# US 9,752,498 B2 · Outboard motor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,752,498 B2 - Document ID: US9752498B2 - Status: Granted - Kind: B2 - Application number: 15/055,651 - Filed: 2016-02-29 - Published: 2016-12-08 - Granted: 2017-09-05 - Earliest claimed: 2015-06-03 - Assignees: Yamaha Hatsudoki Kabushiki Kaisha - Applicants: Yamaha Hatsudoki Kabushiki Kaisha - Inventors: Yuta Miyagi - Web page: https://patentgrep.com/patent/US9752498B2 ## CPC - F02B 61/045: {for marine engines} - B63H 20/001: {Arrangements, apparatus and methods for handling fluids used in outboard drives (for handling exhaust gas B63H20/24; for handling cooling-water B63H20/28; cooling outboard marine engines F01P3/202; air intakes for outboard marine engines F02M35/167)} - F02B 23/101: {the injector being placed on or close to the cylinder centre axis, e.g. with mixture formation using spray guided concepts} - F02M 37/0017: {related to fuel pipes or their connections, e.g. joints or sealings (F02M55/004 takes precedence)} - F02M 39/02: Arrangements of fuel-injection apparatus to facilitate the driving of pumps; Arrangements of fuel-injection pumps; Pump drives - F02M 55/004: {Joints; Sealings} - F02M 55/005: {for high pressure conduits, e.g. connected to pump outlet or to injector inlet} - F02M 55/025: {Common rails} - F02B 2023/102: {the spark plug being placed offset the cylinder centre axis} - F02B 2075/125: {Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber} - F02M 2200/857: characterised by mounting fuel or common rail to engine - Y02T 10/12: Improving ICE efficiencies - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - B63H: MARINE PROPULSION OR STEERING (propulsion of air-cushion vehicles B60V1/14; specially adapted for submarines, other than nuclear propulsion, B63G; specially adapted for torpedoes F42B19/00) - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An outboard motor includes a cylinder block, a cylinder head unit, a delivery pipe, a plurality of injectors, a fuel pump, and a fuel pipe. The cylinder block includes a plurality of cylinders. The cylinder head unit is connected to the cylinder block. The delivery pipe is attached to the cylinder head unit. The injectors are attached to the delivery pipe. The fuel pump is attached to the cylinder head unit. The fuel pipe is attached to the delivery pipe and the fuel pump. A first attachment direction of attaching the fuel pump to the cylinder head unit is parallel or substantially parallel to a second attachment direction of attaching the fuel pipe to the delivery pipe. ## Claims ### Claim 1 An outboard motor comprising: a cylinder block including a plurality of cylinders; a cylinder head unit connected to the cylinder block; a delivery pipe attached to the cylinder head unit; a plurality of injectors attached to the delivery pipe; a fuel pump attached to the cylinder head unit; and a fuel pipe attached to the delivery pipe and to the fuel pump; wherein a first attachment direction of attaching the fuel pump to the cylinder head unit is parallel or substantially parallel to a second attachment direction of attaching the fuel pipe to the delivery pipe. ### Claim 2 (depends on 1) The outboard motor according to claim 1, wherein each of the first and second attachment directions is parallel or substantially parallel to an axial direction of each of the plurality of cylinders. ### Claim 3 (depends on 1) The outboard motor according to claim 1, wherein each of the plurality of injectors is located in a middle or approximately a middle of each of the plurality of cylinders in a view seen from an axial direction of each of the plurality of cylinders. ### Claim 4 (depends on 1) The outboard motor according to claim 1, wherein the fuel pipe is detachable from the delivery pipe. ### Claim 5 (depends on 4) The outboard motor according to claim 4, wherein the fuel pipe is attached to the delivery pipe through an elastic seal. ### Claim 6 (depends on 5) The outboard motor according to claim 5, wherein the elastic seal includes an O-ring made of rubber. ### Claim 7 (depends on 1) The outboard motor according to claim 1, wherein the fuel pipe is detachable from the fuel pump. ### Claim 8 (depends on 7) The outboard motor according to claim 7, wherein the fuel pipe is attached to the fuel pump through an elastic seal. ### Claim 9 (depends on 8) The outboard motor according to claim 8, wherein the elastic seal includes an O-ring made of rubber. ### Claim 10 (depends on 1) The outboard motor according to claim 1, wherein the cylinder head unit includes a cylinder head and a head cover, the cylinder head is connected to the cylinder block, the head cover is connected to the cylinder head, and the fuel pump is fixed to the head cover by a fixture piece. ### Claim 11 (depends on 10) The outboard motor according to claim 10, wherein the head cover includes a recess, and the fuel pump includes a boss fitted to the recess through an elastic seal. ### Claim 12 (depends on 11) The outboard motor according to claim 11, wherein the elastic seal includes an O-ring made of rubber. ### Claim 13 (depends on 1) The outboard motor according to claim 1, wherein a first end of the fuel pipe includes a portion that is not plastically deformed and is attached to the delivery pipe; and a second end of the fuel pipe includes a portion that is plastically deformed and attached to the fuel pump. ### Claim 14 (depends on 13) The outboard motor according to claim 13, wherein the fuel pipe is attached to the delivery pipe through an elastic seal, and the fuel pipe is attached to the fuel pump by metal-to-metal contact.