JPS58209693A - Pump driving system of outboard engine - Google Patents

Abstract

PURPOSE:To both reduce a mechanical loss at no use of a pump and compactly form an area around an outboard engine, by driving the pump with a cam shaft through a coupling device disengageable for the shaft end of the cam shaft of the outboard engine. CONSTITUTION:Rotation of a crankshaft 7 of an engine 1 in the upper part of an outboard engine is transmitted to a propeller by a driving shaft 16 while the outboard engine is steered by a steering handle 5. While a cam shaft driving pulley 9 is interlocked by a timing belt 8 for the shaft 7, and a pump 12 is disengageably coupled to the end part of a cam shaft 10 of the pulley 9 by a mechanical clutch device consisting of a driving side clutch 11A and a driven side clutch 11B. Then the clutch device is disengaged when the pump 12 is not used, and if the clutch device is engaged at use of the pump, the the pump 12 is driven by power of the engine 1, and seawater is sucked from a suction pipe 14A to flow in throug a delivery pipe 14B and supplied onto a ship body.

Description

[Detailed description of the invention] This relates to the external pump drive system.

Generally, ships equipped with outboard motors need to be equipped with seawater pumps for various tasks, but in many cases there is not enough space on board to install a pump, and the outboard motor There was a problem in that the cost increased due to the installation of a pump driven by a motor other than the above.

Therefore, the invention of Japanese Patent Publication No. 38-13265, which relates to a marine propulsion device that also serves as a pump, was made by focusing on the fact that it is rare to use an outboard motor propulsion device and a pump at the same time, and a pump for a marine propulsion device. Utility Model Publication No. 40-21853 concerning an outboard motor that can also be used as a pump
In addition, JP-A-56-1997 relates to a general-purpose pump in which a pump unit housing an impeller in the pump casing is attached to replace the propeller of an outboard motor, and the impeller is rotated by the propeller shaft. 146091
However, in any of the above cases, in order to operate it as a pump, it is necessary to remove and install it each time, and the operation is troublesome.

In addition, Japanese Utility Model Publication No. 47-35035 has been devised regarding a pump device for a propulsion machine that is capable of driving a pump installed in the propulsion machine frame using the prime mover for driving the propulsion machine. Since the pump is separately installed inside the cowling of the outboard motor, it takes up space inside the outboard motor to install the pump, and furthermore, it is inconvenient to handle.

Furthermore, if the pump driven by the outboard engine is not provided with a clutch, the pump will rotate even when the pump is not in use, resulting in large mechanical losses and poor durability.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and reduces mechanical loss by keeping the clutch of the pump driven by the engine of an outboard motor in an off state when the pump is not in use. Another object of the present invention is to provide a pump drive system for an outboard motor that allows pumping work even when the propeller is being propelled, and also allows for a more compact space around the outboard motor.

That is, in the outboard motor pump drive system of the present invention, the outboard motor pump is driven via a coupling device that can be fitted and removed from the shaft end of the camshaft of the outboard motor engine.
The camshaft drives the pump.

Embodiments to which the outboard motor pump drive system of the present invention is applied will be described below with reference to the drawings. In each of the following embodiments, the same parts are indicated by the same part numbers.

First, the outboard motor shown in Embodiment 1 of FIG. 1 consists of an engine 1 at the top and a lower unit 2 at the bottom, and the lower unit 2 is rotatable with respect to a swivel bracket 4 attached to the stern of the vessel It is attached to the engine 1 and is steered by the steering handle 5.
The pump 12 is fitted onto the shaft end of the camshaft 1o of the camshaft drive pulley 9, which is interlocked with the crankshaft 7 by a timing belt 8, by a mechanical clutch device consisting of a driving side clutch 11A and a passive side clutch IIB. They are removably connected.

Further, the propeller 15 provided in the lower unit 2 is
It is designed to be rotated by a crankshaft 7 via a drive shaft 16.

Further, this pump 12 is connected to a suction pipe 14A and a discharge pipe 14B provided along the outer surface of the cowling 16, and when the pump 12 is not in use, the clutch device can be turned off and released. When the pump 12 is in a neutral state, when it is used, if it is turned on, the pump 12 is driven by the power of the engine 1, and the discharge pipe 14 is turned on.
Seawater W can be supplied onto the hull through B.

In addition to the mechanical clutch device in the above embodiment, a hydraulic clutch, an electromagnetic clutch, or the like may be used as the coupling device for connecting the camshaft 10 and the pump 12 as described above.

Next, in the second embodiment shown in FIG. 2, a spline 17 is formed at the shaft end of the camshaft 10 in the outboard engine 1 having almost the same configuration as the first embodiment, and a cowling 16 is formed as an extension of the spline 17. A hole 18 is provided in the hole 18, and when the pump 12 is not used, the pump 12 is removed and the hole 18 is covered with a blind plate 19. When the pump 12 is used, the hole 18 is covered with a blind plate 19.
9, and connect the joint 2 to the spline 17.
A spline 21 formed at the shaft end of the pump shaft 12A of the pump 12 is connected through the spline 21, and the seawater W can be pumped up and supplied by the pump 12 driven by the power of the engine 1.

That is, in this case as well, the pump 1 driven by the camshaft 10
2 can be fitted onto and removed from the shaft end of the camshaft 10 by means of a coupling device consisting of splines 17, 21 and a joint 20.

Also, in Example 3 of FIG. 3, Example 1 of FIG.
The camshaft 10 and the pump 12 are connected to the camshaft drive pulley 9 in the outboard engine 1, which has almost the same configuration as the camshaft 10 and the pump 12, by a coupling device consisting of a pawl clutch 22 provided at the end of the pump shaft 12A of the pump 12. It is removable.

In this case, the pump shaft 12A has a mechanism that allows it to slide up and down while being positioned by a slide key 26 with respect to the impeller of the pump 12. As shown in FIG. 4, it can be rotated about a pin 24 and operated by a latch lever 25, and a positioning bolt 26 is used as a positioning device for clutch on/off of the clutch lever 25.
A detent ball 28 is provided which is pushed into the center hole of the clutch lever 24 via a spring 27.

Furthermore, the outer diameter A of the pawl clutch 22 and the inner diameter B of the concave portion of the clutch receiver 9 of the camshaft drive pulley 9 shown in the plan view of FIG. 5 and the side sectional view of FIG. In order to center the pump 12 and the camshaft 10, the pump mounting bolt hole 29 of the pump 12 body is made into a slightly larger hole.

In the third embodiment, the pawl clutch 22 and the clutch receiver are located at the portion 9.
A coupling device that allows the pump 12 and the camshaft 10 to be fitted and removed is integrated into the pump 12 and the camshaft drive pulley 9, making the entire outboard motor pump drive device lightweight. This makes it possible to reduce the size and size of the pump 12, reduce the cost, and improve the ease of handling the pump 12.

Therefore, in the outboard motor to which the pump drive system of the present invention is applied, there is no need to install a separate prime mover for the pump on the hull of the ship, and the pump driven by the engine of the outboard motor can be operated without the need for the pump. Since the coupling device is sometimes in a disconnected state, mechanical losses can be reduced and the durability of the pump can also be improved.

Furthermore, since there is no need to remove the pump from the outboard motor even when the pump is not in use, the pump is easier to handle, and furthermore, the pump can be operated even when the outboard motor is propelled by a propeller.

In particular, by applying the present invention, the drive device for a pump driven by an outboard motor can be made lighter and smaller, which is also effective in reducing costs.

Note that the present invention can be effectively applied to outboard motors in general.

[Brief explanation of drawings]

1 to 6 show the main parts of outboard motors in different embodiments to which the outboard motor pump drive system of the present invention is applied, and FIG. 1 shows the main parts of the first embodiment. 2 is a side sectional view of the main part of the second embodiment, FIG. 3 is a side sectional view of the main part of the third embodiment, and FIG. 4 is a side sectional view of the main part of the third embodiment.
5 is a plan view of the camshaft drive pulley of FIG. 3, and FIG. 6 is a side sectional view of FIG. 5. 1... Engine, 9... Camshaft drive boo! J, 9A...
・Clutch receiver is part, 10...camshaft, 11A...drive side clutch, 11B...passive side clutch, 12...
・Pump, 17...Spline, 20...Joint, 2
1... Spline, 22... Pawl clutch, 25...
・Clutch lever 1 agent Patent attorney Makoto Ogawa - Patent attorney Ken Noguchi Patent attorney Kazuhiko Saishita: 229 Figure 14B No. 32: 4;

Claims (1)

[Claims] A pump drive system for an outboard motor, characterized in that the pump is driven by a camshaft of an engine of the outboard motor via a coupling device that can be fitted and removed from the shaft end of the camshaft.