JPH04231288A - Marine propulsion device - Google Patents

Abstract

PURPOSE: To replace only a damaged gear section by forming each of bevel gear assemblies with a gear section and a means fitting a lug section to the gear section in the shift device of the reversible transmission of a marine propulsion device. CONSTITUTION: Each of bevel gear assemblies 36, 38 of a transmission 34 arranged in a lower gear case is constituted of a gear section 42 rotatably supported on the outer periphery of a propeller shaft 26 and an annular lug section 50 aligning a plurality of lugs 52 and the hole 46 of the gear section 42 and having a central hole 54 inserted with the propeller shaft 26. The gear section 42 is provided with a tooth section 48 engaging a cylindrical hollow hub section 44 to a drive gear 30 and extending from the hub section 44. The lug section 50 is integrally fitted to the gear section 42 by bolts 56.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bevel gear, and more particularly to a bevel gear for a shift device of a reversible transmission of a marine propulsion device.

0002

2. Description of the Related Art Conventional techniques relating to shift devices for reversible transmissions of marine propulsion systems typically include a control member movable in the axial direction of a propeller shaft in order to operate the transmission. The shifting device provides a means for axially moving the control member in response to operator manipulation of the remote control device. The operation of a marine propulsion shifter is disclosed in U.S. Pat. No. 4,849,147 to Higby et al. The disclosure of this US patent is incorporated herein by reference.

0003

The known bevel gears used in such transmissions are integral with ears that are machined directly into the face of the gear. As a result of forming the ears by direct machining on the surface of the gear, if the ears are damaged, the entire gear will be damaged.

Attention should be drawn to the following US patents:

US Patent Number Inventor
Publication date 4,865,570
Higby et al.
September 12, 1989 4,621,714 Skurka November 11, 1986 3,
724,612 Spain
April 3, 1973 1,913,802 Gregory June 13, 1933

[0006]

[Means for Solving the Problems] The present invention includes a housing, a propeller shaft supported by the housing and to which a propeller is attached, a first gear portion rotatable with respect to the propeller shaft, and a first gear portion rotatable with respect to the propeller shaft. a first bevel gear assembly comprising an ear and means for releasably attaching the first ear to the first gear for rotation therewith; and a first bevel gear assembly for rotation therewith on the propeller shaft. It is characterized by comprising a clutch grip that simultaneously moves in the axial direction of the propeller shaft, and means for moving the clutch grip so as to engage with and disengage from the first ear. The present invention provides a marine propulsion system that does the following.

A key feature of the present invention is that the bevel gear assembly comprises a separate gear portion and a separate ear portion, with means for attaching the ear portion to the gear portion. The separate formation of the ears eliminates the need to replace the entire gear assembly if only the ears or gear parts are damaged.

[0008] Furthermore, by forming the ears separately, ears with various sizes can be used in one type of gear design. This eliminates the need to produce gears of substantially the same shape in small quantities and keep them in stock, reducing manufacturing costs.

Other features and advantages of the invention will become readily apparent to those skilled in the art from the following detailed description, drawings, and claims.

0010

Embodiment A marine propulsion system 10 employing the present invention is shown in FIG. The marine propulsion device 10 is located at the stern (tra) of the ship.
(nsom) 14 having a mounting bracket or assembly 12 fixedly attached thereto.

Marine propulsion system 10 further includes a propulsion unit 16 attached to mounting assembly 12 . Propulsion unit 16 includes a powerhead 18 that includes an internal combustion engine 20 . Propulsion unit 16 further includes a lower unit 22 that supports powerhead 18 and has a lower gear case 24 .

As shown in FIGS. 1 and 2, the marine propulsion device 10 further has an axial hole 27 therein, and a substantially horizontal propeller shaft 26 rotatably attached to the lower gear case 24. It has a propeller 28
is installed (Figure 1). The device 10 also includes a drive gear 30 (FIG. 2) rotatably mounted to the lower gear case 24. The engine 20 is drivably connected to a drive gear 30 via a drive shaft 32.

The marine propulsion system 10 further includes a reversible transmission 34 (see FIG. 2) selectively drivingly coupled between the drive gear 30 and the propeller shaft 26. Although any suitable transmission may be used, in the preferred embodiment, the transmission 34 is disposed within the lower gear case 24 and includes a pair of axially separated bevel gear assemblies 36, 38. have. Each bevel gear assembly 36, 3
8 has a gear portion 42 (see FIG. 3) that is supported on the outer periphery of the propeller shaft 26 and is rotatable with respect to the propeller shaft 26. The gear section 42 further includes a hollow, substantially cylindrical hub section 44 having a center hole 46 through which the propeller shaft 26 is inserted, and a tooth section 48 that meshes with the drive gear 30 and extends from the hub section 44 . are doing. Each gear assembly 36, 38 has an annular ear 50 having a plurality of ears 52 and a central hole 54 that is aligned with the hole 46 of the gear portion 42 and through which the propeller shaft 26 extends. . Each gear assembly 36, 38 further includes means 56 for releasably attaching the ear 50 to the gear portion 42 for rotation therebetween. The means 56 for removably attaching the ear 50 to the gear portion 42 preferably
The gear portion 42 includes one or more connecting members that are inserted into the gear portion 42 and engaged with the screw holes 57 of the gear portion 42 . Any suitable connecting member such as a bolt or screw can be used.

The transmission 34 rotates together with the propeller shaft 26, is spline-coupled so as to be movable in the axial direction, and has a clutch latch 58 (see FIG. 2).

The transmission 34 also includes gear assemblies 36, 3
The clutch grip 58 of the clutch is attached to the ear 52 of the ear portion 50 of 8.
and means for selectively and alternately engaging and disengaging. Preferably, this means extends through the axial bore 27 of the propeller shaft 26 and
It has a selector shaft 60 that is movable in the axial direction. The selector shaft 60 is connected to the clutch grip 58
The selector shaft 60 has a pin 62 that engages with the selector shaft 60 to move it along with the selector shaft 60 in the axial direction of the propeller shaft 26. Accordingly, by selectively and alternately drivingly engaging gear assemblies 36, 38 with clutch catch 58, bevel gear assemblies 36, 38 and propeller shaft 26 are selectively and alternately drivingly coupled; The selector shaft 60 is movable in the axial direction of the propeller shaft 26. Such a selector shaft and clutch latch arrangement is disclosed in U.S. Pat. No. 3,919,964 to Hagen. The disclosure of this US patent is incorporated herein by reference.

Transmission 34 transmits forward driving force to propeller shaft 26 when clutch latch 58 engages one lug 52 of bevel gear assembly 36,38. The transmission 34 transmits a reverse drive force to the propeller shaft 26 when the clutch latch 58 engages the other ear 52 of the bevel gear assembly 36,38. The transmission 34 is in neutral when the clutch latch 58 is disengaged from both bevel gear assemblies 36,38. Therefore, the axial movement of the selector shaft 60 shifts the transmission 34 between forward, neutral, and reverse.

An embodiment of the present invention has been described in detail. It should be noted that the application of the invention is not limited only to the details of construction and the arrangement of parts that have been described or illustrated above. Other embodiments of the invention are possible and there are various ways of implementing and carrying out the invention. Furthermore, as in the previous paragraph, the expressions and terms used in this application are for descriptive purposes only and are not intended to be limiting.

[0018]

[Effects of the Invention] As described above, the feature of the present invention is that the bevel gear assembly is composed of a separate gear portion and a separate ear portion, and is configured by means for attaching the ear portion to the gear portion. . By forming the ears separately, there is no need to replace the entire gear assembly if only the ears or gear parts are damaged.

Further, according to the present invention, by forming the ears separately, ears having various sizes can be used in a gear of one type of design. This eliminates the need to produce gears of substantially the same shape in small quantities and keep them in stock, reducing manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 is a side view of a marine propulsion device using the present invention.

FIG. 2 is an enlarged longitudinal sectional view showing the shift device.

FIG. 3 is an exploded perspective view of the bevel gear assembly.

Claims (10)

[Claims] Claims: 1. A housing, a propeller shaft supported by the housing and to which a propeller is attached, a first gear part rotatable with respect to the propeller shaft, a first ear part, and a first gear part rotatable with respect to the propeller shaft. a first bevel gear assembly comprising means for releasably attaching an ear to said first gear portion for rotation therewith; A ship characterized by comprising: a clutch catch connected so as to move in a direction; and means for moving the clutch catch so as to engage with and disengage from the first ear. propulsion device. 2. The marine propulsion device according to claim 1, further comprising an internal combustion engine drivingly connected to the first gear section. 3. The marine propulsion device according to claim 2, further comprising a drive shaft drivingly connected to the engine and drivingly connected to the gear section. 4. The marine vessel propulsion device according to claim 3, further comprising a drive gear driven by the drive shaft and drivingly coupled to the first gear portion. 5. The means for releasably attaching the first ear to the first gear portion includes a coupling member extending through the first ear and to the first gear portion. The marine propulsion device according to claim 1. 6. The means for releasably attaching the first ear to the first gear portion includes a plurality of coupling members extending through the first ear and to the first gear portion. The marine propulsion device according to claim 1. 7. The marine propulsion system according to claim 1, further comprising a second bevel gear assembly. 8. The second bevel gear assembly includes a second gear portion rotatable with respect to the propeller shaft, a second ear portion, and a second ear portion that connects the second ear portion to the second gear portion. 8. The marine propulsion device according to claim 7, further comprising means for removably attaching to the vessel. 9. The means for moving the clutch latch into engagement with and disengagement from the first lug also moves the clutch latch against the second lug. The marine vessel propulsion device according to claim 8, wherein the marine vessel propulsion device is moved to engage and disengage. 10. The marine propulsion system according to claim 9, wherein the clutch catch is located between the first bevel gear assembly and the second bevel gear assembly.