This application claims the benefit of priority to Japanese Patent Application No. 2020-212112 filed on Dec. 22, 2020. The entire contents of this application are hereby incorporated herein by reference.
The present invention relates to an outboard motor.
There are conventional outboard motors known in the art that include an outboard motor main unit having an engine and a propulsion unit, an attachment member attached to a hull, and a support member steerably supporting the outboard motor main unit on the attachment member. For example, JP A 2018-2004 discloses such an outboard motor. The engine and the propulsion unit of the outboard motor main unit are linked together by a drive shaft extending in the up-down direction.
The support member of the outboard motor disclosed in JP A 2018-2004 includes an upper support portion and a lower support portion that support the outboard motor main unit so as to surround the drive shaft, and a left and a right link portion that link together the upper support portion and the lower support portion. The lower support portion is arranged spaced apart downward from the upper support portion. The left and right link portions are formed in a rod shape extending parallel to the drive shaft.
While navigating a watercraft, a lateral load may be applied to a lower portion of the outboard motor main unit. For example, when the watercraft turns, leftward or rightward water pressure may be applied to the propulsion unit. In such a case, a lateral load is applied to the support member via the outboard motor main unit. With conventional outboard motors, there is a need to increase the size or the weight of the support member in order to increase the mechanical strength against lateral loads.
Preferred embodiments of the present invention provide outboard motors each having an increased mechanical strength against lateral loads while preventing an increase in size and weight of the support.
An outboard motor according to a preferred embodiment of the present invention includes an outboard motor main unit including an engine, a propulsion unit located below the engine, and a drive shaft connected to the engine and the propulsion unit. The outboard motor includes an attachment to be attached to a hull, and a support vertically rotatably connected to the attachment and horizontally rotatably supporting the outboard motor main unit. The attachment includes a left clamp bracket and a right clamp bracket located rightward of the left clamp bracket. The support includes a left side located rightward of the left clamp bracket and a right side located leftward of the right clamp bracket, and is sandwiched between the left clamp bracket and the right clamp bracket. The outboard motor includes a left tilt shaft that vertically rotatably links together the left side of the support and the left clamp bracket, and a right tilt shaft that vertically rotatably links together the right side of the support and the right clamp bracket. The outboard motor includes a left reinforcement that includes a left upper connector connected to the support and located leftward of the left side of the support, and a left lower connector connected to the support and located below the left upper connector. The outboard motor includes a right reinforcement that includes a right upper connector connected to the support and located rightward of the right side of the support, and a right lower connector connected to the support and located below the right upper connector.
The outboard motor described above includes the left reinforcement and the right reinforcement that reinforce the support. The left upper connector of the left reinforcement is connected to the support at a position leftward of the left side of the support, and the left lower connector thereof is connected to the support at a position below the left upper connector. The right upper connector of the right reinforcement is connected to the support at a position rightward of the right side of the support, and the right lower connector thereof is connected to the support at a position below the right upper connector. With the outboard motor described above, the left reinforcement and the right reinforcement reinforce the left and right sides of the support. Therefore, with the left reinforcement and the right reinforcement, it is possible to efficiently increase the mechanical strength of the support against lateral loads. While a portion of the lateral load applied to the propulsion unit is transmitted to portions of the outboard motor main unit other than the propulsion unit, another portion of the lateral load is transmitted from the support to the hull via the left reinforcement, the right reinforcement, and the attachment. The lateral load applied to the outboard motor main unit is reduced. Therefore, with the outboard motor described above, it is possible to increase the mechanical strength against lateral loads while preventing an increase in size and weight of the support.
According to preferred embodiments of the present invention, it is possible to provide outboard motors each having an increased mechanical strength against lateral loads while preventing an increase in size and weight of the support.
The above and other elements, features, steps, characteristics and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments with reference to the attached drawings.
Preferred embodiments will now be described with reference to the drawings.
The watercraft 10 includes the hull 11, a steering wheel 12, a remote controller 13, and the outboard motor 100. The outboard motor 100 is attached to the rear portion of the hull 11.
The steering wheel 12 steers the hull 11. As the passenger of the watercraft 10 operates the steering wheel 12, the outboard motor 100 rotates leftward or rightward relative to the hull 11. It is possible to shift gears of the outboard motor 100. By operating the remote controller 13, the passenger is able to switch the state of the outboard motor 100 between forward, backward, and neutral. The outboard motor 100 includes an engine 1 including a throttle valve (not shown). By operating the remote controller 13, the passenger is able to adjust the opening of the throttle valve. By adjusting the opening of the throttle valve, it is possible to adjust the output power of the outboard motor 100.
The outboard motor main unit 101 includes the engine 1, a propulsion unit 5 including a propeller 3, the drive shaft 7 connected to the engine 1 and the propulsion unit 5, and an upper case 20. The engine 1 is located above the upper case 20. The propulsion unit 5 is located below the upper case 20 and is located below the engine 1.
The engine 1 is an internal combustion engine that is driven through combustion of fuel such as gasoline or diesel oil, for example. The engine 1 is covered by a cover 2.
The drive shaft 7 transmits power output from the engine 1 to the propulsion unit 5. The drive shaft 7 extends downward from the engine 1. The drive shaft 7 rotates by being driven by the engine 1.
The propulsion unit 5 includes a propeller shaft 9 on which the propeller 3 is provided, a gear device 15 that links together the drive shaft 7 and the propeller shaft 9, and a lower case 6. The gear device 15 transmits the rotation of the drive shaft 7 to the propeller shaft 9 while decelerating the rotation. Although not shown in the figure, the gear device 15 includes a pinion gear, a forward bevel gear, a backward bevel gear, and a dog clutch. A gear device well known in the art may be suitably used as the gear device 15. The propeller 3 rotates together with the propeller shaft 9, thus generating forward or backward propulsion.
As shown in
The case part 25 and the case part 26 each have a flat plate shape, for example. The case part 26 is located below the case part 25. As shown in
As shown in
The case part 29 is secured to the lower portion of the case part 21. The case part 30 is secured to the lower portion of the case part 22. The case part 29 and the case part 30 are located above the case part 26 and secured to the case part 26.
The case part 23 is connected to the case part 21 and the case part 22. The case part 23 extends in the left-right direction, bridging the lower portion of the case part 21 and the lower portion of the case part 22. The case part 24 is located above the case part 23. The case part 24 extends in the left-right direction, bridging the upper portion of the case part 21 and the upper portion of the case part 22. The case part 24 is connected to the case part 21, the case part 22, and the case part 25. As shown in
As shown in
The upper case 20 is obtained by assembling together the case parts 21 to 30. There is no particular limitation on the manner of assembly of the case parts 21 to 30. Some or all of the case parts 21 to 30 may be attached together by fastening devices such as bolts or may be attached together by welding, or the like, without using fastening devices.
The support member 50 horizontally rotatably supports the outboard motor main unit 101. The support member 50 includes an upper support member 51 and a lower support member 52. The upper support member 51 supports the upper portion of the upper case 20. The lower support member 52 supports the lower portion of the upper case 20. The upper support member 51 and the lower support member 52 are separate from each other, and the lower support member 52 is spaced apart downward from the upper support member 51. The case part 24 is horizontally rotatably supported on the upper support member 51 by the upper steering shaft 61. The case part 23 is horizontally rotatably supported on the lower support member 52 by the lower steering shaft 62. The upper steering shaft 61 and the lower steering shaft 62 horizontally rotatably connect the upper case 20 to the support member 50. In the present preferred embodiment, the axes of the upper steering shaft 61 and the lower steering shaft 62 coincide with the axis 7c of the drive shaft 7. The outboard motor main unit 101 is able to rotate leftward and rightward about the axis 7c.
The attachment member 70 is attached to the rear portion of the hull 11. The support member 50 is connected by a tilt shaft 65 extending in the left-right direction to the attachment member 70. The tilt shaft 65 vertically rotatably links the support member 50 to the attachment member 70. Here, the attachment member 70 is vertically rotatably connected to the upper support member 51 by the tilt shaft 65.
As shown in
As will be described below, the tilt shaft 65 includes a left tilt shaft 65L and a right tilt shaft 65R (see
As shown in
A right reinforcement member 90R is connected to the upper support member 51 and the lower support member 52 (see
As shown in
The left tilt shaft 65L rotatably links together the left side portion 51L of the upper support member 51 and the left clamp bracket 70L. The right tilt shaft 65R rotatably links together the right side portion 51R of the upper support member 51 and the right clamp bracket 70R. In the present preferred embodiment, the left tilt shaft 65L and the right tilt shaft 65R are integral with the upper support member 51. The left tilt shaft 65L, the right tilt shaft 65R, and the upper support member 51 are a single element. Note, however, that there is no limitation thereto. The left tilt shaft 65L and the right tilt shaft 65R may be separate from the upper support member 51. The left tilt shaft 65L may be integral with or separate from the left clamp bracket 70L. The right tilt shaft 65R may be integral with or separate from the right clamp bracket 70R.
As shown in
It is preferred that the left reinforcement member 90L and the right reinforcement member 90R are arranged so as to straddle in the up-down direction at least one of the first link portion 81 and the second link portion 82 of the tilt cylinder 80. That is, it is preferred that at least one of the first link portion 81 and the second link portion 82 of the tilt cylinder 80 is located below an upper end 90t of the left reinforcement member 90L and the right reinforcement member 90R and above a lower end 90b thereof.
In the present preferred embodiment, the left reinforcement member 90L and the right reinforcement member 90R are arranged so as to straddle in the up-down direction both of the first link portion 81 and the second link portion 82 of the tilt cylinder 80. That is, the first link portion 81 and the second link portion 82 of the tilt cylinder 80 are located below the upper end 90t of the left reinforcement member 90L and the right reinforcement member 90R and above the lower end 90b thereof.
As viewed from the side of the outboard motor 100, the left reinforcement member 90L and the right reinforcement member 90R are slanted relative to the drive shaft 7. The left lower connecting portion 92L of the left reinforcement member 90L is located rearward and below the left upper connecting portion 91L. The right lower connecting portion 92R of the right reinforcement member 90R is located rearward and below the right upper connecting portion 91R. The left reinforcement member 90L and the right reinforcement member 90R extend rearward and downward. Therefore, the left reinforcement member 90L and the right reinforcement member 90R are able to suitably support the load in the up-down direction and the front-rear direction. Note that while the left reinforcement member 90L and the right reinforcement member 90R are entirely slanted relative to the drive shaft 7 as viewed from the side of the outboard motor 100 in the present preferred embodiment, the left reinforcement member 90L and the right reinforcement member 90R may be partially slanted relative to the drive shaft 7.
As shown in
While there is no particular limitation on the shape of the left reinforcement member 90L and the right reinforcement member 90R, the left reinforcement member 90L and the right reinforcement member 90R preferably have a plate shape, for example. The dimension of the left reinforcement member 90L and the right reinforcement member 90R in the left-right direction is smaller than that in the front-rear direction and that in the up-down direction. As shown in
The outboard motor 100 is configured as described above. Next, various advantageous effects of the outboard motor 100 according to the present preferred embodiment will be described.
While navigating the watercraft 10, a load in the lateral direction (lateral load) may be applied to a lower portion of the outboard motor main unit 101. For example, when the watercraft 10 turns, leftward or rightward water pressure may be applied to the propulsion unit 5. The propulsion unit 5 is supported by the upper case 20, and the upper case 20 is supported by the support member 50. When a lateral load is applied to the propulsion unit 5, the lateral load is transmitted to the upper case 20. A portion of the lateral load transmitted to the upper case 20 is transmitted to the support member 50. In the present preferred embodiment, the upper case 20 is supported by the upper support member 51 and the lower support member 52. Therefore, when a lateral load is applied to the upper case 20, a portion of the lateral load is transmitted to the upper support member 51 and the lower support member 52. Attempting to support the lateral load with only the upper support member 51 and the lower support member 52 results in a need to increase the mechanical strength of the upper support member 51 and the lower support member 52 against lateral loads, and thus increase the size and the weight of the upper support member 51 and the lower support member 52.
However, with the outboard motor 100 according to the present preferred embodiment, the left reinforcement member 90L and the right reinforcement member 90R are connected to the upper support member 51 and the lower support member 52. The support member 50 is reinforced by the left reinforcement member 90L and the right reinforcement member 90R. Particularly, the left upper connecting portion 91L of the left reinforcement member 90L is located leftward of the left side portion 51L of the upper support member 51, and the right upper connecting portion 91R of the right reinforcement member 90R is located rightward of the right side portion 51R of the upper support member 51. Therefore, with the left reinforcement member 90L and the right reinforcement member 90R, it is possible to efficiently increase the mechanical strength of the support member 50 against lateral loads. A portion of the lateral load that is transmitted from the propulsion unit 5 to the upper case 20 is transmitted from the lower support member 52 to the hull 11 via the left reinforcement member 90L, the right reinforcement member 90R, the upper support member 51, and the attachment member 70. A portion of the lateral load that is transmitted from the propulsion unit 5 to the upper case 20 is transmitted directly to the upper support member 51 from the lower support member 52. This reduces the lateral load applied to the upper case 20. It is possible to prevent an increase in size and weight of the upper case 20. Therefore, with the outboard motor 100 according to the present preferred embodiment, it is possible to increase the mechanical strength against lateral loads while preventing an increase in size and weight of the support member 50.
In the present preferred embodiment, as shown in
As shown in
The left lower connecting portion 92L of the left reinforcement member 90L is located rearward of the left upper connecting portion 91L, and the right lower connecting portion 92R of the right reinforcement member 90R is located rearward of the right upper connecting portion 91R. The left reinforcement member 90L and the right reinforcement member 90R extend downward and rearward. Therefore, the left reinforcement member 90L and the right reinforcement member 90R are able to sufficiently support a load in the left-right direction (i.e., a lateral load), and also support a load in the up-down direction and the front-rear direction. Thus, it is possible to increase the mechanical strength of the support member 50.
As shown in
While the support member 50 may be an integral member, it includes in the present preferred embodiment the upper support member 51 and the lower support member 52 that are separate from each other. The lower support member 52 is spaced apart downward from the upper support member 51. The support member 50 includes no member that links together the upper support member 51 and the lower support member 52. Therefore, as compared with a case in which the support member 50 is an integral member, it is possible to reduce the size and the weight of the support member 50. The left upper connecting portion 91L of the left reinforcement member 90L and the right upper connecting portion 91R of the right reinforcement member 90R are connected to the upper support member 51, and the left lower connecting portion 92L of the left reinforcement member 90L and the right lower connecting portion 92R of the right reinforcement member 90R are connected to the lower support member 52. Thus, although the support member 50 includes the upper support member 51 and the lower support member 52, which are separate from each other, it is possible with the left reinforcement member 90L and the right reinforcement member 90R to sufficiently increase the mechanical strength of the support member 50 against lateral loads.
While there is no particular limitation on the shape of the left reinforcement member 90L and the right reinforcement member 90R, the left reinforcement member 90L and the right reinforcement member 90R each preferably have a plate shape, for example, in the present preferred embodiment. Therefore, it is possible to easily manufacture the left reinforcement member 90L and the right reinforcement member 90R.
The left reinforcement member 90L and the right reinforcement member 90R include the holes 94 that extend in the left-right direction. Therefore, it is possible to reduce the weight of the left reinforcement member 90L and the right reinforcement member 90R.
While preferred embodiments of the present invention have been described above, the preferred embodiments are merely illustrative, and various alternative preferred embodiments are possible. Next, alternative preferred embodiments of the present invention will be described briefly.
As shown in
As shown in
At least a portion of the steering actuator 85 is preferably located between the left reinforcement member 90L and the right reinforcement member 90R. Then, the space between the left reinforcement member 90L and the right reinforcement member 90R may be used as an installation space for the steering actuator 85. It is possible to reduce the size of the outboard motor 100.
The steering actuator 85 may also define and function as a lateral reinforcement member. For example, the left end portion of the left rod 85L may be connected to the left reinforcement member 90L, and the right end portion of the right rod 85R may be connected to the right reinforcement member 90R. Then, the left rod 85L, the cylinder 85C, and the right rod 85R define and function as a lateral reinforcement member bridging the left reinforcement member 90L and the right reinforcement member 90R. Thus, by using the steering actuator 85 as a lateral reinforcement member, it is possible to increase the mechanical strength of the support member 50 against lateral loads without increasing the number of components.
As shown in
As shown in
As shown in
As shown in
The left upper connecting portion 91L of the left reinforcement member 90L may be connected to any of the left cover 54L, the left tilt shaft 65L, and the left side portion 51L of the upper support member 51, or may be connected to a portion of the upper support member 51 other than the left side portion 51L. The right upper connecting portion 91R of the right reinforcement member 90R may be connected to any of the right cover 54R, the right tilt shaft 65R, and the right side portion 51R of the upper support member 51, or may be connected to a portion of the upper support member 51 other than the right side portion 51R.
While the left reinforcement member 90L and the right reinforcement member 90R preferably have a plate shape in the preferred embodiments described above, there is no particular limitation thereto. For example, the left reinforcement member 90L and the right reinforcement member 90R may have a rod shape. The left reinforcement member 90L and the right reinforcement member 90R may or may not be shaped in left-right symmetry.
The holes 94 of the left reinforcement member 90L and the right reinforcement member 90R are not always necessary. The holes 94 may be absent.
The case part 21 and the case part 22 of the upper case 20 do not need to oppose each other in the left-right direction. The case part 21 and the case part 22 of the upper case 20 may oppose each other in the front-rear direction. The upper case 20 does not need to have a frame structure obtained by assembling together the case parts 21 to 30. The upper case 20 may have a closed tubular shape.
As shown in
The terms and expressions used herein are used for explanation purposes and should not be construed as being restrictive. It should be appreciated that the terms and expressions used herein do not eliminate any equivalents of features illustrated and mentioned herein, but include various modifications falling within the claimed scope of the present invention. The present invention may be embodied in many different forms. The present disclosure is to be considered as providing examples of the principles of the present invention. These examples are described herein with the understanding that such examples are not intended to limit the present invention to preferred embodiments described herein and/or illustrated herein. Hence, the present invention is not limited to the preferred embodiments described herein. The present invention includes any and all preferred embodiments including equivalent elements, modifications, omissions, combinations, adaptations and/or alterations as would be appreciated by those skilled in the art on the basis of the present disclosure. The limitations in the claims are to be interpreted broadly based on the language included in the claims and not limited to examples described in the present specification or during the prosecution of the application.
While preferred embodiments of the present invention have been described above, it is to be understood that variations and modifications will be apparent to those skilled in the art without departing from the scope and spirit of the present invention. The scope of the present invention, therefore, is to be determined solely by the following claims.
Number | Date | Country | Kind |
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2020-212112 | Dec 2020 | JP | national |
Number | Name | Date | Kind |
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3486724 | Adamski | Dec 1969 | A |
4954107 | Sumigawa | Sep 1990 | A |
9033752 | Takase | May 2015 | B2 |
20090170384 | Balogh et al. | Jul 2009 | A1 |
20180001983 | Mizutani | Jan 2018 | A1 |
Number | Date | Country |
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2018-2004 | Jan 2018 | JP |
343 809 | Mar 1972 | SE |
Entry |
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Official Communication issued in corresponding European Patent Application No. 21200945.0, mailed on Apr. 5, 2022. |
Number | Date | Country | |
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20220194536 A1 | Jun 2022 | US |