JPS62168911A - Lubricating oil tank device for engine case - Google Patents

Abstract

PURPOSE:To prevent oil leakage by providing a pressure releasing groove, which communicates a lubricating oil tank with an engine case, on the contacting surfaces of a pair of case members forming the lubricating oil tank, in which oil is temporarily stored, via a common wall part formed together with the engine case. CONSTITUTION:An engine case 11 is formed by bringing a pair of case constituting members 11a and 11b into contact, and a lubricating oil tank 47 is formed inside a speed change gear chamber 21, separated from a crank chamber 19 via a partition wall 17, via a common wall part 11c formed together with the engine case 11. The oil pump 43 inside a power transmission chamber 15, after temporarily storing oil in the lubricating oil tank 47 via an oil passage 42, supplies it to the parts to be lubricated via oil passages 44. On the contacting surfaces of case constituting members 11a and 11b which are provided nearly in the central position of the lubricating oil tank 47, a pressure releasing groove 49 is provided so as to communicate the interior of the lubricating oil tank 47 with the interior of the power transmission chamber 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lubricating oil tank device in a power unit oil supply system for an engine.

[Description of prior art]

In a power unit oil supply system for an engine, oil in an oil reservoir in an engine case is supplied to a lubricated portion through a lubricating oil tank by the operation of an oil pump.

In a conventional power unit oil supply system for an engine of this kind, the engine case is of a split type in which a pair of case constituent members are in contact with each other, and the lubricating oil tank is placed inside the engine case. There is one formed through a common wall with.

[Problems with conventional technology]

However, in such a conventional engine power unit oil supply system, since the contact surface of the case component crosses the common wall, when the oil pressure in the lubricating oil tank becomes high, the lubricating oil flows from this contact surface. This has the disadvantage that it tends to leak easily.

[Means for solving the above problems]

The purpose of this invention is to eliminate the above-mentioned disadvantages, and includes an engine case having an oil reservoir at the bottom, and a lubricating oil tank for temporarily storing the lubricating oil from this oil reservoir when supplying it to the parts to be lubricated. The engine case is constructed by a pair of case constituent members facing each other and abutting each other, and the lubricating oil tank is installed inside the engine case via a common wall with the engine case. In the power unit water supply device, the abutting surfaces of the case constituent members cross the common wall portion, and a pressure relief groove is formed in the abutting surfaces of the pair of case constituent members in the common wall portion. This was further achieved by communicating this pressure relief groove into the engine case.

[Action of the invention]

The lubricating oil tank device for an engine case according to the present invention includes:
With the above structure, even if the oil pressure in the lubricating oil tank becomes high and lubricating oil enters the contact surface of the case component, this lubricating oil will be collected in the pressure relief hole, and then the engine returned to the case.

[Explanation of Examples]

Hereinafter, the present invention will be explained in detail based on FIGS. 1 and 2.

In FIG. 1, reference numeral 11 denotes an engine case, which is formed by bringing a pair of case constituent members 11a and 11b into contact with each other. This engine case 11 has a bulkhead 13
A small chamber is divided into a power transmission chamber 15 through a partition wall 17, and a large chamber is further divided into a crank chamber 19 and a transmission chamber 21 through a partition wall 17 (see FIG. 2). Further, 23 is a through hole, which is bored in the lower part of the partition wall 13. This through hole 2
3 communicates the bottom of the transmission chamber 21 with the bottom of the power transmission chamber 15; in other words, the oil reservoir 0 of the transmission chamber 21 is extended to the power transmission chamber 15.

A piston 25 moves back and forth within a cylinder that is integrally formed with the crank chamber 19. Further, 27 is a connecting rod, which connects the piston 25 and the crankshaft 29. The forward and backward movement of the piston 25 is transmitted to the engine shaft 31 as rotational movement by the connecting rod 27 and the crankshaft 29.

33 is a driving gear, which is fixed to the engine shaft 31 protruding into the power transmission chamber 15. This driving gear 33 transmits rotational force to the primary side of a clutch 35 installed in the power transmission chamber 15. 37 is a main shaft of a transmission connected to the secondary side of the clutch 35, and is installed in the transmission chamber 21. Further, 39 is a pair of shafts of the transmission, which is installed in the transmission chamber 21 in parallel with the main shaft 37. This pair of shafts 39 and the main shaft 37 are interlocked by a speed change gear 41 as appropriate.

Next, 43 is an oil pump, which is installed in the power transmission chamber 15. This oil pump 43 is connected to the power transmission chamber 1
/rA of oil sump 0 in 5 (see Figure 1)? h oil is temporarily stored in a lubricating oil tank 47 (described later) via an oil passage 42, and then transferred to a lubricated part (transmission main shaft 37) via an oil passage 44.
, the opposite shaft 39, etc.). Note that 45 is an intervening gear (see FIG. 1), which transmits the rotation of the engine shaft 31 to the oil pump 43.

Next, 47 is a lubricating oil tank, which is formed in the transmission chamber 21 via a common wall portion 11c with the engine case 11. This lubricating oil tank 47 is the case component member 11a.
, 11b are located approximately in the center. That is, this contact surface crosses the common wall portion 11c.

Reference numeral 49 denotes a pressure relief groove, which is formed on the contact surface of the case constituent members 11a and llb in the common wall portion 11c.

This pressure relief groove 49 communicates with the inside of the power transmission chamber 15 (see FIG. 2). Note that the pressure relief groove 49 can also be formed on the contact surface of one of the case members 11a and llb.

〔Effect of the invention〕

The lubricating oil tank device for an engine case according to the present invention includes:
Because of the above structure, even if the oil pressure in the lrA lubricant tank becomes high and lubricant enters the contact surface of the case component, this lubricant will be collected in the pressure relief hole, and then the engine It is returned to the case.

Therefore, in this device, the lubricating oil is supplied from the lubricating oil tank to the common wall portion (the common wall portion of the engine case and the lubricating oil tank) to the abutting surface (the abutting surface of the pair of case constituent members).
It will not leak outside the engine case.

[Brief explanation of drawings]

1 and 2 show an embodiment of a lubricating oil tank device for an engine case according to the present invention. FIG. 1 is a longitudinal sectional view, and FIG. 2 is a sectional view taken along the line FIG. 3 is a diagram showing the main parts. 0 ...... Oil sump 11 ...... Engine case 11a,
llb... Case component 11c...
・ Common wall part 37, 39... Oil supplied part (37... Main shaft, 39... Opposite shaft) 43... Oil pump 47 ・
...... Lubricating oil tank 49 ......
... Pressure relief groove patent applicant: Yamaha Motor Co., Ltd. agent, patent attorney Yuji Nosue No. 1
Figure 2

Claims (1)

[Claims] (1) An engine case having an oil reservoir at the bottom, and a lubricating oil tank for temporarily storing lubricating oil in the oil reservoir when supplying it to a lubricated part, and the engine case has a pair of case constituent members. In the engine power unit lubricating device, the lubricating oil tank is installed in the engine case through a common wall with the engine case, and the lubricating oil tank is installed in the engine case through a common wall with the engine case, the case configuration being The abutment surfaces of the members cross the common wall, and a pressure relief groove is formed in the abutment surface of the pair of case constituent members on the common wall, and further, this pressure relief groove is formed within the engine case. lubricating oil tank device in the engine case that communicates with the engine case.