JP2003120334A - Water jet propulsion boat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a turning performance by moving throttle lever to an idle up direction when hold of the throttle lever is loosened during cruise and operation of steering handle exceeds normal operation steering angle. SOLUTION: When the steering handle 12 exceeds normal operation steering angles θ1, resistance is given on operation of the steering handle 12 by resistance giving members 40, 42, 44, 45 to make an operator recognize the normal operation steering angles θ1 by operating feeling with increased operation resistance and a throttle cable 35 is moved to the idle up direction a little by idle up members 46, 49, 55.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a water jet propulsion watercraft.

[0002]

2. Description of the Related Art A water jet propulsion boat propels by ejecting a jet flow generated by an impeller of a jet propulsion machine driven by an engine, backward from an injection nozzle.

When the throttle lever of the steering wheel is gripped and loosened, the throttle valve rotates and the engine speed changes up and down. When the throttle lever is released, the throttle valve rotates in the closing direction. The engine speed will drop to the idling speed.

[0004]

In the water jet propulsion watercraft as described above, when the throttle lever is released during traveling, the engine speed drops to the idling speed within a few seconds. There is a demand to move the throttle cable in the idle-up direction so that the turning performance can be maintained only when the operation of exceeds the normal operation steering angle.

The present invention has been made in order to meet the above-mentioned demand, and when the throttle lever is released during traveling,
An object of the present invention is to provide a water jet propulsion boat in which the throttle cable can be moved in the idle-up direction only when the operation of the steering wheel exceeds the normal steering angle.

[0006]

In order to solve the above problems, the present invention provides a water jet propulsion system in which a jet flow generated by an impeller of a jet propulsion machine driven by an engine is ejected backward from an injection nozzle. The boat is provided with a resistance applying member that gives resistance to the operation of the steering wheel when the steering wheel exceeds the normal operation steering angle, and an idle up member that moves the throttle cable in the idle up direction. The feature is to provide a water jet propulsion boat.

According to the present invention, when the steering wheel exceeds the normal steering angle, the resistance imparting member imparts resistance to the operation of the steering wheel, so that the operator feels the operation feeling due to the increase in the operating resistance. The normal operating rudder angle can be known from the above, and when the steering wheel exceeds the normal operating rudder angle, the throttle cable is slightly moved in the idle up direction by the idle up member, so that the engine speed exceeds the idling speed. Since it goes up, the thrust of the engine during that time improves the steering effect and the turning performance can be maintained. Further, if the steering wheel has a normal steering angle, no resistance is given to the operation of the steering wheel and the idle-up is not performed, so that the driver does not feel uncomfortable.

According to a second aspect of the present invention, in the first aspect, a speed-sensitive idle-up adjusting member for adjusting the throttle cable to move in a higher idle-up direction as the boat speed becomes faster is provided. The faster the speed, the better the steering effect and the better the turning performance.

According to a third aspect of the present invention, in the first or second aspect, the intermediate portion is rotatably supported by the handle post of the steering handle, and the tip portion is separated from the normal operation steering angle of the steering handle. A pair of left and right arm members urged by springs to be attracted to each other in a separated state are provided, and the tip of the arm member is attached to a swing member that swings left and right in conjunction with the handle shaft of the steering handle. An abutment pin that is located between the arm members and that can push and rotate the arm member against the spring force, is disposed between the rear ends of the arm members, and the piston rod is A rudder angle cylinder connected to the rear end of the arm body and a cylinder body connected to the rear end of the other arm member is provided, and a throttle rotation lever connected to the throttle cable is provided. When the steering wheel exceeds the normal steering angle, the spring of the arm member gives resistance to the operation of the steering wheel, and the operation of the steering angle cylinder rotates the throttle rotation lever to rotate the throttle cable. Is configured to move in an idle-up direction, the arm member as a resistance applying member, a spring, a rotating pin, and the like, and a steering angle cylinder and a throttle rotating lever as an idle-up member are mechanically operated. The structure is simple and the control is easy. A diaphragm having the same function as the cylinder can be used instead of the cylinder.

According to a fourth aspect of the present invention, in the third aspect, when the throttle cylinder for rotating the throttle rotation lever in the idle up direction by the fluid pressure of the steering angle cylinder is provided, the idle up member is provided. Since the throttle cylinder as described above can be mechanically constructed, the structure is simple and the control can be easily performed. A diaphragm having the same function as the cylinder can be used instead of the cylinder.

According to a fifth aspect of the present invention, in the third or fourth aspect, the throttle cable is a flexible cable including an inner cable and an outer cable, and one end of the inner cable is connected to a throttle valve opening / closing operation pulley. , The other end is connected to the throttle lever of the steering handle, one end of the outer cable is connected to the throttle turning lever, the other end is connected to the steering handle, and the outer end is connected to the throttle turning lever. If the inner cable is used to move the throttle valve opening / closing operation pulley in the idle-up direction when the cable is moved, the throttle cable as an idle-up member can be mechanically configured, so the structure is simple and controllable. Will also be easier to do.

According to a sixth aspect of the present invention, in the third to fifth aspects, an idle-up adjusting cylinder is provided which moves the pivot fulcrum of the throttle pivot lever in a higher idle-up direction as the boat speed increases. Since the idle-up adjusting cylinder as the idle-up member can be mechanically constructed, the structure is simple and the control can be easily performed. A diaphragm having the same function as the cylinder can be used instead of the cylinder.

According to a seventh aspect of the present invention, in the sixth aspect, the boat speed is detected by the Pitot tube, and when the idle up adjusting cylinder is operated by the water pressure of the Pitot tube, the Pitot tube as an idle up adjusting member is actuated. Since it can be mechanically configured, it has a simple structure and can be easily controlled. If a ship speed detection sensor is used instead of the Pitot tube, a solenoid can be used instead of the idle-up adjustment cylinder.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, a water jet propulsion boat 1
The hull member 2 and the deck member 3 are joined together at their peripheral portions to form a hull 4, and an engine 6 is provided in an engine room 5 formed in the hull 4 at a substantially central position in the front-rear direction. A fuel tank 7 is installed in front of the engine 6, and a jet propulsion machine 10 is installed in a pump room 9 that is partitioned by a bulkhead 8 behind the engine room 5.

A steering handle 12 is provided in the front upper part of the deck member 3, and a seat base 13 is provided in the rear upper part of the deck member 3, and a seating type seat in the front-rear direction is provided on the seat base 13. 14 is detachably attached. Note that 15a and 15b are ventilation ducts that connect the engine room 5 to the atmosphere.

Crankshaft (output shaft) 1 of the engine 6
An impeller shaft 18 is connected to 6 via a coupling 17, and the impeller shaft 18 is connected to the jet propulsion machine 1 described above.
No. 0 impeller housing 10a accommodates an impeller (not shown).
An injection nozzle 19a is provided at the rear end portion of a, and a deflector 19b is attached to the injection nozzle 19a.

The jet flow generated by the impeller of the jet propulsion machine 10 driven by the engine 6 is injected into the injection nozzle 19
By injecting backward from a, the hull 4 is propelled, and the operator straddling the straddle-type seat 14 operates the steering handle 12 to swing the deflector 19b of the injection nozzle 19a left and right. It will be turned.

The engine 6 is installed on the hull member 2 so that the crankshaft 16 extends in the front-back direction of the hull 4,
An intake pipe 21 for each cylinder connected to an intake port of a cylinder head and an intake chamber 22 connected to an upstream end of the intake pipe 21 are provided on the port side of the engine 6, and the front of the engine 6 is provided. An intake silencer 23 is provided in the intake air silencer 23, and the intake silencer 23 and the intake chamber 22 are connected via an intake duct 24.

An exhaust pipe 25 connected to the exhaust port of the cylinder head is provided on the starboard side of the engine 6, and the exhaust pipe 25 penetrates the bulkhead 8 while extending to the rear of the engine 6. Connected to the water lock 26 in the pump room 9,
The discharge pipe 26a of 6 is connected to the outside of the boat.

A control box 28 is installed above the bulkhead 8 on the engine room 5 side.

As shown in FIGS. 2 and 3, the handle shaft 30 of the steering handle 12 has the upper flange portion 3
It is rotatably supported by a handle post 31 fixed to the hull 4 at 1a.

A throttle lever 34 is attached to a bracket 33 near the handgrip 32 on the right side of the steering handle 12 by a rotating pin 34a, and an inner end of a flexible throttle cable 35 whose one end is connected to the throttle lever 34. The other end of the cable 35a is
It is wound around a pulley 38 of a valve shaft 37 of a throttle valve 36 provided in each intake passage 6a of each cylinder of the engine 6. Further, one end of the outer cable 35b of the throttle cable 35 is attached to the throttle lever 34 and fixed to the bracket 33, and the other end thereof is a rotary lever 49 for a throttle described later.
It is fixed to the middle part of.

When the operator grips the throttle lever 34 (see arrow a), the inner cable 35a is pulled and the pulley 38 rotates left (see arrow c), and the throttle valve 36 rotates in the opening direction. Then, when the engine speed increases and the operator loosens the throttle lever 34 (see arrow b), the pulley 37 rotates right (see arrow d) by the urging force of the return spring (not shown), and the inner cable 35a Is pulled, the throttle valve 36 rotates in the valve closing direction, and the engine speed decreases. When the operator releases the throttle lever 33, the throttle valve 36
Is closed and the engine speed drops to the idling speed.

On the handle shaft 30 of the steering handle 12, a swing member 40 that swings left and right in conjunction with the handle shaft 30 is fixed, and a steering cable 41 having one end connected to the tip of the swing member 40. The other end is connected to the deflector 19b of the jet nozzle 19a. An abutment pin 42 is fixed to the upper surface of the swing member 40 on the distal end side.

When the operator operates the steering handle 12 in the right direction, the steering cable 41 is pulled through the swinging member 40 so that the deflector 19b is pinned by the pin 19.
While swinging to the left around c, the hull 4 is turned to the right,
When the operator operates the steering handle 12 to the left, the steering cable 41 is pushed through the swinging member 40, and the deflector 19b swings right about the pin 19c.
The hull 4 will be turned to the left.

Lower flange portion 3 of the handle post 31
1b is provided with a pair of left and right arm members 44L and 44R each having an intermediate portion rotatably supported by a pin 43, and both end portions of a coil spring 45 are respectively provided at the tip ends of the arm members 44L and 44R. It is locked, and the tip ends of the arm members 44L and 44R are urged by a spring force so as to attract each other.

The arm members 44L and 44R are lowered so as to separate the normal steering angle .theta.1 of the steering handle 12 while the tip ends of the arm members 44L and 44R are urged by the coil spring 45 so as to attract each other. Flange part 31
The stopper portions 31c of b are abutted against each other and isolated.

The normal operating steering angle of the steering handle 12 is that the abutment pin 42 of the swinging member 40 corresponds to each arm member 44.
Rudder angle θ until contact with either of L and 44R tips
At this steering angle θ1, the steering handle 12 can be lightly operated in the left-right direction to turn, and when the normal operation steering angle is exceeded, the contact pin 42 of the swinging member 40 means that the abutting pin 42 of each arm member 44L. , 44R, and the arm member 44L (or 44R) that abuts against one of the tip portions of the coil spring 45 is rotated against the spring force of the coil spring 45. Steering wheel 12
With a little force, you can operate by turning left and right.

A steering angle hydraulic cylinder 46 is disposed between the rear ends of the arm members 44L and 44R, and a piston rod 46a of the steering angle hydraulic cylinder 46 is connected to the rear end portion of the left arm member 44L. In addition, the cylinder body 46b is connected to the rear end of the right arm member 44R.

On the other hand, the other end of the outer cable 35b close to the pulley 38 of the throttle cable 35 is fixed to the intermediate part of the throttle turning lever 49, and one end of this turning lever 49 has an idle-up adjusting hydraulic pressure. It is connected to a piston rod 50a of the cylinder 50 by a pin 50c. This throttle turning lever 49 is provided with a pin 5
It becomes possible to rotate about 0c as a fulcrum. Further, a return spring 5 for urging the throttle rotation lever 40 to the right rotation position is provided at the other end of the throttle rotation lever 40.
4 is attached.

The idle up adjusting hydraulic cylinder 5
The pipe 52 of the pitot tube 51 provided at the stern of the hull 4 is connected to the right chamber 50d of the cylinder body 50b of 0, and the return spring 53 of the piston rod 50a is compressed in the left chamber 50e. There is.

A piston rod 5 of a hydraulic cylinder 55 for throttle is provided at the tip end side of the rotary lever 49 for throttle.
5a are connected via a link 57, and the right chamber 55c of the cylinder body 55b and the steering angle hydraulic cylinder 4 are connected.
The right chamber 46c of the cylinder body 46b of No. 6 is connected by a pipe 56.

Water jet propulsion boat 1 constructed as described above
At the time, while the water jet propulsion boat 1 is in motion, the rocking member 4
At the normal operation steering angle θ1 until the contact pin 42 of 0 comes into contact with either of the tip ends of the arm members 44L and 44R, the operator can lightly operate the steering handle 12 to turn. In addition, whether the normal operation steering angle θ1 is
The abutment pin 42 of the swinging member 40 is attached to each arm member 44L, 4L.
When it comes into contact with any one of the front end portions of 4R, the operation resistance due to the spring force of the coil spring 45 increases in the subsequent operation of the steering handle 12, and this can be understood from the operation feeling. If the steering wheel 12 has a normal operation steering angle θ1, the resistance of the coil spring 45 is not given to the operation of the steering wheel 12 and the idle-up as described later does not occur, so that the driver does not feel uncomfortable. .

While the water jet propulsion boat 1 is running,
When the throttle lever 34 is released for berthing or the like, the engine speed drops to the idling speed within a few seconds.

Therefore, even when the throttle lever 34 is released, as shown in FIG.
The steering wheel 12 has a steering angle θ that exceeds the normal steering angle θ1.
When operated in the left turning direction with 2, the contact pin 42 of the swinging member 40 contacts the tip of the left arm member 44L, and the left arm member 44L is rotated counterclockwise against the spring force of the coil spring 45. With this steering angle θ2, the steering handle 12 is operated in the left direction with some force in order to resist the spring force.

When the left arm member 44L is rotated to the left, the piston rod 46a of the steering angle hydraulic cylinder 46 is moved to the right (see arrow e), and the hydraulic pressure in the right chamber 46c is changed to the pipe 56.
By being supplied to the right chamber 55c of the throttle hydraulic cylinder 55 via the piston rod 55a, the piston rod 55a is moved left (see arrow f), and the throttle rotation lever 49 is rotated left (see arrow g). Like

By turning the throttle turning lever 49 to the left, the outer cable 35b of the throttle cable 35 is rotated.
The inner cable 35a is pulled together with the rear end of the pulley 38, and the pulley 38 is rotated leftward (see arrow c).
Rotates in the valve opening direction, and the engine speed starts to idle up.

Similarly, as shown in FIG. 5, when the steering handle 12 is operated in the right turning direction at a steering angle θ2 that exceeds the normal operation steering angle θ1, the contact pin 42 of the rocking member 40 causes the contact pin 42 to move to the right arm member. The right arm member 44R by abutting on the front end portion of 44R
Is rotated to the right against the spring force of the coil spring 45. At this steering angle θ2, the steering wheel 1
In order to resist 2 the spring force, it will be operated to the right with some force.

When the right arm member 44R is rotated to the right, the cylinder body 46b of the steering angle hydraulic cylinder 46 moves to the left (see arrow e '), and the hydraulic pressure in the right chamber 46c is changed to the pipe 56.
By being supplied to the right chamber 55c of the throttle hydraulic cylinder 55 via the piston rod 55a, the piston rod 55a is moved left (see arrow f), and the throttle rotation lever 49 is rotated left (see arrow g). Like

By rotating the throttle rotation lever 49 to the left, the outer cable 35b of the throttle cable 35 is rotated.
The inner cable 35a is pulled together with the rear end of the pulley 38, and the pulley 38 is rotated leftward (see arrow c).
Rotates in the valve opening direction, and the engine speed starts to idle up.

That is, the operator operates the throttle lever 34.
Even if the steering wheel 12 is released, if the steering wheel 12 is operated in the left or right turning direction at a steering angle θ2 that exceeds the normal operation steering angle θ1, the engine speed will rise above the idling speed and the engine 6 Since the turning performance can be maintained by thrust, it becomes easier to berth.

On the other hand, when the steering wheel 12 is operated in the left or right turning direction with the steering angle θ2 exceeding the normal operation steering angle θ1, when the boat speed is high, as shown in FIG.
When the water pressure corresponding to the boat speed acts on the right chamber 50d of the idle-up adjusting hydraulic cylinder 50 from the pitot pipe 51 through the pipe 52, the piston rod 50a resists the spring force of the spring 53 according to the water pressure to the left. When the pin (rotation fulcrum) 50c of the throttle rotation lever 49 is moved to the left by a distance h from its original position, the inner cable 35a is further moved together with the rear end of the outer cable 35b of the throttle cable 35. Pulled Pulley 3
8 is further rotated leftward in the idle-up direction by an angle θ3 (see arrow c).

As a result, the engine speed further increases, the thrust of the engine 6 increases, and the turning performance can be maintained better, so that berthing and the like can be performed more easily. That is, as the speed-sensitive type, the steering efficiency is improved as the boat speed is higher.

In the above embodiment, even if the steering handle 12 is operated in either the left or right turning direction at a steering angle θ2 that exceeds the normal operation steering angle θ1 while the boat is running while holding the throttle lever 34, the throttle cable Since the inner cable 35a of 35 only moves inside the outer cable 35b, it does not affect the operation of the throttle lever 34 at all.

[0046]

As is apparent from the above description, the present invention is effective when the steering wheel exceeds the normal operation steering angle.
By adding resistance to the operation of the steering wheel with the resistance applying member, the operator can know the normal operation steering angle from the operation feeling due to the increase in the operation resistance, and when the steering wheel exceeds the normal operation steering angle. In addition, by slightly moving the throttle cable in the idle-up direction with the idle-up member, the engine speed becomes higher than the idling speed, so that the thrust of the engine during that time improves the steering efficiency and the turning performance can be maintained. . Further, if the steering wheel has a normal steering angle, no resistance is given to the operation of the steering wheel and the idle-up is not performed, so that the driver does not feel uncomfortable.

When the speed-sensitive idle-up adjusting member is adjusted so that the throttle cable is moved in the higher idle-up direction as the boat speed becomes faster, the steering effect becomes better as the boat speed becomes faster. Therefore, the turning performance can be better maintained.

By mechanically constructing the arm member as the resistance applying member, the spring, the rotating pin, the steering angle cylinder as the idle-up member, the throttle rotating lever, and the like as in claim 3, The structure is simple and the control is easy.

When a throttle cylinder for rotating the throttle rotation lever in the idle-up direction by the fluid pressure of the steering angle cylinder is provided as in the fourth aspect, the throttle cylinder as the idle-up member is mechanically operated. Since it can be configured, it has a simple structure and can be easily controlled.

As described in claim 5, when the outer cable of the flexible throttle cable is moved by the lever for rotating the throttle, the inner cable is used to move the throttle valve opening / closing operation pulley in the idle up direction. Since the throttle cable as a member can be mechanically constructed, it has a simple structure and can be easily controlled.

According to the sixth aspect of the present invention, in the idle-up adjustment cylinder, when the rotation fulcrum of the throttle rotation lever is moved in the higher idle-up direction as the boat speed becomes faster, the idle-up adjustment for the idle-up member is performed. Since the cylinder can be mechanically constructed, the structure is simple and the control is easy.

When the ship speed is detected by the Pitot tube and the idle up adjusting cylinder is operated by the water pressure of the Pitot tube, the Pitot tube as an idle up adjusting member can be mechanically constructed. The structure is simple and the control can be performed easily.

[Brief description of drawings]

FIG. 1 is a fragmentary side view of a water jet propulsion watercraft according to the present invention.

FIG. 2 is a system perspective view of a steering handle.

FIG. 3 is a plan view showing a relationship between an arm member and a throttle cable.

FIG. 4 is a plan view showing a relationship between an arm member and a throttle cable when a steering handle is turned left.

FIG. 5 is a plan view showing a relationship between an arm member and a throttle lever when a steering handle is turned right.

FIG. 6 is a plan view showing the relationship between the arm member and the throttle lever when the steering handle is turned left when the boat speed is fast.

[Explanation of symbols]

1 Water Jet Propulsion Boat 6 Engine 10 Jet Propulsion Machine 12 Steering Handle 19a Injection Nozzle 30 Handle Shaft 31 Handle Post 34 Throttle Lever 35 Throttle Cable 35a Inner Cable 35b Outer Cable 39 Throttle Valve Open / Close Pulley 40 Swing Member (Resisting Member ) 42 contact pin (resistance applying member) 44 (L, R) arm member (resistance applying member) 45 coil spring (resistance applying member) 46 hydraulic cylinder for steering angle (idle up member) 46a piston rod 46b cylinder body 49 throttle Rotating lever (idle up member) 50 Hydraulic cylinder for idle up adjustment (idle up adjustment member) 51 Pitot tube (idle up adjustment member) 55 Hydraulic cylinder for throttle (idle up member) θ 1, θ2 rudder angle

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B63H 21/21 B63H 21/21 25/46 25/46 F02D 11/06 F02D 11/06 C 29/02 29 / 02 C

Claims (7)

[Claims] 1. A water jet propulsion watercraft that propels a jet flow generated by an impeller of a jet propulsion machine driven by an engine by injecting backward from an injection nozzle, when a steering handle exceeds a normal operation steering angle. A water jet propulsion boat, comprising: a resistance applying member that applies resistance to the operation of the steering wheel; and an idle up member that moves the throttle cable in an idle up direction. 2. The water jet propulsion boat according to claim 1, further comprising an idle-up adjusting member for adjusting the throttle cable to move in a higher idle-up direction as the boat speed increases. 3. An intermediate portion is rotatably supported by a handle post of the steering handle, and a tip end portion is separated so as to separate a normal operation steering angle of the steering handle so as to be attracted to each other by a spring. A pair of left and right arm members that are urged to the arm is provided, and the swing member swings left and right in conjunction with the handle shaft of the steering handle. An abutment pin that can be pushed and rotated against a force is provided, is arranged between the rear ends of the arm members, the piston rod is connected to the rear end of one arm member, and the cylinder body is A steering angle cylinder connected to the rear end of the arm member is provided, a throttle rotation lever connected to the throttle cable is provided, and the steering handle exceeds the normal operation steering angle. First, the spring of the arm member gives resistance to the operation of the steering wheel, and the throttle lever is rotated by the operation of the steering angle cylinder to move the throttle cable in the idle-up direction. Item 1. A water jet propulsion boat according to Item 1 or 2. 4. A water jet propulsion boat according to claim 3, further comprising a throttle cylinder for rotating the throttle rotation lever in an idle-up direction by the fluid pressure of the steering angle cylinder. 5. The throttle cable is a flexible cable including an inner cable and an outer cable, one end of the inner cable is connected to a throttle valve opening / closing operation pulley, and the other end is connected to a throttle lever of the steering handle. In addition to being connected, one end of the outer cable is connected to the throttle rotation lever and the other end is connected to the steering handle, and when the outer cable is moved by the throttle rotation lever, the inner cable throttles. The water jet propulsion boat according to claim 3 or 4, wherein the valve opening / closing operation pulley is moved in an idle-up direction. 6. The water according to claim 3, further comprising an idle-up adjusting cylinder for moving the rotation fulcrum of the throttle rotation lever in a higher idle-up direction as the ship speed increases. Jet propulsion boat. 7. The water jet propulsion boat according to claim 6, wherein the boat speed is detected by a pitot tube, and the idle up adjustment cylinder is operated by the water pressure of the pitot tube.