JP3464281B2 - Outboard motor case structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a case of an outboard motor which supports a propeller and can be positioned underwater together with the propeller.

[0002]

2. Description of the Related Art Some outboard motors are conventionally constructed as described above.

That is, a case is provided which is attached to the hull side and at least the lower part of which can be submerged. A propeller is supported on the lower part of the case, and the propeller is driven by an engine. A forward / reverse rotation switching mechanism for the propeller is provided in the same case, while a forward / reverse operation unit is provided above the same case. Further, the case is composed of a case body, an opening formed in an upper portion of the case body to open the inside of the case body upward, and a lid body that closes the opening openably and closably, and a through hole formed in the lid body. There is provided a shift rod that connects the switching mechanism and the operation unit through the.

Normally, the propeller is normally rotated and the hull is moved forward. However, if the operating portion is operated in the reverse direction, the switching mechanism is interlocked with this by operating the shift rod, The propellers are reversed so that the hull can be moved backwards.

[0005]

According to the above-mentioned conventional structure, the lid is fastened to the case body by a fastener provided separately, which increases the number of parts of the case and The configuration is complicated.

In addition, when the lid is attached to the case main body in the case of assembling the case, if the lid is mispositioned, the through hole formed in the lid and the shift rod to be inserted into the through hole are formed. May not positionally match each other, that is, the shift rod cannot be inserted into the through hole.

Therefore, when the lid is attached, accurate positioning is required, which makes the attachment of the lid complicated, that is, the case assembling work is complicated. .

Further, since the lid body is sometimes made of resin and has a low strength itself, when the lid body is attached to the ceiling portion of the case main body, the attachment strength is low. It may not be possible to secure it sufficiently.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to simplify the structure of a case constituting an outboard motor and to facilitate its assembling work. To aim.

It is another object of the present invention to improve the attachment strength of the lid to the upper part of the case body with a simple structure.

[0011]

[Means for Solving the Problems] The present invention for achieving the above object is as follows.

Incidentally, this "means for solving the problem"
In the section, the terms in parentheses below correspond to the terms in the claims.

In the case structure of the outboard motor of the present invention, the lower case (case) 22 is a case body 46, an opening 48 formed in an upper portion of the case body 46 and opening the inside of the case body 46 upward, and the opening 48. Is provided with a lid 51 that can be opened and closed, and a shift rod 55 that connects the switching mechanism 38 and the operating portion 42 is provided through a through hole 52 formed in the lid 51. The shift rod 55 is provided on the upper surface side of the case body 46. In the outboard motor 6 in which the water pump 58 driven by the engine 16 is detachable, the pump casing 60 of the water pump 58 attached to the case body 46
The lid 51 is pressed against the case body 46 side, and a protrusion (engagement portion) 69 is formed on the lid 51, while the protrusion (engagement portion) 69 is detachably engaged. The notch (engaged portion) 67 to be fitted is provided in the pump casing 60.
It was formed in.

In the above case, a notch 67 is formed in a part of the pump casing 60 of the water pump 58, and the notch 67 and the middle portion of the shift rod 55 in the longitudinal direction are fitted and removed in the radial direction of the shift rod 55. The lid 51 may be freely fitted and the both side edges 66a, 66a of the notch 67 may press the lid 51 to the case body 46 side.

[0015]

[Operation] The operation of the above configuration is as follows.

In the "action" section, the terms in parentheses below correspond to the terms in the claims.

Case body 4 of the lower case (case) 22
When attaching the lid 51 to the case 6, the lid 51 is placed at a predetermined position on the case body 46, and then the water pump 58 is attached to the case body 46.

Then, the lid 51 is attached to the case body 4
Pump casing 6 of the water pump 58 mounted on the 6
By 0, it is pressed against the case body 46 side and attached to the case body 46.

When attaching the lid 51 and the water pump 58 to the upper portion of the case body 46, first,
The above attachment is performed while engaging the protrusion (engaging portion) 69 of the lid 51 and the notch (engaged portion) 67 of the pump casing 60 of the water pump 58. Then, by the engagement, the lid 51 is automatically and accurately positioned with respect to the predetermined position of the case body 46.

In the above case, the notch 67 is formed in a part of the pump casing 60 of the water pump 58, and the notch 67 and the midway portion of the shift rod 55 in the longitudinal direction are fitted in the radial direction of the shift rod 55. The lid 51 may be detachably fitted and the lid 51 may be pressed against the case body 46 by the side edges 66a, 66a of the notch 67.

In this way, the lid 51 is the water pump 5.
A part of the pump casing 60 of No. 8 is pressed against the case main body 46 side as a whole. Moreover, the pump casing 60 itself has sufficient strength and rigidity to withstand the internal pressure thereof.

Therefore, the lid 51 is made of resin,
Even though the strength of itself is low, the lid 51 is attached to the case body 46 side with sufficient attachment strength.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 1 is a ship floated on the water surface 2, and arrow Fr indicates the front of the ship 1.

An outboard motor 6 is detachably attached to the stern plate 4 of the hull 3 of the ship 1. This outboard motor 6
Has a pair of left and right clamp brackets 7, 7 which are detachably attached to the upper edge of the stern plate 4, and a swivel bracket 9 is vertically rotatable via a first pivot shaft 8 on the both clamp brackets 7, 7. Is pivoted to. Further, a fixing tool (not shown) for arbitrarily fixing the swivel bracket 9 at desired vertical positions is provided.

A steering shaft 11 having a longitudinal axis is rotatably supported around the axial center of the rear pivotal end of the swivel bracket 9 on the hull 3 side. A steering bracket 12 is fixed to the upper end of the steering shaft 11, and a lower bracket 13 is fixed to the lower end thereof. It is supposed to be rotatable around.

A propulsion unit 14 is detachably attached to each rear pivoting end of the steering bracket 12 and the lower bracket 13 by a bolt (not shown). The propulsion unit 14 includes a cylindrical casing 1 with an axial center oriented vertically.
5, an engine 16 as a drive source is attached to the upper end of the casing 15, and the engine 16 is covered with a cowling 18. On the other hand, the casing 17
A propeller 19 is provided so as to project rearward from the lower end of the propeller 19, and the propeller 19 is driven by the engine 16. Two
Reference numeral 0 denotes a steering handle, and the steering handle 20 is attached to the steering bracket 12.

In all the drawings, the casing 15 is composed of an upper case 21 which is detachably fixed to each other and a lower case 22 which is a case.
2 is a propulsion unit 14 centered on the first pivot 8
With the downward rotation of the water surface 2, the water surface 2 is positioned downward from above, that is, at least the lower portion thereof can be submerged.

A propeller shaft 25 is supported on the lower portion of the lower case 22 by a pair of front and rear bearings 24, 24. This propeller shaft 25 extends in the front-rear direction, and its axial center 2
It is supported so that it can rotate around 6. Propeller shaft 2 above
The rear end of the propeller 5 protrudes rearward from the inside of the lower case 22, and the propeller 19 is attached to the rear end of the propeller shaft 25.

A power transmission device 28 for transmitting the power of the engine 16 to the propeller shaft 25 is provided. The power transmission device 28 has a power transmission shaft 29 which is housed in the casing 15 with its shaft center oriented vertically. The power transmission shaft 29 is rotatably supported by the pair of upper and lower bearings 30, 30 about the shaft center of the casing 15, and the upper end thereof is interlocked with the crankshaft side of the engine 16.

The power transmission device 28 also includes a gear device 31 for connecting the front end of the propeller shaft 25 to the lower end of the power transmission shaft 29. The gear device 31 includes a drive gear 33, which is a bevel gear attached to the lower end of the power transmission shaft 29, and a driven gear, which is a bevel gear that is rotatably supported by the front end of the propeller shaft 25 and meshes with the drive gear 33. 34, the same as above, an engagement element 35 that is fitted onto the propeller shaft 25 and rotates together with the propeller shaft 25, and is slidable only in the axial direction of the propeller shaft 25; The elastic body 36 is a coil spring that urges it to slide toward 34.

The engagement element 35 is slidable on the propeller shaft 25 so that the engagement element 35 can be engaged with and disengaged from the driven gear 34 in a dog latch manner, and the elastic element 36 biases the engagement element 35. Is engageable with the driven gear 34. When the engagement element 35 is engaged with the driven gear 34, the driven gear 34 rotates together with the propeller shaft 25 via the engagement element 35.

When the engine 16 is driven and its power is transmitted to the power transmission shaft 29, the power transmission shaft 2
9 rotates in the direction of arrow A in FIG. Then, the power of the power transmission shaft 29 is transmitted to the propeller shaft 25 via the drive gear 33, the driven gear 34, and the engagement element 35, and the propeller 19 together with the propeller shaft 25 is indicated by an arrow R in FIGS. Rotate in the direction (hereinafter referred to as "normal rotation").

The propeller 19 is provided in the lower case 22.
A switching mechanism 38 for forward and reverse rotation is provided. The switching mechanism 38 has a reversing gear 39, which is a bevel gear, which is supported in a midway portion of the propeller shaft 25 in the longitudinal direction in a free-wheeling manner and meshes with the drive gear 33.

A part of the switching mechanism 38 is composed of the engaging element 35. This engaging element 35
When the propeller shaft 25 is slid against the urging force of the elastic body 36, the engagement element 35 can be engaged with and disengaged from the reverse rotation gear 39 in a dog latch type. in this case,
The engagement element 35 is engageable with only one of the driven gear 34 and the reverse rotation gear 39. When the engagement element 35 engages with the reverse rotation gear 39, the engagement element 3 is engaged.
The reverse rotation gear 39 rotates together with the propeller shaft 25 via 5.

The driven gear 34 and the reversing gear 39 mesh with the drive gear 33 from the front and the rear thereof, and rotate in opposite directions about the axis 26 of the propeller shaft 25. Therefore, when the engagement element 35 is engaged with the reverse rotation gear 39, the propeller shaft 25 rotating together with the reverse rotation gear 39 causes the propeller 19 to rotate in the direction opposite to the arrow R in FIGS. 1 and 2. (Hereinafter, this is called "reversal").

A forward / reverse operating device 41 for selectively engaging the engagement element 35 with either the driven gear 34 or the reverse rotation gear 39 is provided. This forward / reverse operating device 4
1 is provided with a forward / reverse operation section 42 provided above the lower case 22 and manually operated. On the other hand, at the front end portion of the propeller shaft 25, the sliding hole 4 is formed on the shaft center 26 thereof.
3 is formed, and the operation shaft 44 is fitted in the sliding hole 43 so as to be slidable in the axial direction. The rear end of the operating shaft 44 is connected to the engaging element 35, and the front end of the operating shaft 44 slightly projects forward from the front end of the propeller shaft 25. The elastic body 36 is housed on the bottom side of the sliding hole 43.

The lower case 22 has a case body 46. A space 4 which is circular in a plan view in the case body 46
7 is formed, and an opening 48 that opens this space 47 upward is formed in the upper part of the case body 46. The opening 4
8 has a circular shape in a plan view, and is formed to have a larger diameter dimension than the space 47, and a step surface 49 is formed between the space 47 and the opening 48.

A lid 51 made of resin and having a circular shape in plan view is provided to open and close the opening 48. This lid 51
Is removably fitted into the opening 48 to close the opening 48. In addition, the lid 51 fitted into the opening 48.
Is supported on the step surface 49, and in this case, the lid 5
The upper surface of 1 is substantially flush with the upper surface of the case body 46. Further, a through hole 52 whose axial center is oriented vertically is formed in the lid 51, and the through hole 52 is deviated slightly forward from the axial center 53 of the lid 51.

The space 47 accommodates a shift rod 55 having an axis 54 oriented vertically. This shift rod 5
The upper end side of 5 penetrates the through hole 52 upward and is connected to the operation portion 42. On the other hand, a cam 56 is attached to the lower end of the shift rod 55.

When the shift rod 55 is rotated around its axis 54 by operating the operation portion 42, the cam 56 interlocked with the shift rod 55 can be cam-engaged with the front end of the operation shaft 44. ing.

When the operating portion 42 is operated to move forward, the cam engagement of the cam 56 with respect to the operating shaft 44 is released, and the urging force of the elastic body 36 causes the engagement element 35 to engage with the driven gear 34. Then, the propeller 19 is "normal"
Then, the ship 1 is advanced.

On the other hand, if the operating section 42 is operated backward,
A cam 56, which is interlocked with this via a shift rod 55, engages with the operating shaft 44 by a cam, and the operating shaft 44 is moved by the elastic member 36.
To slide backward, so that the engagement element 35 engages with the reverse rotation gear 39 and the propeller 19 “reverses”,
Ship 1 is moved backward.

A water pump 58 driven by the engine 16 is detachably attached to the upper surface of the case body 46 by a fastener 59. This water pump 58
Has a pump casing 60 constituting its outer shell, and the pump casing 60 is fastened to the upper case 6
1 and the lower case 62. Above case 6
The lower case 62 is made of stainless steel, and has a flat shape along the upper surface of the case body 46.

An impeller 63 is provided in the pump casing 60, and the impeller 63 is driven by the power transmission shaft 29.

When the power transmission shaft 29 is rotated by the drive of the engine 16, the impeller 63 is rotated in conjunction with this. Then, water 64 such as seawater is sucked up into the water pump 58, and this is pumped by the engine 16
It is designed to be used for cooling.

A part of the lower case 62 is extended forward, and the extending portion 66 is in pressure contact with the upper surface of the lid 51. As a result, the lid 51 is pressed and fixed to the case body 46 side.

To explain this more specifically, a notch 67 is formed at the front edge of the extending portion 66 which is a part of the pump casing 60. The notch 67 and the midway portion in the longitudinal direction of the shift rod 55 are removably fitted in the radial direction of the shift rod 55, and the notch 67 is formed.
The lid 51 is pressed to the case body 46 side by both side edges 66a, 66a.

Therefore, the lid 51 is entirely covered by the case body 4 by a part of the pump casing 60 of the water pump 58.
It will be clamped to the 6 side. Moreover, the pump casing 60 itself has sufficient strength and rigidity to withstand the internal pressure thereof.

Therefore, since the lid 51 is made of resin,
Although its own strength is low, the lid 51 is attached to the case body 46 side with sufficient attachment strength.

A projection 69, which is an engaging portion, is formed on the upper surface of the lid 51. On the other hand, the engaged portion that engages with the protrusion 69 in a disengageable manner is the notch 67. The protrusion 69 is removably fitted between the left and right side edges 66a of the cutout 67.

Therefore, when attaching the lid 51 and the water pump 58 to the upper portion of the case main body 46, first, the protrusion 69 of the lid 51 and the notch 6 of the water pump 58 are provided.
The above-mentioned attachment is performed while engaging with 7. Then,
By the engagement, the lid 51 is automatically and accurately positioned with respect to a predetermined position of the case main body 46, particularly, a predetermined position around the axis 53 of the lid 51.

Both sides of the projection 69 and the side edges 66
a and 66a are in line contact with each other in a plan view,
The lid 51 is firmly prevented from freely rotating around the axis 53 in the opening 48. In this respect also,
The attachment strength of the lid 51 to the case body 46 is improved.

[0054]

According to the present invention, the case is composed of the case body, the opening formed in the upper portion of the case body for opening the inside of the case body upward, and the lid body for opening and closing the opening. In the outboard motor, a shift rod for connecting the switching mechanism and the operating portion is provided through a through hole formed in the lid, and the water pump driven by the engine is detachably attached to the upper surface of the case body. By the pump casing of the water pump attached to the main body,
The lid body is pressed against the case body side, and an engaging portion is formed on the lid body, while an engaged portion with which the engaging portion is detachably engaged is formed on the pump casing. There is.

Therefore, the lid body is attached to the case body by being pressed against the case body side by the water pump attached to the case body.

Therefore, since the water pump is used to attach the lid, a separate fastener which has been conventionally required can be eliminated, and the case can be simplified in structure accordingly.

When attaching the lid and the water pump to the upper portion of the case body, first, the engaging portion of the lid and the engaged portion of the pump casing of the water pump are engaged with each other. To do. Then, with the above engagement,
The lid body is automatically and accurately positioned with respect to the predetermined position of the case body.

Therefore, since the positioning at the time of attaching the lid can be easily performed, the lid can be easily assembled to the case body, that is, the case assembling work can be easily performed.

In the above case, a notch is formed in a part of the pump casing of the water pump, and the notch and the midway portion of the shift rod in the longitudinal direction are fitted to each other in the radial direction of the shift rod so that they can be fitted into and removed from each other. The lid body may be pressed against the case body side by both side edges of the notch.

In this way, the lid body is entirely pressed against the case body side by a part of the pump casing of the water pump. Moreover, the pump casing itself has sufficient strength and rigidity to withstand the internal pressure thereof.

Therefore, even if the lid body is made of resin and its strength is low, the lid body is attached to the case body side with sufficient attachment strength. In addition, since the water pump is used for this attachment as described above, the improvement in the attachment strength of the lid can be achieved with a simple configuration.

[Brief description of drawings]

FIG. 1 is a partially enlarged sectional view of FIG.

FIG. 2 is an overall side view of an outboard motor.

3 is a partially enlarged view of FIG.

FIG. 4 is a view taken along line 4-4 of FIG.

[Explanation of symbols]

1 ship 3 hull 6 outboard motors 8 First pivot 11 Steering shaft 12 Steering bracket 16 engine 19 propellers 22 Lower case (case) 25 propeller shaft 38 Switching mechanism 42 Operation part 46 Case body 48 openings 51 lid 52 through hole 54 axis 55 shift rod 58 water pump 60 pump casing 67 Notch (engaged part) 69 Projection (engagement part)

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B63H 20/32

Claims (2)

(57) [Claims] 1. A case is provided which is attached to a hull side and at least a lower part of which can be submerged. A propeller is supported on a lower part of the case and the propeller is driven by an engine. A forward / reverse switching mechanism is provided, while a forward / reverse operating section is provided above the case, and the case is a main body of the case, and an opening formed in an upper portion of the main body of the case to open the interior of the main body of the case upward. A lid body that opens and closes the opening is provided, and a shift rod that connects the switching mechanism and the operating portion is provided through a through hole formed in the lid body, and is driven by the engine on the upper surface side of the case body. In an outboard motor in which the water pump is detachable, the lid body is the same as the above case due to the pump casing of the water pump attached to the case body. An outboard motor case structure in which an engaging portion is formed on the lid body so as to be pressed against the main body side, and an engaged portion with which the engaging portion is detachably engaged is formed in the pump casing. . 2. A notch is formed in a part of a pump casing of a water pump, and the notch and a midway portion in the longitudinal direction of the shift rod are fitted to each other in a radial direction of the shift rod so that the shift rod can be fitted and removed. The outboard motor case structure according to claim 1, wherein the lid body is pressed against the case body side by both side edges of the notch.