JPH0686896B2 - Propeller drive for ship propulsion - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a propeller drive device for a marine propulsion device, which is suitable for use in an outboard motor, an outboard motor, and the like.

[Background Art] As a propeller drive device for a ship propulsion device, a casing,
The drive shaft vertically installed inside the casing, the pinion fixed to the lower end of the drive shaft, and the rear and rear bearings supported by the front and rear bearings arranged in the lower portion inside the casing A forward gear and a reverse gear that are respectively mounted rotatably between a projecting propeller shaft and a portion of the propeller shaft supported by a front bearing and a portion supported by a rear bearing and mesh with both diametrically opposite portions of the pinion. And a clutch body that is mounted between the portion of the propeller shaft where the forward gear is mounted and the portion where the reverse gear is mounted so as to selectively integrate both the forward gear and the reverse gear into the propeller shaft, and the propeller shaft What has a propeller fixed to a portion projecting from the rear of the casing is used.

By the way, in a conventional propeller drive device, a stopper portion that allows a load acting toward the axial rear of the propeller shaft to be transmitted to a rear bearing is engaged with a forward gear or a reverse gear located behind the clutch body of the propeller shaft. It is provided in a compatible area.

Therefore, in the above-mentioned conventional propeller shaft drive device, underwater suspended matter such as rope is entangled in the propeller, and the underwater suspended matter bites between the casing and the propeller, thereby causing a large load toward the axial rear of the propeller shaft. Is applied, the load is transmitted to the rear bearing via the stopper portion, the forward gear or the reverse gear with which the stopper portion engages, and is reliably supported by the rear bearing, whereby the propeller shaft is supported against the load. So that it can be securely retained.

However, in the propeller drive device, the forward gear idles in the reverse direction with respect to the propeller shaft during the reverse shift of the clutch body, and the reverse gear idles in the reverse direction with respect to the propeller shaft during the forward shift of the clutch body. That is, in the conventional propeller drive device, the stopper portion that transmits the load acting toward the axial rear of the propeller shaft has the forward gear or the reverse gear that may rotate in the reverse direction with respect to the propeller shaft. Will be sandwiched between the rear bearing and the rear bearing with a large load, and seizure due to friction heat due to the sandwiching pressure will occur between the stopper and the forward gear or reverse gear, and between the forward gear or reverse gear and the rear bearing. May occur.

Further, in a propeller drive device for a marine propulsion device, it is also desired to improve maintainability, reduce wear of a load bearing surface of a rear bearing, and adjust backlash of a pinion and a reverse gear. .

[Object of the Invention] The present invention makes it possible to reliably prevent the propeller shaft from slipping off from a load when a large load acts axially rearward of the propeller shaft, and the propeller shaft based on the load. It is an object of the present invention to prevent the occurrence of seizure around, improve the maintainability, reduce the wear of the load bearing surface of the rear bearing, and adjust the backlash of the pinion and the reverse gear.

[Means for Solving the Problems] A propeller drive device for a marine propulsion device according to the present invention includes a portion on the outer periphery of a propeller shaft, on which a reverse gear located behind a clutch body is mounted, and a portion supported by a rear bearing. A stopper portion having a stepped outer periphery of the propeller shaft is provided between the stopper and the rear bearing, and a shim is interposed between the stopper portion and the rear bearing, and one surface of the shim and the front end portion of the rear bearing are provided as a surface. To make the outer diameter of the shim larger than the outer diameter of the stopper,
The other surface of the shim is brought into surface contact with the stopper portion and also with the rear end surface of the reverse gear.

[Operation] According to the present invention, there are the following operation effects.

When a large load acts axially rearward of the propeller shaft, the load is transmitted to the rear bearing through the stopper portion and is reliably supported by the rear bearing, and therefore the propeller shaft is supported against the load. So that it can be securely retained.
Further, the stopper portion for transmitting the load does not pinch the forward gear or the reverse gear, which may rotate in reverse with respect to the propeller shaft, with the rear bearing, and accordingly, the stopper portion around the propeller shaft based on the load is It becomes possible to prevent the occurrence of seizure.

"A stopper is formed on the outer circumference of the propeller shaft, and a shim is interposed between the stopper and the rear bearing." The bearing is exchanged even if the shim is worn because it is loaded axially rearward. Only the shim needs to be replaced without doing so, workability at the time of replacement is good, and maintainability can be improved.

Since the shim and the front end surface (load support surface) of the rear bearing are in surface contact and the outer diameter of the shim is larger than the outer diameter of the stopper part, the contact surface pressure between the shim and the rear bearing is sufficient. Therefore, it is possible to reduce the wear of the load bearing surface of the rear bearing.

Since the shim is in surface contact with the stopper portion and is in surface contact with the rear end surface of the reverse gear, the backlash of the pinion and the reverse gear can be adjusted at the same time.

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing a main portion of an outboard motor according to a first embodiment of the present invention in a cutaway manner.

In FIG. 1, 11 is a casing, and the casing 11
An engine unit (not shown) is mounted on the upper part of the drive shaft, and a drive shaft 12 capable of transmitting the output of the engine is vertically installed inside the casing 11 while being supported by bearings 13, 14, 15 and the like. A pinion 16 is fixed to the lower end of 12.

Further, in the lower part inside the casing 11, the front bearing 17,
A rear bearing 19 held by a bearing housing 18 is arranged, and a propeller shaft 20 projecting rearward of the casing 11 is supported by the front bearing 17 and the rear bearing 19. Further, between the portion of the propeller shaft 20 supported by the front bearing 17 and the portion of the propeller shaft 19 supported by the rear bearing 19, a forward gear 21 and a reverse gear 22 meshing with the diametrically opposite side portions of the pinion 16 are respectively idle. It is installed so that it can be rolled. A boss portion of the forward gear 21 is interposed between the propeller shaft 20 and the front bearing 17. That is, the forward gear 21 and the reverse gear 22 mesh with the pinion 16 and can be rotationally driven in opposite directions.

The part where the forward gear 21 of the propeller shaft 20 is mounted and the reverse gear
A clutch body 23 for forward shifting is mounted between the portions where the 22 is mounted, so that both the forward gear 21 and the reverse gear 22 can be selectively integrated with the propeller shaft 20. That is,
The clutch body 23 is located between the forward gear 21 and the reverse gear 22 and is spline-coupled to the propeller shaft 20 so as to be slidable in the axial direction. Claws 24F and 24R projecting in the axial direction are formed on both end surfaces of the clutch body 23, while the forward gears 21 and 22 are formed.
Also, these claws 25F, 2 that can be engaged with these claws 24F, 24R
5R is formed. Reference numerals 26, 27 and 28 are a spring, an engagement body and a plunger which are inserted into the propeller shaft 20. The propeller shaft 20 is formed with a long hole 29 that is long in the axial direction, and the engaging body 27
Is sandwiched between the spring 26 and the plunger 28, and moves back and forth so as to cross the elongated hole 29. Reference numeral 30 denotes a pin, which penetrates the engagement body 27 and the elongated hole 29, and further penetrates the clutch body 23 to face an annular groove 31 formed on the outer periphery of the clutch body 23. A coil spring 32 is attached to the annular groove 31 to prevent the pin 30 from falling off. The pin 30 moves in the axial direction within the range of the long hole 29 together with the engaging body 27, and directly moves the clutch body 23 as well.

Reference numeral 33 is a shift rod that can be driven by a forward / backward shift cable or the like (not shown). A shift cam 34 is fixed to the lower end of the shift rod 33. The shift cam 34 is
It has a forward cam surface, a neutral cam surface, and a reverse cam surface that come into contact with the plunger 28. Under the elastic force of the spring 26, the clutch body 23 is moved through the pin 30 to the forward position, the neutral position, and the reverse position.
It can be driven to the position. As a result, the clutch body 23
Is a pawl 25 of the forward gear 21 that is constantly meshed with the pinion 16.
The propeller shaft 20 is rotated forward by engaging the claw 24F with the F, and the propeller shaft 20 is engaged with the claw 24R of the reverse gear 22 that is always engaged with the pinion 16 by engaging the claw 24R.
Is capable of reverse rotation.

A propeller 35 is fixed to a portion of the propeller shaft 20 protruding from the rear of the casing 11. The propeller 35 has wings
36, an outer boss portion 37 integrally formed with the wing portion 36, an inner boss portion 38 mounted on the projecting portion of the propeller shaft 20, and an interposition between the outer boss portion 37 and the inner boss portion 38. The outer boss portion 37 and the damper member 39 are joined together by press fitting, and the inner boss portion 38 and the damper member 39 are joined together by baking. Also, the inner boss
The rear end portion of the inner boss portion 38 extends rearward from the rear end portion of the outer boss portion 37, and the drive pin 40 is inserted through the rear end portion of the inner boss portion 38 and the propeller shaft 20. That is, the propeller shaft 20 and the propeller 35 are integrated in the axial direction and the rotation direction by the drive pin 40. In addition,
The drive pin 40 is screwed to the rearmost end of the propeller shaft 20, and its inner surface is prevented from coming off by caps 41 facing both end surfaces of the drive pin 40. The cap 41 is integrated with a nut 42 screwed to a threaded portion formed at the rearmost end of the propeller shaft 20 in a press-fitted state, and is fixed to the propeller shaft 20 by a turning pin 43.

In the first embodiment, by selecting the twisting direction of the tooth portions of the pinion 16 and the reverse gear 22, the reverse gear 22 produces meshing reaction force toward the axial rear of the propeller shaft 20 by meshing with the pinion 16. It is supposed to be.

Therefore, in the first embodiment, the stopper portion 44 for transmitting the load acting axially rearward of the propeller shaft 20 to the rear bearing 19 is provided with the reverse gear 22 and the rear bearing on the outer circumference of the propeller shaft 20. The outer circumference of the propeller shaft 20 is provided between the first and the second shaft 19 by forming a step shape. The stopper part
A shim 45 having an outer diameter larger than the outer diameter of the stopper portion 44 is interposed between the 44 and the inner ring of the rear bearing 19. And sim
The surface of 45 is brought into surface contact with the front end surface of the rear bearing 19, and the shim
The outer diameter of 45 is made larger than the outer diameter of the stopper portion 44, and the other surface of the shim 45 is brought into surface contact with the stopper portion 44 and also with the rear end surface of the reverse gear 22.

Next, the operation of the first embodiment will be described.

During operation of the outboard motor, the drive gear 12 and the pinion 16 rotate and the forward gear 21 and the reverse gear 22 constantly rotate. Therefore, during forward operation, the claw 24F of the clutch body 23 is engaged with the claw 25F of the forward gear 21 by operating the shift rod 33, the rotation of the forward gear 21 is transmitted to the propeller shaft 20, and the propeller 35 is rotated forward. At this time, the reverse gear 22 reversely rotates with respect to the propeller shaft 20. On the other hand, during the reverse operation, the claw 24R of the clutch body 23 is engaged with the claw 25R of the reverse gear 22 by operating the shift rod 33, the rotation of the reverse gear 22 is transmitted to the propeller shaft 20, and the propeller 35 is rotated backward.

During the operation of the outboard motor, underwater suspended matter such as rope is entangled in the propeller 35, the underwater suspended matter bites between the casing 11 and the propeller 35, and a large load is applied toward the axial rear of the propeller shaft 20. When actuated, the load is transmitted to the shim 45 and the rear bearing 19 via the stopper portion 44, and is reliably supported by the rear bearing 19, so that the propeller shaft 20 can be reliably prevented from coming off from the load.

Here, as described above, the stopper portion 44 that transmits the load does not pinch the reverse gear 22, which may rotate in reverse with respect to the propeller shaft 20, between the propeller shaft 20 and the rear bearing 19. The shim 45 that rotates in the same direction presses the inner ring of the rear bearing 19, so that it is possible to prevent seizure around the propeller shaft 20 due to the load.

Further, a stopper portion 44 is formed on the outer circumference of the propeller shaft 20, and a shim 45 is interposed between the stopper portion 44 and the rear bearing 19, and the shim 45 is worn because a load in the axial rear direction is received. Also in this case, it is sufficient to replace only the shim 45 without replacing the bearing, and the workability at the time of replacement is good and the maintainability can be improved.

Further, "the shim 45 and the front end surface (load supporting surface) of the rear bearing 19 are in surface contact with each other so that the outer diameter of the shim 45 is larger than the outer diameter of the stopper portion 44." It is possible to sufficiently lower the contact surface pressure between the rear bearings and to reduce the wear of the load bearing surface of the rear bearing 19.

In addition, "the shim 45 is in surface contact with the stopper portion 44,
Since it is decided to make surface contact with the rear end surface of the reverse gear 22, "the backlash of the pinion 16 and the reverse gear 22 can be adjusted at the same time.

[Advantages of the Invention] As described below, according to the present invention, when a large load acts axially rearward of the propeller shaft, the propeller shaft can be reliably prevented from coming off from the load. It is possible to prevent seizure around the propeller shaft due to the load, improve the maintainability, reduce the wear of the load bearing surface of the rear bearing, and adjust the backlash of the pinion and reverse gear. be able to.

[Brief description of drawings]

FIG. 1 is a side view showing a main portion of an outboard motor according to a first embodiment of the present invention in a cutaway manner. 11 …… Casing, 12 …… Drive shaft, 16 …… Pinion, 17 …… Front bearing, 19 …… Rear bearing, 20 …… Propeller shaft, 21 …… Forward gear, 22 …… Reverse gear, 23 …… Clutch body, 35 …… propeller, 44 …… stopper part, 45 …… Shim.

Claims (1)

[Claims] 1. A casing, a drive shaft vertically installed inside the casing, a pinion fixed to a lower end portion of the drive shaft, and a front bearing and a rear bearing arranged at a lower portion inside the casing. The propeller shaft that is supported by the projecting part and projects rearward of the casing, and the propeller shaft is rotatably mounted between the part supported by the front bearing and the part supported by the rear bearing of the propeller shaft. Installed between the forward gear and reverse gear that mesh with the parts, and the part of the propeller shaft where the forward gear is installed and the part where the reverse gear is installed so that both the forward gear and the reverse gear are selectively integrated with the propeller shaft. In a propeller drive device for a boat propulsion device, the propeller drive device includes a clutch body that operates and a propeller that is fixed to a portion of the propeller shaft that projects from the rear of the casing. A stopper portion having a stepped outer periphery of the propeller shaft is provided between a portion where a reverse gear is mounted behind the clutch body and a portion which is supported by a rear bearing, and the stopper portion and the rear portion are provided. A shim is interposed between the bearing and one surface of the shim and the front end of the rear bearing are in surface contact with each other so that the outer diameter of the shim is larger than the outer diameter of the stopper portion. A propeller drive device for a ship propulsion device, which is in surface contact with the rear end face of a reverse gear as well as in surface contact with the rear gear.