JPS6033711B2 - stern drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stern drive system, and more particularly to a stern drive system capable of supporting an engine in a vibration-isolated manner from a ship's hull.

An example of a screw-type device for adjusting stern drive trim is disclosed in U.S. Pat. No. 372, granted March 27, 1973.
It is described in the specification of No. 2456.

Trim adjustment here refers to the act of setting the position of the propeller relative to the hull while traveling, and is intended to ensure that the angle of the propeller relative to the water surface is the most desirable angle for increasing speed or from a safety standpoint. It is something that is done. This patent also shows that a forward vibration isolation support is positioned between the screw jack and the engine. The present invention improves on the device described in this patent.

In the device described in this U.S. patent specification, the trim adjustment of the stern drive is performed by extending and retracting a screw jack, thereby raising and lowering the front part of the stern drive that can swing around the aft part. , where the screw jack is each provided with a device for pivotally coupling the upper end of the jack to the stern drive and a device for pivotally coupling the lower end of the jack to the hull. The purpose of the present invention is to
In view of the relative expense of such a pivotable coupling device, it has been proposed to enable rocking for trim adjustment of the stern drive without the use of such a pivotably coupling device. That's true. The stern drive device of the present invention includes an engine, a lower unit fixed to the rear of the engine, capable of vertically movable and horizontally swingable separately from the engine, and further supporting a propeller. a propulsion unit having a Z pivot axis connected to the engine aft of the front of the engine for vibrationally isolating and supporting the engine from the hull and for allowing the engine to tilt relative to the hull; an aft support device of elastomeric material provided forward of the aft support device for tilting the engine about the aft support device relative to the hull and further vibration-isolating and supporting the engine from the hull; It has a configuration including two front support devices.

The forward support device includes a part made of elastomeric material, a bracket fixed to the elastomeric part and adapted to be fixed to the hull, an arm fixed to the elastomeric part apart from the bracket, and an engine. and a jack mechanism fixed to the arm and tilting the engine relative to the hull. Before describing the present invention in detail, it is to be understood that the present invention is not limited to the details of construction and arrangement of parts described below or shown in the drawings.

The invention is capable of other various embodiments. Also,
It is also to be understood that the terms used are intended to be descriptive and not limiting. FIG. 1 shows a stern drive device 11 mounted at the rear of a hull 13. As shown in FIG.

The stern drive unit 11 includes an engine 15 and a propulsion unit 17 connected to the engine 15 and capable of vertically movable relative to the engine and horizontally swingable, that is, steerable.
It includes. The propulsion unit 17 has a leg section or lower unit 1 having a shaft 20 supporting a propeller.
It includes 9. Although any suitable engine configuration may be used, in the illustrated configuration, engine 15 includes a V-shaped block member with a downwardly facing apex. The engine 15 is mounted at the rear on each side of the hull via rear supports 23 made of elastomeric material made of rubber or other elastic material, the rear supports 23 being one
No. 3722, granted March 27, 973.
It is described in detail in the specification of No. 456.

As described in this U.S. patent, the rubber aft support device 23 provides vibration isolation and support for the engine and trims the engine by zeroing and tilting the generally horizontal pivot axis relative to the hull 13. adjustment, that is, the inclination of the stern drive 11 is finely adjusted to facilitate positioning of the propeller at a desired angle with respect to the horizontal. 5
The stern drive of the present invention also includes a front support device for supporting the engine 15 from the hull 13 forward of the elastomer rear support device 23, which forward support device supports the engine 15 from the hull 13. Displace the stern drive device 11 relative to the support device, thereby moving the stern drive device 11 to the aft support device 23.
It includes a hydraulically actuated device or jack mechanism 61 for tilting and trimming around the center.

More particularly, in the illustrated construction, such forward support devices are positioned near the intermediate portion of the engine 15 and each of the engines 15, as shown in detail in FIGS. A bracket 25 fixed to the hull 13 on the side of the ship by one or more bolts 27 and having upper and lower spaced parts 029, 31 each having an aligned hole 33; It includes.

An arm 35 extends in the space between the upper and lower parts 29 and 31 of each bracket 25, and this arm 35
includes a support part 37 having an aperture 39 through which extends a part or support 41 of elastomeric material in the form of a mass of rubber or other elastic material;
1 continuously engages the hole 39 and the upper and lower edge surfaces of the hole 39 of the support portion 37 of the arm.

The support 41 is a sleeve 43 having a thread on its inner surface 0.
The clamping plates 45 and 47 are joined to the support part 37 of the arm by upper and lower clamping plates 45 and 47, respectively. connected to each other by bolts. If desired, support 41 and sleeve 43
It can also be formed from two parts so as to be inserted into the hole 39 from the top and bottom ends of the hole 39. Each arm 35 and a support 4 made of elastomeric material attached to it
1 is a sleeve 43 and a nut 55 that pass through holes provided in the upper and lower parts 29, 31 of the bracket and enlarged holes 53 provided in the attachment plates 45, 47 spaced apart from these parts.
The arm 35 is secured to the bracket 25 by means of a bolt 51 extending therethrough, thereby stiffening the bracket 25, the bolt 51 and the sleeve 43, and the elasticity of the support 41 made of elastomeric material to secure the arm 35 relative to the bracket 25.
allow them to move freely.

The arms 35 which are spaced apart in the lateral direction are the lateral restraint rods 57.
are firmly connected to each other.

If desired, arm 35 and stay rod 57 can be manufactured in one piece. The arms 35 (or stay rods 57) are connected to respective pistons 59 of a pair of laterally spaced hydraulic cylinder/piston assemblies or jack mechanisms 61 mounted on each side of the engine 15, respectively. . More specifically, on each side of the engine 15, a cylinder housing 63 is provided with a pair of vertically extending bolts 65 spaced apart from each other and extends upwardly from the engine 15. It is fixed to the engine 15 by a set screw 67 extending at an angle of about 45 degrees toward the center plane of the engine. Cylinder housing 6
3 each include a vertically oriented and downwardly open cylinder 69 which houses a piston 71 connected to one of the piston pipes 59 . The bottom of the sill 69 is closed by a perforated end cap 73 through which the piston rod 59 extends. Thus, applying fluid pressure above or below piston 71 in cylinder 69 causes cylinder housing 63 to rise or fall relative to piston 71, thereby raising or lowering engine 15 to drive the stern. The device is tilted about the rear support device 23 made of elastomeric material. Any suitable device may be provided for selectively supplying hydraulic fluid to opposite ends of cylinder 69.

In the illustrated construction, such a device consists of parallel conduits, i.e. ducts 83,
Through 85 the reservoir, i.e. the sump 87 and the cavity 89 of the spool valve are connected. It consists of an electrically driven reversible pump 81. On the other hand, the left end of the spool valve cavity 83 is connected to the upper end of the cylinder 69 via a spring loaded check valve 91 and a conduit 93. The other end of the spool valve cavity 83 is connected to the lower end of the cylinder 69 via a spring loaded check valve 95 and a conduit 97. According to the invention, a device is also provided for indicating the trim position of the stern drive 11.

Although a variety of constructions may be utilized, in the construction shown, such a device (FIG. 4) is, for example, sensitive to applied voltage and arranged to change the resistance of resistor 105 as engine 15 tilts. A gauge or meter 101 is connected to a suitable constant voltage source, such as a battery 103, which is connected to a variable resistor 105.
More specifically, in a preferred construction, variable resistor 10
5 is the housing 1 attached to the cylinder housing 63
vertically extending coil 107 fixed within 09;
and the lower end of the arm 3 is fixed by a suitable device such as a screw 113.
5 and extends upwardly into the resistor housing 109 and moves guided within this housing so as to variably engage the coil 107 depending on the position of the engine 15 relative to the arm 35. , that is, a slide member 111 is provided. Slide member 111 is electrically connected to engine block member 21 by wire 115 or other suitable device to complete the electrical circuit.

Although it is preferred to use a jacking mechanism consisting of a dual cylinder and piston assembly as shown connected at both ends to a stay 57 supported on supports 41 of elastomeric material, the present invention also A single hydraulic cylinder/piston connected between 15 and one or more elastomeric supports 41 supported on the hull 13 is also applicable.

In the structure shown, in which the engine 15 includes a V-shaped block section 21 with its apex pointing downwards, a rear support device 23 made of elastomeric material and a support body 41 are required in order to isolate vibrations as much as possible. Preferably, all are located substantially in a common, substantially horizontal plane 121 (FIG. 1).

In operation, by supplying pressure fluid to the top of the cylinder 69 (and discharging pressure fluid from the bottom of the cylinder 69) and raising the front end of the engine 15, the stern drive 11 is moved to the rear support device made of elastomeric material. 23 in a clockwise direction. Supplying pressure fluid to the bottom of the cylinder 69 (and discharging pressure fluid from the top of the cylinder 69) pulls down the front end of the engine 15, thus causing the stern drive 11 to rebound about the aft support 23 made of elastomeric material. Tilt clockwise. At the same time, the aft support device 23 and the support 41 insulate the hull 13 from engine vibrations. Thus, in the present invention, even though the jack mechanism or hydraulic cylinder piston assembly 61 is fixed to the engine 15 and the arm 35, the elastomeric support 41
A hydraulic cylinder is required when the engine 15 swings due to the deformation of the cylinder. Oscillation of the piston assembly is allowed, thus reducing cost by eliminating the need to pivot the ends of the hydraulic cylinder piston assembly as in the prior art.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of a ship equipped with a stern drive device having various features of the present invention, FIG. 2 is a sectional view showing the jacking mechanism of the stern drive device of FIG. 1, and FIG. The figure is an enlarged sectional view of a part of the stern drive shown in Figure 1,
The figure is a partial sectional view taken approximately along line 4-4 in FIG. 3. 1... Stern drive device, 13... Hull,
15... Engine, 19... Lower unit, 21... 1 engine block, 23... Rear support device, 26... Placket, 35... Arm, 41... ... Parts made of elastomer material, 61... Jack mechanism. Ebishio Ensura 4 Takara” Takara 2

Claims (1)

[Claims] 1 an engine; a propulsion unit fixed to the rear of the engine, capable of vertically tilting and horizontally swinging separately from the engine, and further having a lower unit supporting a propeller; an aft support device of elastomeric material connected to the engine aft of the forepart of the ship and providing a pivot axis for vibrationally isolating and supporting the engine from the hull and allowing the engine to tilt relative to the hull; and a forward support device located forward of the aft support device for tilting the engine around the aft support device relative to the hull and further vibration-isolating and supporting the engine from the hull. A stern drive, in which the forward support device comprises an elastomeric part, a bracket fixed to the elastomeric part and adapted to be fixed to the hull, and a stern drive including a elastomeric part separated from the bracket. A stern drive device comprising: an arm fixed to the engine; and a jacking mechanism fixed to the engine and arm for tilting the engine relative to the hull.