JPH0669303U - Lubricating oil return device to the crank chamber of a vertical overhead valve engine - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the oil consumption while cooling the piston of a vertical overhead valve engine well. [Structure] An end portion 10 of an oil return passage 7 is communicated with an upper portion of a crank chamber 6 of an engine E, and the oil return passage 7 is branched into return ports 11 and 12 into / out of a rotation space 14 of a crankshaft 13. Then, a part of the returning oil is returned into the rotating space 14,
The remaining portion is returned to the outer space 15 of the rotating space 14. A part of the oil is returned to the inside of the rotating space 14 to cool the piston well, and the remaining part is returned to the outside of the rotating space 14 to eliminate the excessive amount of oil mist generated, thereby significantly reducing the oil consumption.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for returning lubricating oil to the crank chamber of a vertical overhead valve engine, which cools the piston satisfactorily and prevents excessive generation of oil mist in the crank chamber, thereby significantly reducing oil consumption. Provide things.

[0002]

[Prior art]

 As shown in FIG. 1 or 7, the basic structure of the lubricating oil returning device to the crank chamber of the vertical overhead valve engine, which is the subject of the present invention, has an upper structure in the crank chamber 6 of the vertical overhead valve engine E. This is a type in which the end portion 10 of the oil return passage 7 is communicated with and the return oil is returned from the oil return passage 7 to the oil pan 1 via the crank chamber 5. As a conventional technique of this type, as shown in FIG. 7, the push rod chamber 52 is formed in the oil return passage 7 so that the lower end portion 50 of the oil return passage 7 faces the rotation space 14 of the crankshaft 13. In some cases, the oil return port 51 is opened.

In the vertical overhead valve engine E, the lubricating oil pressure-fed from the oil pan 1 to the lubrication section 4 such as the rocker arm shaft by the lubrication pump of the forced lubrication device flows from the rocker arm chamber 5 to the oil return path 7 by its own weight. Then, it is guided into the rotation space 14 of the crank chamber 6, is repelled by the rotating crank arm 23 and adheres to the piston 24 to effectively cool it.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional technique, the entire amount of the return oil flowing through the oil return passage 7 is guided into the rotation space 14 of the crankshaft 13, so that excessive oil mist is generated in the crank chamber 6 and the oil return passage 7 is discharged. Therefore, there is a problem that the oil consumption is increased by being blown out into the rocker arm chamber 5 by the blow-by gas. The present invention aims to reduce oil consumption while cooling the piston well.

[0005]

[Means for Solving the Problems]

 Means for achieving the above object will be described below with reference to FIGS. That is, the present invention 1 is a device for returning the lubricating oil to the crank chamber of the vertical overhead valve engine of the basic structure, wherein the end portion 10 of the oil return passage 7 is used as a return port 11 into the rotation space 14 of the crankshaft 13. A part of the oil flowing through the oil return path 7 is returned to the inside of the rotating space 14, and the rest is returned to the outside space 15 of the rotating space 14 by branching to the return port 12 to the outside of the rotating space 14. It is characterized by that. The present invention 2 is the same as the above-mentioned present invention 1 except that the lower end outlet 16 of the oil return passage 7 is covered with a return port member 17 from below, and the return port member 17 is returned to the inside of the rotating space 11 and returned to the outside of the rotating space. The mouth 12 is opened.

The present invention 3 is the same as the above invention 1 or 2, in which the vertical overhead valve engine E is provided with an oil cooling chamber 18 and an oil cooler 19, and the oil pan 1 is provided with a lubricating oil passage 3 of the forced lubricating device 2. The oil cooling chamber 18 to the crank chamber 6 via the oil cooler 19 and the oil return path 7, and the lubricating pump 8 of the forced lubrication device 2 lubricates the oil in the oil pan 1. Is sent to the oil cooling chamber 18, the lubricating oil heated in the oil cooling chamber 18 is radiated by the oil cooler 19, and the oil is returned from the crank chamber 6 to the oil pan 1 via the oil return passage 7. In addition, the throttle valve 20 is provided between the return port 11 of the oil return path 7 into the rotation space and the return port 12 to the outside of the rotation space, and the throttle valve 20 increases the amount of return oil. Then, the valve opening becomes large and the amount of return oil is low. Then it is characterized in that configured so that the opening of the valve is reduced.

The present invention 4 is the same as the above-mentioned present invention 3, but is provided with an opening / closing control valve 21 for the return port 12 to the outside of the rotating space in place of the throttle valve 20, and the opening / closing control valve 21 has a small amount of return oil. The valve is closed when the amount of return oil is large, and the oil is returned from the return port 12 to the space 15 outside the region of the rotating space 14 by the above. The vertical overhead valve engine E of the present inventions 1 and 2 includes a forced lubrication type engine (a normal lubrication type engine in which oil is returned from the rocker arm chamber 5 by its own weight, and an oil cooling engine in which oil is returned by pressure feeding circulation). Not only (including) but also an engine in which oil is taken out by blow-by gas.

[0008]

[Action]

 (1) In the present invention 1, a part of the return oil in the oil return passage 7 is returned to the rotating space 14 of the crankshaft 13, and the rest is returned to the space 15 outside the rotating space 14. Therefore, the oil returned to the rotating space 14 cools the piston 24 satisfactorily. Further, the amount of oil mist generated in the crank chamber 6 can be suppressed as compared with the conventional technique in which the entire amount of return oil is returned into the rotating space 14. (2) In the present invention 2, since the return port member 17 is provided with the return port 11 to the inside of the rotating space 14 and the return port 12 to the outside of the rotating space 14, each engine E of a plurality of types having different rotational speeds used. On the other hand, by providing the return port member 17 in which the opening areas and the opening positions of the both return ports 11 and 12 are changed to the oil return passage 7, both the cooling of the piston 24 and the oil consumption in each engine E are properly performed. Can be converted. Further, even between the engines E in which the rotation direction of the crankshaft 13 is different, the above optimization can be favorably achieved by adjusting the return port member 17.

(3) In the present invention 3, since the oil is pumped into the oil return passage 7 and lubricated, and the throttle valve 20 is provided in the oil return passage 7, when the amount of the return oil increases, the throttle valve 20 The degree of opening is increased and abundant return oil is circulated and circulated to the crank chamber 6 to properly cool the piston and prevent excessive generation of oil mist in the crank chamber 6. On the other hand, when the number of revolutions of the engine E decreases and the amount of return oil decreases, the opening of the throttle valve 20 decreases and the throttle action works, and the return oil is vigorously ejected from the return port 11 in the rotating space 14. It can be flown to a long distance, and the reduction in cooling of the piston can be suppressed.

(4) In the present invention 4, since the opening / closing control valve 21 for the return port 12 to the outside of the rotating space 14 is provided in the oil return passage 7, the opening / closing control valve 21 opens when the amount of return oil is large. Then, the remaining oil other than that returned to the inside of the rotating space 14 is returned from the return port 12 to the space 15 outside the rotating space 14, so that the oil consumption can be reduced significantly. On the other hand, when the number of revolutions of the engine E decreases and the amount of return oil decreases, the open / close control valve 21 closes, the entire amount of oil is returned to the rotating space 14, and the piston can be cooled strongly.

[0011]

[Effect of device]

 (1) According to the first aspect of the invention, the piston is satisfactorily cooled by the oil returned to the rotation space of the crankshaft, and the rest of the return oil is returned to the outside of the rotation space, so there is no excessive generation of oil mist. , Oil consumption can be greatly reduced. (2) In the present invention 2, since the cooling of the piston and the oil consumption of each engine can be optimized by selecting the return port member for each of a plurality of types of engines having different operating speeds, the cylinder block The oil return process and structure can be made common. (3) According to the third aspect of the present invention, even if the amount of return oil is small, the throttle action of the throttle valve causes the oil to be ejected far into the rotation space, so that the cooling of the piston can be suppressed smoothly. (4) In the present invention 4, the opening and closing action of the on-off control valve can greatly reduce the oil consumption when the amount of return oil is large, and the cooling of the piston when the amount of return oil is small. The decrease can be strongly suppressed.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional front view of a main portion of a lubricating oil returning device for a crank chamber of a partially oil-cooled vertical overhead valve diesel engine showing Embodiment 1, and FIG. 2 is a right side vertical sectional view of the main portion of the engine. 3 is a perspective view of the return port member.

As shown in FIG. 1, an oil cooling chamber 18 is formed around the auxiliary combustion chamber 25 of the partially oil-cooled vertical overhead valve diesel engine E, and is formed above the wind guide case 31 of the engine E. The oil cooler 19 is arranged so as to face the cylinder head 27, and the oil cooler 19 can be cooled by the cooling air from the air guide case 31.

The cylinder block 26 and the cylinder head 27 of the diesel engine E are provided with an oil feed passage 28, and an oil return passage 7 is defined along the push rod fitting opening 32 to lubricate the forced lubrication device 2. The relief oil passage 30 is branched from the relief valve 29 of the oil passage 3 to the downstream side, and the relief oil passage 30 is routed through the oil feed passage 28, the oil cooling chamber 18, the oil cooler 19 and the oil return passage 7 to the crank chamber. Connect to 6. In this case, the lubricating oil in the oil pan 1 is pressure-fed by the lubrication pump 8 to the various lubrication parts 4 such as the rocker arm shaft and the crankshaft 13, and the relieved lubricating oil is pressure-fed from the oil feed passage 28 to the oil cooling chamber 18. Thus, the auxiliary combustion chamber 25, which is particularly easily overheated in the engine E, is oil-cooled. The lubricating oil that has absorbed heat in the oil cooling chamber 18 is radiated by the oil cooler 19 and is circulated by pressure from the crank chamber 6 to the oil pan 1 through the oil return path 7.

As shown in FIGS. 1 and 2, the lower end outlet 16 of the terminal portion 10 of the oil return path 7 is covered with a return port member 17 from below, and the return port member 17 is inserted into the rotation space 14 of the crankshaft 13. The return port 11 and the return port 12 to the outside of the rotation space 14 are opened, the crank chamber side portion 10 of the oil return passage 7 is branched into the inside / outside region of the rotation space 14, and flows through the oil return passage 7. A part of the oil is returned to the inside of the rotating space 14, and the remaining part is returned to the outside space 15 of the rotating space 14. As shown in FIG. 3, in the oil return path 7, the flange portion 34 is extended to the gutter-shaped object 33 having a U-shaped cross section, the other end 33a of the gutter is closed in a curved shape, and the one end opening part of the gutter-shaped object 33 is opened. 33b is used as the return port 11 to the inside of the rotation space 14, and the return port 12 to the outside of the rotation space 14 is opened in the curved closing portion 35.

Therefore, the function of the lubricating oil returning device for the crank chamber of the first embodiment will be described. The return oil, which is radiated by the oil cooler 19 and is circulated under pressure in the oil return passage 7 to the oil pan 1, is guided from the lower end outlet 16 of the return passage 7 to the trough-like return port member 17, and part of the oil is returned. While being returned from the port 11 into the rotation space 14 of the crankshaft 13, the remaining portion is returned from the return port 12 to the space 15 outside the region of the rotation space 14. For this reason, the piston 24 is satisfactorily cooled by the oil returned to the rotating space 14, and at the same time, the crank chamber 6 is cooled in comparison with the prior art (see FIG. 7) in which the entire amount of the returning oil is returned to the rotating space 14. It is possible to suppress excessive generation of oil mist, and to greatly reduce oil consumption.

Further, since the return port member 17 is provided with two return ports 11 and 12 for the inside and the outside of the rotating space 14, the return port member 17 corresponding to each engine E of a plurality of types having different rotational speeds is provided. By changing the opening area and opening position of the return ports 11 and 12 and attaching them, both cooling of the piston 24 and oil consumption in each engine E can be optimized, and the processing and structure for oil return of the cylinder block 26 can be improved. Can be shared.

4 and 5 show a second embodiment of the present invention, in which a return port 11 into the rotary space 14 and a return to the outside of the rotary space 14 are provided at the terminal end 10 of the oil return path 7 running in the cylinder block 26. The port 12 is opened linearly, and the throttle valve 20 is interposed between the both return ports 11 and 12. The throttle valve 20 is composed of a ball valve body 36 facing the return ports 11 and 12, and a valve spring 37 for urging the ball valve body 36 upward. When the amount of return oil increases, the valve opens. The valve opening is reduced when the oil amount decreases and the oil amount decreases.

Therefore, the function of the lubricating oil returning device for the crank chamber of the second embodiment will be described. (1) As shown in FIG. 5B, when the rotation speed of the diesel engine E is increased and the amount of return oil flowing down the oil return path 7 is increased, the ball valve body 36 is closed with the increase in oil pressure. Since it is pushed down against the elastic force of the spring 37, the opening degree of the throttle valve 20 increases and abundant return oil is returned to the crank chamber 6 from the return ports 11 and 12. Therefore, a part of the oil appropriately cools the piston 24, and the remaining part of the oil is released to the space 15 outside the rotating space 14 to prevent excessive generation of oil mist.

(2) As shown in FIG. 5A, when the rotation speed of the diesel engine E is reduced and the amount of the return oil flowing down the oil return path 7 is reduced, the ball valve body is reduced due to the decrease in oil pressure. Since 36 is pushed up by the elastic force of the valve spring 37, the opening degree of the throttle valve 20 becomes small and the throttle action works, and the return oil can be vigorously flown from the return port 11 to a far distance in the rotating space 14, and the piston It is possible to favorably suppress the decrease in cooling of No. 24.

FIG. 6 shows a third embodiment of the present invention in which an opening / closing control valve 21 for the return port 12 to the outside of the rotating space 14 is provided in place of the throttle valve 20 of the second embodiment. As shown in FIG. 6, the opening / closing control valve 21 is composed of a ball valve element 38 and a valve spring 39 as in the second embodiment, and the return port 11 of the oil return passage 7 into the rotary space 14 is provided. The opening position is set in a step above the return port 12 to the outside of the rotating space 14, and when the amount of return oil is small, the opening / closing control valve 21 closes and the amount of oil in the return oil is large. Is configured to open.

Therefore, the function of the lubricating oil return device according to the third embodiment will be described. (1) As shown in FIG. 6B, when the number of revolutions of the diesel engine E increases and the amount of return oil flowing down the oil return path 7 increases, the ball valve body 38 opens the valve as the oil pressure increases. The remaining oil, which is pushed back against the elastic force of the spring 39 to open the return port 12 to the outside of the rotation space 14 and is returned to the rotation space 14, is the region of the rotation space 14 from the return port 12 concerned. Since it is returned to the outer space 15, oil consumption can be significantly reduced.

(2) As shown in FIG. 6A, when the number of revolutions of the diesel engine E is reduced and the amount of return oil flowing down the oil return path 7 is reduced, the ball valve body is reduced due to the decrease in oil pressure. 36 is pushed up by the elastic force of the valve spring 37, and the return port 12 to the outside of the rotating space 14 is closed, so that the oil does not escape to the space 15 outside the area, and the entire amount of oil is returned to the rotating space 14. The piston can be cooled strongly.

As described above, the present invention is characterized in that the oil is returned from the oil return path 7 to the crank chamber 6 in a branched manner inside and outside the rotation space 14 of the crankshaft 13. The lubricating oil returning device according to the first embodiment is not limited to the oil-cooled engine in which the oil is returned by the pressure feeding circulation, but can be applied to the following engines. (1) Lubricating oil in the oil pan 1 is pressure-fed to the lubrication part 4 (for example, rocker arm shaft) facing the rocker arm chamber 5, and can be circulated by its own weight from the crank chamber 6 to the oil pan 1 via the oil return path 7. Configured normal forced lubrication engine. (2) An engine in which oil mist takes out the oil return passage 7 by blow-by gas.

Further, in the first embodiment, instead of the method of attaching the return port member 17 to the lower end outlet 16 of the oil return passage 7, the terminal end portion 10 of the oil return passage 7 is provided in the rotation space 14 of the crankshaft 13. There is no problem even if a branch is opened to the inside / outside return ports 11 and 12.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional front view of essential parts of a lubricating oil returning device for a crank chamber of a partially oil-cooled vertical overhead valve diesel engine according to a first embodiment.

FIG. 2 is a right side view of a longitudinal section of a main part of the engine.

FIG. 3 is a perspective view of a return port member.

FIG. 4 is a view corresponding to FIG. 1 showing a second embodiment.

5 is an enlarged vertical sectional front view of a main part of a P part in FIG. 4. FIG.

FIG. 6 is an enlarged vertical sectional front view of a main part around an opening / closing control valve according to a third embodiment.

FIG. 7 is a vertical cross-sectional front view of a lubricating oil returning device for a crank chamber of a vertical overhead valve engine showing a conventional technique.

[Explanation of symbols]

1 ... Oil pan, 2 ... Forced lubrication device, 6 ... Crank chamber,
7 ... Oil return path, 8 ... Lubrication pump, 10 ... End portion of 13, 13 ... Crankshaft, 14 ... 13 rotation space, 15 ...
14 space outside the area, 11 ... Return port to 14 inside, 12 ... 1
Return port to 5, 16 ... Lower end outlet of 7, 7 ... Return port member, 18 ... Oil cooling chamber, 19 ... Oil cooler, 20 ... Throttle valve, 21 ... Open / close control valve, E ... Vertical overhead valve engine.

Claims (4)

[Scope of utility model registration request] 1. A crank chamber of a vertical overhead valve engine (E)
The end portion (10) of the oil return passage (7) is communicated with the upper part in (6), and the return oil is passed from the oil return passage (7) to the crank chamber (5).
In a lubricating oil returning device for a crank chamber of a vertical overhead valve engine configured to return to an oil pan (1) via a rotary shaft, the end portion (10) of the oil returning passage (7) is connected to the rotation space of the crankshaft (13). A part of the oil flowing through the oil return path (7) is branched into the rotating space (14) by branching into the returning port (11) into the inside (14) and the returning port (12) outside the rotating space (14). A lubricating oil returning device for the crank chamber of a vertical overhead valve engine, characterized in that the remaining portion is returned to the outer space (15) of the rotating space (14). 2. The return port member (17) is put on the lower end outlet (16) of the oil return passage (7) from below, and the return port member (17) and the return port (11) into the rotating space and the rotating space. Return to the outside
(12) is opened, and the lubricating oil returning device to the crank chamber of the vertical overhead valve engine according to claim 1. 3. The apparatus for returning lubricating oil to the crank chamber of a vertical overhead valve engine according to claim 1, wherein the vertical overhead valve engine (E) includes an oil cooling chamber (18) and an oil cooler.
(19) is provided, the oil pan (1) is connected to the oil cooling chamber (18) through the lubricating oil passage (3) of the forced lubrication device (2), and the oil cooling chamber (1
8) is connected to the crank chamber (6) through the oil cooler (19) and the oil return passage (7), and the lubrication pump (8) of the forced lubrication device (2) is used to connect the oil pan.
The lubricating oil in (1) is sent under pressure to the oil cooling chamber (18), and the oil cooling chamber (18)
The oil cooler (19) radiates the heat of the lubricating oil heated by the oil cooler (19), and the oil return path (7) is used to move the oil from the crank chamber (6)
It is configured so that it can be pumped and circulated to (1), and a throttle valve (20) is provided between the return port (11) of the oil return path (7) into the rotating space and the return port (12) outside of the rotating space. By interposing the throttle valve (20), the opening degree of the valve increases when the amount of return oil increases, and the opening degree of the valve decreases when the amount of return oil decreases. What is characteristic. 4. The lubricating oil returning device for a crank chamber of a vertical overhead valve engine according to claim 3, wherein the throttle valve (20) is replaced with a return port (1) to the outside of the rotating space (14).
An on-off control valve (21) for 2) is provided. The on-off control valve (21) closes when the amount of return oil is small, and opens when the amount of return oil is large, so that the oil returns It is characterized in that it is configured to be returned from the mouth (12) to the outside space (15) of the rotating space (14).