JP2883982B2 - Tilt device for marine propulsion - Google Patents

Description

Description: BACKGROUND OF THE INVENTION (Industrial application field) The present invention relates to a tilting device that rotates a propulsion unit mounted on a rear end of a hull up and down in a marine propulsion device.

(Prior Art and Problems Thereof) Generally, a marine propulsion device is provided with a tilt device that rotates the propulsion unit up and down to tilt the propulsion unit up or down.

FIG. 7 is a partial longitudinal sectional view showing a marine propulsion device provided with a conventional tilt device. At the rear end of the hull 1 is mounted a transom plate 2 having a shape depressed inboard. A support portion 3 is provided on the transom plate 2, and a front end of an upper portion of the propulsion unit 4 is attached to the support portion 3. The support portion 3 includes a support shaft 5 extending in the left-right direction (the hull width direction), and a support shaft (swivel bracket) 6 extending in a substantially vertical direction, which is rotatable up and down with the support shaft 5 as a fulcrum. The unit 4 is mounted so as to be rotatable up and down, left and right around these support shafts 5 and 6. A tilt device 8 is accommodated in the recess of the transom plate 2 and in a case 7 connected to the recess and attached to the front side of the transom plate 2.

The cylinder 11 of the tilt device 8 has a protrusion 11a on the front end surface.
A horizontal pin 12 on the support 7a that closes the front side of the case 7.
And are rotatable up and down with the pin 12 as a fulcrum. Hydraulic pipes 13 and 14 that supply hydraulic pressure to the upper chamber and the lower chamber in the cylinder 11, respectively,
One end of each of the hydraulic hoses 13a and 14a is connected to the cylinder 11 via joints 13b and 14b, and extends upward together as shown in FIG. 8, which is a sectional view taken along the line VIII-VIII of FIG. It is configured to communicate with a pump unit (not shown) in the ship via 13c, 13d, 14c, 14d. The piston 15 has a rod 15a at the rear end connected to and supported by a horizontal pin 16 on a support 6a attached to the front side of the support shaft 6, and is rotatable up and down around the pin 16 as a fulcrum. . Reference numeral 17 denotes an input shaft for transmitting power to the propulsion unit 4, and reference numeral 18 denotes a coupling for connecting the input shaft 17 to an output shaft (not shown) of an engine installed in the ship. The dashed line A
Indicates the center line of the cylinder 11 when the propulsion unit 4 is rotated up and down around the support shaft 5 together with the support shaft 6 by the tilt device 8, that is, when the tilt unit is tilted up. Is L1.

However, the marine propulsion device using the tilt device 8 has the following problems.

(1) Hydraulic hoses 13a, 14a and fittings 13b, 13c, 13d, 14
Since b, 14c, and 14d are provided on the outboard side, a material that has corrosion resistance to seawater must be used for this, which increases the cost, and the joint 13b that becomes loose with operation
In order to carry out such maintenance, it is necessary to disassemble and disassemble the marine propulsion unit on land, which is difficult.

(2) Since the cylinder 11 is supported by the protruding portion 11a formed on the front side of the stroke volume, the case 7 and the support 7a protrude forward by that amount, so that the case 7 and the support 7a do not hit against it. The coupling 18 is the input shaft
It is located forward with 17 and therefore the engine is located forward, which reduces the space on board. Here, the reason why the coupling 18 must be disposed at the front is as follows. The coupling 18 needs a predetermined size in order to reliably transmit the power from the engine to the input shaft 17, and cannot be excessively reduced. At the bottom of the ship, a predetermined space is required for attaching the transom plate 2 to the hull 1 via the seal 2a in a liquid-tight manner.
The lower wall 7c cannot be lowered unnecessarily. Case 7
The upper and lower spaces need to be large enough to prevent the cylinder 11 from rotating.

(Object of the Invention) The present invention can easily perform maintenance of a joint of a hydraulic pipe, can improve the reliability of the device, can reduce the cost of the hydraulic pipe,
In addition, it is an object of the present invention to provide a tilting device for a marine propulsion device in which an engine is arranged as much as possible rearward in a ship so that a large space inside the ship can be secured.

(Constitution of the Invention) In the present invention, a propulsion unit is attached to a case member which has a shape depressed inside a ship and is attached to a rear end of a hull and separates the inside and outside of a ship so as to be rotatable vertically and horizontally. In a tilt device for moving a piston in a cylinder back and forth by hydraulic pressure transmitted through a hydraulic pipe which is housed in the recess of the case member in the front-rear direction and which is transmitted through a hydraulic pipe of the marine propulsion device, the propulsion unit rotates up and down. Each of the left and right side walls of the case member can be rotated horizontally and about the horizontal axis in the left and right direction with respect to each of the left and right side walls of each of the opposing parts on the left and right sides and located within the range of the cylinder stroke. The two hydraulic shafts penetrating in a liquid-tight manner are fixed to each other, and the two hydraulic pipes on the inside of the ship are connected through one of the rotary shafts or one by one through each of the rotary shafts. In the room One hydraulic pipe communicates with the upper chamber or the lower chamber in the cylinder via a hydraulic passage formed in the cylinder thickness, and the other hydraulic pipe communicates directly or with a hydraulic passage formed in the cylinder thickness. A tilting device for a marine propulsion device, characterized in that the tilting device communicates with a lower chamber or an upper chamber in a cylinder via a cylinder, and further has a rotation shaft fixed to a front end side of the cylinder.

(Operation) The hydraulic oil of the tilt device is supplied into the cylinder through the hydraulic piping on the inside of the ship, through the rotating shaft, and into the cylinder. Therefore, there is no need to provide a hydraulic pipe on the outboard side. The cylinder is supported by the left and right rotating shafts, and rotates up and down with the rotating shaft as a fulcrum.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. First
The figure is a partial longitudinal sectional view showing a marine propulsion device using the tilt device of the present invention, and the same reference numerals as those in FIG. 7 denote the same parts.
20 is a tilt device of the present invention. Fig. 2 is II- of Fig. 1.
FIG. 2 is a cross-sectional view taken along the line II, which shows a structure of a supporting portion of the tilt device 20 with respect to the case 7. The tilt device 20 includes a cylinder 21, a piston 22, two hydraulic pipes 23, 24, and two rotary shaft portions 25, 26. The rotating shaft portions 25 and 26 are members that support the cylinder 21 on the case 7. The piston 22 is similar to the conventional piston 15 shown in FIG.
22a is connected to the support 6a by a horizontal pin 27, and is rotatable up and down around the pin 27 as a fulcrum. The inside of the boat and the outside of the boat are separated by the transom plate 2 and the case 7, and the cylinder 21 and the piston 22 are accommodated in the recess of the transom plate 2 and inside the case 7, that is, outside the boat in the front-rear direction.

FIG. 3 is a side view showing the cylinder 21 and the piston 22, and FIG. 4 is a sectional view taken along line IV-IV of FIG. As shown in FIG. 4, receiving portions 31 and 32 to which the rotating shaft portions 25 and 26 are respectively fixed are formed at opposing positions of the front end portions on the left and right sides of the cylinder 21. Each of the receiving portions 31 and 32 is a projecting portion having a substantially quadrangular vertical cross section projecting rightward and leftward, and has vertical ends 31a and 32a. Four bolt holes 33 are formed in the vertical surfaces 31a and 32a at right angles to the vertical surfaces 31a and 32a, respectively.
The bolt holes 33 are evenly located on a diagonal line. The vertical surfaces 31a and 32a are formed with cylindrical holes 31b and 32b at right angles in the center thereof. The hole 31b communicates with one end of the hydraulic passage 40 at the bottom thereof. The hydraulic passage 40 is formed to extend in the front-rear direction in the right peripheral wall of the cylinder 21, and the other end thereof communicates with the upper chamber 21 a in the cylinder 21. On the other hand, the hole 32b is further provided with a hole 32b '
Is in direct communication with

As shown in FIG. 2, the receiving portions 31 and 32 have rotating shaft portions 25 and 26, respectively.
Is formed in the case 7 at a position facing the receiving portions 31 and 32.
a and 7b are horizontally penetrated and fixed by four bolts 34, respectively. Hereinafter, the configuration of the rotating shaft portion 25 will be described with reference to FIG. 2, but the rotating shaft portion 26 has the same configuration. The rotating shaft portion 25 is a member having a cylindrical main body 25a formed with a cylindrical protruding portion 25b at the cylinder 21 side, that is, at the center of the end surface on the outboard side, and a flange 25c formed on the inboard side. Body 2
5a is substantially the same as the length of one side of the square of the receiving portion 31 and has a diameter slightly smaller than the diameter of the hole 7a.
It is slightly longer than the thickness of the part. Projection 25b
Has the same diameter as the diameter of the hole 31b, and has the same projection length as the depth of the hole 31b. The diameter of the flange 25c is slightly larger than the diameter of the hole 7a. The rotary shaft 25 has a through hole 25d formed at the center of the shaft.

The rotating shaft 25 has a protrusion 25b fitted into the hole 31b via an “O” ring 35b, and the surface 25 of the main body 25a on the cylinder 21 side.
a 'comes into contact with the vertical surface 31a, and the receiving portion 31 is
It is fixed to. The main body 25a is an “O” ring 3 from the outboard side
5a, through a hole 7a via a slide bearing 36 and a seal 37. Therefore, the rotating shaft portion 25 is rotatable around the horizontal axis in the left-right direction with respect to the case 7 while penetrating the case 7, and furthermore, separates the outboard and the inboard with the case 7 in a liquid-tight manner. It has become. Reference numeral 38 denotes a grease nipple for supplying a lubricant to the peripheral surface of the main body 25a.

One end of a joint 23b bent at a right angle is screwed into the outboard side of the through hole 25d, and one end of a hydraulic hose 23a is connected to the other end of the joint 23b via a cap nut 23c. . As a result, the hydraulic hose 23a is connected to the joint 23b and the through hole 25.
d, The hydraulic hose 24a is connected to the upper chamber 21a of the cylinder 21 via the hydraulic passage 40, and the hydraulic hose 24a connected to the rotary shaft 26 in the same manner as the rotary shaft 25 communicates with the lower chamber 21b of the cylinder 21. 24b is the same joint as the joint 23b. The other ends of the hydraulic hoses 23a and 24a are connected to a pump unit (not shown) arranged in the ship.

Next, the operation of the tilt device 20 will be described. When hydraulic oil is supplied from the pump unit via the hydraulic piping 24, the lower chamber 21b is filled with hydraulic oil, and the piston 22 receives the oil pressure at the piston receiving portion 22b (FIG. 4) and moves backward. . And the piston 22 pivots downward with the pin 27 as a fulcrum,
The cylinder 21 rotates upward with the rotation shafts 25 and 26 as fulcrums, and the support shaft 6 and the propulsion unit 4 are pushed rearward by the piston 22 and rotate upward with the support shaft 5 as a fulcrum. That is, the propulsion unit 4 is tilted up. The dashed line B (first
Figure) shows the center line of the cylinder 21 when the propulsion unit 4 is tilted up, and the distance between the center line B and the support shaft 5 is
L2. Conversely, when hydraulic oil is supplied from the pump unit via the hydraulic piping 23, the upper chamber 21a is filled with hydraulic oil, and the piston 22 moves forward. Then, the piston 22 and the cylinder 21 move in the opposite direction to the above, and the propulsion unit 4
Returns to its original state. That is, it is tilted down.

In such a marine propulsion device using the tilt device 20, the hydraulic pipes 23 and 24 for supplying the hydraulic oil into the cylinder 21 are provided on the inner side of the ship. There is no need to use. In addition, since the hydraulic piping outside the boat as in the conventional example (FIG. 7) is not required, the material can be saved correspondingly. Therefore, the cost required for hydraulic piping is reduced. Further, since the joints 23b and 24b are located on the inside of the ship, it is not necessary to disassemble and disassemble the marine propulsion unit by land, as in the conventional example, and the maintenance becomes easy.

Further, in this marine propulsion device, the cylinder 7 is supported by the case 7 at the front end portions on both the left and right sides by the rotating shaft portions 25 and 26. Therefore, the front surface 7b of the case 7 has at least the projection length of the projection 11a of the conventional example. It is formed so as to be located just behind. Further, since the hydraulic piping 13 and 14 on the outboard side as in the conventional example are eliminated, the cylinder 21 is disposed closer to the lower wall 7c of the case 7 than in the conventional example, and the case 7
7d is formed in a shape close to the cylinder 21. However, here, the upper wall 7d is close to the portion facing the front end of the cylinder 21 so as not to hinder the rotation of the cylinder 21 to the tilt-up state. The coupling 18 is arranged above the upper wall 7d of the case 7 facing the front end of the cylinder 21. Thus, the coupling 18 is connected to the input shaft 17
, The engine in the ship is arranged rearward by that much, so that the space inside the ship is ensured by that much.

Further, since the cylinder 21 is supported on the case 7 by the rotating shaft portions 25 and 26 on both the left and right sides, the center line B of the cylinder 21 and the support shaft 5 when the propulsion unit 4 is tilted up to the same height as the conventional example. The distance L2 is slightly longer than L1 of the conventional example. The support of the propulsion unit 4 involves a moment about the support shaft 5 as a fulcrum. Therefore, when L2> L1, the propulsion unit 4 is more reliably supported by the same force as in the conventional example, or the propulsion unit 4 can be supported by a smaller force than in the conventional example, and the tilt device 20 is small in size. It can be made into.

Further, since the rotating shaft portions 25 and 26 are provided at the front end of the cylinder 21, the front side of the cylinder 21 does not rotate downward. Therefore, the lower wall 7c of the case 7 and the transom plate 2
It is not necessary to deform the lower wall so as to lower the lower wall, and the production is not difficult.

(Effects of the Invention) As described above, according to the present invention, the left and right side walls of the case 7 are horizontally placed on the receiving portions 31 and 32 located opposite to the left and right front ends of the cylinder 21 with respect to each wall. The rotating shaft portions 25 and 26, which penetrate in a liquid-tight manner so as to be rotatable around the horizontal axis in the left-right direction, are fixed to each other. Upper chamber 21a in cylinder 21
And the hydraulic pipe 24 on the inboard side is communicated with the lower chamber 21b in the cylinder 21 via the rotating shaft 26. (1) Outboard hydraulic pressure for supplying hydraulic oil to the tilt device Piping is not required. Therefore, it is not necessary to use a material having corrosion resistance to seawater for the hydraulic piping, and it is possible to save the material provided outside the ship and reduce the cost required for the hydraulic piping.

(2) Since the joints 23b and 24b of the hydraulic pipes 23 and 24 are located on the inner side of the ship, it is not necessary to disassemble and disassemble the marine propulsion unit by land, as in the conventional example. As a result, the reliability of the tilt device 20 can be improved.

(3) The cylinder 21 can be arranged closer to the lower wall 7c of the case 7 than in the conventional example.
Since the coupling 18 can be formed in a shape closer to the conventional example, the coupling 18 can be arranged on the case 7 and arranged rearward together with the input shaft 17, and the engine in the ship can be arranged rearward by that much. And the space inside the ship can be assured.

(4) The distance L2 between the center line B of the cylinder 21 and the support shaft 5 when the propulsion unit 4 is tilted up to the same height as the conventional example.
Is slightly longer than L1 of the conventional example, so that the propulsion unit 4 can be more reliably supported with the same force as the conventional example, or the propulsion unit 4 can be supported with less force than the conventional example, The device 20 can be reduced in size.

(5) If it is sufficient to secure the same space as in the prior art shown in FIGS. 7 and 8, the entire length of the cylinder 21 can be increased by the length of the protrusion 11a. The stroke can be increased accordingly, and the tilt angle can be increased accordingly.

(Another embodiment) (1) The position where the rotating shaft portions 25 and 26 are provided is not limited to the front end of the cylinder 21. For example, as shown in FIG. 5, it may be provided at the center of the cylinder 21 in the front-rear direction. According to this, the cylinder 21 when the propulsion unit 4 is tilted up
Is shown as a dashed-dotted line C in the figure, and the distance L3 between the centerline C and the support shaft 5 is longer than L2 in the case of the above embodiment. The tilt device 20 can be more reliably supported, or the tilt device 20 can be reduced in size.

(2) The two hydraulic pipes 23 and 24 may be connected to the upper and lower chambers of the cylinder via only one of the two rotating shafts. This is, for example, the rotation shaft 50 shown in FIG.
May be used. FIG. 6 is a view corresponding to the section taken along line VI-VI of FIG. The rotating shaft 50 has two protrusions 51 and 52 corresponding to the protrusion 25b of the rotating shaft 25, and through holes 53 and 54 corresponding to the through hole 25d. A hole 61 corresponding to the hole 31b of the portion 31 and a hole 62 corresponding to the hole 32b of the receiving portion 32 are formed. The protrusion 51 is fitted into the hole 61, the protrusion 52 is fitted into the hole 62, and the hydraulic pipes 23 and 24 are respectively provided with through holes 53,
54 is screwed. According to this, since the maintenance of the joints of the hydraulic pipes 23 and 24 can be performed from only one side, the maintenance can be performed more easily than in the above embodiment. Further, since it is not necessary to secure a space for disposing the hydraulic pipe on the other side, it is possible to secure a wider space in the ship as compared with the above embodiment.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view showing a marine propulsion device using the tilt device of the present invention, FIG. 2 is a II-II sectional view of FIG. 1, and FIG. 3 is a cylinder and piston of the tilt device of the present invention. FIG. 4 is a sectional view taken along the line IV-IV of FIG. 3, FIG. 5 is a longitudinal sectional view showing another embodiment of the tilt device of the present invention, and FIG. 6 is another view of the tilt device of the present invention. FIG. 7 is a partial longitudinal sectional view showing a conventional marine propulsion device using a tilting device, and FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 1 ... hull, 2 ... transom plate, 4 ...
Propulsion unit, 7 Case, 20 Tilt device, 21
... Cylinder, 22 ... Piston, 23, 24 ... Hydraulic piping, 2
5, 26 ... Rotary shaft

Claims (1)

(57) [Claims] 1. A propulsion unit for a marine vessel, wherein a propulsion unit is mounted on a case member having a shape depressed inboard and mounted on a rear end portion of the hull and separating the inside and outside of the boat so as to be rotatable vertically and horizontally. A tilt device that is housed in the front and rear direction in the recess of the case member and moves the piston in the cylinder back and forth by hydraulic pressure transmitted through a hydraulic pipe to rotate the propulsion unit up and down. To each of the portions located within the range of the cylinder stroke, the left and right side walls of the case member are liquid-tight so as to be rotatable horizontally and about a horizontal axis in the left and right direction with respect to each wall. The two hydraulic shafts penetrating through each other are fixed to each other, and the two hydraulic pipes on the inside of the ship are communicated with the chamber in the cylinder through one of the rotary shafts or one by one through each of the rotary shafts. ,one The other hydraulic pipe communicates with the upper or lower chamber in the cylinder through a hydraulic passage formed in the cylinder thickness, and the other hydraulic pipe directly or through a hydraulic passage formed in the cylinder thickness. A tilting device for a marine propulsion device, wherein the tilting device communicates with a lower chamber or an upper chamber in the vehicle.