JPS5916994B2 - ship propulsion system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates generally to starting mechanisms for internal combustion engines, such as those used in marine propulsion systems having reversing transmissions.

In the past, it was sometimes possible to start the engine when the transmission was in gear.

Starting the engine in this manner is undesirable for several reasons, including the risk of steeply listing the vessel supporting the propulsion system.

A prior art device was developed in 1971 that prevents the starting mechanism from starting the engine when the reverse transmission mechanism is in the driving state.
U.S. Patent Application No. 156,22 filed June 24,
No. 7, US Patent Application No. 250,041, filed March 3, 1972, and US Patent Application No. 272,552, filed July 17, 1972.

Other examples of prior art devices for preventing the engine from starting when the reversing transmission is in drive are U.S. Pat. No. 1 US patent granted on 3rd.
, 231,637.

The invention relates to an engine having a starting gear, a starter including a rotatable starting shaft, a starting pinion supported on the starting shaft for movement relative to the starting shaft to a position in which it engages the starting gear, and a starting shaft. a device for rotating the starter shaft in two opposite directions; and a device that cooperates with the starter shaft and starter pinion to displace the starter pinion to a position in which it engages the starter gear in response to rotation of the starter shaft in one direction; a vessel propulsion system comprising: a device cooperating with a starter shaft and selectively positionable in a first position for preventing rotation of the starter shaft in one direction and a second position for rotating the starter shaft; It provides:

The present invention also provides a selectively positionable device in a position that prevents rotation of the starting shaft in a direction that displaces the starting pinion to the engaged position when the engine transmission is in the drive condition and when the transmission is in the neutral condition. A device is provided for connecting to an engine transmission mechanism movable between a neutral condition and a driving condition to position the selectively positionable device in a position that allows rotation of a starting shaft at a given time. .

Still more particularly, the present invention provides a rod-shaped rod movable axially within the recess of the starter shaft to prevent rotation of the starter shaft and movable out of the recess to a retracted position to allow the starter shaft to rotate freely. The present invention provides a locking bolt that is a member of the invention.

The locking bolt, which is a bar-shaped member, retreats from the recess when the transmission mechanism is in the neutral state, and the starting mechanism starts the engine, and when the transmission mechanism is in the driving state, the bolt is removed by the action of the bias spring. is connected by a cam to a transmission actuating mechanism which allows the engine to move into the recess, thereby disabling the starting mechanism.

The present invention also provides for starting the bolt against biasing action in response to rotation of the starting shaft in a direction opposite to the direction that would normally cause the starting pinion to be displaced into a position to engage the starting gear. It is adapted to be displaced outwardly from the recess in the shaft.

One principal object of the present invention is to provide a propulsion system for a ship that includes a device for preventing the starting mechanism from operating when the transmission mechanism is in the driving state.

Another major feature of the invention is a starting mechanism lock that includes a bolt selectively movable into and out of a recess in the starting shaft to prevent rotation of the starting shaft and to permit rotation of the starting shaft. It is in the stop device.

Other objects and advantages of the present invention will be understood from the following description with reference to the accompanying drawings.

Before setting forth a detailed description of the invention, it should be noted that while the invention is capable of other embodiments and of being carried out in various other ways, the principles of the invention may be understood to be similar to the structure and arrangement of parts shown in the accompanying drawings. It is important to understand that it is not limited to

It should also be understood that the terms used herein are used for descriptive purposes and are not meant to be limiting.

The drawings show a propulsion system for a boat, which in the illustrated example is an outboard motor 11, which has various features of the present invention and can be of various shapes.

The outboard motor includes a propulsion unit 13 consisting of a power head 17 and a lower unit 21.

Power head 17 includes an engine block 23;
The engine block 23 includes a starting gear or flywheel gear 27 and a starter or starting mechanism 29 mounted on the engine block 23 and adapted to engage the starting gear 27 and start rotation of the engine when activated. .

The lower unit 21 has a portion that is normally underwater,
This part rotatably supports the propeller 31 and has a latch or reversing transmission mechanism 33 that can be switched between a neutral state, a forward drive state, and a reverse drive state.

The reverse transmission mechanism 33 extends vertically within the lower unit 21,
The lower end is operatively connected to the reversing transmission mechanism 33 and the upper end is operated by a control rod 37 extending near the engine blank 23.

The control rod 37 is pivotally connected at its upper end to the outer end of a lever 39, which lever is supported on a portion of a suitably rotatably supported switching control shaft 41, which control shaft has one end connected to the power head. - Extends outward from the cover 43 and is actuated by the actuation lever 42.

That is, the transmission mechanism 33 can be swung to operate either manually or by a remote device connected to the transmission mechanism 33.

The starting mechanism 29 includes a vertically extending hole 49 connected to the engine block 23 and supporting a starter drive shaft 51.
A housing or support bracket 47 containing a.

The starter drive shaft 51 includes a starter pinion 53 for rotation and axial movement relative to the starter drive shaft 51.
is supported, and the pinion is movable between an engaged or first position in which it meshes with the starting gear 27 and a second or retracted position in which it disengages from the starting gear 27 below the engaged position. It is.

A device is provided for rotating the starting shaft 51 so that the starting pinion 53 can be displaced into a position of engagement with its starting gear 27 and for starting the engine when the starting pinion 53 engages the starting gear 27.

Although various arrangements are possible, in the illustrated embodiment such a device is formed by connecting the lower end of the starting shaft 51 to a pulley 57 to which a pulling rope (not shown) is attached. Ru.

The upper end of the starting shaft 51 is fixed to a recoil spring 59,
This recoil spring is housed in a recess 61 of the support bracket 47, and its other end is fixed to the support bracket 47.

Thus, in operation, when the pulling rope is pulled, the starting shaft 51 initially rotates in a first direction, counterclockwise as viewed in FIG. 3, thereby coiling the spring 59.

The reaction coil 59 then unwinds thereby causing the starting shaft 51 to rotate in the opposite direction, ie, clockwise as viewed in FIG.

Other devices may be used to rotate the starter shaft 51 within the scope of the present invention.

Shaft 51 and pinion 53 are provided with means for moving starter pinion 53 from a retracted position to a locked position in response to rotation of starter shaft 51 in a first direction.

Although various other arrangements are possible, in the construction shown such a device consists of a bub 69 formed in the starting pinion 53, which bub 69 is positioned on both sides thereof and is axially inclined and circumferentially inclined. A slot 71 extending in the direction
and a drive pin 79 fixed to the starting shaft 51 and extending diametrically therefrom, the ends of which are received in the slots 71.

It is also in accordance with the invention to use a device consisting of a single slot and a drive pin having only one end received in the slot, and a device consisting of a slot provided in the drive shaft and a pin extending into the slot from the pinion. falls within the range of

□The slot 71 and the drive pin 79 are the starting pinion 5.
3 is positioned at the retracted position described above, the drive pin 7
9 is positioned at the upper end of the inclined slot 71 to move the starting pinion 53 from the retracted position to the engaged position when the starting shaft 51 rotates in the first or counterclockwise direction as viewed in FIG. then start the engine.

As the starting shaft 51 rotates counterclockwise as viewed in FIG. 3 and the drive pin 79 is housed in the slot 71, the resistance spring 81 cooperates to move the starting pinion 53 to the retracted position. , the resistance spring 81 engages a circular portion 83 engaging a circumferential groove in the starting pinion 53 and a suitable ear or stop 89 extending from the support bracket 47 . and an engaging extension 87 .

Due to the frictional force exerted by the drag spring 81 that opposes the rotation of the starter pinion together with the starter shaft 51, the starter shaft 51 initially rotates counterclockwise as viewed in FIG. 3, thereby moving the starter pinion 53 from the retracted position to the engaged position. advance.

As in the prior art, engine ignition causes the engine to operate at a rotational speed higher than the rotational speed of the starter pinion 53 thereby retracting the starter pinion 53 from the engaged position to the retracted position.

According to the invention, the first position cooperates with the starting shaft 51 to prevent the starting shaft 51 from rotating in a direction that allows the starting pinion 53 to move into the engaged position and the starting position allows the starting shaft 51 to rotate. A second position and a selectively positionable device are provided.

Furthermore, according to the invention, the selectively positionable device is positioned in a first position when the transmission mechanism 33 is in the drive state and in a second position when the transmission mechanism is in the neutral state. It is connected to the transmission mechanism 33 so as to be positioned at the position shown in FIG.

Although various arrangements are possible, in the preferred embodiment shown, such positionable devices are in a spaced apart relationship parallel to the radial direction of the axis of starting shaft 51 as shown in FIG. a hole 91 extending into the bracket or housing 47 such that
3), the inner end portion 95 of the bolt 93 is located in the recess 9.
The inner end portion 95 of the bolt 93 is pulled out of the recess 97 so that the starter shaft 51 is positioned within the bracket or housing 47 in a first or plugged position and prevents the starter shaft 51 from rotating. It includes an inner end portion 95 that is movable between an exterior, drawer or retracted position to allow free rotation.

Still further in accordance with the invention, a device is provided for inserting or biasing the bolt 93 into the first position.

Although a variety of configurations are possible, in the illustrated embodiment such a device includes internal and external counterbore holes 101 in bore 91;
103 is provided in the inner counterbore 101 around the bolt 93, the inner end is engaged with a snap ring 107 around the bolt 93, and the outer end is screwed into the outer counterbore 103. It is formed by positioning a helical biasing spring 105 in pressure contact with a holder 109 having a hole in the center so as to guide the axial movement of the spring 93 .

Still further in accordance with the present invention, recess 97 in starter shaft 51 resists the action of spring 105 to remove bolt 93 in response to clockwise rotation of starter shaft 51 as viewed in FIG. It is formed so that it can be displaced in the opposite direction.

In this regard, the bore 91 is positioned parallel to and offset from a radial line extending from the axis of the starter shaft 51 and the recess 97 is positioned at the inner end of the bolt 93 when the bolt 93 is in the inserted position. spaced side walls 111.1 capable of engaging the sides of the portion 95 and the inner end surface of the bolt 93;
Contains 13.

Therefore, the side wall 111 of the recess is connected to the inner end portion 95 of the bolt 93.
By engaging the side portion of the starting shaft 51, rotation of the starting shaft 51 in a counterclockwise direction as viewed from FIG. 3 is prevented.

When the starting shaft 51 is rotated clockwise as viewed in FIG. The starting shaft 51 is pushed axially in a ratchet manner.
allows it to rotate clockwise.

Furthermore, according to the invention, a device is provided for selectively positioning the bolt 93 in the inserted position and the withdrawn position according to the state of the transmission mechanism 33.

More specifically, the transmission mechanism 33 allows the spring 105 to position the bolt 93 in the plug-in position when the transmission mechanism 33 is in the drive condition, and the bolt 9 when the transmission mechanism 33 is in the neutral condition.
3 in the retracted or extended position.The starter shaft is connected to the bolt 93 by a linkage 121 that allows the starter pinion 53 to rotate in a direction effective to engage the starter gear 27.

Although other configurations are possible, in the preferred configuration shown, the linkage 121 is pivotally connected at one end to an arm 125 extending from the shaft switching control shaft 41 and at the other end to the outer end of the bolt 93. cam or link 123 which is received in a slot 127 provided in the.

a first recessed portion 133 in which the cam or link 123 is sequentially disposed in the slot 127 provided in the outer end of the bolt 93 when the transmission mechanism 33 is in forward drive, neutral state and reverse drive; Complex shaped member 131 including a raised portion 135 and a second recessed portion 137
Contains.

Cam 123 holds cam member 131 in slot 127 and pulls bolt 93 out of recess 97 in starting shaft 51 when transmission mechanism 33 is in the neutral position, and pulls bolt 93 out of spring 105 when transmission mechanism 33 is in the forward or reverse position. The bolt 93 is inserted into the recess 97 of the starting shaft by means of a device which allows the bolt 93 to ratchet outwardly in response to rotation of the starting shaft 51 in a clockwise direction as viewed in FIG. operatively connected.

Such a device is in the form of a transverse pin 141 that acts as a spring-loaded follower engaged with member 131, although other devices may be used.

If desired, the connection between the transmission mechanism 33 and the bolt 93 can be made to ensure that the bolt 93 can be operated in both directions of its axial movement.

For this purpose, a cam slot (not shown) can be provided at the upper end of the linkage, which reliably controls the movement of the bolt 93 according to the state of the transmission mechanism 33.

In operation, when the switching lever 42 moves forward or backward, the cam member 131 is positioned so that the spring 105 inserts the bolt 93 into the recess 97 of the starting shaft, thereby preventing the starting shaft from rotating;
Also, as previously mentioned, in response to clockwise movement 9 of starter shaft 51, bolt 93 moves in a manner similar to a ratchet device.

This rotation of the starting shaft, if not blocked, would result in the starting pinion 53 engaging the starting gear 27.

When the switching lever 42 moves to the neutral position, the cam member 13
1 to pull the bolt 93 out of the recess 97 of the starting shaft, thereby moving the starting pinion 53 into the starting gear 2.
7 to allow free rotation of the starter shaft in a counterclockwise direction effective to advance it into a position where it engages.

[Brief explanation of the drawing]

FIG. 1 is a side view of an outboard motor equipped with various features of the present invention;
2 is an enlarged view of a portion of the mechanism of FIG. 1, partially shown in side view, partially in sectional view, and partially in perspective view; FIG.
The figure is a sectional view taken approximately along line 3--3 in FIG. 2. 27...-starting gear, 29...-starter,
51...starting shaft, 59...starting shaft rotating device, 71.79...cooperating device, 91,93...selectively positioned equipment.

Claims (1)

[Claims] 1. An engine having a starting gear and a starting device,
The starter includes a rotatably mounted starter shaft having recesses having circumferentially spaced ends, and a retainer on the shaft which is movable relative to the shaft and meshes with the starter gear. a pinion provided to be movable to a mating position; a device for rotating the starting shaft in two opposite directions; and a device provided on the starting shaft and the pinion so as to rotate the starting shaft in one direction; a device for moving the pinion to the engaged position in response to rotation; and a device for selectively blocking rotation of the starter shaft, the selectively blocking device comprising:
axially along a path of travel parallel to a line extending radially from a central axis of the starter shaft, a first position penetrating into the recess to prevent rotation of the starter shaft in the one direction; a rod-shaped member that is selectively movable between a second position where the rod-shaped member is detached from the recess and allows rotation of the starter shaft, and when the rod-shaped member is in the first position; It has a side surface that engages with one end of the recess to prevent rotation of the starter shaft in the one direction, and one end of the rod-like member has a side surface that engages with one end of the recess to prevent the starter shaft from rotating in the one direction. A watercraft propulsion device configured to engage the other end of the recess and displace the rod-shaped member from the first position to a position where it separates from the recess.