JPS6315526Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] (Industrial application field) This invention distributes and pressure-feeds oil pumped from the oil pan at the bottom of the engine case to multiple lubricated mechanisms such as bearings. The present invention relates to a lubricating device such as a transmission mechanism in an engine.

(Prior art) In an engine that employs a forced oil feeding method to lubricate various parts of the engine, for example, as shown in FIG. , valve mechanism 3, crank mechanism 4, countershaft mechanism 7,
The oil is supplied to the speed change gear mechanism 5 including the drive shaft mechanism 6 via an oil line 8. If this oil line 8 is mechanically in contact with the oil seal,
For example, in a counter shaft or a drive shaft, the oil line is arranged from the end of the shaft to the center of the shaft, so there is a risk that oil pressure will be applied to the side surface of the oil seal, causing oil leakage. For this reason, an orifice 9 is inserted into the inlet and the hydraulic pressure is set at a maximum of about 4 kg/cm ² to prevent oil leakage.

(Problem that the invention aims to solve) However, in the conventional lubrication system as described above, when starting in a cold region, the viscosity of the oil is high and the oil pressure becomes abnormally high, causing oil leakage. An undesirable situation occurs. It is possible to prevent this by setting the orifice diameter even finer, but this would have side effects such as dust clogging, making it difficult to adopt.

This idea was designed to prevent the above-mentioned problems, and was designed to prevent the generation of abnormally high pressure by adding some innovations to the oil line, while also improving the transmission mechanism in the engine to ensure lubrication performance under normal conditions. The purpose is to provide a lubricating device.

[Structure of the idea]

(Means for solving the problem) This idea is a forced lubrication oil line that supplies oil pumped by a pump to sliding parts around the crankshaft, camshaft, countershaft, drive shaft, etc. In this case, a discharge line is branched at the entrance to the lubricated mechanism located at the end of the line, and this discharge line extends upward, and its tip is connected to the engine case at a position higher than the lubricated mechanism. It is something that is opened within.

(Function) Therefore, according to the lubricating device such as the transmission mechanism in an engine according to this invention, when the viscosity of the oil is high, the oil flows from the bottom to the top of the discharge line, and the oil flows from the tip of the discharge line to the engine case. to prevent abnormally high pressure.
Furthermore, when the viscosity of the oil decreases, the height of the discharge line becomes a head effect, and oil pressure based on the head effect appropriately supplies oil to the lubricated mechanism to ensure lubrication performance.

(Embodiments) Hereinafter, preferred embodiments of a lubricating device such as a transmission mechanism in an engine according to this invention will be described.

FIG. 2 shows an outline of a lubricating device such as a transmission mechanism in an engine according to this invention.
A discharge line 10 is provided in a branched manner. This discharge line 10 extends upwardly, and the distal end 10a of the discharge line 10 is opened into the engine case at a position higher than the lubricated mechanism of the drive shaft mechanism 6 by a height H. This discharge line 10
This prevents abnormally high pressure and prevents oil from leaking from the oil seal. Then, as the oil warms up and its viscosity decreases, the height of the discharge line 10 becomes a head effect, causing the drive shaft mechanism 6 and counter shaft 7 to
The lubrication function is now supplied with oil, and there is no problem with the lubrication function. When the head height of the discharge line 10 is set to 60m/m, the oil pressure is suppressed to 0.06Kg/ ^cm2 or less,
There is no need to worry about oil leakage, and the lubrication function is ensured. The oil discharged in the discharge line 10 returns directly to the oil pool.

Next, an embodiment of this invention is shown in more detail in FIG. 3 and below.

FIG. 3 is a side view of a split engine case, which is constructed by joining an upper case 11a and a lower case 11b. 12a, 13a, and 14a are bearing holes for the crankshaft, countershaft, and drive shaft, respectively. The bearing holes on the opposite side are represented by 12b, 13b, and 14b.

A part of the oil line opens at the lower part of the counter bearing hole 13b through an oil passage 15 that ascends from the bottom of the lower case 11b through the thickness of the case, and is formed in an arc-shaped groove along the circumferential direction provided in the bearing hole 13b. Leads to 16. In the bearing hole 13b, as shown in FIG.
Roller bearing 1 that supports the end of counter shaft 17
The outer race 19 of No. 8 is fitted, and an oil hole 20 passing through the outer race 19 is provided in communication with the groove 16. The oil hole 20 communicates with the inside of the roller bearing 18 and further communicates with an oil hole 22 drilled in the shaft center via an oil reservoir 21 on the end surface of the counter shaft 17.
An oil hole 23 communicating with the outer surface of the shaft is arranged to supply oil to each part of the lubricated mechanism. 24 is a clutch rod inserted into the oil hole 22, and 25 is an oil seal.

On the other hand, the groove 16 is connected to a groove 27 that traverses the mating surface 26 and reaches the drive bearing hole 14b.
This groove 27 is the drive bearing hole 1 of the upper case 11a.
4b, and further into the upper case 1.
The oil passage 29 extends upward through the thick part of the bearing hole 1a, crosses the upper part thereof in the axial direction, and then descends to communicate with an oil passage 29 led to the upper part of the bearing hole 14a. The lower end of the oil passage 29 is connected to a circumferential groove 30 of the bearing hole 14a. As shown in FIG. 7, an outer race 33 of a roller bearing 32 that pivotally supports one end of the drive shaft 31 is fitted into the bearing hole 14a, and an oil hole 34 passing through the outer race 33 communicates with the groove 30. There is an oil reservoir 35 inside the roller bearing 32, and oil is supplied to an oil hole 36 provided at the axial center of the drive shaft 31.

The above is the oil line that has been installed conventionally, and in this invention, the discharge line is installed as follows. That is, the groove 30 goes half around the bearing hole 14a of the lower case 11b, and also communicates with a groove 37 that reaches the upper part of the bearing hole 14a of the upper case 11b, and extends from the end of the groove 37 upward through the thick part of the upper case 11a. It is connected to a discharge passage 38 that rises up. The discharge passage 38 is opened into the case at the upper part of the upper case 11a. The open end 38a is set at a higher position than the lubricated portion around the drive shaft 31.

With this configuration, the counter shaft 1
7 and the sliding parts of the drive shaft 31, if the viscosity of the oil is high at the time of a cold start, the flow resistance increases and the oil pressure increases accordingly, causing the oil at the end of the counter shaft that is in contact with it to increase in viscosity. Although oil leaks from the seal 25, the oil is discharged into the case from the discharge passage 38, so that the oil pressure in the oil reservoir 21 in contact with the oil seal 25 is not increased and no oil seal leak occurs.

Furthermore, when the temperature inside the case rises and the viscosity of the oil decreases, oil continues to be discharged from the discharge passage 38, but due to the oil pressure due to the head effect of the discharge passage 38, necessary parts of the counter shaft 17 and the drive shaft 31 are Oil supply has started and lubrication performance is not affected.

Furthermore, since it has a simple structure that only requires the provision of the discharge passage 38, there is no increase in cost, and it is extremely useful as a forced-pressure feeding type lubricating device.

[Effect of idea]

As described above, the lubricating device such as the transmission mechanism in the engine according to this invention is provided with a branched discharge line at the inlet to the lubricated mechanism located at the end of the oil line, and this discharge line rises upward. Since the tip of the discharge line is opened into the engine case at a position higher than the lubricated mechanism, there is no abnormal increase in oil pressure beyond the oil pressure due to the head effect, and oil leakage does not occur. In addition, suitable lubrication performance under normal conditions can be ensured by hydraulic pressure based on the head effect.

[Brief explanation of the drawing]

Figure 1 is an oil line system diagram for conventionally used forced-pressure lubrication, Figure 2 is an oil line system diagram showing an example of a lubrication device such as a transmission mechanism in an engine according to this invention, and Figures 3 and below. 3 shows this embodiment in more detail, FIG. 3 is a side view of the engine case, FIG. 4 is a bottom view of the main part of the engine case shown in FIG. 3, and FIG. 5 is a plan view of the main part of the lower case. Figure 6 is a cross-sectional plan view of the end of the counter shaft;
The figure is a cross-sectional plan view of the end of the drive shaft. DESCRIPTION OF SYMBOLS 1... Pump, 3... Valve train mechanism, 4... Crank mechanism, 5... Speed change gear mechanism, 8... Oil line, 10... Discharge line, 13a, 13b... Counter bearing hole, 14a, 14b... ... Drive bearing hole, 15, 29 ... Oil passage, 17 ... Counter shaft, 31 ... Drive shaft, 38 ... Discharge passage.

Claims (1)

[Scope of utility model registration request] In forced lubrication oil lines that supply oil pumped by a pump to sliding parts around the crankshaft, camshaft, countershaft, drive shaft, etc., to the lubricated mechanism located at the end of the line. A transmission line in an engine characterized in that a discharge line is branched at the inlet of the engine, the discharge line extends upwardly, and its tip is opened into the engine case at a position higher than the lubricated mechanism. Lubricating devices for mechanisms, etc.