JPH09301284A - Fitting construction for water inlet for propeller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fitting construction for a water inlet for a propeller which can be fit the water inlet in a suction port without any step. SOLUTION: A cooling water suction port 28 is formed in a molded case 11 of a propeller and a water inlet 76 is fit the suction port 28. The water inlet 76 has a front wall 76a for covering opening surface 28a of the suction port and a side wall 76b continuously formed in a periphery edge of the front wall and inserted into the port 28 and an abut part 82 abutting a butting seat surface 28b of the suction port when inserted into suction port 28. A side surface 28c of the suction port 28 opposite to the side wall of the water inlet is cut and also the butting seat surface of the suction port to which the abutting part of the water inlet is abut is left at primary state.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a motor boat,
The present invention relates to a water inlet mounting structure for a propulsion unit mounted on a ship such as a yacht or a fishing boat.

[0002]

2. Description of the Related Art Conventionally, a casting case of a propulsion device of a ship is formed with a suction port for taking in cooling water for cooling an engine of the propulsion device. In order to improve the suction efficiency of the suction port and prevent the suction port from causing a propulsion resistance, a water inlet is fitted and attached to the suction port. Then, in the case formed by casting, particularly sand casting, the suction port and the like are cut to attach the water inlet, and the cutting method will be described with reference to FIG. FIG. 5 is a cross-sectional view of the case of the propulsion device.

In FIG. 5, a case 01 of a propulsion machine is cast in a sand mold or the like, and an opening 02 for a propeller shaft to which a drive system such as a propeller shaft of the propulsion machine is attached and a suction port 03 are formed in the case 01. Has been done. However, since the case 01 is cast in a sand mold or the like, a corner portion, for example, the outer surface 01 of the case 01 is formed.
The corner of the boundary between a and the inner surface 02a of the propeller shaft opening 02, the corner of the boundary between the outer surface 01a of the case 01 and the inner surface 03a of the suction port 03, etc. are crushed and rounded.

Therefore, when the water inlet or the propeller shaft is attached to the as-cast case 01, a gap is generated at the boundary between the water inlet and the suction port 03, the boundary between the propeller shaft and the propeller shaft opening 02, and the like. Therefore, the suction port 03, the propeller shaft opening 02 and the like are made slightly smaller in size, and after casting, the corners and inner surfaces of the suction port 03 and the propeller shaft opening 02 are cut and molded. At the time of this cutting, the case 01 is positioned by a positioning jig 05, and a cutting machine such as an end mill is used with this jig 05 as a reference to perform accurate cutting in accordance with the dimensions of the water inlet and the propeller shaft. There is. In this way, the propeller shaft, the water inlet, etc. are attached to the cut propeller shaft opening 02 and suction port 03. The tip of the water inlet on the insertion side is the abutting seat surface 0 of the suction port 03.
3b.

[0005]

By the way, Case 01
Is positioned by the jig 05, but since the case 01 is formed by sand casting, etc., there are subtle irregularities on the surface, and if the position of the case 01 placed on the jig 05 is displaced, Due to the influence of the height of the unevenness, the cutting reference may deviate from the intended position. Then, the distance between the abutting seat surface 03b of the suction port 03 and the outer surface 01a of the case 01, the depth h0 of the suction port 03 becomes deeper or shallower than a predetermined depth. When the depth h0 of the suction port 03 is different from a predetermined value in this way, a step is generated between the front surface, which is the outer surface of the water inlet fitted in the suction port 03, and the outer surface 01a of the case 01. Propulsion resistance may increase or it may not look good.

In order to improve the cutting accuracy of the suction port 03, in addition to the standard for cutting the propeller shaft opening 02, the standard for cutting the suction port 03 is set at the location of the suction port 03. However, the number of steps for setting the standard is increased and the manufacturing cost is increased.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a water inlet mounting structure for a propulsion machine in which the water inlet can be fitted into the suction port without steps.

[0008]

The casting case (11) of the propulsion device (1) of the present invention includes a cooling water suction port (2).
8) is formed, and the water inlet (76) is fitted into this suction port. And in order to achieve the said objective, a water inlet is a front wall (76a) which covers the opening surface (28a) of the said suction opening.
A side wall (76b) which is continuously formed on the peripheral edge of the front wall and is inserted into the suction port, and an abutment seat surface (28) of the suction port when inserted into the suction port.
b), the side surface (28c) of the suction port facing the side wall of the water inlet is cut, and the contact portion of the water inlet is The abutting seating surface of the abutting suction port remains bare.

In some cases, the propulsion unit is of the contra-rotating propeller type.

Further, the suction port may be located in front of the propeller shaft (41, 42).

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a mounting structure for a water inlet of a propulsion device according to the present invention will be described with reference to FIGS. FIG. 1 is a side view of an outboard motor as a propulsion device. FIG. 2 is a sectional view of the lower portion of the outboard motor. FIG. 3 is an enlarged view of a main part of FIG. FIG. 4 is a view of the water inlet and the suction port, (a) is a sectional view of the water inlet attached to the suction port, (b) is a sectional view of the suction port, and (c) is a sectional view of the water inlet. Is.

In FIG. 1, an outboard motor 1 as a propulsion device is provided with a mounting bracket 3 via a swivel shaft 2 and the like. By fixing the mounting bracket 3 to the stern of the small boat 6 such as a motor boat, the outboard motor 1 is attached to the small boat 6 so as to be rotatable in the left-right direction and the vertical direction.

The outboard motor 1 is covered with a housing composed of an upper cowling 8, a lower cowling 9, an upper casing 10 and a lower casing 11 in order from the upper side. Inside the upper cowling 8 and the lower cowling 9, an engine 14 shown by a broken line is stored. An output shaft of the engine 14 projects downward and is connected to a drive shaft 16 disposed inside the upper casing 10 and the lower casing 11, and a pair of front and rear propellers 21 are connected via a power transmission device 18 described later in detail. , 22 are rotationally driven. The power transmission device 18 is arranged in the lower casing 11 together with a forward / reverse switching mechanism 24, which will be described in detail later. Further, the forward / reverse switching mechanism 24 moves forward,
It is switched between reverse and neutral, and is provided on a lever (not shown) provided on the operation handle 27 of the outboard motor 1 or a steering unit (not shown) of the small boat 6 via a connecting member 26 such as a shaft or a link. It is operated with the lever etc.

Further, in the front part of the lower casing 11,
A cooling water suction port 28 is provided. Then, the pump 29 provided in the middle of the drive shaft 16
However, the water outside the lower casing 11 is sucked through the suction port 28 to cool the engine 14, an oil pan (not shown), and the like.

Next, details of the power transmission device 18 and the forward / reverse switching mechanism 24 will be described with reference to FIGS. 2 and 3. The drive shaft 16 extends in a substantially vertical direction and is rotatably supported by the lower casing 11 and the like. A drive bevel gear 31 is fixed to the lower end of the drive shaft 16. A pair of front and rear passive bevel gears 32 and 33 mesh with the driving bevel gear 31,
The passive bevel gears 32 and 33 face each other. The front-side passive bevel gear 32 is rotatably supported by the lower casing 11 via a bearing 36, while the rear-side passive bevel gear 33 is fixed to the lower casing 11 via a bearing 37. It is rotatably supported by a cylindrical support case 38.

By the way, the propeller shaft 41 driven by the bevel gears 31, 32, 33 which are the power transmission device 18,
42 is composed of two pipe-shaped outer propeller shafts 41 and an inner propeller shaft 42 that is fitted coaxially inside the outer propeller shaft 41. The outer propeller shaft 41 is rotatably supported by the support case 38, while the inner propeller shaft 42 is rotatably supported by the outer propeller shaft 41 and the front-side passive bevel gear 32. And the outer propeller shaft 41
The front propeller 21 is fixed to the rear end portion of the outer propeller shaft 41, while the rear end of the inner propeller shaft 42 is fixed to the outer propeller shaft 41.
Projecting rearward from the rear end of this propeller shaft 42
A rear propeller 22 is fixed to the rear end of the rear side.

The front end of the outer propeller shaft 41 projects through the rear passive bevel gear 33, and the rear dog clutch 45 for the outer propeller shaft 41 is spline-fitted, that is, integrated with the front end portion. It is mounted so that it can rotate and is slidable in the axial direction. The passive bevel gear 33 and the outer propeller shaft 41 are configured to be rotatable. In this way, the tubular rear dog clutch 45 is arranged between the front and rear passive bevel gears 32 and 33, and the front and rear ends of the dog clutch 45 are provided with the pawls 45a and 45b, respectively. Has been formed. Then, when the dog clutch 45 on the rear side slides to the front side, the pawl 45a on the front side causes the pawl 32 of the passive bevel gear 32 on the front side to move.
When the rear dog clutch 45 slides rearward, the rear claw 45b engages the claw 33a of the rear passive bevel gear 33.

The front end of the inner propeller shaft 42 is
It projects forward from the front end of the outer propeller shaft 41, penetrates the front bevel gear 32 on the front side, and projects further forward. A front dog clutch 47 for the inner propeller shaft 42 is spline-fitted to the front end portion of the inner propeller shaft 42. The passive bevel gear 32 on the front side and the inner propeller shaft 42 are configured to be rotatable. A claw 47a is formed at the rear end of the tubular front dog clutch 47.
When is slid rearward, the pawl 47a engages with the front pawl 32b formed at the front end of the front passive bevel gear 32. The dog clutches 45 and 47 form the forward / reverse switching mechanism 24.

A ring-shaped engagement groove 49 is formed on the peripheral surface of the front dog clutch 47, and the pin 52 of the shift cam 51 is fitted in the engagement groove 49. The shift cam 51, which is this shift member, is rotatably supported by the lower casing 11 with its rotation axis substantially in the vertical direction, and the pin 52, which is the operating portion, has the shift cam 5
It is formed so as to be eccentric with respect to one rotation axis. The shift cam 51 is fixed to a shaft 55, and the shaft 55 is connected to the connecting member 26 shown in FIG. Then, when an operation lever (not shown) is operated, the connecting member 26, the shaft 55, and the like rotate, and accordingly, the shift cam 51 rotates and the pin 52 is displaced in the front-rear direction. The front dog clutch 47 moves back and forth due to the front and rear displacement of the pin 52.

The rear dog clutch 45 is constructed to interlock with the front dog clutch 47, and its structure will be described. Inner propeller shaft 4
A clutch cylinder 58 is disposed inside the shaft 2 so as to be movable in the axial direction. The front dog clutch 47 is connected to a front portion of a clutch cylinder 58 by a front connecting pin 60, and a front long hole 42a is formed in the inner propeller shaft 42 so that the front connecting pin 60 can move back and forth. Has been done.
A rear connecting pin 62 is attached to the rear portion of the clutch cylinder 58, and collars 63 are attached to both ends of the rear connecting pin 62. And the connecting pin 62
Is engaged with the dog clutch 45 on the rear side via the collar 63 and the pair of front and rear washers 64. The rear connecting pin 62 rotates together with the front dog clutch 47, the front connecting pin 60 and the clutch cylinder 58 together with the inner propeller shaft 42, while the rear dog clutch 45 together with the outer propeller shaft 41. Is rotating. Therefore, the rear coupling pin 62 and the rear dog clutch 45 are engaged with each other such that they can rotate relative to each other about the axes of the propeller shafts 41 and 42 and can be interlocked in the axial direction. . Further, the inner propeller shaft 42 is formed with a rear long hole 42b so that the rear connecting pin 62 can be moved back and forth.

Further, a pair of front and rear pieces 67 is provided in the clutch cylinder 58, and a plurality of balls 70 are arranged between the pair of pieces 67. The pieces 67 are constantly urged by a spring 71, which is an urging means, so that the pieces 67 come close to each other, and press the ball 70 outward. By this pressing, the ball 70 can be engaged with the annular groove 73 formed on the inner surface of the inner propeller shaft 42.

In the neutral state shown in FIGS. 2 and 3, the claws 45a of the dog clutches 45 and 47,
45b and 47a are claws 32 of the bevel gears 32 and 33 for passive use.
The rotation of the drive shaft 16 is not transmitted to the propeller shafts 41 and 42 because the drive shaft 16 is not engaged with the shafts a, 32b, and 33a. Therefore, the propulsive force is not applied to the small vessel 6. Further, the ball 70 is engaged with the groove 73, and the clutch cylinder 58 is prevented from moving in the axial direction by the ball 70. Therefore, the neutral state can be stably maintained.

From the neutral state in which the ball 70 is engaged with the groove 73, the shift cam 51 is rotated by applying a force in the clockwise direction to resist the urging force of the spring 71 and the ball 70 and the groove 73.
To disengage from. Then, pin 5 of the shift cam 51
2 moves to the front side, and accordingly, the dog clutches 47 and 45 move to the front side. The front pawl 45a of the rear dog clutch 45 is connected to the front bevel gear 32 on the front side.
Engagement with the claw 32a of the
Front passive bevel gear 32 and rear dog clutch 4
5 is transmitted to the outer propeller shaft 41. Then, the front propeller 21 rotates, and the small boat 6 moves backward.

On the other hand, from the neutral state, the shift cam 51 is rotated by applying a force in the counterclockwise direction to release the engagement between the ball 70 and the groove 73, and the pin 52 of the shift cam 51 moves to the rear side. The dog clutches 47 and 45 move rearward in conjunction with the movement of the pin 52. The pawl 47a of the front dog clutch 47 engages with the front pawl 32b of the front passive bevel gear 32, and the rear pawl 45b of the rear dog clutch 45 is rear passive. It engages with the claw 33a of the bevel gear 33. Then, the rotation of the drive shaft 16 is transmitted to the inner propeller shaft 42 through the front-side passive bevel gear 32 and the front-side dog clutch 47, and the rear-passive bevel gear 33 and the rear-side dog clutch are transmitted. It is transmitted to the outer propeller shaft 41 via 45. Then, the pair of front and rear propellers 21 and 22 rotate in mutually opposite directions, and the small boat 6 advances. In addition,
The rotation direction of the front propeller 21 is rotating in the direction opposite to the reverse direction.

The suction port 28 described above is provided immediately in front of the propeller shafts 41, 42 which are rotationally driven in this manner, and the suction port 28 is shown in FIG.
A pair of left and right water inlets 76 shown in (c)
Is fitted in and fixed by being tightened with a bolt 77 and a nut 78. Each water inlet 76
Is a front wall 76a that covers the opening surface 28a of the suction port 28.
And a side wall 76b formed continuously with the peripheral portion of the front wall 76a, and an opening forming portion 76c for mounting a bolt.
It consists of And water inlet 76
The front wall 76a is substantially flush with the opening surface 28a of the suction port 28 and has a circulation hole 81 which is a circulation opening through which water passes. Further, the tip end portion 82 as the contact portion of the bolt forming opening forming portion 76 c of the water inlet 76 contacts the butting seat surface 28 b of the suction port 28.

On the other hand, the lower casing 11, which is a case in which the suction port 28 is formed, is sand-molded, and its corners are rounded and crushed as in the conventional example shown in FIG. Therefore, the suction port 28 is formed smaller than the water inlet 76 as in the conventional example, and is accurately cut by a cutting machine such as an end mill after casting. In FIG. 4 (b), the shape at the time of casting is shown by the broken line, and the state becomes the solid line by cutting. That is, the cutting location is the side wall 76 of the water inlet 76.
The portion facing b, that is, the side surface 28c of the suction port 28
And the tip 8 on the insertion side of the water inlet 76
The abutting seat surface 28b of the suction port 28 with which 2 abuts is not cut.

By the way, the opening surface 28a and the abutting seat surface 2
The distance from 8b, that is, the depth h for attaching the water inlet of the suction port 28 is cast by the mold of the same shape, and does not differ between the lower casings 11 and is substantially constant. Therefore, at the suction port 28 of the first lower casing 11, the water inlet 76
When the dimension of is determined, the water inlet 76 having the same dimension can be used for the lower casing 11 thereafter. The dimensions of the water inlet 76 are such that the front wall 76a is substantially flush with the outer surface 11a of the lower casing 11 when the tip 82 abuts against the butting seat surface 28b, that is, the front wall 76a. Is determined to be substantially flush with the opening surface 28a of the suction port 28.

As described above, in the embodiment, the side surface 28c of the suction port 28 is cut according to the size of the side wall 76b of the water inlet 76. By this cutting, the corner portion of the boundary between the surface 11a of the lower casing 11 and the side surface 28c of the suction port 28 can be sharply formed instead of being rounded. On the other hand, regarding the abutting seat surface 28b of the suction port 28, the size of the water inlet 76, particularly the distance between the tip portion 82 and the front wall 76a, is determined by the dimension of the cast suction port 28, particularly the abutting seat surface 28b and the opening surface 28a. It matches the distance with. When the size of the water inlet 76 is matched with the suction port 28 of the first lower casing 11,
Later, the same size can be applied.

Further, the propulsion device is a contra-rotating propeller,
Since the blade area is increased by the amount of the double propellers, the positions of the propeller shafts 41 and 42 with respect to the water surface can be raised more than in the case of the uniaxial propeller.

Moreover, even if the positions of the propeller shafts 41, 42 are raised, the suction port 28 is arranged in front of the propeller shafts 41, 42, which is lower than that of the conventional propeller shafts 41, 42. The cooling water can be surely sucked in through the mouth 28.

The embodiment of the present invention has been described above in detail.
The present invention is not limited to the above embodiment,
Within the gist of the present invention described in the claims,
Various changes can be made. Modification examples of the present invention are exemplified below. (1) In the embodiment, the side surface 2 of the suction port 28
8c is cut over almost the entire area, but at least a portion facing the side wall 76b of the water inlet 76 may be cut, and other portions are not necessarily cut. On the other hand, the abutting seat surface 28b of the suction port 28 only needs to have the ground surface at the time of casting without cutting at least the portion where the contact portion of the water inlet 76 contacts.

(2) In the embodiment, the contact portion is
The water inlet 7 is the tip of the opening forming portion 76c for mounting the bolt of the water inlet 76.
It is also possible to form it on the side wall 76b of No. 6. (3) In the embodiment, the propeller is a contra-rotating propeller, but a uniaxial propeller is also possible.

(4) In the embodiment, the suction port 28 is located in front of the propeller shafts 41, 42, but it need not necessarily be in front of the propeller shafts 41, 42. However, when the suction port 28 is located in front of the propeller shafts 41 and 42, the position of the suction port can be made lower than when the suction port is arranged above the propeller shaft as in the conventional propulsion machine. As a result, even if the position of the propeller shaft with respect to the water surface is higher than in the conventional case, the cooling water can be reliably sucked from the suction port.

(5) In the embodiment, the propulsion device is an outboard motor, but it may be a propulsion device other than the outboard motor, for example, an inboard / outboard motor. (6) In the embodiment, the water inlet 7
The entire front wall 76a of 6 is the opening surface 2 of the suction port 28.
8a is formed to be substantially flush with the lower casing 1
1 does not occur at the boundary between the front surface 11a of the water inlet 76 and the front wall 76a of the water inlet 76, the entire front wall 76a of the water inlet 76 is substantially flush with the opening surface 28a of the suction port 28. It is not always necessary to make the number one, and it is also possible to form the guide portion for water intake or the like by protruding or denting.

[0035]

According to the present invention, the side surface of the suction port facing the side wall of the water inlet is cut.
Therefore, the corner part that is the boundary between the outer surface of the case of the propulsion machine and the side surface of the suction port is crushed and rounded during casting, but the corner part is sharply formed by cutting the side surface of the suction port. can do. As a result, a gap is less likely to be generated between the water inlet and the suction port. Moreover, the abutting seat surface of the suction port with which the abutment portion of the water inlet abuts remains as it is during the casting. The distance between the abutting seat surface and the opening surface of the suction port is almost the same in each case cast by the mold having the same shape. Therefore, in the first case, if the dimensions of the front wall of the water inlet and the abutment part are adjusted to the distance between the butting seat surface and the opening surface of the suction port, the water inlet of the same dimensions will be used in the latter case. It will fit exactly when you insert. As a result, it is possible to prevent the occurrence of a step that acts as propulsion resistance at the boundary between the front wall of the water inlet and the surface of the case.

Further, when the propulsion unit is of the contra-rotating propeller type, the blade area increases as much as the propellers are doubly arranged. Therefore, the position of the propeller shaft with respect to the water surface is set to be larger than that of the uniaxial propeller. Can also be raised. As a result, the part of the propulsion unit submerged below the surface of the water is reduced, and the propulsion resistance is reduced.

Further, the suction port may be located in front of the propeller shaft. In this case, since the suction port is arranged lower than in the conventional case, the suction port is rarely exposed in the air, and the cooling water can be reliably sucked from the suction port. In particular, the cooling water can be surely sucked from the suction port even when the position of the propeller shaft with respect to the water surface is raised by using the contra-rotating propeller type.

[Brief description of drawings]

FIG. 1 is a side view of an outboard motor as a propulsion device.

FIG. 2 is a sectional view of a lower portion of an outboard motor.

FIG. 3 is an enlarged view of a main part of FIG.

FIG. 4 is a view of a water inlet and a suction port, (a) is a cross-sectional view showing a state where the water inlet is attached to the suction port, (b) is a cross-sectional view of the suction port, and (c) is water. It is sectional drawing of an inlet.

FIG. 5 is a sectional view of a case of the propulsion device.

[Explanation of symbols]

 1 Outboard Motor (Propulsion Machine) 11 Lower Casing (Case) 28 Suction Port 28a Opening Surface 28b Butting Seat Surface 28c Side 41, 42 Propeller Shaft 76 Water Inlet 76a Front Wall 76b Side Wall 82 Tip (Abutting Part)

Claims (3)

[Claims] 1. A propulsion machine in which a casting case of a propulsion machine is provided with a cooling water suction port, and a water inlet is fitted into the suction port, wherein the water inlet is an opening of the suction port. A front wall that covers the surface, a side wall that is continuously formed on the peripheral edge of the front wall and that is inserted into the suction port, and an abutment that abuts against the abutting seat surface of the suction port when inserted into the suction port. And a side surface of the suction port facing the side wall of the water inlet is cut, and the abutting seat surface of the suction port with which the contact portion of the water inlet abuts is The water inlet mounting structure of the propulsion device, which is characterized by being left bare. 2. The mounting structure for a water inlet of a propulsion device according to claim 1, wherein the propulsion device is a counter-rotating propeller type. 3. The suction port is located in front of the propeller shaft.
Water inlet mounting structure for the propulsion machine described.