JP3058950B2 - Thrust support device for marine speed reducer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thrust support device for a marine speed reducer.

[0002]

2. Description of the Related Art In a marine deceleration / reversing machine, a support shaft is provided between an input shaft and an output shaft connected to the engine side, and normally (forward rotation specification), when moving forward, power is directly transmitted from the input shaft to the output shaft. When the vehicle is moving backward, the power of the input shaft is once transmitted to the support shaft, and then transmitted from the gear on the support shaft to the output shaft. 3 and 4 show the structure, in which (1) is an input shaft, (2) is an output shaft, and (3) is a support shaft. It is supported in parallel to. When the input shaft (1) is directly connected to the engine (4), a drive gear (5) that rotates integrally with the input shaft (1) and a first pinion (6) that is freely rotatable are attached to the input shaft (1). It is connected via one clutch (7). A driven gear (8), which meshes with the drive gear (5) and rotates integrally with the support shaft (3), and a free-rotating second pinion (9) are attached to the support shaft (3). , Are connected via a second clutch (10).

[0003] A large gear (12) is attached to the output shaft (2) to which the propeller (11) is attached.
Each of the pinions (6) and (9) is occluded. FIG. 4 shows a case where the motor is used in a forward rotation state, in which (a) is the forward side, (b) is the reverse side, and the arrows on the axes in the figure indicate the rotation directions of the respective axes. , The diagonal lines of the gears indicate the torsional directions of the teeth. Further, straight arrows indicate the direction of the thrust force generated by each gear and the propeller (11). As shown in this figure, the thrust force on the support shaft (3) and the output shaft (2) sets the torsional direction of the teeth in such a direction that they cancel each other in both forward and backward travel.

[0004]

By the way, as described above, the side passing through the support shaft (3) is changed to the forward rotation specification in which the reverse direction is set, and the reverse rotation specification in which the side passing the support shaft (3) is set in the forward direction is mounted. There are cases. For example, in a two-machine two-shaft engine in which two engines are attached to each other and another propeller (11) is driven via a speed reduction / reversing machine connected to each engine, the rotation directions of the output shafts of both speed reduction / reversing machines are Reverse and propeller (1
By changing the twist direction of 1), thrust is obtained by two propellers (11).

In recent years, due to the diversification of fishing work, a forward two-speed deceleration / reversing machine has been widely used. In this case, the structure shown in FIG. The shaft mechanism (13) for the second forward speed is attached as described above, and the pinion (6) side of the input shaft (1) is moved backward and the support shaft (3) side is moved forward as in the case of the reverse rotation specification. It has been used as a speed.

[0006] However, at the time of forward running in the case of the reverse rotation specification and the forward second speed, as shown in FIG. 6, the rotation directions of the respective shafts are the same, but the torsional directions of the propeller (11) are different. Since the thrust of the propeller (11) is in the opposite direction to the reverse rotation in the case of the forward rotation specification, there is a disadvantage that the thrust force is canceled in each other in the case of the forward rotation specification, but the thrust force acts in the same direction. For this reason, the thrust applied to the bearing portion of the output shaft (2) becomes extremely large, so that the bearing and the case must be made large, and there is a drawback that the compactness cannot be achieved. In this case, of course, it is conceivable to change the torsional direction of the teeth of the large gear (12) of the output shaft (2) so as to be opposite to the thrust of the propeller (11). FIG. 7 shows this state. However, in this case, even if the problem of the thrust on the output shaft (2) can be solved, the thrust on the support shaft (3) is in the same direction, and the same problem as described above occurs. Become.

FIG. 8 shows a state in which the torsional direction of the driven gear (8) is further changed so that the thrust force on the support shaft (3) is canceled. This certainly solves the thrust problem, but does not
2) and not only the first pinion (6) and the second pinion (9) are replaced, but also the driven gear (8) and the drive gear (5) on the input shaft (1). And there is a disadvantage that the cost for changing the specifications is greatly increased. In particular, in order to meet the recent demands of the reverse rotation type and the second forward speed, such a cost increase is a large negative.

[0008] That is, an object of the present invention is to eliminate such a conventional disadvantage, and even in the case of a reverse rotation specification,
By simply replacing the large gear on the output shaft and the pinion that meshes with it, at least at the time of forward movement, the thrust forces generated on the shafts are mutually canceled.

[0009]

In order to solve the above-mentioned problems, the present invention, as shown in FIGS. 1 and 2, uses a power transmission path via a support shaft (3) as a reverse drive. Means that the thrust forces generated by the gears on the support (3) shaft are in the same direction, but the thrust forces on the output shaft cancel each other, while when used as the forward side, The above-mentioned usage pattern is changed so that the thrust forces cancel each other, and the thrust forces generated on the output shaft (2) also cancel each other.
With the change in the twisting direction of the propeller (11)
Large gear (12) on output shaft (2) and pinion engaging with it
This is to change the twist direction of (9).

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a state of use in the case of a forward rotation specification, in which (a) shows a state of forward movement and (b) shows a state of reverse movement. As shown in this figure, in the case of the forward rotation specification, the thrust forces generated by the large gear (12) and the propeller (11) at the time of output cancel each other out so that the gears (5), (6) and (8) cancel each other out. (9) The torsional directions of the teeth of (9) and (12) are set. On the other hand, on the support shaft (3), the second pinion (9) has a direction of teeth twisted in a direction to engage with the large gear (12), and the driven gear (8) has an input shaft (1). The torsional direction of the teeth is determined according to the upper drive gear (5), and it is rarely used.
In addition, the thrust force on the support shaft (8) is set to be in the same direction when the vehicle is traveling backward with a small thrust force. FIG. 2 shows the case of using as a reverse rotation specification,
In this case, the direction of the large gear (12) is changed so as to balance the thrust of the propeller (11) with the change of the torsional direction of the propeller (11), and the support shaft (3) and the Pinion (6) (9) of input shaft (1)
Has changed direction. Thus, both the output shaft (2) and the support shaft (3) have a structure in which the thrust force is canceled. The torsional directions of the teeth of the drive gear (5) and the driven gear (8) are the same as those in the case of the forward rotation type, and are the same. That is, compared to the case of FIG. 8, there is no need to replace all the gears, and the cost for the change can be reduced.

[0011]

As described above, according to the present invention, even if the thrust of the support shaft at the time of reverse travel cannot be canceled in the forward rotation specification, even in the reverse rotation specification, the thrust force can be reduced only by replacing a part of the gears. Can be easily changed to a configuration that cancels out each other, so that the cost for the change can be reduced, the bearing portion can be made smaller, and the entire reduction and reversing device can be made more compact. On the other hand, the thrust force on the support shaft at the time of the forward rotation specification is relatively rarely used, and at the time of reverse driving with small propulsion force,
Even in the same direction, there is no particular problem.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a rotation direction and a thrust direction in a forward rotation specification according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a rotation direction and a thrust direction in a reverse rotation specification.

FIG. 3 is a side view of an arrangement structure of each gear as viewed from an axial side surface.

FIG. 4 is a schematic view showing a rotation direction and a thrust direction in a forward rotation specification in a conventional example.

FIG. 5 is a side view showing an arrangement of gears in a case of a second forward speed, viewed from an axial direction.

FIG. 6 is a schematic view showing a rotation direction and a thrust direction in a reverse rotation specification in the conventional example.

FIG. 7 is a schematic diagram of a state in which the torsional direction of the gear is changed so as to cancel the thrust of the output shaft in the reverse rotation specification.

FIG. 8 is a schematic explanatory view showing a state in which the twist direction of the gear is changed.

[Explanation of symbols]

 (1) Input shaft (2) Output shaft (3) Support shaft (4) Engine (5) Drive gear (6) Pinion (7) Clutch (8) Driven gear (9) Pinion (10) Clutch (11) Propeller (12) Large gear

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B63H 23/08 F16H 3/14

Claims (1)

(57) [Claims] An input shaft, a support shaft and an output shaft supported in parallel with each other, wherein a drive gear on the input shaft and a driven gear on the support shaft are intermeshed with each other, and the input shaft and the support shaft are mutually supported. Each of the pinion gears is engaged with a large gear on the output shaft, and a clutch that connects the drive gear and the pinion gear on the input shaft, and a clutch that connects the driven gear and the pinion on the support shaft is provided in a reduction gear reversing machine. When the above gears are helical gears and the power transmission path for driving the large gear from the pinion gear of the support shaft is used as the reverse side, the thrust force generated by the gears on the support shaft is in the same direction. However, the thrust forces generated by the large gear and propeller on the output shaft cancel each other out, while when used as the forward side, Thrust force generated by the gear on the port axis cancel each other, also, so that the thrust force generated by the large gear and the propeller on the output shaft also cancel each other, propenyl due to a change of the use forms
With the change of the torsional direction of the gear, the large gear on the output shaft
A thrust support device for a marine reduction reversing machine characterized by changing a twisting direction of a pinion that meshes therewith .