JPS6140638Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an outdrive hydraulic lifting device mainly used in small boats.

By the way, the outdrive used when driving a propeller with an engine installed inside a ship is
The main body is supported by a support member installed on the outside of the stern section so as to be able to swing up and down, and also by providing a universal joint on the input shaft that introduces power from the engine to the main body. The main body can be moved left and right when steering, and can also be raised rearward and upward when navigating in shallow waters or when not in use. However, this lifting operation is performed manually or hydraulically, but manual operations are cumbersome, the lifting angle cannot be set arbitrarily, and the main body is underwater in the normal navigation position. If the main body is made swingable so that it can escape backwards and upwards when it comes into contact with an obstacle, it has the disadvantage that the main body will jump up by itself due to the thrust of the propeller when switching to reverse. However, if the vehicle was made to be able to swing backwards and upwards relative to an obstacle, the main body would not return to its original position after passing the obstacle, and it would jump up on its own when traveling backwards.

The present invention was developed in view of the above circumstances, and is equipped with a hydraulic cylinder for lifting the outdrive main body, and has a lifting system that has neutral, ascending, and descending positions on the hydraulic circuit from the pump to the cylinder. A switching valve is installed in the bottom circuit downstream of the switching valve, and a valve is installed in the bottom circuit downstream of the switching valve to prevent the flow of hydraulic oil from the bottom oil chamber of the cylinder, except when the switching valve is in the lowered position. Equipped with a check valve that is kept closed when negative pressure is applied, and a fixed check valve that prevents hydraulic oil from flowing out from the cylinder rod side oil chamber can be inserted or removed in the rod side circuit. By equipping the outdrive body with a After passing, the main body can be returned to the original setting position, and when moving backward, a fixing check valve is installed in the rod side circuit to prevent the main body from jumping up by itself. .

This will be explained below using an example shown in the figure.
In FIG. 1, 1 is the stern of the ship, 2 is an outdrive installed in the stern, and a propeller 4 at the bottom of the main body 3 is driven by a shaft 5 and the main body by an engine (not shown) installed inside the ship. It is designed to be driven via a transmission mechanism inside the machine. Reference numeral 6 denotes a pair of left and right brackets protruding from the outer surface of the stern section 1, 7 a support member pivotably attached to the brackets at the upper ends of both left and right sides, and the outdrive main body 3 is attached to the middle part of the members. The main body is supported by a pin 8 through a pin 8, so that the main body can be swung left and right about the pin by means of a steering lever 9, and also about a pivot point X between the bracket 6 and the support member 7. It is made possible to swing up and down integrally with the member. Here, the shaft 5 is provided with a universal joint as a bellows 10. 11
is a hydraulic cylinder that swings the outdrive main body 3 up and down, and one end is pivotally connected to the hull side, and the tip of the piston rod 12 in this cylinder is pivotally connected to the support member 7, and when the rod protrudes, it is supported. The main body is made to swing rearward and upward via the member. Next, the hydraulic pressure supply circuit for the cylinder 11 will be explained with reference to FIG. 2. 13 is a pump, 14 is a discharge circuit of the pump,
15 is a relief valve installed on the circuit.
Reference numeral 16 denotes a lift switching valve that switches the direction of the circuit 14, and this valve drains the bottom side circuit 17 and rod side circuit 18, which communicate with the discharge circuit 14 and the bottom side oil chamber 11a and rod side oil chamber 11b of the cylinder 11, respectively. A neutral position 16a that connects the discharge circuit 14 to the bottom circuit 17 and a raised position 16b that connects the rod side circuit 18 to the drain circuit 19.
and connect the bottom side circuit 17 to the drain circuit 19.
It has a lowered position 16c connected to. Reference numeral 20 denotes a check valve installed on the bottom side circuit 17 that allows hydraulic oil to pass only from the pump side to the cylinder side. The check ball 20a is pressed so that it opens in response to signal pressure A from the circuit, and does not open when the negative pressure is below a certain level even if negative pressure acts on the bottom side oil chamber 11a of the cylinder. A spring 20b is attached. 21 is a fixed switching valve installed on the rod side circuit 18, and this valve has a release position 21a that directly connects the upstream and downstream sides thereof, and allows hydraulic oil to pass only from the pump side to the cylinder side on the circuit 18. It has a fixed position 21b in which a fixed check valve 21b' is interposed.

According to the above configuration, when the fixing switching valve 21 is set to the release position 21a, the lifting switching valve 1
6 from the neutral position 16a shown in FIG.
6b, the discharge pressure of the pump 13 is introduced from the discharge circuit 14 through the bottom side circuit 17 and the check valve 20 into the bottom side oil chamber 11a of the cylinder 11, thereby causing the piston rod 12 to protrude. The outdrive main body 3 shown in the figure is swung rearward and upward. Furthermore, when the switching valve 16 is switched to the lower position 16c, hydraulic pressure is introduced into the rod side oil chamber 11b of the cylinder 11 via the rod side circuit 18, and the signal pressure A from the circuit 18 causes the oil pressure to flow into the bottom side circuit 17. When the upper check valve 20 opens, the piston rod 12 is moved backward and the outdrive main body 3 is lowered. However, after the main body 3 is set to the normal position shown by the solid line in FIG. 1 or the arbitrary raised position shown by the chain line by operating the lifting switching valve 16, the switching valve 16 is returned to the neutral position 16a. In this case, the bottom side oil chamber 11a of the cylinder 11 is closed by the check valve 20 on the bottom side circuit 17, so that the main body is held at its set position. If the main body collides with an obstacle on the seabed, the main body is forcibly jumped upwards and the piston rod 12 of the cylinder 11 is pulled out, causing the bottom oil chamber 11a to become under load. In this case, the check valve 20 on the bottom side circuit 17
is held in a closed state by the spring 20b, so that after the obstacle has passed, the main body automatically closes due to the negative pressure in the bottom oil chamber 11a, the weight of the main body, the thrust of the propeller, etc. It will be returned to its original setting position. still,
In that case, the inside of the rod-side oil chamber 11b temporarily becomes negative pressure, but if a restriction 22 is provided in the drain circuit 19 as shown by the chain line in FIG.
The oil discharged from No. 3 is quickly filled into the rod side oil chamber 11b. Also, when the ship is moving backwards,
The rod side circuit 18 is opened by operating the fixing switching valve 21.
If a fixed check valve 21b' is installed in the cylinder 1,
By closing the first rod-side oil chamber 11b, the outdrive main body 3 is prevented from jumping rearward due to the thrust of the propeller 4.

Since the hydraulic lifting device for the outdrive of the present invention has the above-described configuration, it is possible to set the outdrive main body in any desired position extremely easily by operation onboard the ship, and it also allows the outdrive main body to be set at any desired position during normal navigation. The main body can escape backwards and upwards from obstacles regardless of whether the main body is in the jumping position during shallow water navigation, etc., and this prevents harmful effects such as damage to the main body, and also prevents damage to the main body. After an object has passed, the main body is automatically returned to its original setting position, allowing navigation to continue in the desired condition.Also, when going in reverse, the main body can be moved extremely easily by operating the fixing switching valve. This has the effect of preventing the main body from jumping up by itself due to the thrust of the propeller.

[Brief explanation of the drawing]

FIG. 1 is an external side view of an outdrive showing an embodiment of the present invention, and FIG. 2 is a hydraulic circuit diagram of the embodiment. 3 is an outdrive body, 11 is a hydraulic cylinder, 11a is a bottom side oil chamber, 11b is a rod side oil chamber, 12 is a piston rod, 13 is a pump, 14
1 is a discharge circuit, 16 is a lift switching valve, 16a is a neutral position, 16b is a raised position, 16c is a lowered position, 1
7 is a bottom side circuit, 18 is a rod side circuit, 20 is a check valve, and 21b' is a fixed check valve.

Claims (1)

[Scope of utility model registration request] In a configuration in which the outdrive main body is supported on the outside of the stern part so as to be able to swing up and down, a hydraulic cylinder is equipped to swing the main body upward by the protrusion of a piston rod, and a pump is installed on the hydraulic circuit leading from the pump to the cylinder. a neutral position where the discharge circuit is opened, a raised position where the discharge circuit is connected to the bottom side circuit leading to the bottom side oil chamber of the cylinder, and a lowered position where the discharge circuit is connected to the rod side circuit leading to the rod side oil chamber of the cylinder. At the same time, the bottom side circuit is equipped with a lift switching valve having a lift switch valve that prevents hydraulic oil from flowing out from the bottom oil chamber except when the lift switch valve is in the lowered position, and also prevents negative pressure in the oil chamber from flowing out. The rod side circuit is equipped with a check valve that is held in a closed state when
An outdrive hydraulic lifting device characterized in that it is removable.