contact.

FIG. 3 shows the starting acceleration state of the boat, where the throttle lever 51 is rotated fully in the direction of the arrow around the support shaft 52, and this operating force is applied to the pin 50, inner cable 33,
Via the terminal 43, it is transmitted to the throttle arm 42 against the elasticity of the return spring 48, the throttle arm 42 rotates clockwise about the shaft 46, and the throttle valve 45 is in the fully open position.

At this time, the position of the connector 35 with respect to the link 37 is adjusted so that the terminal 43 abuts the tip of the pipe-like rod 41.

The governor spring 29 is made sufficiently stronger than the return spring 48, and during the low ship speed at the beginning of starting, the moment caused by the governor spring 29 to rotate the governor arm 28 clockwise about the support shaft 54 is applied. Pressure chamber 2
The hydraulic pressure acting on the plate 26 causes the plunger 27 to push up the cam 60 and rotate the governor arm 28 counterclockwise around the support shaft 54.
is seated on a stopper inside the case as shown.

When the prime mover exceeds the rated rotation speed, such as when a ship jumps, a pressure proportional to the square of the rotation speed obtained by the device shown in Fig. 1 acts on the pressurizing chamber 25, and the moment caused by the plunger 27 is applied to the governor spring. 29, the governor arm 28 rapidly rotates counterclockwise about the support shaft 54.

The movement of the governor arm 28 is controlled by a link 37, a connector 35,
The gas is transmitted to the terminal 43 via the rod 41, the throttle arm 42 rotates counterclockwise about the shaft 46, and the throttle valve 45 narrows the cross-sectional area of the fuel gas flow path, thereby decelerating the engine.

In this way, when the prime mover exceeds its rated rotational speed, deceleration is quickly and reliably performed.

As explained above, the present invention generates a pressure p''2ρω2 (r22-r12) proportional to the square of the rotational speed by rotating fluid with an impeller, and uses this as a governor input. , it is possible to obtain an excellent governor input to prevent the prime mover rotation speed from rapidly increasing in the event of a ship jumping.

In other words, the operation of the governor is ensured, and it is possible to prevent seizures, wear and tear on various parts, and shocks to the operator due to idling.

Furthermore, the structure for obtaining the governor input becomes simpler and costs are reduced.

There is no need to connect the governor input part and the actuating part with a link mechanism,
It is sufficient to simply connect them with a conduit, and the input section can be provided on a driven shaft that is separate from the prime mover as in the embodiment, and there is an advantage that there are no restrictions on the relative positional relationship and direction of the input section and the actuating section. .

If the lubricating oil is used as a working fluid in a small space in the bearing section as shown in FIG. 1, the device becomes even more compact.

[Brief explanation of the drawing]

1 is a longitudinal cross-sectional view of the input section of the device according to the present invention, FIG. 2 is a cross-sectional view taken along line I-IF in FIG. 1, FIG. 3 is a longitudinal cross-sectional view of the governor operating section, and FIG. It is an enlarged cross-sectional view of IV-IV. 3...1 driven shaft, 10...Room, 7
...Blade, 22...Conduit, 24...
...Diaphragm, 25...Pressure chamber, 29.
...Governor spring, 42...Throttle arm (motor output control lever).

Claims (1)

[Claims] 1. A sealed room is provided around the prime mover shaft or a shaft that rotates at a rotation speed proportional to it, and the room is filled with fluid,
A blade is fixed to the shaft to rotate the fluid, and the pressure generated at the outer periphery of the chamber is extracted, the mocha is guided through a conduit to the pressure chamber of the diaphragm or plunger, and the resulting load is transferred to the governor of the prime mover. A fluid governor device for a prime mover, characterized in that, by balancing with a spring, a prime mover output control lever is pushed back to a no-load side when the prime mover exceeds a rated rotational speed.