Lubricating device of internal combustion engine

Patent metadata

Field	Value
Publication number	US-9926819-B2
Application number	US-201615065406-A
Country	US
Kind code	B2
Filing date	Mar 9, 2016
Priority date	Mar 27, 2015
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

In a lubricating device of an internal combustion engine having a crank chamber and a transmission chamber, which is arranged in the rear of the crank chamber so as to accommodate therein a gear transmission provided with a main shaft and a pump shaft. The pump shaft is shared by a scavenging pump and a feed pump for feeding oil to a part to be lubricated and to which motive power from the crank shaft is transmittable. An axis of the pump shaft is arranged below an axis of the main shaft. A pump gear located on the pump shaft meshes directly with a primary driven gear, which meshes with a primary drive gear located on the crank shaft so as to form a primary gear reduction mechanism in cooperation with the primary drive gear.

First claim

What is claimed is:

1. A lubricating device of an internal combustion engine comprising: a crankcase constituting a part of an engine main body that is mounted on a vehicle and rotatably supporting a crank shaft; a crank chamber being formed in the crankcase; a transmission chamber being formed in the crankcase and arranged in the rear of the crank chamber in a vehicle front-to-rear direction so as to accommodate therein a gear transmission provided with a main shaft to which motive power from the crank shaft is inputted; and a pump shaft that is shared by a scavenging pump for pumping oil out of the crank chamber and a feed pump for feeding the oil to a part to be lubricated and to which the motive power from the crank shaft is transmitted; wherein an axis of the pump shaft is arranged below an axis of the main shaft in a vehicle height direction, and a pump gear located on the pump shaft meshes directly with a primary driven gear, the primary driven gear meshes with a primary drive gear located on the crank shaft so as to form a primary gear reduction mechanism in cooperation with the primary drive gear and the primary driven gear is arranged coaxially with the main shaft, the primary driven gear having a diameter greater than a diameter of the primary drive gear; and a discharge port arranged rearward in the vehicle front-to-rear direction of a lower end in the vehicle height direction of a rotation locus of an outer circumference of a crank web and located at the same level in the vehicle height direction with the lower end of the rotation locus, wherein the discharge port is provided in the crankcase so as to discharge the oil from the crank chamber, the scavenging pump has at least a portion located in front in the vehicle front-to-rear direction of the rear of the crank chamber, and the scavenging pump is arranged in a rear in the vehicle front-to-rear direction of the discharge port in the crankcase.

2. The lubricating device of an internal combustion engine according to claim 1 , further comprising a recessed wall portion having a lower outer circumferential surface in the vehicle height direction that serves as a portion of an upper wall in the vehicle height direction of an oil sump formed in a lower part in the vehicle height direction of an interior of the crankcase, wherein the recessed wall portion is provided in the crankcase and forms a recess for accommodating the scavenging pump therein, and a lower end in the vehicle height direction of the recessed wall portion is arranged in a higher position than an oil inflow port to the oil sump.

3. The lubricating device of an internal combustion engine according to claim 1 , further comprising an oil discharge passage for leading the oil discharged from the scavenging pump, wherein the oil discharge passage is located in the crankcase, and provided at an upper end in the vehicle height direction of the oil discharge passage is an outflow port that opens into the transmission chamber above the main shaft.

4. The lubricating device of an internal combustion engine according to claim 3 , wherein the oil discharge passage comprises at least a vertically extending linear oil passage that extends linearly in the vehicle height direction and has an upper end connected to the outflow port, the vertically extending linear oil passage arranged to cross a drive gear constituting a portion of the gear transmission and arranged coaxially with the main shaft.

5. The lubricating device of an internal combustion engine according to claim 4 , further comprising a relief valve for ejecting oil to the drive gear from below in the vehicle height direction in a spraying manner when a pressure within the oil discharge passage is beyond a predetermined pressure, wherein the relief valve is provided in an intermediate portion of the oil discharge passage.

6. The lubricating device of an internal combustion engine according to claim 3 , wherein the outflow port comprises a through hole that is formed in a wall portion facing the transmission chamber of the crankcase, the through hole in communication with the upper end of the oil discharge passage, and wherein a guide wall for guiding the oil from the outflow port to a gear meshing portion of the gear transmission is formed integral with the crankcase, and an opposed guide plate, which is arranged along a portion of the guide wall so as to be opposed to an outer end of the outflow port, is fastened to the crankcase.

7. The lubricating device of an internal combustion engine according to claim 2 , further comprising an oil discharge passage for leading the oil discharged from the scavenging pump, wherein the oil discharge passage is located in the crankcase, and provided at an upper end in the vehicle height direction of the oil discharge passage is an outflow port that opens into the transmission chamber above the main shaft.

8. The lubricating device of an internal combustion engine according to claim 7 , wherein the oil discharge passage comprises at least a vertically extending linear oil passage that extends linearly in the vehicle height direction and has an upper end connected to the outflow port, the vertically extending linear oil passage arranged to cross a drive gear constituting a portion of the gear transmission and arranged coaxially with the main shaft.

9. The lubricating device of an internal combustion engine according to claim 8 , further comprising a relief valve for ejecting oil to the drive gear from below in the vehicle height direction in a spraying manner when a pressure within the oil discharge passage is beyond a predetermined pressure, wherein the relief valve is provided in an intermediate portion of the oil discharge passage.

10. The lubricating device of an internal combustion engine according to claim 4 , wherein the outflow port comprises a through hole that is formed in a wall portion facing the transmission chamber of the crankcase, the through hole in communication with the upper end of the oil discharge passage, and wherein a guide wall for guiding the oil from the outflow port to a gear meshing portion of the gear transmission is formed integral with the crankcase, and an opposed guide plate, which is arranged along a portion of the guide wall so as to be opposed to an outer end of the outflow port, is fastened to the crankcase.

11. The lubricating device of an internal combustion engine according to claim 5 , wherein the outflow port comprises a through hole that is formed in a wall portion facing the transmission chamber of the crankcase, the through hole in communication with the upper end of the oil discharge passage, and wherein a guide wall for guiding the oil from the outflow port to a gear meshing portion of the gear transmission is formed integral with the crankcase, and an opposed guide plate, which is arranged along a portion of the guide wall so as to be opposed to an outer end of the outflow port, is fastened at one place to the crankcase.

Assignees

• Honda Motor Co Ltd

Inventors

• Hatae Ryo
• Omori Kohei
• Nakano Kenichi

Classifications

• F01M2001/0269

  driven by the crankshaft · CPC title

• F16H57/0456

  Lubrication by injection; Injection nozzles or tubes therefor (oil mist or spray lubrication F16H57/0458) · CPC title

• F01M1/04

  using pressure in working cylinder or crankcase to operate lubricant feeding devices · CPC title

• F01M2001/0238

  Rotary pumps · CPC title

• F01M1/12

  Closed-circuit lubricating systems not provided for in groups F01M1/02 - F01M1/10 · CPC title