JPH0537692U - Power tilt device for outboard motors - Google Patents

Abstract

(57) [Summary] [Objective] To improve an outboard motor power tilt device and power trim and tilt device. When lowering the outboard motor main body from the highest tilted state, movement of the center of gravity causes variations and unevenness in the descending speed of the tilt cylinder, and the power with the tilt cylinder and trim cylinder arranged side by side. -The trim and tilt device improves that the trim cylinder (piston angle) is difficult to set because the piston of the trim cylinder lowers quickly. [Structure] A spring elastic body is provided between the piston and the cylinder lid through which the piston rod of the tilt cylinder penetrates.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a power tilt device and a power trim and tilt device for an outboard motor.

[0002]

[Prior art]

 FIG. 3 shows the structure of the end of the conventional hydraulic cylinder for a power device on the side where the piston rod penetrates. From cylinder 1, piston 2 ', piston rod 3, and cylinder lid 4 having a through hole and a seal (oil seal, O-ring, etc.) for preventing the working fluid in the cylinder from leaking. Become. As shown in this figure, when the outboard motor body is lifted and the piston 2'moves upwards fully, the piston 2'and the cylinder lid 4 come into contact with each other.

[0003]

[Problems to be solved by the device]

 As shown in Fig. 3, when the outboard motor main body is lifted up, the center of gravity of the heavy outboard motor main body changes at the top, and the force applied to the piston rod (the force that pushes down the piston) becomes smaller. Variations and unevenness occur, making it difficult to move up and down. Especially when it goes down, that is, when the piston rod of the tilt cylinder retracts. If the tilt cylinder and the trim cylinder are installed in parallel, they are driven by the same hydraulic pump.If the tilt rod piston rod does not return properly, the trim cylinder will return to the bottom first. It is difficult to position the outboard motor body by lowering it from the top and stopping it at the angle when sailing.

Conventionally, in order to solve these problems, the rod diameter of the tilt cylinder and the trim cylinder is changed, the piston pressure receiving area at the time of starting the descent is changed, and the return side circuit of the working fluid in the cylinder is narrowed down. Was provided to smooth the cylinder operation. However, these were the causes of complicated structures and increased costs.

[0005]

[Means for solving problems]

 In the present invention, a spring elastic body (for example, a disc spring) is provided between the piston and the cylinder lid through which the piston rod of the tilt cylinder penetrates, without using the prior art.

[0006]

[Action]

 As described above, the force of pushing down the piston due to its own weight becomes small near the uppermost end of the outboard motor body, especially when it descends, but by inserting a spring elastic body, the force of pushing down the piston lot can be supplemented. For example, with a disc spring, even a small stroke can store a large spring force. The structure is simple.

[0007]

【Example】

 FIG. 3 shows an example of a conventional cylinder, and FIG. 1 shows an embodiment of the present invention. Referring to FIG. 1, 1 is a cylinder, 2 is a piston, 3 is a rod, 4 is a cylinder lid, 5 is a hydraulic oil inlet / outlet hole, 6 is a hydraulic oil inlet / outlet hole, 7, 8 and 9 are O-rings, Reference numeral 10 is an oil seal, and 11 is a disc spring.

When the outboard motor descends, the hydraulic oil flows in with pressure from the inflow / outflow hole 5, the hydraulic oil on the back side of the piston 2 ′ flows out from the inflow / outflow hole 6, and the piston moves down to the position of the piston 2. The structure is such that the outboard motor is in a descending state. On the contrary, when the outboard motor rises, the working oil with pressure flows in from the inflow / outflow hole 6 and pushes up the piston, and the working oil above the piston flows out from the inflow / outflow hole 5 until the piston reaches the 2'position. come. At this time, the outboard motor is in the ascending state.

At the moment when the piston starts descending from the ascending state of 2 ′, the hydraulic oil flows in through the inflow / outflow hole 5, enters the stepped portion 12 provided on the cylinder lid, and this stepped portion and the cylinder lid The portion corresponding to the diameter ratio of 4 becomes the pressure receiving area, and the force for pushing down the viston 2'is generated. As shown by the dotted line in Fig. 2, when the outboard motor is in the highest ascending position, the head part where the engine is mounted is located on the left side of the figure. It becomes smaller, and depending on the model, it has the force to pull the piston further up.

Due to the position of the center of gravity of the outboard motor, the force exerted on the rod 3 is the force applied to the upper side of the piston 2 ′ to lower the outboard motor in the direction of the arrow 13 or when the piston is pulled further up. Requires an extra force equivalent to this, and there is a time delay from the start of hydraulic oil inflow to the start of piston lowering. In this case, when there is a trim cylinder alongside this tilt cylinder, the hydraulic oil sent from the same hydraulic pump flows to the trim cylinder with low resistance, so that the tilt cylinder does not lower, but only the trim cylinder lowers to the lowest end.

In the present invention, a disc spring 13 is inserted between the piston 2 ′ and the cylinder lid 4 in order to reduce this time delay. When the piston is raised, the piston 2 ', the disc spring 13 and the cylinder lid 4 are in close contact with each other. When the pressure of the hydraulic oil on the lower side of the piston becomes 0 at the start of lowering, first the piston 2'is slightly lowered by the spring force of the disc spring 13, and hydraulic oil having hydraulic pressure enters the gap 5 through this gap. , The pressure receiving area of the piston is fully expanded, and the piston can be lowered easily. The disc spring can produce a large spring force in spite of the small stroke, and thus has a great effect.

[0012]

[Effect of the device]

 According to the present invention, the outboard motor main body can be smoothly lowered from the uppermost position with an inexpensive and simple structure in which the disc spring is inserted above the piston. In the case of the power trim and tilt device, only the trim cylinder is prevented from descending first, and it is easier to lower the trim cylinder to position the outboard motor main body at the angle when sailing.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a tilt binder according to an embodiment of the present invention.

FIG. 2 is a side view of the outboard motor attached to a boat, showing a cruising state and a state of being lifted to the uppermost position.

FIG. 3 shows a partial sectional view of a conventional tilt cylinder.

[Explanation of symbols]

 1 Tilt cylinder 2 Piston (when the outboard motor is descending) 2'Piston (when the outboard motor is moving up and down) 3 Piston lot 4 Cylinder lid 11 Disc spring 20 Outboard motor body (when descending (running state)) 20 'Outboard motor Body (when rising) 30 Trim cylinder

Claims (2)

[Scope of utility model registration request] 1. A hydraulic cylinder driven by a hydraulic pump is provided between a stern bracket fixed to a stern plate and a swivel bracket rotatably supported by the stern bracket via a tilt shaft. The piston power rod is slidably pierced so that the working fluid inside the cylinder does not leak, and a spring elastic body is mounted between the piston and the power of the outboard motor.
Tilt device. 2. A power trim and tilt device for an outboard motor, which is a combination of the power tilt device according to claim 1 and a power trim cylinder.