JP2003074345A - Water-cooled v type outboard engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily form a cooling water passage by utilizig an oil pan in an outboard engine having a water-cooled V-engine mounted thereon. SOLUTION: In the water-cooled V-outboard engine, external water as cooling water is fed from one water pump, branched midways, and fed to cooling water jackets in the bank of the V type engine. The upper surface of the mounting flange part 161 of the oil pan 160 is extended forward, a recessed part 163 opening upward is formed in the extended part 160a cover the lateral direction of the engine, a feed water inlet 166 from the water pump is connected between the right and left sides of the recessed part 163, and the outlets 163d and 163d of the right and left banks of the engine to the cooling water jackets are provided at the right and left rear portions thereof.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outboard motor equipped with a water-cooled V-type engine. 2. Description of the Related Art The prior art is disclosed in Japanese Patent Application Laid-Open No. 62-207.
No. 93 discloses a structure having a V-shaped auxiliary cooling water passage, which is not described in detail. Judging from the drawings, it is considered that the passage is formed by drilling, and two cooling water passages are formed. A water pump-side inlet is provided near the tilt axis in front of the water outlet. JP-A-09-4
Japanese Patent Application Laid-Open No. 1967 discloses a technique in which a branch passage is formed below an oil pan of a V-type engine. [0003] In the above-mentioned prior art, in the former (Japanese Patent Laid-Open No. 62-20793), the passage is formed by drilling, so that it is difficult to form a hole, and it is troublesome and troublesome. Disadvantageous in manufacturing. The latter (Japanese Unexamined Patent Publication No.
In Japanese Patent Application Laid-Open No. 9-41967, the branch passage portion of the cooling water is constituted by the oil pan and the parts connected to the lower part thereof, so that the number of parts increases and the number of working steps also increases. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a cooling water jacket for a left and right bank of an outboard motor equipped with a water-cooled V-type engine. The branch supply of cooling water can be easily and reliably performed using the components of the oil pan, and the left and right branch cooling water supply ports can be formed without requiring machining such as drilling. It is an object of the present invention to provide a water-cooled V-type engine outboard motor capable of smoothly draining water. [0005] In order to solve the above-mentioned problems, a first aspect of the present invention is a water-cooled V-type outboard motor, in which outside water is supplied from a single water pump to supply cooling water, and is branched on the way. A water-cooled V-type engine outboard motor for supplying cooling water to the cooling water jackets of the left and right banks of the V-type engine, wherein the upper surface of the mounting flange of the oil pan is extended forward,
A recess opening upward is formed in the extension so as to extend in the left-right direction of the engine. A water supply inlet from the water pump is connected between the left and right of the recess, and the engine The outlets to the cooling water jackets of the left and right banks are provided. According to the first aspect of the present invention, the branch passage for the cooling water and the inlet of the cooling water are formed by using the mounting flange portion of the oil pan on the engine side, so that the passage and the inlet can be formed at the time of forming the oil pan. In addition, drainage can be performed smoothly. An embodiment of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. In the drawing, the front in the propulsion direction is represented by Fr, and the rear is represented by Rr. FIG. 1 is an external view of the entire outboard motor with the outboard motor attached to the stern of the hull. The outboard motor 1 is composed of an engine cover 2 for covering the uppermost engine, an under cover 3 below this, an extension case 4 below this, and a gear case 5 in which a screw 6 is arranged below this rear. 100 stern 101
Is mounted and supported via a stern bracket 7 so as to be tiltable (up and down) and left and right (steering). The extension case 4 and the gear case 5 constitute a main body case of the present invention. The tilt-up state is indicated by a chain line. FIG. 2 is a side view of the engine cover on the upper portion of the outboard motor, which is taken along a line 3-3. FIG. 3 is a view taken along line 3-3 of FIG. 2, and an intake silence box 35 and an intake manifold 37 which will be described later in FIG.
FIG. 4 is an enlarged vertical sectional side view of a main part of FIG. The upper structure including the engine of the outboard motor will be described with reference to these drawings. The engine 10 includes a cylinder block 11, a front crankcase 12, a rear cylinder head 13, a cylinder head cover 14 disposed at a rear end of the cylinder block 11, and the like. In the cylinder block 11, a plurality of cylinders 15 (... Represents a plurality, the same applies hereinafter) having a horizontal axis are vertically arranged in parallel, and a built-in piston 16 is vertically connected by a connecting rod 17. This is a vertical engine connected to a crankshaft 18. In the present embodiment, an outboard is equipped with a three-cylinder engine having three cylinders at the top and bottom, and a V-type six-cylinder engine having a cylinder row composed of three cylinders expanded left and right as shown in FIG. Machine. Thus, the engine subassembly is configured. As shown in FIG. 4, the cylinder head 13 is provided with combustion chambers 19 forming the ceiling of the cylinders 15. Combustion chambers 19 have intake valves 20 and exhaust valves 21
, An ignition plug 22. A vertical camshaft 23 is provided outside the combustion chambers 19, and a vertical rocker arm shaft 24 that supports a valve rocker arm driven by the camshaft 23. A cylinder cooling water jacket 25 is provided around the cylinders 15 of the cylinder block 11 so as to communicate with each other, and a cylinder head cooling water jacket 26 is also provided around the combustion chamber 19 of the cylinder head 13. , And are provided so as to communicate with the cooling water jacket 25. At the upper end of the crankshaft 18 protruding upward from the crankcase 12, a driving pulley 27,
28 is provided coaxially, and the upper pulley 28 is connected to the crankcase 1
2 is connected via a belt 31 to a driven pulley 30 of a generator 29 installed on the upper front side of the upper part 2 to drive the generator 29. The lower pulley 27 is connected to camshaft pulleys 33 provided on the upper ends of the camshafts 23 of the left and right cylinder heads 13 via guide pulleys 32 by a belt 34 to drive the camshafts 23. . An intake silence box 35 is disposed above the belt-pulley mechanism described above. The intake silence box 35 has an intake port opened rearward, and the intake port is located between the left and right cylinders between the V banks. Connected to the throttle valve device 36 disposed at The throttle valve device 36 is connected to an intake manifold 37 disposed vertically in the rear between the V banks between the left and right cylinders, and the intake manifold 37 is connected to an intake passage formed in the cylinder head 13 to connect the intake system. Constitute. Air is taken in from the outside air intake 2a of the engine cover 2. Exhaust manifolds 40, 40 connected to exhaust passages of the combustion chambers 19, as shown in FIG. 2, are provided outside each of the cylinder heads 13, 13 of the left and right cylinder blocks 11, 11, respectively. Exhaust manifold 40, 4
0 is a bolt 4 on each outer portion of the cylinder heads 13 and 13.
0a... Are integrally assembled, and eight bolts 40a... A cooling water jacket 42 is provided around the exhaust passage 41a of each main body portion 41, and cools exhaust gas discharged from the combustion chambers 19 at the most upstream portion. In the lower portion 41b of the main body portion 41 of each exhaust manifold 40, an internal exhaust passage is inclined inward. Since the exhaust manifolds 40, 40 are installed outside the left and right cylinder blocks 13, 13, the lower portions 41b, 41b of the left and right main body portions 41, 41 are symmetrically inclined inward. These exhaust manifolds 40, 40, an internal passage of a mount case described later, an exhaust pipe, an exhaust expansion chamber, and the like constitute an exhaust passage structure. That is, the exhaust passage is divided into a plurality of portions. FIG. 5 is an enlarged longitudinal sectional view showing the relationship between the lower portion of one of the exhaust manifolds 40 disposed on the left and right and the mount case internal passage connected to the lower portion 41b thereof, the exhaust pipe, and the exhaust expansion chamber. FIG. 6 is an enlarged longitudinal sectional view of a main part showing a cooling water discharge port and an exhaust manifold of a cylinder block disposed on the left and right, and a discharge path of cooling water to an exhaust expansion chamber. FIG. 3 is a view of the outboard motor as viewed from behind. A description will be given with reference to these drawings and FIG. A description will be given with reference to FIG. Engine 10
An engine subassembly composed of a combination of the crankcase 12, the cylinder block 11, the cylinder head 13, and the piston 15, the crankshaft 18, etc., is mounted on a mount case 50 disposed below the engine subassembly. It is attached and supported on the coupling surface 50p.
Since the oil pan and a part of the mount case also have an engine function, the upper half of the engine excluding them has a small assembly. Horizontal direction of mount case 50 (width direction of outboard motor)
Are provided with concave portions 51, 51 which are open upward. Although the figure shows the concave portion 51 on the right side of the mount case, the concave portion 51 on the left side of the mount case (not shown) also has a symmetric shape and a symmetric structure in which the left and right are switched. The concave portion 51 has an upper surface opening 52
Are fully open, the inner wall 51a is substantially vertical,
b is curved so as to dive inward in the width direction, and an annular embankment 5 is provided at the bottom.
A circular hole 53 having 1c (annular convex portion) is provided. The lower portion 41b of the main body portion 41 of the exhaust manifold 40 is located at a portion closer to the outside of the opening 52 of the concave portion 51. The lower portion of the lower portion 41b has upper and lower annular ridges 41c and 41d. A substantially horizontal Z-shaped intermediate exhaust pipe 5 constituting an internal passage of the mount case 50 is provided in the recess 51.
4 and an annular groove 54 provided on the upper part of the exhaust pipe 54.
The inner annular ridge portion 41c of the lower portion 41b of the main body portion 41 of the upper exhaust manifold 40 is fitted to a. The lower end of the intermediate exhaust pipe 54 is provided with an annular groove 54b, and a part of the inner part is provided with a boss 54c. An annular groove 54b at the lower end of the intermediate exhaust pipe 54
Is fitted to an annular bank portion 51c at the bottom of the concave portion 51 of the mount case, whereby the lower portion 41b of the main body portion 41 of the exhaust manifold 40 communicates with the circular hole 53 provided at the bottom of the concave portion 51 by the intermediate exhaust pipe 54. ,Connecting. In addition, the intermediate exhaust pipe 5
4 is engaged with a stepped portion 51d provided at the bottom of the concave portion 51, and is coupled with a bolt 55 to form the concave portion 51c.
Mounted and supported within. A cover 5 is provided on the upper surface opening 52 of the recess 51.
6 is covered and completely closed. The cover 56 partially includes a lower portion 41 b of the main body 41 of the exhaust manifold 40.
A circular hole 56a is fitted into the outer annular ridge 41d and the periphery of the upper end of the intermediate exhaust pipe 54, and these are fitted into the circular hole 56a to ensure the communication between the intermediate exhaust pipe 54 and the exhaust manifold 40. I do. A boss portion 56b is provided in the peripheral portion of the cover 56, and bolts 57 are vertically passed between a part of the inner portion of the boss portion 56b and a part of the inner wall 51a of the concave portion 51 to fix the cover 56 to the mount case 50. I do. By the way, there are a plurality of bolted portions to the periphery of the concave portion 51 of the cover 56, and this connected portion is a concave portion excluding the outermost portion of the concave portion 51 which affects the external dimensions in the width direction of the outboard motor. It is provided around 51 (front and back in the figure). In FIG. 5, for convenience, another part 51e around the concave portion 51 is shown.
The connecting portion with the boss portion 56b and the imaginary line (chain line) of the bolt 57 is deviated to the right in the drawing. By this bolt arrangement, interference between the outermost portion near the concave portion 51 of the mount case 50 and the undercover 3 is avoided, and the requirement for downsizing of the outboard motor is achieved. As described above, the intermediate exhaust pipe 54 constitutes the internal passage of the exhaust manifold 40, and the cooling water chamber surrounding the intermediate exhaust pipe 54 in a space inside the concave portion provided in a part of the mount case 50 closed by the cover 56. A cooling water jacket 58 is formed. That is, in the entire outboard motor, the mount case 50 and the intermediate exhaust pipe 54 are integrated into a support case for the engine. The extension case 4 is arranged on the lower surface of the mount case 50, and the extension case 4 is joined together.
a and the extension case 4 including this part
To the upper surface of An oil pan 60 is joined to the lower surface of the mount case 50 via a metal gasket (not shown) inside the extension case 4. A part of a mounting flange of the oil pan to the mount case is extended to form a mounting portion 61 of the exhaust pipe 64. The attachment part 61 is provided with a communication part 62 that forms an exhaust passage. The communication portion 62 is connected upstream to the wall surface of the exhaust passage of the circular hole 53 of the mount case 50, and is connected downstream to the exhaust pipe 6.
4 has a wall surface 62a connected thereto. The upper end of the communication portion 62 communicates with and connects to the downstream passage 54f of the intermediate exhaust pipe 54. The upper end of the exhaust pipe 64 is attached to the lower end of the communication portion 62 with a stay 65 and a bolt 66. From 54 to the exhaust pipe 64 is communicated. The exhaust pipe 64 is an exhaust expansion chamber 6 which is a space in the main body case around the exhaust pipe 64.
The exhaust gas is exhausted to 7. As described above, in this embodiment, the peripheral portion of the circular hole 53 of the mount case 50 corresponds to the second exhaust passage member in the downstream connection portion.
For example, the second exhaust passage may be constituted by the exhaust pipe mounting portion 61 or the exhaust pipe 64. The mounting portion 61 of the oil pan 60 is provided with a recess 61a sunk downward, and the mounting case 50
Bottom 59 of concave portion 51 has concave portion 5
9b is provided. Cooling water pumped by a water pump, which will be described later, is sent to the concave portion to form a water passage 63. The water passage 63 is connected to the cooling water chamber 58 via the communication passage 68. A drive shaft 18a connected to the crankshaft 18 and driving the screw 6 described above vertically passes through the extension case 4 and the gear case 5 constituting the main body case.
It is guided to a gear mechanism in the gear case 5. Referring to FIG. 6, a chamber 25a communicating with the cooling water jacket 25 of the uppermost cylinder bore 15 of the cylinder block 11 of the engine 10 is connected via a thermostat 71 to a thermostat cover 69 and a pipe 70.
Thus, it is connected to the drain passage 72 of the exhaust manifold 40 described above. Thus, when the cooling water of the engine exceeds a predetermined temperature, the thermostat 71 is opened, and the cooling water in the cooling water jacket 25 is discharged to the drain passage 72 of the exhaust manifold 40. A lower portion of the exhaust manifold 40 communicates with a discharge port 72b (pipe), and is connected through an L-shaped joint 73 to a discharge passage 74 on the lower surface of the mount case 50 and to the exhaust expansion chamber. In FIG.
82 serves as a discharge pipe for discharging the residual water in the cooling water jacket 25 of the cylinder block 11 when the water pump 76 stops. FIG. 7 is a schematic explanatory view of a cooling water circuit of an engine and an exhaust system. Exhaust manifolds 40, 40 having a cooling water jacket are provided outside the cylinder blocks 11, 11 having the cooling water jackets 25, 25, respectively. Seawater or the like is pumped up by a supply pipe 77 by a pump 76 through a strainer 75 which is a water inlet at the lower end, and cooling water is introduced into the cooling water jacket 25 of the cylinder blocks 11, 11 through through holes 25b, 25b. Connecting passage 6
Cooling water is introduced into the cooling water chambers 58, 58 via the cooling passages 68 to cool the internal passages 54 of the mount case 50. The cooling water in the cooling water chambers 58 is introduced into the cooling water jackets 42 of the exhaust manifold 40 to cool the exhaust manifold 40. The arrows indicate the flow of cooling water, and the cooling water jackets 42 of the exhaust manifold 40 flow into the cylinder heads 13 while cooling the exhaust passage. The water discharged after the thermostat 71 is discharged from the discharge passage 74 while cooling a part of the exhaust passage through the drain passage of the exhaust manifold 40. The residual water in the cooling water jackets 25, 25 of the cylinder block 11 is connected to the water supply side via tubes 81, 82, so that after the water pump is stopped, a water intake formed by a strainer is provided. Drained from 75. Also, cooling water jackets 42, 42 of the exhaust manifold 40
Similarly, the discharge of the cooling water and the discharge of the cooling water from the cylinder blocks 11 and 11 are also returned to the water supply side. In FIG. 7, reference numeral 78 denotes a vapor separator, which supplies a part of the cooling water to the surroundings through a branch pipe 79 to cool the sub fuel tank. Numeral 61 designates an exhaust pipe 64 attachment portion of the extension of the oil pan 60 as described above. The extension has a branch passage and an inlet for external water, and also includes cylinder blocks and cylinder heads of the V bank of the engine. For example, since an outlet for supplying cooling water is provided at the outlet port, this is shown in detail in FIG. Since the oil pan is described below, reference numeral 160 is an oil pan, and the oil pan is described in detail. FIG. 8 is a plan view of the oil pan, with the engine removed and viewed from above. Oil pan 160
A mounting flange portion 161 to the engine side is provided in the peripheral portion of the upper end portion, and an oil accommodating recess 162 that swells downward and hangs down is formed in the middle portion. The front half of the flange portion 161 is extended forward from the oil storage portion 162 to form an extension portion 160a. The front portion 161a of the flange portion 161 and the left and right portions 161b, 161 of the extension portion 160a.
B, a passage 163 connecting the front part to the left and right parts is provided in a concave shape, and the passage 163 is partitioned from the outside and the oil accommodating recess 162 by front and rear and left and right inner and outer mounting edge surfaces 164 and 165. A cooling water inlet 166 connected to a supply pipe 77 is provided at a central portion of the passage 163 in the left-right direction. The supply pipe 77 is used to supply seawater or the like, which is external water pumped up by the pump 76, to the cooling water inlet 166. 166 to the passage 163. The inlet 166 opens into the passage 163, and the upper end 77a of the supply pipe 77 is fitted through a grommet 167 into a hole 166a formed at the bottom of the passage, and the stopper 168 and the bolt 1
At 69, it is fixed to the oil pan 160 side. The passage 163 is branched right and left from the inlet 166 to form left and right branch passages 163a, 163a. Each end of the passage 163 extends rearward on the left and right, and the rear (rear) of the left and right extension passages 163b, 163b. The left and right portions of the shift portion) have symmetrically arcuate end passages 163c, 163c, respectively.
Are provided so as to communicate with each other, and are installed in the center portions of the end passages 163c, 163c so as to penetrate the circular holes 170, 170 vertically. The intermediate exhaust pipes 54, 5 described above are inserted into the circular holes 170, 170.
Reference numerals 171... Indicated by chain lines in FIG. 4 denote cooling water jackets such as an exhaust manifold disposed above.
In the figure, reference numerals 172... Are bolt holes for connecting the oil pan to the engine side. The above-described oil pan 160 is cast by casting an aluminum alloy or the like. The mounting flange, the passage 163 provided on the upper surface thereof, the inlet 166, the circular hole 170 forming the delivery port, the oil accommodating recess 162, and the like are integrally cast and formed. Therefore, the cooling water passage, the intake port for external water, and the delivery port can be formed without requiring machining such as drilling. The left and right passages 163a, 1
Between 63a, an inlet 166 for cooling water from the supply pipe 77 is provided at a front portion of the outboard motor, and in a tilt-up state shown by a chain line in FIG. 1, the inlet 1 facing the front Fr of the outboard motor in FIG.
The cooling water 66 is inclined downward, and the cooling water discharged from the cooling water jacket of each part of the engine is quickly and smoothly drained from the downwardly inclined inlet 166. According to the present invention, the following effects are exhibited by the above configuration. According to a first aspect of the present invention, there is provided a water-cooled V-type outboard motor, in which outside water is supplied with cooling water from one water pump, and is branched on the way to supply cooling water to cooling water jackets of left and right banks of the V-type engine. A water-cooled V-type engine outboard motor, wherein an upper surface of a mounting flange portion of an oil pan is extended forward, and a recess opening upward is formed in the extension portion so as to extend in the left-right direction of the engine. Between the left and right of the recess,
A water supply inlet from the water pump was connected, and outlets to the cooling water jackets of the left and right banks of the engine were provided at rear left and right portions. In the first aspect, the branch passage for cooling water and the inlet of cooling water are formed by utilizing the flange portion of the oil pan to be cast on the engine side. The cooling water passage, the cooling water inlet, and the outlet to the engine can be manufactured without any machining such as drilling. Therefore, it is extremely advantageous in manufacturing, and the number of parts does not increase because the cooling water passage and the entrance are integrated in the oil pan, and no assembling work is required. The above is also advantageous. In addition, since the inlet is provided in the mounting flange in front of the oil pan, when the outboard motor is tilted up, the inlet tilts down to the lowest position and the drainage of cooling water in the engine cooling water jacket is smooth. Quickly.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external view of the entire outboard motor with the outboard motor attached to the stern of the hull. FIG. 2 is a view taken along line 3-3 in FIG. 2, and a plan view of FIG. 2 with the intake silence box and intake manifold removed; FIG. 4 is an enlarged longitudinal sectional side view of a main part of FIG. 2; FIG. 6 is an enlarged vertical cross-sectional view showing a lower portion, an internal passage connected to the lower portion, an exhaust pipe, and an exhaust expansion chamber. FIG. 6 shows a cooling water discharge port and an exhaust manifold of a cylinder block, and cooling water to an exhaust expansion chamber. FIG. 7 is a schematic explanatory view of a cooling water circuit of an engine and an exhaust system. FIG. 8 is a plan view of an oil pan.
FIG. 9 is an enlarged sectional view taken along the line 9-9 in FIG. 8 [Description of symbols] 1 ... outboard motor, 10 ... engine, 60, 160 ... oil pan, 160a ... extension, 161 ... mounting flange, 163 ... concave passage 163d ... Exit.

Claims (1)

Claims: 1. A water-cooled V-type outboard motor, wherein cooling water is supplied from a single water pump to the outside water, the cooling water is branched on the way, and the cooling water jackets of the left and right banks of the V-type engine are provided. A water-cooled V-type engine outboard motor that supplies cooling water to the oil pan, wherein an upper surface of a mounting flange portion of an oil pan is extended forward, and a concave portion that opens upward extends in the lateral direction of the engine. A water supply inlet from the water pump was connected between the left and right sides of the concave portion, and outlets to the cooling water jackets of the left and right banks of the engine were provided at the rear left and right portions, A water-cooled V-type engine outboard motor.