The present disclosure relates to marine drives, and in particular stern drives having a powerhead for propulsion, such as an engine and/or an electric motor.
The following U.S. Patents are incorporated herein by reference in entirety.
U.S. Pat. No. 6,287,159 discloses a support apparatus for a marine propulsion system in a marine vessel wherein a compliant member that is attachable to the transom of a marine vessel. In certain applications, the compliant member is directly attached to an intermediate plate and to an external frame member that is, in turn, attached directly to the transom of the marine vessel. The intermediate plate is attached directly to components of the marine propulsion system to provide support for the marine propulsion system relative to the transom, but while maintaining non-contact association between the marine propulsion system and the transom.
U.S. Pat. No. 9,205,906 discloses a mounting arrangement for supporting an outboard motor with respect to a marine vessel extending in a fore-aft plane. The mounting arrangement comprises first and second mounts that each have an outer shell, an inner wedge concentrically disposed in the outer shell, and an elastomeric spacer between the outer shell and the inner wedge. Each of the first and second mounts extend along an axial direction, along a vertical direction that is perpendicular to the axial direction, and along a horizontal direction that is perpendicular to the axial direction and perpendicular to the vertical direction. The inner wedges of the first and second mounts both have a non-circular shape when viewed in a cross-section taken perpendicular to the axial direction. The non-circular shape comprises a first outer surface that extends transversely at an angle to the horizontal and vertical directions. The non-circular shape comprises a second outer surface that extends transversely at a different, second angle to the horizontal and vertical directions.
U.S. Pat. No. 9,446,828 discloses an apparatus for mounting a marine drive to a hull of a marine vessel. An outer clamping plate faces an outside surface of the hull, and an inner clamping plate faces an opposing inside surface of the hull. A marine drive housing extends through the hull. The marine drive housing is held in place with respect to the hull by at least one vibration dampening sealing member which is disposed between the inner and outer clamping plates. A first connector clamps the outer clamping plate to the outside surface of the hull and a second connector clamps the inner clamping plate to the outer clamping plate. The inner and outer clamping plates are held at a fixed distance from each other so that a consistent compression force is applied to the vibration dampening sealing member.
This Summary is provided to introduce a selection of concepts which are further described herein below in the Detailed Description. This Summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used as an aid in limiting the scope of the claimed subject matter.
In non-limiting examples disclosed herein, a stern drive is configured for a marine vessel having a transom. The stern drive includes a drive assembly comprising a drive unit configured to generate a thrust force in water, a powerhead configured to power the drive unit, and a transom bracket assembly configured to support the drive unit outside of the transom and further configured to support the powerhead inside of the transom, wherein the transom bracket assembly is configured to vibrationally isolate the drive unit and the powerhead relative to the transom.
Optionally, the powerhead may comprise an engine. Optionally, the transom bracket assembly may comprise a transom housing configured for positioning in an opening in the transom, and the transom housing may include an outer end coupled to the drive unit and an inner end coupled to the powerhead. Optionally, the transom bracket assembly may comprise an outer clamp bracket configured for attachment to an outside surface of the transom and an inner clamp bracket configured for attachment to an inside surface of the transom. Optionally, outer clamp bracket and the inner clamp bracket may be configured to be clamped together on the transom.
Optionally, the transom bracket assembly may comprise an outer vibration dampener which vibrationally isolates the drive unit and the powerhead relative to the outer clamp bracket. Optionally, the transom bracket assembly may comprise an inner vibration dampener which is separate from the outer vibration dampener and which vibrationally isolates the drive unit and the powerhead relative to the inner clamp bracket. Optionally, the inner vibration dampener may comprise a mount having an outer shell, a mounting hardpoint concentrically disposed in the outer shell, and an elastomeric spacer between the outer shell and the mounting hardpoint. Optionally, the inner vibration dampener may comprise a plurality of vibration dampening mounts spaced around the inner clamp bracket. Optionally, the outer vibration dampener may comprise a seal configured to prevent water intrusion to the marine vessel between the transom housing and the outer clamp bracket. Optionally, the seal may comprise a monolithic dual O-ring. Optionally, the transom bracket assembly may comprise a clamp plate which clamps the seal in place between the transom housing and the outer clamp bracket.
In non-limiting examples, a transom bracket assembly is for mounting a stern drive to a marine vessel. The transom bracket assembly comprises a transom housing configured for positioning in an opening in the transom, the transom housing comprising an outer end for coupling to a drive unit of the stern drive and an inner end for coupling to a powerhead of the stern drive; an outer clamp bracket configured for attachment to an outside surface of the transom and an inner clamp bracket configured for attachment to an inside surface of the transom; an outer vibration dampener configured to vibrationally isolate the drive unit and the powerhead relative to the outer clamp bracket; and an inner vibration dampener which is separate from the outer vibration dampener and which is configured to vibrationally isolate the drive unit and the powerhead relative to the inner clamp bracket.
Optionally, the outer vibration dampener may comprise a seal configured to prevent water intrusion to the marine vessel between the transom housing and the outer clamp bracket. Optionally, the seal may comprise a monolithic dual O-ring. Optionally, the transom bracket assembly may comprise a clamp plate which clamps the seal in place between the transom housing and the outer clamp bracket. Optionally, the inner vibration dampener may comprise a mount having an outer shell, a mounting hardpoint concentrically disposed in the outer shell, and an elastomeric spacer between the outer shell and the mounting hardpoint. Optionally, the inner vibration dampener may have a cylindrical shape.
The present disclosure includes the following figures.
Referring to
Referring to
The transom bracket assembly 16 resides in (and extends through) an opening 19 in the transom 18 of the marine vessel and generally includes a transom housing 100, an outer portion 102 facing outside the marine vessel, and an inner portion 104 facing inside the marine vessel. The transom housing 100 is configured to be positioned in the opening 19 in the transom 18 and includes an outer end 108 configured for coupling to the drive unit 20 of the stern drive 12 and an inner end 110 configured for coupling to the powerhead 14 of the stern drive 12.
Referring to
Referring to
The outer clamp bracket 142 includes an annular rim 148 that extends around the perimeter of the opening 19 on the exterior of the transom 18 and abuts the outer surface of the transom 18. An O-ring 158 may be positioned between the annular rim 148 of the outer clamp bracket 142 and the transom 18 to form a seal therebetween. Other embodiments, however, may omit an O-ring. A support surface 150 of the outer clamp bracket 142 extends in the forward longitudinal direction from the annular rim 148 into the opening 19 along the periphery of the opening 19. Mounting holes 152 formed through the surface of the annular rim 148 are configured to receive fasteners 154 that extend through through-bores 156 formed in the transom 18. As will be discussed in further detail below in reference to
Referring to
To support the inner vibration dampener 138 on the transom bracket assembly 16, some embodiments of an inner clamp bracket 144 may be configured with a dampener mounting arrangement. For example, referring to
In the illustrated embodiments, the upper and lower port side dampener mounting brackets 166 are respectively aligned with the upper and lower starboard side dampener mounting brackets 166 such that their through-bores 170 are concentrically aligned. Some embodiments, however, may include at least one dampener mounting brackets that is not in alignment with another dampener mounting brackets. Additionally, or alternatively, an inner clamp bracket 144 may include more than four or fewer than four dampener mounting brackets, and at least one of the dampener mounting brackets may have a different shape, size, and/or position than those of the illustrated embodiments.
As previously mentioned, the transom bracket assembly 16 may include an outer vibration dampener 136 which supports the drive unit 20 and the powerhead 14 on the outer clamp bracket 142 and vibrationally isolates the drive unit 20 and the powerhead 14 relative to the outer clamp bracket 142. Referring to
As illustrated in
In some embodiments, an outer vibration dampener 136 may be configured with at least one segment 180, 182, 184 that is differently shaped and/or sized than the segments 180, 182, 184 of the illustrated outer vibration dampener 136. For example, at least one of the segments 180, 182, 184 of the outer vibration dampener 136 may have a different cross-sectional profile than at least one of the other the segments 180, 182, 184. At least one segment 180, 182, 184 of the outer vibration dampener 136 may have a cross-sectional shape that changes along the length of the segment. Additionally, or alternatively, the material composition of the outer vibration dampener 136 may vary between different segments 180, 182, 184 and/or between different portions of a segment 180, 182, 184.
Referring to
As previously mentioned, the transom bracket assembly 16 includes an inner vibration dampener 138 which is separate from the outer vibration dampener 136 and vibrationally isolates the drive unit 20 and the powerhead 14 relative to the inner clamp bracket 144. Referring to
Referring to
The mounting hardpoint 222 has a rigid body 240 with a through-bore 242 extending between opposing sides of the rigid body 240. In the illustrated embodiments, the body 240 is generally rectangular and has a length LMH that is longer than the length Los of the outer shell 220. Other embodiments, however, may be configured with at least one differently shaped mounting hardpoint 222. The elastomeric spacer 224 is configured to support the mounting hardpoint 222 within the outer shell 220 and includes a cylindrical perimeter wall 234, a hardpoint support 236 positioned concentrically within the perimeter wall 234, and at least one support member 238 extending radially between the hardpoint support 236 and the radially inner surface of the perimeter wall 234. In the illustrated embodiment, the hardpoint supports 236 are generally rectangular to correspond to the shape of the bodies 240 of the mounting hardpoints 222. One support member extends between the perimeter wall 234 and each side of the rectangular hardpoint support 236 such that there are four hardpoint supports 238 spaced around the hardpoint support 236.
In embodiments that have a differently shaped mounting hardpoint 222, the corresponding hardpoint support 236 may be shaped to match the outer profile of said mounting hardpoint 222. Additionally, or alternatively, an elastomeric spacer 224 may be configured with a different number of support members 238 extending between the perimeter wall 234 the hardpoint support 236. Further still, some embodiments may include a single, solid or substantially solid support member that formed around the hardpoint support 236 and extending radially outward to the perimeter wall 234.
Each vibration dampening mount 139 may be assembled by positioning a mounting hardpoint 222 in the hardpoint support 236 of an elastomeric spacer 224 and positioning the elastomeric spacer 224 within the through-bore 230 of an outer shell 220. Referring to
The novel transom bracket assembly 16 may be at least partially preassembled prior to installation on the transom 18 of a marine vessel. This may be useful, for example, so that the stern drive 12 can be easily and efficiently installed in a marine vessel. In some embodiments, the outer portion 102 and the inner portion 104 of the transom bracket assembly 16 may be preassembled before installation so that they may be secured to the transom 18 from the exterior of the marine vessel's hull.
The inner portion 104 may be preassembled by inserting the vibration dampening mounts 139 into the corresponding dampener mounting bracket 166 on the inner clamp bracket 144. The outer portion 102 of the transom bracket assembly 16 may be preassembled by positioning the outer vibration dampener 136 on the support surface 150 of the outer clamp bracket 142 such that the locating protrusion 151 is received in the groove 186 formed in the outer vibration dampener 136. The transom housing 100 may then be secured to the outer clamp bracket 142 by sliding the annular lip 114 of the transom housing 100 into the outer clamp bracket 142 such that an inward facing surface of the outer vibration dampener 136 abuts the annular lip 114. The clamp plate 188 is then inserted into the outer clamp bracket 142 and coupled to the transom housing 100 using the fasteners 193, and the O-ring 158 is moved into position around the outer clamp bracket 142. Additionally, or alternatively, the preassembled outer portion 102 may include the drive unit 20 secured to the transom housing 100 such that the drive unit 20 is secured to the marine vessel with the outer portion 102 of the transom bracket assembly 16. In some embodiments, however, the drive unit 20 may be secured to the transom housing 100 after the transom bracket assembly 16 is installed on the marine vessel.
Once the inner and outer portion 102, 104 have been preassembled, they may be secured to the transom 18 from the exterior of the marine vessel's hull. The assembled inner portion 104 may passed through the opening 19 in the transom 18 by rotating the inner clamp bracket 144 to fit diagonally through the opening 19. Once on the interior of the hull, the inner clamp bracket 144 may be moved into position against the inner surface of the transom 18 such that the annular rim 160 of the inner clamp bracket 144 extends around the opening. In some embodiments, lag screws may be used to temporarily hold the inner clamp bracket 144 in position prior to attachment of the outer portion 102.
The outer portion 102 of the transom bracket assembly 16 may thus be positioned in on the transom 18 by inserting the front end of the transom housing 100 through the opening such that the annular rim 148 of the outer clamp bracket 142 is pressed against an outer surface of the transom 18, thereby sandwiching the O-ring 158 between the annular rim 148 of the outer clamp bracket 142 and the outer surface of the transom 18. fasteners 154 may then be inserted through the mounting holes 152 in the outer clamp and the through-bore 156 in the transom 18 to engage the mounting holes 162 in the inner clam bracket 144, thereby coupling the transom bracket assembly to the transom 18. Fasteners 242 may then be used to couple the vibration dampening mounts 139 to the transom housing 100 so that the transom housing is supported on the inner vibration dampener 138. The powerhead 14 and the drive unit 20 (if not preassembled) may be secured to the transom bracket assembly 16 to assemble the stern drive 12.
Once the stern drive 12 is secured to the transom 18, the drive unit 20 and the powerhead 14 are suspended from the transom 18 by the outer vibration dampener 136 and the inner vibration dampener 138 (i.e., the vibration dampening mounts 139), there by vibrationally isolating the stern drive 12 from the hull of the marine vessel. The outer vibration dampener 136 isolates vibrations from the drive unit 20 to limit the transfer of the vibrations to the hull. The inner vibration dampener 138 suspend the aft portion of the powerhead 14 from the inside of the transom 18 above the bottom of the hull, further limiting vibrations transferred to the boat hull. Thus, all vibrations emanating from the stern drive must travel through the inner and/or outer vibration dampeners 136, 138 to reach the hull of the marine vessel.
In some embodiments, the outer vibration dampener 136 may be secured to the outer clamp bracket 142 and/or the transom housing 100 via an adhesive or bonding agent. For example, the outer vibration dampener 136 may be bonded to the annular lip 114 of the transom housing 100 and/or the support surface 150 of the outer clamp bracket 142 with an adhesive prior to installation of the stern drive 12 on the transom 18. By bonding the outer vibration dampener 136 to the transom housing 100 and/or the outer clamp bracket 142 prior to installation, the outer vibration dampener 136 is secured thereto in a relaxed configuration. This may be useful, for example, to provide enhanced control over (i.e., tuning of) the spring rate of the outer vibration dampener 136, and to better prevent a leak path from forming around the outer vibration dampener 136. In some embodiments, at least one of the material(s) of the outer vibration dampener 136, the shape of the outer vibration dampener 136, and/or the dimensions of the outer vibration dampener 136 may be selected based on the desired spring rate of the outer vibration dampener 136 and/or any other desired parameter thereof.
This written description uses examples to disclose the invention, including the best mode, and to enable any person skilled in the art to make and use the invention. Certain terms have been used for brevity, clarity and understanding. No unnecessary limitations are to be inferred therefrom beyond the requirement of the prior art because such terms are used for descriptive purposes only and are intended to be broadly construed. The patentable scope of the invention is defined by the claims, and may include other examples which occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have features or structural elements which do not differ from the literal language of the claims, or if they include equivalent features or structural elements with insubstantial differences from the literal languages of the claims.
This application claims priority to U.S. Provisional Application No. 63/324,251, filed Mar. 28, 2022, which is incorporated herein by reference in its entirety.
Number | Date | Country | |
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63324251 | Mar 2022 | US |