Lubrication Oil Pump Drive Mechanism for IC Engines

Field of invention:

The present invention relates to a lubricating oil pump drive for a single cylinder internal combustion engine and more particularly to an improved arrangement for the driving components of the lubricating oil pump drive for the internal combustion engine.

Background of the invention:

Internal combustion engine is provided with an-oil pump for sucking oil in an oil pan and sending it under pressure to lubricate and cool the parts of engine. Oil is circulated by the oil pump to lubricate and cool the parts of engine. The oil is stored in the oil pan under the internal combustion engine, supplied to the parts of engine and returned to the oil pan after achieving the lubrication and cooling of the parts of internal combustion engine.

In the known internal combustion engines, the lubrication oil pump drive arrangements are made to ensure the oil supply in the internal-combustion engine by means of gear pumps or internally-geared rotor pumps. Such known oil pump drives are expensive because they require corresponding transmission members, require additional installation space. Furthermore, internally-geared rotor-pump arrangements are known in which the inner rotor is pressed onto the crankshaft and is mounted in the oil-pump housing together with the outer rotor, which leads to a complicated drive mechanism.

The known oil pump drive by gear increases the size of the engine, and \n some cases the gear drive does not permit directional change and this increases addition of gear for changing direction. If the oil pump is driven through an intermediate shaft rather than directly by the crankshaft, the overall arrangement require additional installation space, and hence, the size and cost of the oil pump drive arrangement is increased which leads to unwanted increase in engine size and cost.

Hence it is an object of the present invention to provide an improved oil pump drive for an internal combustion engine which enables for a simple positive drive with reduction in the size of the engine.

Object of the invention:

The main object of the present invention is to provide an improved oil pump drive for an internal combustion engine which enables for a simple positive drive with reduction in the size of the engine.

Another object of the present invention is to provide a simple and inexpensive oil pump drive connection for an internal combustion engine.
It is a further object of the present invention to provide a continuous chain drive arrangement through the first chain wheel fitted on the oil pump rotor shaft and the second chain wheel fitted on the engine clutch housing on the clutch shaft.

Summany:

The present invention relates to an internal combustion engine which mounts crankcase and a Crankshaft assembly housed in the said crankcase of the internal combustion engine. A clutch shaft assembly is connected to crankshaft assembly by means of a gear for meeting the drive and transmission requirements. A drive shaft is mounted on the adjacent axis of the crankcase and is respectively connected to clutch shaft. The gear final drive and differential assembly is mounted on another axis of crankcase and is connected to drive shaft through another set of gears.

The present invention provides an improved single cylinder engine having a crankshaft and clutch shaft assembly. A first chain wheel is press fitted on to the oil pump rotor shaft; the first chain wheel is driven by a second chain wheel through a continuous drive chain. The second chain wheel is fitted on to the clutch housing on the clutch shaft of the internal combustion engine. The rotor shaft of the oil pump is driven directly by the continuous chain drive arrangement through the first chain wheel fitted on the oil pump rotor shaft and the second chain wheel fitted on the clutch housing.
The chain wheels can transmit torque from the clutch shaft in the clutch housing to the oil pump rotor shaft through the continuous chain connecting the first chain wheel in oil pump and the second chain wheel in the clutch housing. This allows for providing a simple positive connection between the oil pump rotor shaft and the engine clutch shaft, thus providing a simple and inexpensive drive connection of the oil-pump rotor shaft and the engine clutch shaft through the first and second chain wheel and the continuous chain.

Detailed Description:

The present invention eliminates the above-described disadvantages, and provides an oil pump drive for an internal combustion engine having a continuous driving chain for connecting an oil pump drive chain wheel to an engine clutch shaft. The oil pump is driven by the rotation force from the engine clutch shaft.
The present invention relates to an internal combustion engine which mounts crankcase and a Crankshaft assembly housed in the said crankcase of the internal combustion engine. A clutch shaft assembly is connected to crankshaft assembly by means of a gear for meeting the drive and transmission requirements. A drive shaft is mounted on the adjacent axis of the crankcase and is respectively connected to clutch shaft. The gear final drive and differential assembly is mounted on another axis of crankcase and is connected to drive shaft through another set of gears.

Referring to Figure 1 and according to the present invention, the improved single cylinder engine includes a crankshaft and clutch shaft assembly. A first chain wheel (101) Is press fitted on to the oil pump rotor shaft (104); the first chain wheel (101) is driven by a second chain wheel (102) through a continuous drive chain (109). The second chain wheel (102) is fitted on to the clutch shaft (110) In the clutch housing (103) of the internal combustion engine. The continuous chain (109) is set around the oil pump drive chain wheel (101) and the clutch shaft drive chain wheel (102).

The rotor shaft (104) of the oil pump is driven directly by the continuous chain drive (109) arrangement through the first chain wheel (101) fitted on the oil pump rotor shaft (104) and the second chain wheel (102) fitted on the clutch housing (103).

The chain wheels can transmit torque from the clutch shaft (110) In the clutch housing (103) to the oil pump rotor shaft (104) through the continuous chain (109) connecting the first chain wheel (101) in oil pump and the second chain wheel (102) in the clutch housing (103). The oil pump sucks the oil in the oil pan through a suction pipe and sends the oil to the parts of the internal combustion engine under pressure by the rotation of the pump shaft.
The continuous chain (109) drive arrangement through the first chain wheel (101) fitted on the oil pump rotor shaft (104) and the second chain wheel (102) fitted on the engine clutch allows for providing a compact and positive drive arrangement, and hence reducing the size of the engine.

The lubrication oil pump drive mechanism of the present invention allows for providing a simple connection between the oil pump rotor shaft (104) and the engine clutch shaft (110), thus reducing the numbers of parts for the oil pump drive arrangement, and thereby reducing the cost of pump arrangement and the cost of the engine.
Although this invention has been described in terms of a certain preferred embodiment, other embodiments apparent to those of ordinary skill in the art are also within the scope of this invention. Accordingly, the scope of the invention is intended to be defined only by the claims that follow.

Claim;

1. A lubrication oil pump drive mechanism for internal combustion engine comprises of:

a first chain wheel fitted on to the oil pump rotor shaft; and

a second chain wheel fitted on to the clutch housing,

wherein the first chain wheel is driven by the second chain wheel through a continuous drive chain.

2. The lubrication oil pump drive mechanism for internal combustion engine as claimed in claim 1, wherein the said second chain wheel is press fitted on clutch housing.

3. The lubrication oil pump drive mechanism for internal combustion engine as claimed in claim 1, wherein the said second chain wheel sprocket is preferably made up of metal with inverted T section.

4. The lubrication oil pump drive mechanism for internal combustion engine as claimed in claim 3, wherein the tooth is cut on Inverted T section.

5. The lubrication oil pump drive mechanism for internal combustion engine as claimed in claim 1, wherein the said continuous drive chain is roller type or similar.

6. The lubrication oil pump drive mechanism for internal combustion engine as claimed in claim 1, wherein the said second chain wheel sprocket is substantially larger than the driven sprocket.