JPH0380679B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is directed to an outboard boat which pumps up seawater by a pump in a propulsion device and supplies this seawater to an engine side through a passage in the propulsion device. This relates to the cooling system of the machine.

Prior Art Figure 4 shows the mounting structure of this type of outboard motor and the structure of the cooling water passage provided in the propulsion device. A drive shaft 5, a propeller shaft 6, etc. that transmit power to a propeller 4 are housed in the drive unit case 1, and a propulsion device 6 is constituted. Further, an engine mount 7 that becomes a part of the propulsion device 6 of this invention is attached to the upper part of the upper case 2, and on this engine mount 7,
An engine 9 covered by a cowling 8 is mounted. In this specification, these propulsion devices 6
The outboard motor body 1 is a combination of the engine 9 and the engine 9.
It is called 0. This outboard motor main body 10 is attached to a swivel bracket 1 via a vertical swivel pin 11.
2, and this swivel bracket 1
2 is pivotally supported by a horizontal and lateral tilt pin 13 to a clamp bracket 14 so as to be freely rotatable in the vertical direction, and this clamp bracket 14 is attached to the hull 1.
5 and supports the outboard motor main body 10. Therefore, the outboard motor main body 10 has a tilt pin 13
It is designed to tilt upward together with the swivel bracket 12 and to swing in the left-right direction about the swivel pin 11.

Inside the upper case 6 is a cooling water pump 16 that is attached to an intermediate portion of the drive shaft 5 and driven by the drive shaft 5. The seawater flows through the cooling water pipe 17 and the cavity 18.
An exit passage 20 passes through a vertically ascending passage consisting of , further bends rearward within the engine mount 7 , and then bends upward again from the longitudinal passage 19 .
The cooling water is then supplied to the cooling water intake port 21 of the engine 9. Conventionally, the longitudinal passage 19 in the engine mount 7 is
As shown in FIG. 3, the outlet passage 20 extends rearward while being inclined to one side of the left and right sides, and the outlet passage 20 thereof is arranged to be biased to one side of the left and right side of the engine mount 7.

Problems to be Solved by the Invention In the structure of the cooling water passage described above, when the engine 9 is stopped, that is, when the outboard motor main body 10 is tilted up with the cooling water pump 16 stopped, the cooling water inside the engine 9 is It is discharged from the intake port of the cooling water pump 16. Such discharge of cooling water occurs when the outboard motor main body 10 is tilted down.
When the engine is stopped, the gas is naturally discharged. That is, the outlet passage 20 opens at the lowest position of the cooling water jacket in the tilted down state. this is,
The same applies to the case where the outlet passage 20 is disposed biased to the left or right side as described above, and the outlet passage 20
By installing the cooling water in the lowest part of the engine's cooling water jacket, it is supposed to be discharged by gravity. However, even if the engine is stopped in such a tilted-down state, if the engine is tilted up before the coolant in the engine is completely drained, the part relatively lower than the outlet passage 20 This may cause the cooling water to remain. For example, in FIG. 3, when the outlet passage 20 is disposed biased to one of the left and right sides of the outboard motor main body, that is, to the left side, if the outlet passage 20 is swung about the swivel pin 13 in the direction of arrow A, which is the opposite direction. If the outboard motor main body 10 is to be tilted up in this state, the outboard motor main body 10 is
Centered around, the rear side is high as it is,
Tilts up so that the front side is lower. In this case, if the cooling water jacket 33 into which the outlet passage 20 opens is formed in the left-right direction of the outboard motor body, the cooling water jacket 33
Since the outlet passage 20 side is relatively on the rear side, the outlet passage 20 side is higher and the opposite side is lower. For this reason, the cooling water in the lower part remains on the outlet passage 20 side without being discharged. Therefore, in the winter, inconveniences such as freezing of the cooling water inside may occur.

The present invention eliminates such drawbacks and provides a cooling water passage structure that prevents cooling water from remaining even when the outboard motor body is tilted up while rocking in either direction. It is intended to.

Means for Solving the Problems In order to solve the above problems, in this invention,
An engine 9 is mounted on the top of the outboard propulsion device 6, and after rising inside the propulsion device 6 using a pump 16 disposed inside the propulsion device 6, it enters the engine 9 through a passage 19 in the longitudinal direction bent backwards. In a device having a cooling water passage for guiding cooling water, and in which the outlet of the longitudinal direction passage 19 toward the engine 9 side is arranged offset to one side of the left and right, the outlet of the longitudinal direction passage 19 is arranged in the left and right opposite direction. Another front-rear cooling water passage 3 having an outlet toward the engine at a position offset to
It is characterized by the formation of 1.

Function As described above, even when the outboard motor main body 10 is tilted up while rocking in the left and right direction,
Cooling water in the engine 9 can be discharged through either of the longitudinal passages 19 and 31.

Embodiment Hereinafter, the configuration of the present invention will be explained based on the illustrated embodiment. Like the conventional example shown in FIG. 4, the engine shown in FIG. In the mount 7, a longitudinal passage 19 communicating with the cavity 18 in the upper case 2 extends rearward while being inclined to one side, and the outlet passage 20 thereof is disposed at a position offset to the left. has been done. An auxiliary cooling water passage 31 is formed in symmetry with this longitudinal direction passage 19 and extends rearward while being inclined in the left-right opposite direction to the passage 19. The outlet passage 32 to the engine 9 side is formed so as to communicate with the cooling water intake port of the engine 9. The intake port 32 of this auxiliary cooling water passage 31 is communicated with the upper end of the cavity 18 in the upper case 2, like the conventional front-rear passage 19. In this case, cooling water is also supplied to the engine 9 side from the auxiliary cooling water passage 31, but most of the cooling water is supplied from the conventional longitudinal passage 19.

The above-mentioned front-rear passage 19 and auxiliary cooling water passage 31
1 and 2 show cases in which they extend rearward while being inclined in a straight line, but the same is true even if they are curved.

Effects of the Invention As described above, according to the present invention, in a device in which the outlet portion of the longitudinal passage is arranged offset to one side, a cooling water passage having an outlet portion toward the engine side is formed on the opposite side. Therefore, even if the outboard motor body is tilted up while rocking to the left or right, the cooling water in the engine is drained through either the cooling water passage or the longitudinal passage. can be discharged to the cooling water pump side,
Therefore, the inconvenience that occurs when cooling water remains in the engine and freezes is eliminated.

[Brief explanation of drawings]

Figure 1 is a bottom view of the engine mount that forms the cooling water passage viewed from the back, Figure 2 is a vertical cross-sectional view of the main part showing the auxiliary cooling water passage part of Figure 1, and Figure 3 is a bottom view of the engine mount forming the cooling water passage. FIG. 4 is a plan view of the outboard motor main body viewed from above, and a vertical sectional side view of the main parts of the entire outboard motor showing the structure of a conventional cooling water passage. 6... Propulsion device, 9... Engine, 19... Front-rear passage, 20... Exit passage, 31... Auxiliary cooling water passage, 32... Exit passage.

Claims (1)

[Claims] 1 The engine is mounted on the top of the propulsion device outside the vessel, and after rising inside the propulsion device from a pump installed inside the propulsion device, cooling water is guided into the engine through a passage in the front-rear direction that bends backwards. In a device having a passageway, and in which the outlet of the longitudinal passage toward the engine is located toward one side of the left and right, the outlet of the longitudinal passage toward the engine is located at a position offset to the left and right opposite to the exit of the longitudinal passage. 1. A cooling system for an outboard motor, characterized in that another cooling water passage in the front and back direction is formed having an outlet.