JP2003090201A - Lubricating oil supply device for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem on a conventional engine that the direction of jetting a lubricating oil from a supporting shaft into a gear case is at an angle to a gear surface to cause the lubricating oil to hardly reach other gears. SOLUTION: The lubrication of a gear part is accomplished by supplying the lubricating oil to the supporting shaft 22 of an idle gear 23 stored in the gear case 3 and rotated by a crank shaft 20 and jetting the oil from the supporting shaft 22 into the gear case 3. The lubricating oil is jetted from the supporting shaft 22 into the gear case 3 in the radial direction of the gear.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a lubricating oil supply device for an engine.

[0002]

2. Description of the Related Art Conventionally, in an engine composed of a cylinder block and a gear case, the engine is housed in a gear case,
BACKGROUND ART A technique is known in which lubricating oil is supplied to a support shaft of an idle gear that is driven to rotate by a crankshaft, and the lubricating oil is jetted from the support shaft into a gear case to inject oil into a gear portion. In this engine, as shown in FIG. 7, an idle gear 51 is rotatably supported by an idle shaft 50 via a bush 52, and the idle shaft 50 is provided with a lubricating oil passage formed in a cylinder block. A communication passage 50a is formed which communicates with the outer peripheral surface of the idle shaft. Further, the bush 52 has a communication hole 5 communicating with the communication passage 50a.
2a is formed, and the idle gear 51 is formed with an ejection hole 51a that can communicate with the communication hole 52a. The ejection hole 51a is opened toward the outer peripheral direction of the idle gear 51 on the gear case cover side, and the lubricating oil pressure-fed in the lubricating oil passage is ejected through the communication passage 50a and the communication hole 52a. It is configured so that it can be spouted from, and the gear portion is lubricated.

[0003]

However, in the conventional engine, the direction in which the lubricating oil is ejected from the support shaft into the gear case has an angle with respect to the gear surface, so that it reaches other gears. There was a problem that it was difficult. In addition, since it is necessary to drill holes in the idle gear, and a hole for lubrication between the idle gear and the support shaft and a hole for lubricating oil to the lubricating oil supply section were formed, processing costs and machining man-hours are increased. There was a problem that was increased.

[0004]

The problem to be solved by the present invention is as described above, and the means for solving this problem will be described below.

That is, according to the first aspect of the invention, the lubricating oil is supplied to the support shaft of the idle gear housed in the gear case and driven and rotated by the crankshaft, and the lubricating oil is jetted from the support shaft into the gear case. In this configuration, the lubricating oil is jetted from the support shaft into the gear case in the radial direction of the gear.

According to a second aspect of the present invention, the lubricating oil supplied to the support shaft is provided on the outer peripheral surface of the support shaft through the lubricating oil supply passage, and the inner periphery of the bush interposed between the idle gear and the support shaft. It is configured to be guided to the lubricating oil jetting portion of the support shaft through the groove formed on the surface.

According to a third aspect of the present invention, a flange portion is formed at an outer end of the support shaft so as to abut a gear surface of the idle gear, and the gear contact surface of the flange portion is provided with a lubricating oil jet portion of the support shaft. A certain groove is formed.

According to a fourth aspect of the present invention, a groove on the inner peripheral surface of the bush is a first groove which is connected to a lubricating oil supply passage of the support shaft and is formed in the circumferential direction, and a lubrication of the first groove and the support shaft. It is formed by a second groove which is connected to the oil ejection portion and is formed in a substantially axial direction.

In the present invention, one or a plurality of the second grooves are formed.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described. 1 is a side sectional view of an engine according to the present invention, FIG. 2 is a front view showing a gear case portion, FIG. 3 is a perspective view of an idle shaft, FIG. 4 is a plan view thereof, FIG. 5 is a side sectional view thereof, and FIG. Is a development view of the bush, and FIG. 7 is a side sectional view of a conventional idle shaft.

First, the schematic construction of an engine in which the lubricating oil supply apparatus of the present invention is constructed will be described with reference to FIG. A cylinder head is attached to an upper end portion of a cylinder block 2 of the engine 1, and a valve arm chamber is formed above the cylinder head.

A gear case 3 is connected to one side surface of the cylinder block 2 for accommodating a gear for transmitting the driving force from the crankshaft 20 to a camshaft, a fuel injection pump, and the like. A gear case cover 4 for housing the lubricating oil pump 10 is connected to the outer surface of the gear case 3. The gear case 3 and the gear case cover 4 form a gear case portion. A flywheel housing 11 that accommodates a flywheel is connected to the other side surface of the cylinder block 2.

An oil pan 5 is provided below the cylinder block 2, and lubricating oil is stored in the oil pan 5. The oil pan 5 is connected to the cylinder block 2 via a spacer 6.

A lubricating oil suction passage 13 which is a lubricating oil passage is formed in the spacer 6 and communicates with a lubricating oil suction pipe 14 which projects from the spacer 6 into the oil pan 5. The lubricating oil stored in the oil pan 5 is the lubricating oil suction pipe 1
4 and the lubricating oil suction passage 13 are sucked into the lubricating oil pump 10.

Next, the aforementioned gear case will be described with reference to FIGS. 2 to 6. The gear case 3 has a crankshaft 2
Crank gear 21 driven by 0, idle shaft 22
Idle gear 23 supported by the fuel injection pump cam shaft 24 supported by the fuel injection pump gear 2
5, a cam gear 27 supported by the cam shaft 26 of the engine 1, a hydraulic pump gear 29 supported by a hydraulic pump drive shaft 28 for external hydraulic pressure, and the like are provided.

The idle gear 23 meshes with the crank gear 21, the fuel injection pump gear 25 and the cam gear 27 mesh with the idle gear 23, and the hydraulic pump gear 29 meshes with the cam gear 27. The cam gear 27 and the cam shaft 24 are driven by the crankshaft 20 via the idle gear 23, and the hydraulic pump gear 29 via the idle gear 23 and the cam gear 27.

The idle gear 23 is rotatably supported by the idle shaft 22 via a bush 30, and the idle shaft 22 is provided with a plurality of fastening members 31, 31 ,.
Is fastened to the cylinder block 2, and the bush 30 is fixed to the idle gear 23. The idle shaft 22
Includes a lubricating oil passage 2a formed in the cylinder block 2.
And a communication passage 22a that communicates with the outer peripheral surface of the idle shaft 22.
Are formed.

Furthermore, at the outer end of the idle shaft 22,
Flange portion 22 that abuts the gear side surface of the idle gear 23
b is formed. A groove 22c is formed in the radial direction on the gear contact surface side of the flange portion 22b, and a lubricating oil jetting portion is formed by the groove 22c and the idle gear 23. Therefore, it is possible to reduce the thickness of the idle gear portion, and it is not necessary to form a hole in the idle gear as in the conventional case, and it is possible to reduce the processing cost and the number of processing steps. Further, the cross-sectional area of the lubricating oil jetting portion is constant, the amount of lubricating oil supplied is stable, and uniform lubrication is possible.

Further, on the inner peripheral surface of the bush 30, there is formed a first groove 30a which is connected to the communication passage 22a which serves as a lubricating oil supply passage of the idle shaft 22 and which is formed in the circumferential direction, and the first groove 30.
A second groove 30b is formed which connects a and the groove 22c of the flange portion 22b and is formed in a substantially axial direction. Accordingly, in the conventional art, as shown in FIG. 7, the idle shaft 50 has a lubricating hole 50 for the idle gear 51 and the idle shaft 50.
Although it was necessary to form b and the hole 50a for supplying the lubricating oil to the ejection hole 51a, it is possible to lubricate the idle gear 23 and the idle shaft 22 and to supply the lubricating oil to the ejection portion at the same time. Therefore, the drilling of the idle shaft 22 can be reduced.

Then, the lubricating oil pressure-fed in the lubricating oil passage 2a is the communicating passage 22a, the first groove 30a, and the second groove 3
0b and the groove 22c of the flange portion 22b, the idle gear 23 is rotationally driven by the crank gear 21, and the groove 22c of the flange portion 22b of the idle shaft 22 and the second groove of the bush 30. Thirty
When the phase in the circumferential direction coincides with b, the communication passage 22a of the idle shaft 22, the first groove 30a, and the second groove 30b.
And the groove 22c communicate with each other so that the lubricating oil is ejected into the gear case 3.

In such a structure, the idle shaft 22
Since the direction in which the lubricating oil is jetted from the inside to the gear case 3 is the radial direction of the gear, the lubricating oil reliably reaches the gear portion, so that the lubricating efficiency is improved and sufficient lubrication can be performed. In addition, the lubricating oil supplied to the idle shaft 22 is formed on the inner peripheral surface of the bush 30 interposed between the idle gear 23 and the idle shaft 22 from the communication passage 22a opening to the outer peripheral surface of the idle shaft 22. Through the formed first groove 30a and second groove 30b, the flange portion 22b of the idle shaft 22.
Since the lubricating oil passage 2a and the jet portion are not directly connected to each other, the lubricating oil does not suddenly jump out from the idle shaft 22 and gradually moves along the gear surface. Therefore, reliable and sufficient lubrication can be performed. However, in this embodiment, two second grooves 30b are formed on the inner peripheral surface of the bush 30, but the number of the second grooves 30b is not limited, and the number of the second grooves 30b is not limited. Thus, the amount of lubricating oil to be injected can be adjusted appropriately.

[0022]

Since the present invention is constructed as described above,
The following effects are achieved.

That is, as described in claim 1, the lubricating oil is supplied to the support shaft of the idle gear housed in the gear case and rotated by the crankshaft, and the lubricating oil is jetted from the support shaft into the gear case. In this configuration, the lubricating oil is sprayed from the support shaft into the gear case in the radial direction of the gear. The efficiency is improved and sufficient lubrication can be performed.

According to a second aspect of the present invention, the lubricating oil supplied to the support shaft is provided in a bush interposed between the idle gear and the support shaft through a lubricating oil supply passage opening to the outer peripheral surface of the support shaft. Since it is guided to the lubricating oil jetting part of the supporting shaft through the groove formed on the peripheral surface, the lubricating oil does not suddenly jump out from the supporting shaft because the supply passage and the jetting hole are not directly connected. , Because it leaks gradually along the gear surface,
Reliable and sufficient lubrication can be performed.

According to a third aspect of the present invention, a flange portion is formed at the outer end of the support shaft so as to contact the gear surface of the idle gear, and the lubricating oil jetting portion of the support shaft is provided at the gear contact surface of the flange portion. Since the groove is formed, it is possible to reduce the thickness of the idle gear portion, and it is not necessary to form a hole in the idle gear as in the conventional case, and it is possible to reduce the processing cost and the number of processing steps. Further, the cross-sectional area of the lubricating oil jetting portion becomes constant, the amount of lubricating oil supplied becomes stable, and uniform lubrication becomes possible.

According to a fourth aspect of the present invention, the groove on the inner peripheral surface of the bush is a first groove which is connected to the lubricating oil supply passage of the support shaft and is formed in the circumferential direction, and the first groove and the support shaft. Since it is formed by a second groove that is connected to the lubricating oil jetting portion and is formed in a substantially axial direction, this groove allows lubrication between the idle gear and the support shaft and supply of lubricating oil to the lubricating oil supply portion. , Can be performed at the same time, and the drilling of the support shaft can be reduced.

Since one or a plurality of the second grooves are formed as described in the fifth aspect, the amount of lubricating oil to be injected can be appropriately adjusted depending on the number of the second grooves.

[Brief description of drawings]

FIG. 1 is a side sectional view of an engine according to the present invention.

FIG. 2 is a front view showing a gear case portion.

FIG. 3 is a perspective view of an idle shaft.

FIG. 4 is a plan view of the same.

FIG. 5 is a side sectional view of the same.

FIG. 6 is a development view of the bush.

FIG. 7 is a side sectional view of a conventional idle shaft.

[Explanation of symbols]

3 gear case 20 crankshaft 22 Idle axis 23 Idle Gear

Claims (5)

[Claims] 1. Lubricating oil is supplied to a support shaft of an idle gear that is housed in a gear case and is driven to rotate by a crankshaft, and the lubricating oil is jetted from the support shaft into the gear case to lubricate the gear portion. A lubricating oil supply device for an engine, characterized in that the direction of ejection of the lubricating oil from the support shaft into the gear case is the radial direction of the gear. 2. The lubricating oil supplied to the support shaft is formed on the inner peripheral surface of a bush interposed between the idle gear and the support shaft from a lubricating oil supply passage that opens to the outer peripheral surface of the support shaft. The lubricating oil supply device for an engine according to claim 1, wherein the lubricating oil is guided to the lubricating oil jetting portion of the support shaft through the groove. 3. A flange portion that abuts a gear surface of an idle gear is formed at an outer end portion of the support shaft, and a groove that is a lubricating oil ejection portion of the support shaft is formed on a gear abutting surface of the flange portion. The lubricating oil supply device for an engine according to claim 2, wherein 4. A first groove which is formed in the circumferential direction by connecting the groove on the inner peripheral surface of the bush to the lubricating oil supply passage of the support shaft,
The lubricating oil supply device for an engine according to claim 2, wherein the first groove and a lubricating oil jetting portion of the support shaft are connected to each other to form a second groove formed in a substantially axial direction. 5. The lubricating oil supply device for an engine according to claim 4, wherein one or a plurality of the second grooves are formed.