JPH08100647A - Cover structure for rotational body of vertical engine and hand starting pulley housed in cover - Google Patents

Abstract

PURPOSE: To prevent accumulation of heat on a lower side of a lower cover by composing a cover body covering a rotational body of the lower cover and an upper cover respectively covering the lower side and the upper side of the rotational body, and forming a ventilating suction port on the lower cover, and a ventilating exhaust duct on the upper cover. CONSTITUTION: A cover body 50 covers a rotational body A mounted on an upper end of a crank shaft 22, which cover body 50 includes a crank shaft pulley 31, a timing belt 33, a rotor 41 and a manually-driven starting pulley 42. The cover body is composed of a lower cover 51 and an upper cover 55 respectively covering a lower side and an upper side of the rotational body A, each being mounted on an engine block 23 or the like. A plurality of ventilating suction ports 51e are formed around a hole 51c at a bottom 51a of the lower cover 51. A ventilating exhaust duct 55 is provided on the upper cover 55, which duct 55d is opened upward oppositely to a lower side exhaust passage of the lower cover 51. Heat around the engine is smootly discharged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover structure for a rotary body of a vertical engine and a manual starting pulley housed in the cover body.

[0002]

2. Description of the Related Art Conventionally, as a technique for attaching a rotating body to an upper end of a crankshaft of a vertical type engine and covering the rotating body with a cover body, for example, Japanese Patent Laid-Open No. 59-10009.
The technique disclosed in Japanese Patent No. 3 is disclosed. As shown in the drawings of the above-mentioned publication, the technique is to attach a flywheel to the upper end of a crankshaft and cover the flywheel with a cover body. The cover body is a flat lower cover,
The upper cover covers the upper side of the lower cover, and the ventilation exhaust duct provided on the upper cover.
Hot air in the cover body is exhausted from the ventilation exhaust duct.

[0003]

In the above conventional technique, the hot air around the engine is trapped under the lower cover, the hot air that rises rises from the periphery of the cover body, and is re-energized with fresh air from the intake opening at the upper part of the engine. May be sucked into the engine. When hot air is drawn into the engine, it is not easy to improve the engine output.

Therefore, an object of the present invention is to prevent hot air from being trapped below the lower cover in a cover body having a lower cover.

[0005]

In order to achieve the above object, the present invention is for a rotating body of a vertical engine in which a rotating body is attached to an upper end portion of a crankshaft which is generally placed vertically and which is covered with a cover body. In the cover structure, the cover body is provided on an engine block and covers at least a lower side of the rotating body, an upper cover attached to the lower cover and covering at least an upper side of the rotating body, and at least a part of the cover body is provided on the lower cover. A cover structure for a rotating body of a vertical engine, comprising a ventilation intake port and a ventilation exhaust duct at least a part of which is provided in an upper cover.

A part of the ventilation exhaust duct is provided in the lower cover, and an exhaust passage is formed in cooperation with the upper cover.

The rotating body includes a manual starting pulley attached to a crankshaft via a generator rotor, and the manual starting pulley has a larger diameter than the generator rotor and has blades on the upper surface. Was set up.

[0008]

The hot air around the engine below the lower cover enters through the ventilation intake port, passes through the cover body, and is exhausted through the ventilation exhaust duct. For this reason, hot air does not collect under the lower cover.

The hot air passing through the cover body is guided in the exhaust passage and discharged from the ventilation exhaust duct.

Since the manual starting pulley functions as an exhaust fan, the hot air passing through the cover body is efficiently discharged from the ventilation exhaust duct.

[0011]

Embodiments 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.
First, a first embodiment will be described with reference to FIGS. FIG.
1 is a cross-sectional side view of essential parts of an outboard motor according to the present invention, in which an outboard motor 1 is mounted on a mount case 2 as an engine mounting member and is bolted to a vertical multi-cylinder engine 3; 2 and the extension case 4 that is bolted underneath, and this extension case 4
A vertical drive shaft 5 housed inside, a bevel gear set 7 housed inside a gear case 6 also connected to the lower part of the extension case 4, and a cooling water supply pipe 8 housed inside the extension case 4 and the gear case 6 as well. And an outboard motor body 1A including a water pump 9 and the like,
The outboard motor mounting means 11 is elastically supported and coupled to the outboard motor body 1A via a mount rubber.

The outboard motor mounting means 11 is a metal fitting for fixing the outboard motor 1 to the hull. The outboard motor mounting means 11 swings the outboard motor main body 1A left and right in plan view about the swivel shaft 12 and tilt shaft. 1
It is possible to flip up the outboard motor main body 1A including the swivel shaft 12 around the center 3 in the clockwise direction in the drawing. Outboard motor body 1A
The engine further includes an under case 15 and an engine cover 16 that is attachable to and detachable from the under case 15 for forming an engine room that accommodates the engine 3. The under case 15 is attached to and supported by the mount case 2.

A flywheel 17 is attached to the lower portion of a crankshaft 22 which will be described later.
7 is connected to a starter motor 19 via a ring gear 18 provided on the outer circumference thereof.

FIG. 2 is a side sectional view of a vertical multi-cylinder engine (first embodiment) according to the present invention. The vertical multi-cylinder engine 3 is, for example, a 4-cylinder engine, and the axis of the cylinder 21 is oriented substantially sideways. With the crankshaft 22 oriented vertically, the joint surface between the cylinder block 23 and the cylinder head 24 is substantially vertical, and the camshaft 27 and the like are housed in the valve operating chamber 25a formed by the cylinder head 24 and the head cover 25. It Reference numeral 26 is a crankcase, and 29 is a piston inserted in the cylinder 21.

The upper portion of the crankshaft 22 projects from the cylinder block 23, and the upper portion of the camshaft 27 projects from the cylinder head 24. Crankshaft 2
Crankshaft pulley 31 mounted on top of 2
A timing belt 33 is wound around the camshaft pulley 32 attached to the upper part of the camshaft 27, and a proper tension is applied to the timing belt 33 by a timing belt tensioner 34.

The upper part of the crankshaft 22 (engine 3
A manual starting pulley 42 is attached to the outer side of the timing belt 33 (on the side opposite to the engine) via the rotor 41 for the AC generator (generator).
The crankshaft pulley 31, the camshaft pulley 32, the timing belt 33, the tensioner 34, the rotor 41 and the manual starting pulley 42 are the cover bodies 50.
Covered with.

Hereinafter, the crankshaft pulley 31, the timing belt 33, the rotor 41, and the manual starting pulley 42 are collectively referred to as "rotating body A" attached to the upper end of the crankshaft 22. The cover body 50 is attached to the engine block 23 or the like, and covers a lower cover 51 that covers at least the lower side of the rotating body A, and the lower cover 51.
And an upper cover 55 that covers at least the upper side of the rotating body A.

The lower cover 51 has a bottom portion 51a, a peripheral wall portion 51b provided upright around the bottom portion 51a, and a bottom portion 51a.
The first hole 51c and the second hole 51d opened in the
1a, a plurality of ventilation inlets (slits) 51e ... (... indicates a plurality, the same applies hereinafter) formed appropriately around the first hole 51c. The first hole 51c is a hole through which the crankshaft 22, the tensioner 34, and the like pass, and the second hole 51d is a hole through which the camshaft 27 and the like pass. First
The cover body 50 is attached to the upper ends of the cylinder block 23, the cylinder head 24, and the crankcase 26 by fitting the edge portions of the hole 51c and the second hole 51d to them. A part of the bottom portion 51a extends obliquely upward and also serves as a peripheral wall portion. The upper cover 55 has a shape corresponding to the lower cover 51 in a plan view, and includes a canopy portion 55a and a peripheral wall portion 55b around the canopy portion 55a.

FIG. 3 is a plan view of a vertical multi-cylinder engine (first embodiment) according to the present invention (in a state where an engine cover, a generator rotor and a manual starting pulley are removed). The tensioner 34 is the cylinder block 2
3 is attached to the outer surface of the upper portion of the timing belt 33 by a mounting position adjusting bolt 35 for adjusting the tension of the timing belt 33, and the timing belt is adjusted by adjusting the locking relationship between the mounting position adjusting bolt 35 and the elongated hole 34a of the tensioner 34. Three
The tension of 3 can be adjusted. Reference numeral 36 is a coil spring that elastically springs the tensioner 34 toward the timing belt 33.

An intake silencer box 44, throttle valve devices 45 and intake manifolds 46, which are the same in number as the number of cylinders, are arranged on the side of the cylinder block 23. Further, 47 is a blow-by gas recirculation tube that connects the head cover 25 and the intake silencer box 44, and 48 is an electrical equipment box that houses an ignition coil and a CDI unit.

4A and 4B are plan views of the essential parts of the lower cover and the upper cover (first embodiment) according to the present invention. FIG. 4A shows the plane of the lower cover, and FIG. 4B shows the plane of the upper cover. The lower cover 51 has a partition wall 51f extending inward from the peripheral wall 51b and provided upright from the bottom 51a, and a plurality of flanges 51g formed on the outer surface of the peripheral wall 51b.
Bolt-fastening holes 5 formed in these flanges 51g ...
1h and a plurality of locking projections 51i formed on the outer surface of the peripheral wall 51b. A space formed by the peripheral wall portion 51b and the partition wall portion 51f is a lower exhaust passage 51j forming a part of a ventilation exhaust duct described later.

The upper cover 55 has an upper exhaust passage 5 extending opposite the lower exhaust passage 51j of the lower cover 51.
5c, a ventilation exhaust duct 55d opened upward from the tip of the upper exhaust passage 55c, and a flange 55f having a bolting hole 55e formed at a position corresponding to the bolting hole 51h of the lower cover 51. , And a fitting recess 55g that fits with the locking projection 51i of the lower cover 51 by snap fit.

The structure of the cover body 50 will be further described. At least a part of the ventilation intake ports 51e ... (See FIG. 2) is provided in the lower cover 51, and the structure is also provided in the upper cover 55. Good. At least a part of the ventilation exhaust duct 55d is provided in the upper cover 55, and the ventilation exhaust duct 55d may be provided in the lower cover 51 as well. In addition, the ventilation exhaust duct 55
Part d of this duct is provided in the lower cover 51 and cooperates with the upper cover 55 to form an exhaust passage. That is, the exhaust passage is configured by cooperation of the lower exhaust passage 51j and the upper exhaust passage 55c in a state where the lower cover 51 and the upper cover 55 are overlapped with each other.

FIG. 5 is a cross-sectional view of the mating portion (first embodiment) of the lower cover and the upper cover. The protrusion 51k formed on the upper edge of the peripheral wall 51b of the lower cover 51 and the peripheral wall of the upper cover 55 are shown in FIG. The lower cover 51 and the upper cover 55 can be easily aligned with each other by fitting with the recessed portion 55h formed at the lower edge of 55b.

FIG. 6 is a block diagram of a manual starting pulley (first embodiment) according to the present invention, in which (a) is a plane and (b) is a plan view.
Indicates a cross section. The manual starting pulley 42 has a diameter larger than that of the generator rotor 41 (see FIG. 2), and is formed on the central base portion 42a formed in a bowl shape which is generally prone in cross section, and on the lower outer periphery of the base portion 42a. Disc-shaped pulley part 4
2b and a plurality of reinforcing ribs 4 radially formed from the outer periphery of the base portion 42a to the vicinity of the outer periphery of the pulley portion 42b.
2c, a plurality of bolt insertion holes 42d formed on the upper surface of the base portion 42a, a plurality of openings (round holes) 42e formed vertically through the pulley portion 42b, and a pulley portion 4
The winding groove 42f formed on the outer periphery of the 2b and the plurality of hooking recesses 42 formed on the outer periphery of the upper surface of the pulley portion 42b.
g ... and.

The reinforcing ribs 42c ... Are plate-shaped vertical in a plan view, and the bolt insertion holes 42d.
(See FIG. 2) bolted to the opening 42
e ... is arranged at a position larger in diameter (outer circumference) than the outer diameter of the rotor 41, and the winding groove 42f is for winding a starting rope (not shown), and the hooking recess 42g.
... is to hook the end of the starting rope. Further, the reinforcing ribs 42c also have the function of fan blades. Note that the bolt insertion holes 42d ... Align with the mounting bolt holes that are provided in the rotor 41 at a position larger in diameter than the crankshaft 22.

The operation of the engine having the above structure will be described below. In FIG. 1, the crankshaft 22
Is started via the starter motor 19, the ring gear 18, and the flywheel 17. In addition, in FIG.
When starting the crankshaft 22 manually, the engine cover 16 and the upper cover 55 are removed, and a starting rope (not shown) is wound around the manual starting pulley 42 and rotated. While the crankshaft 22 is rotating,
Since the rotor 41 rotates, the alternator produces electricity.

The camshaft 27 is accurately driven by the crankshaft 22 via the crankshaft pulley 31, the timing belt 33 and the camshaft pulley 32. Then, the timing belt 33 is applied with an appropriate tension by a timing belt tensioner 34.

Next, the operation of the cover body 50 will be described with reference to FIG. The hot air around the engine 3 below the lower cover 51 enters from the ventilation intake port 51e ...
0 through the exhaust passage 55j shown in FIG. 4 including the lower exhaust passage 51j and the upper exhaust passage 55c to the outside of the engine cover 16 from the ventilation exhaust duct 55d. Therefore, it is possible to reduce the accumulation of hot air below the lower cover 51.

Further, as the manual starting pulley 42 rotates, the reinforcing ribs 42c of the manual starting pulley 42 serve as the blades of the exhaust fan, and rotate clockwise in FIG. 3 to cover the cover body 50. The hot air passing therethrough is efficiently discharged from the ventilation exhaust duct 55d.

Next, a modification of the cover body 50 of the first embodiment will be described with reference to FIG. FIG. 7 is a modified example of the cover body (first embodiment) according to the present invention.
The lower cover 51 and the upper cover 55 of the
It is a structure that is connected by 8 ... Therefore, the lower cover 5
1 and the upper cover 55 can be reduced in the number of places where bolt connection and snap fit connection are performed, and the cover body 50
Is easy to open and close. Further, the ventilation exhaust duct 55d is most distant from the line segment CL connecting the center of the crankshaft 22 and the center of the camshaft 27 (L1> L2).
, The hinge 58 is provided on the side where the ventilation exhaust duct 55d is provided, and the fitting recess 55g is provided on the side opposite to the ventilation exhaust duct 55d (snap fit connection). The cover 55 can be opened wide.

Next, a second embodiment will be described with reference to FIGS. 8 and 9. The same components as those in the second embodiment are designated by the same reference numerals and the description thereof will be omitted. FIG. 8 is a plan view of the vertical multi-cylinder engine (second embodiment) according to the present invention (in a state in which the engine cover, the generator rotor and the manual starting pulley are removed). As the manual starting pulley 42 rotates, the reinforcing ribs 42c 'of the manual starting pulley 42 act as the blades of the exhaust fan, and in the figure rotate clockwise to cover the cover body 50.
The hot air that passes through is efficiently discharged from the ventilation exhaust duct 55d.

FIG. 9 is a block diagram of a manual starting pulley (second embodiment) according to the present invention, in which (a) is a plane and (b) is a plan view.
Indicates a cross section. The manual starting pulley 42 has a base 42
a plurality of reinforcing ribs 42c ′ ... Radially formed from the outer periphery of a to the vicinity of the outer periphery of the pulley portion 42b,
These reinforcing ribs 42c '... Are plate-shaped curved in the arrow X direction in a plan view. Further, the reinforcing ribs 42c '... Also have the function of fan blades.

According to the structure of the second embodiment, since the reinforcing ribs 42c '... Are curved in the direction of the arrow X in a plan view, the amount of exhausted air can be increased. Also, the reinforcing ribs 42c '...
As shown by the imaginary line F in (b), the amount of exhaust air can be further increased by forming the shape to extend to the upper end of the manual starting pulley 42.

[0035]

Since the present invention is configured as described above, it has the following effects. A rotating body cover structure for a vertical engine according to claim 1, wherein a lower cover is attached to the engine block and covers at least a lower portion of the rotating body, and an upper cover attached to the lower cover and covering at least an upper portion of the rotating body. And at least a part of the ventilation inlet provided in the lower cover, and at least a part of the ventilation exhaust duct provided in the upper cover, hot air around the engine below the lower cover is a ventilation inlet. Since it enters from the inside and is discharged from the ventilation exhaust duct through the cover body, the hot air can be smoothly discharged to the outside of the engine cover through the cover body, and the hot air can be prevented from being trapped below the lower cover.

In the cover structure for the rotating body of the vertical type engine according to the second aspect, the ventilation exhaust duct is provided with a part of the ventilation exhaust duct on the lower cover, and the exhaust passage is configured in cooperation with the upper cover. Therefore, the hot air passing through the cover body can be smoothly discharged through the exhaust passage.

According to a third aspect of the present invention, there is provided a manual starting pulley housed in a cover body, which includes a manual starting pulley mounted on a rotating body via a rotor for a generator. Since the pulley has a larger diameter than the rotor for the generator and the blades are provided on the upper surface, the pulley for manual starting plays the role of an exhaust fan.
The hot air passing through the cover body can be efficiently discharged.

[Brief description of drawings]

FIG. 1 is a cross-sectional side view of essential parts of an outboard motor according to the present invention.

FIG. 2 is a side sectional view of a vertical engine (first embodiment) according to the present invention.

FIG. 3 is a plan view of a vertical multi-cylinder engine (first embodiment) according to the present invention (in a state where an engine cover, a generator rotor and a manual starting pulley are removed).

FIG. 4 is a plan view of an essential part of a lower cover and an upper cover (first embodiment) according to the present invention.

FIG. 5 is a sectional view of a mating portion (first embodiment) of a lower cover and an upper cover according to the present invention.

FIG. 6 is a configuration diagram of a manual starting pulley (first embodiment) according to the present invention.

FIG. 7 is a modified example of the cover body (first embodiment) according to the present invention.

FIG. 8 is a plan view of a vertical multi-cylinder engine (second embodiment) according to the present invention (in a state in which an engine cover, a generator rotor and a manual starting pulley are removed).

FIG. 9 is a configuration diagram of a manual starting pulley (second embodiment) according to the present invention.

[Explanation of symbols]

1 ... Outboard motor, 3 ... Vertical multi-cylinder engine, 16 ...
Engine cover, 22 ... Crank shaft, 23 ... Cylinder block, 31 ... Crank shaft pulley, 32
… Camshaft pulley, 33… Timing belt, 3
4 ... Timing belt tensioner, 41 ... Generator rotor, 42 ... Manual start pulley, 42c, 42
c '... blade (reinforcing rib), 50 ... rotating body, 51 ... lower cover, 51e ... ventilation inlet, 51j ... lower exhaust passage, 55 ... upper cover, 55c ... upper exhaust passage, 5
5d ... Exhaust duct for ventilation.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area F02N 3/02 D

Claims (3)

[Claims] 1. A rotating body cover structure for a vertical engine in which a rotating body is attached to an upper end portion of a crankshaft which is placed substantially vertically, and the rotating body is covered with a cover body, wherein the cover body is attached to an engine block. A lower cover that covers at least the lower side of the rotating body, an upper cover that is attached to the lower cover and covers at least the upper side of the rotating body, a ventilation intake port at least a part of which is provided in the lower cover, and at least a part of the upper cover. A cover structure for a rotating body of a vertical type engine, which comprises an exhaust duct for ventilation. 2. The ventilation exhaust duct, wherein a part of the ventilation exhaust duct is provided in the lower cover and cooperates with the upper cover to form an exhaust passage. A cover structure for a rotating body of the described vertical engine. 3. The rotating body according to claim 1 includes a manual starting pulley attached to a crankshaft via a generator rotor, the manual starting pulley being more than the generator rotor. A manual starting pulley housed in a cover that has a large diameter and has blades on the upper surface.