Title of Invention

THE LUBRICATING DEVICE OF THE INTERNAL COMBUSTION ENGINE

Abstract

To sufficiently lubricate the whole part of a transmission system of an internal combustion engine while adopting a simple constitution. A lubricating system for an internal combustion engine,comprising a tongue-shaped pent-roof 21 provided at an upper portion of a transmission case 3 along the axial direction of transmission shafts,and a lubricating oil supply port 22 opening at a base portion of the pent-roof 21.

Full Text

FORM 2 THE PATENTS ACT 1970 [39 OF 1970] & THE PATENTS RULES, 2003 COMPLETE SPECIFICATION [See Section 10; rule 13] "THE LUBRICATING DEVICE OF THE INTERNAL COMBUSTION ENGINE" HONDA GIKEN KOGYO KABUSHIKI KAISHA, a corporation of Japan, having a place of business at 1-1 Minamiaoyama 2-chome, Minato-ku, Tokyo, Japan. The following specification particularly describes the invention and the manner in which it is to be performed: [Detailed Description of the Invention] [0001] [Technical Field to which the Invention Pertains] The present invention relates to a lubricating system for an internal combustion engine, particularly for the inside of the transmission case. [0002] [Prior Art] As conventional lubricating systems for the inside of the transmission case of an internal combustion .engine, there are, for example, those disclosed in Japanese Utility Model Publication Nos. Hei 5-33686 and 8-3744, Japanese Patent Laid-open Nos. Hei 10-299876 and 11- 190418, and so on. These have been forced splash oil supply from the inside of transmission shafts, oil supply - from an oil sump provided on the transmission case side onto the tooth surfaces Of transmission gears, or oil supply by j e.t from an oil supply passage onto the tooth surfaces of transmission gears, or the like. [0003] [Problems to Be Solved by the Invention] All the conventional lubricating.systems for the inside of the transmission case mentioned above have a problem such as the problem of insufficient lubrication of the transmission, system as a whole or the problem of necessity for machining a complicated oil passage. 10004] [Means for Solving the Problems and Effects Thereof] In order to solve the above problems of the prior - art, the invention as set forth herein is a lubricating system for internal combustion engine, comprising a tongue-shaped pent-roof provided at an upper portion of a transmission case along the axial direction of transmission shafts, and a lubricating oil supply; port opening at a base portion of the pent-roof. [0005] . According to the invention lubricating oil supplied from the lubricating oil supply port onto the pent-roof flows down the surface" of the pent-roof while spreading along- the axial direction of the transmission shafts-and drops onto the transmission shafts, thereby sufficiently lubricating the transmission shafts over their entire length. [0006] The invention as set forth herein is characterized in that, in the invention as set forth in claim 1, -the transmission case is split in a plane intersecting with the transmission shafts, and the " lubricating oil supply port is provided at the parting surfaces. " [0007] According to the invention it is unnecessary to machine a complicated oil- . passage inside the wall o-f the transmission case or inside the shafts, so that manufacturing cost can be reduced. [0008] [Brief Description of the Drawings] [Fig. 1] Fig. ;l__is_a s.eci.ipnalview showing_one embodiment of the present invention. [Fig. 2] Fig. 2 is a view from the inside of one half (left half) of a split transmission case according to the embodiment. [Fig. 3] Similarly, Fig. 3 is a view from the inside of the other half (right half). [Fig. 4] Fig. 4 is a sectional view taken along chain line-IV-IV of Figs. 2 and 3 as viewed in the direction of arrow, after the transmission case is assembled. [Fig. 5] Similarly, Fig. 5 is a sectional view taken along chain line V-V as viewed in the direction of arrow. [Mode for Carrying Out the Invention] Fig. 1 is a sectional view showing one embodiment of the present invention. As shown in this figure, an internal combustion engine of the present embodiment includes a single-cylinder cylinder block 1, a cylinder head 2, and a transmission case 3 functioning also as a"" crankcase. A main shaft 5 which receives a rotational force from a crank shaft 4 through a primary gear not shown and an output shaft 6 which receives the rotational force of the main shaft 5 through a plurality of sets (On the side shown, four sets.) of driving gears Ml, M2, M3, M4 and driven gears CI, C2, C3, C4 are provided inside * the transmission case 3. Numeral 7 denotes a kick shaft, and 8 denotes a shift drum # [0009] Incidentally, in Fig. 1, numeral 10 denotes a connecting rod, 11 denotes a cylinder liner, 12 denotes a piston, and 13 denotes intake and exhaust valves. [0010] " In the present embodiment, a .tongue-shaped pent -roof 21 is provided at an upper portion of the • transmission case 3 along the axial direction of the transmission shafts such as the main shaft 5 and the output shaft 6. A lubricating oil supply port 22 which is the downstream end of a lubricating oil supply passage 23 is opened at a base portion of the pent-roof 21. A lubricating oil feed port 24 is provided at the upstream end of the lubricating oil supply passage 23, and is communicated with a discharge port of an oil pump which is not shown. [0011] The transmission case 3 in the present embodiment is split into left and right halves in a plane intersecting with the transmission shafts (in the example shown, a plane orthogonal to the transmission shafts). Fig. 2 is a view from the inside of one half (left half 3A) of the transmission case 3 thus split, and Fig. 3 similarly is a view from the inside of the other half (right half 3B). Fig. 4 is a sectional view taken along chain line IV-IV of Figs. 2 and 3 as viewed in the direction of arrow, after the transmission case 3 is assembled, and Fig. 5 similarly is a sectional view taken along chain line V-V as viewed in the direction of arrow. In Figs. 2 and 3, the portions decorated with double chain lines represent the left and right parting surfaces (mating surfaces) (3C in Figs. 4 and 5). [0012] As shown by these figures, the lubricating oil supply port 22 is opened at the parting surfaces (mating surfaces) 3C of the transmission case 3. The pent-roof 21 is split into a left Half 21A and a right half 21B, with the parting surfaces 3C therebetween. A lubricating oil supply groove. 23.K is cut in one. tvalf (on the side show, the left half 3A) of the split transmission case 3, and upon assembling the transmission case 3 by combining this half with the other half (on the side shown, the right half 3B) not provided with a groove, the lubricating oil supply passage 23 shown in Fig. 1 is formed. [0013] Lubricating oil fed from an oil pump which is not shown flows through tlie lubricating oil feed port 24 and the lubricating oil supply passage 23, to be supplied from the lubricating oil supply port 22 onto the upper surface of the pent-roof 21. The lubricating oil flows down the surface of tlie pent-roof 21 while spreading in the axial direction of the main shaft 5 and the output shaft 6, and drips from the lower edge of the pent-roof 21 onto the driving gears, driven gears and the like, thereby lubricating them. [0014] In the present embodiment, the tongue-shaped pent-roof 21 is provided at an upper portion of the transmission case 3. along the axial direction of the transmission shafts, and the lubricating oil supply port 22 is opened at a base portion of the pent-roof 21, so that the lubricating oil"supplied onto the pent-roof 21 spreads in the axial direction of the transmission shafts, whereby the transmission shafts are lubricated over their entire length. [0015] In the present embodiment, besides, the transmission case 3 is split in a plane intersecting with the transmission shafts, and the lubricating oil supply port 22, the lubricating oil supply passage 23 and the lubricating oil feed port 24 are provided at the parting surfaces (mating surfaces) 3C. Therefore, the lubricating oil supply passage 23 can be formed by only cutting the lubricating oil supply groove 23A or the like in one half of the split transmission case 3, and it is unnecessary to machine a complicated oil passage inside the wall of the transmission case 3 or inside the shafts. In addition, since the transmission system as a whole is thus sufficiently lubricated while using a simple constitution, it is also unnecessary to subject the transmission gears, shift forks or the like to a special surface treatment for preventing seizure. Accordingly, manufacturing cost can be reduced. [Explanation of Symbols] 1: cylinder block; 2: cylinder head; 3: transmission case; 3C: parting surface (mating surface); 4: crank shaft; 5: main shaft; 6: output shaft; 7: kick shaft; 8: shift drum; 10: connecting rod; 11: cylinder liner; 12: pis toil; 13: intake and exhaust valves; 21: pent-roof; 22: lubricating oil supply port; 23: lubricating oil supply passage; 23A: lubricating oil supply groove; 24: lubricating oil feed port; Ml, M2, M3, M4: driving gear; CI, C2, C3, C4: driven gear. WE CLAIM: 1. A lubricating device of an internal combustion engine, characterized in that the upper part of a transmission case (3) divided at a dividing plane crossing with a transmission shaft (5, 6) comprises a tongue-shaped pent-roof (21) extending in an axial direction of said transmission shaft (5, 6) across said dividing plane and connected to a side wall of each of the divided transmission cases, and a lubricant supply port (22) opened at the base part of said pent-roof (21). 2. The lubricating device of an internal combustion engine as claimed in claim 1, wherein said lubricant supply port (22) is arranged at said dividing plane and at the same time the lubricant supply passage (23) extending up to said lubricant supply port (22) is formed by a groove arranged at said dividing plane of only one of each of said divided transmission cases (3). 3. A lubricating device of an internal combustion engine substantially as herein described with reference to the accompanying drawings. Dated this 22nd day of March, 2002.

Documents:

285-mum-2002-abstract(13-12-2007).doc

285-mum-2002-abstract(13-12-2007).pdf

285-mum-2002-cancelled pages(22-03-2002).pdf

285-mum-2002-claims(granted)-(13-12-2007).doc

285-mum-2002-claims(granted)-(13-12-2007).pdf

285-mum-2002-correspondence(20-12-2007).pdf

285-mum-2002-correspondence(ipo)-(20-12-2006).pdf

285-mum-2002-drawing(26-04-2002).pdf

285-mum-2002-form 1(13-12-2007).pdf

285-mum-2002-form 13(13-12-2007).pdf

285-mum-2002-form 18(16-02-2006).pdf

285-mum-2002-form 2(granted)-(13-12-2007).doc

285-mum-2002-form 2(granted)-(13-12-2007).pdf

285-mum-2002-form 3(13-04-2004).pdf

285-mum-2002-form 3(13-12-2007).pdf

285-mum-2002-form 3(22-03-2002).pdf

285-mum-2002-form 5(22-03-2002).pdf

285-mum-2002-petition under rule 137(13-12-2007).pdf

285-mum-2002-petition under rule 138(13-12-2007).pdf

285-mum-2002-power of authority(13-12-2007).pdf

285-mum-2002-power of authority(28-05-2002).pdf

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