JPH0356479Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a ram for a fork-type steering gear.

[Conventional technology]

Conventionally, in a marine fork-type steering gear, as shown in the plan view of FIG. 8 and the sectional view of FIG. A ram pin 4 is installed in the large diameter part of the ram pin 4 in the vertical direction, and cubic bushes 5 and 5' fitted into the upper and lower ends of the ram pin 4 form a fork-type chiller 6.
The chiller 6 is fixed to the ship's rudder shaft 7 with a key 8, and by applying hydraulic pressure to the hydraulic cylinder 1 or 1', the ram 3
moves to the left or right in the axial direction, force is transmitted from the ram pin 4 to the ram pin bushes 5, 5', and the ram pin bushes 5, 5' rotate around the ram pin 4.
The chiller 6 slides on the fork portion 6a to rotate the rudder shaft 7 clockwise or counterclockwise.

Now, to describe the detailed structure of the large diameter part at the center of the ram, the ram pin 4 is fitted onto the ram 3 with a slight clearance for convenience of disassembly, and is used to prevent the ram pin 4 from coming off and to prevent the ram pin 4 from coming off when the steering gear is in operation. The ram pin 4 is fixed to the ram 3 by a stopper bolt 9 to prevent it from rolling and seizing.
A liner 10 is inserted between the ram 3 and the chiller 6 to provide an appropriate gap to prevent interference between the ram 3 and the chiller 6, and a stopper 11 is inserted at the lower end of the ram pin 4 to prevent the lower ram pin bush 5' from falling down. A fall stopper 13 having a U-shaped cross section on a chamfered mounting surface is fixed with a bolt 14 to the front of the central large diameter part of the ram 3.
As shown in the front view, the ram 3 is prevented from rotating about its axis by sliding on a horizontal guide rod 15 supported between the hydraulic cylinders 1 and 1'.

However, the ram of this type of fork-type steering gear has the following problems.

(1) The maximum load is applied to the central large diameter part of the ram,
As shown in the cross-sectional view in Figure 11, the cross-sectional shape of this part has a chamfer for installing the fall stopper and a bolt hole for the stopper bolt, which not only reduces the effective cross-sectional area but also causes stress concentration here. This results in insufficient strength, and stress concentration occurs especially in the stopper bolt hole.

Therefore, conventionally, the diameter of the central large diameter part was smaller than the ram diameter D.
D′ is made large to compensate for the lack of strength, but this increases the outer diameter of the central large diameter part, resulting in a large shaft diameter difference, which increases the weight of the ram and when machining the ram from a round bar. A large amount of cutting work is required.

(2) At the time of installation, it is necessary to align the bolt set hole of the ram pin 4 with the stopper bolt 9, and since the inside cannot be seen, it takes a considerable amount of time to align.

(3) There is a risk that the ram pin may come out of the ram while the steering gear is operating.

[Problem that the invention attempts to solve]

The present invention was proposed in view of these circumstances, and the purpose is to provide a ram for a fork-type steering gear that makes it easier to prevent the ram pin from rotating and also increases the strength of the ram. do.

[Means for solving problems]

To this end, the present invention provides a ram pin that fits and protrudes into a ram pin hole provided across the central large diameter part of the ram, and slides along a guide rod supported between hydraulic cylinders at both ends of the ram. In a ram of a fork-type steering gear in which a tipping stopper is provided protruding from the outer periphery of the central large diameter part, the ram is engraved at or near one end of the ram pin hole in the ram axis direction, and is fixed to the ram and rotates around the ram pin axis. A key member that prevents rotation of the ram, and a plurality of mounting bolts that are screwed into positions slightly apart from the center of the convex curved surface of the central large diameter portion of the ram having an oblate circular cross section, protrude into the outer periphery of the central portion of the ram. It is characterized in that it is equipped with a fall prevention device.

[Effect]

With such a configuration, it is possible to obtain a ram for a fork-type steering gear that facilitates the work of preventing rotation of the ram pin and also increases the ram strength.

〔Example〕

An embodiment of the present invention will be explained with reference to the drawings.
Fig. 1 is a cross-sectional view including the axis of the ram pin fitting part, Fig. 2 is a front view of Fig. 1, and Fig. 3 is a cross-sectional view of the ram pin fitting part.
FIG. 4 is a diagram showing various modifications of the locking structure of the ram pin shown in FIG. 2,
5 is a plan view of FIG. 4, and FIGS. 6 and 7 are exploded perspective views showing modified examples of the fall stopper shown in FIG. 3, respectively.

In the above figures, the same symbols as in Figs. 8 to 10 indicate the same members as in Figs. 8 to 10, respectively. First, in Figs. The chiller 6, liner 10, stopper 11, fall stopper 13, guide rod 15, and bolts 12, 14 are arranged in the same manner as before, but the difference from the conventional one is that the ram 3 A keyway 3a is provided on the ram shaft centerline of the ram pin hole on the upper surface side of the central large diameter portion, and a keyhole 4a is also provided in the ram pin 4 at the same height position as the keyway 3a, so that the keyway 3a and Fit the key 9a (round or square) into the key hole 4a, and as shown in Fig. 2, use the liner 10 to prevent the key 9a fitted into the keyway 3a of the ram 3 from coming out upwards. Tighten this to ram 3 with 20.

In addition, when installing the anti-falling tool 13, the mounting surface of the anti-falling tool is finished with a concave curved surface, without making a large chamfer as shown in FIGS. It is fixed to the ram via a bolt.

Here, the locking structure of the ram pin is shown in Figure 4A~
Various modifications as shown in E can also be adopted.

In FIG. 9A, the key 9a is a round bar or square, and its axis is arranged parallel to the axis of the ram pin.

In FIG. B, the key 9a is a spherical key,
The keyways of the ram 3 and ram pin 4 are also shaped to match this.

In Figure C, a key 9a is arranged on the lower surface of the ram 3, and is fixed to the ram with a fixture 21 and a bolt 22.

In Figure D, the ram pin 4 is provided with a notch 4a' in the cutting line direction, and the liner 10 is shaped like a hole with a straight portion 10a that fits this notch.
Make the dimension D' slightly larger than the outer diameter D of the ram pin 4.

As a result, the liner 10 can be easily fitted to the ram pin 4 during installation, and the liner 10 can be easily fitted into the ram pin 4 at the notch 4a'.
0 in the lateral direction, the linear portion 10a and the notch 4a' are brought into contact with each other, and the rotation can be prevented by fixing with the fixing bolt 20.

In the same figure E, the key 9a is arranged at an intermediate position other than both ends of the ram pin hole, and the key 9a,
The spacing piece 25 prevents the ram pin 4 from floating up.

According to this structure, the key is located closer to the center of the ram pin, so the strength of the ram pin is slightly improved.

Instead of arranging the key grooves shown in A to E above on the axis center line of the ram 3, as shown in FIG.
It is also possible to provide it at a position inclined by θ° (approximately 0 to 45°) with respect to the axis of the ram.

In addition, as shown in Fig. 6, the fall prevention tool has a notch 3 at a position away from the center of the central large diameter part of the ram.
b, and the fall stopper 13 can be attached to this notch 3b.Furthermore, as shown in FIG. It is also possible to provide the fall prevention tool 13 directly to this.

According to such a structure, the following effects can be achieved.

(1) By arranging the detent near the center line of the ram, there is no need to cut out the center of the large diameter part of the ram.As is clear from comparing Figure 1 with Figure 11, The effective cross section of the ram becomes very large, its strength is greatly improved, and the outer diameter D' of the ram can be reduced, making it possible to significantly reduce material costs.

(2) Since the ram pin is fitted with a key, the ram pin 4 and stopper bolt 9 can be easily assembled because the ram pin can be seen visually.
There was a gap of about 0.1m/m, but with this invention it is visible, so by fitting the key, keyway, and keyhole with a tight fit, it is possible to reduce the gap to zero. Ram 3
Then, the relative rotation of the ram pin 4 is completely eliminated.

[Effect of idea]

In short, according to the present invention, a ram pin is fitted and protruded into a ram pin hole provided across the central large diameter part of the ram, and the ram pin is slid along a guide rod supported between hydraulic cylinders at both ends of the ram. In a ram of a fork type steering gear in which a tipping stopper is provided protruding from the outer periphery of the central large diameter part, the tip is carved at or near one end of the ram pin hole in the ram axis direction and is fixed to the ram to prevent the ram pin from collapsing. It is attached to the outer periphery of the central part of the ram through a key member that prohibits rotation around the ram and a plurality of mounting bolts that are screwed into positions slightly apart from the center of the convex curved surface of the central large diameter part that has a flat circular cross section. The present invention is industrially applicable because it provides a fork-type steering gear ram that facilitates the assembly work of the ram pin, increases the strength of the ram, and reduces costs by being equipped with a protruding anti-falling device. Above all, it is extremely useful.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a front view of FIG. 1, FIG. 3 is a partially exploded perspective view of FIGS. 1 and 2, FIG. This figure is a plan view of FIG. 4, and FIGS. 6 and 7 are exploded perspective views showing modified examples of the fall stopper shown in FIG. 3, respectively. FIG. 8 is a plan view showing a known fork-type steering gear, FIG. 9 is a cross-sectional view taken along - in FIG. 8, and FIG. 10 is a front view taken in the direction of the arrow in FIG.
FIG. 11 is a cross-sectional view of the ram of FIG. 9. 1, 1'... Hydraulic cylinder, 2... Hull structure,
3... Ram, 3a... Keyway, 3b... Notch,
3c... Bolt hole, 4... Ram pin, 4a... Key hole, 4a'... Notch, 5, 5'... Ram pin bushing, 6... Chiller, 6a... Fork part, 7
...Rudder shaft, 8...Key, 9a...Key, 10...
Liner, 10a... Straight section, 11... Stopper, 12... Bolt, 13... Fall stopper, 14
... Bolt, 15 ... Guide rod, 20 ... Bolt, 21 ... Fixture, 22 ... Bolt, 25 ...
Interval piece.

Claims (1)

[Scope of utility model registration request] A ram pin is fitted and protruded into a ram pin hole provided across the central large diameter part of the ram, and a fall stopper that slides along a guide rod supported between hydraulic cylinders at both ends of the ram is attached to the center of the ram. In a ram of a fork-type steering gear that protrudes from the outer periphery of a large diameter part, the ram pin hole is carved at or near one end in the ram axis direction and is fixed to the ram to prohibit rotation around the ram pin axis. A fall prevention tool that protrudes from the outer periphery of the central portion of the ram through a key member and a plurality of mounting bolts that are screwed into positions slightly apart from the center of the convex curved surface of the central large diameter portion of the ram that has an oblate circular cross section. A fork-type steering gear ram characterized by the following.