JPS61129413A - Breather device in v-engine of ohv type - Google Patents

Abstract

PURPOSE:To easily ensure the volume of an oil gas separator chamber and easily clean the chamber, by providing the oil gas separator chamber, integrally formed with a crankcase, in a space formed in a V-bank in the side of a driven gear of a cam shaft. CONSTITUTION:A space is formed in a V-bank in the side of a driven gear 16 of a cam shaft 15, that is, V-bank almost corresponding to the side surface of the driven gear 16 as seen through parallelly to a crankshaft 2, and the space provides an oil gas separator chamber 22 to be integrally formed with a crankcase 1. And blow-bye gas in a crank chamber 14, being introduced to a rocker arm chamber 10 through a right side push rod insertion hole 20 from an opening hole 27, is introduced, after lubricating the inside of said chamber 10, into the oil gas separator chamber 22 from a gas inlet 24 through a left side push rod insertion hole 20. In this way, the volume of the oil gas separator chamber 22 can be easily ensured while the chamber can be easily cleaned by simplifying an external shape in the bottom part of the V bank.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a breather device for an OHV V-type engine.

[Conventional technology]

0H with intake and exhaust valves on the top surface of the combustion chamber as a cylinder configuration
V (Overhead valve 9 type cylinder/da is used, and this is OHV type ■ type ENONO/ arranged in 6 V shape).

In this type of engine, a camshaft is usually arranged above the crankshaft (on each cylinder side), and tappets and gutsy rods for driving intake and exhaust valves are arranged along the upper side of each cylinder.

On the other hand, four-cycle engines including the above-mentioned types are provided with a means for returning the power leaking from the piston fitting surface to the crank chamber, that is, a venting device for the crank chamber.

If the flow-high gas is left as is, the crank chamber pressure will rise excessively and engine oil will leak, so a breather device is usually required to guide this blow-by gas to the outside through the check pulp. In this case, the blow-by gas usually contains end-combustion gas, which tends to cause pollution if released into the atmosphere, so it is usually returned to the air cleaner.

In addition, since oil mist (due to oil agitation in the crank chamber) is mixed in with the blow-by gas, it is necessary to separate the oil and gas before returning it to the air cleaner in order to prevent air pollution, white smoke, and carbon deposits. is being carried out. Furthermore, the breather device needs to be installed at the top of the crankcase for the purpose of discharging blow-by gas.

By the way, as a document disclosing the structure of a conventional OHV type V-type breather device, for example, Utility Model Publication No. 56-2
There is No. 3456.

[Problem that the invention seeks to solve]

However, in the past, this type of breather device was generally constructed by attaching a separate structure to the top of the gear chamber of the crankcase or to the side of the gear chamber protruding from the top surface of the crankcase, so oil and gas were separated. The problem is that the volume of the chamber cannot be made sufficiently large, resulting in insufficient oil/gas separation, and the problem that the gear chamber becomes large to form the oil/air separation chamber. Since various parts are attached to the intersections on the sides, dust, straw, etc. tend to accumulate, and it is difficult to clean them.

In addition, the blow-by gas is guided to the rocker arm chamber, and the inside of the rocker arm chamber and the inside of the rocker arm chamber and! It has been proposed to lubricate the valve train mechanism such as a cylinder head, but in conventional breather devices, the gas passage from the rocker arm chamber to the oil/gas separation chamber must be constructed as a completely independent passage or piping, and the structure There was a layer of complexity.

The present invention was completed in view of the problems of the prior art, and it is possible to easily increase the volume of the oil/gas separation chamber to improve the oil/gas separation function, and to make the shape of the bottom of the V bank smooth. To provide a breather device for an 0f-IV type engine that reduces the accumulation of dust and straw waste and is easy to clean.

A second object of the present invention is to provide a breather device for an OHV type engine that is simple in structure and has an excellent oil/gas separation function when it also lubricates the rocker arm chamber.

[Means for solving problems]

The present invention achieves the above object by providing an oil/gas separation chamber integrally formed with the crankcase in a space formed in the bank on the side of the driven gear of the camshaft.

Moreover, the second invention is configured to introduce the blowby gas in the crank chamber into the rocker arm chamber and then guide it to the oil/gas separation chamber, and also provides a blowby gas passage from the crank chamber to the rocker arm chamber and the rocker arm chamber. The above object is achieved by forming at least one of the blow gas passages from the chamber to the oil/gas separation chamber with a square through hole.

〔Example〕

FIG. 1 shows a vertical cross section of a breather device according to an embodiment of the present invention in a direction perpendicular to the crankshaft, and FIG.
1 and 2, a cross section taken along line fs1-II is shown, and the present invention will be described in detail below with reference to these drawings. In FIGS. 1 and 2, a crankshaft 2 is supported on a crankcase 1, and A pair of cylinders 3.degree. 3 are provided at the top of both sides of the case 1 at a predetermined angle (for example, 90 degrees) in a square arrangement.

The piston 4 fitted in each cylinder 3, 3 and the crank pin 5 of the crankshaft 2 are connected to a joint 6.
, 6. A cylinder spatula P7, 7 is fixed to the upper end of each cylinder/3, 3, and a combustion chamber 8.8 is formed between it and the piston 74, 4. A head cover 9,9 is fixed to the upper side of each cylinder head 7.7, and a rocker arm chamber 10.10 is formed inside thereof.
In each rocker arm chamber 10.10, a rocker arm 11.11 for driving the intake and exhaust valves (one lI for each intake valve and exhaust valve) is pivotally supported.

Each cylinder head 7.7 is provided with an intake valve 12 and an exhaust valve (not shown). Note that reference number 13.13 indicates a spark plug.

A camshaft 15 is supported above the crankshaft 2 inside the crankcase 1 (crank chamber) 14,
The camshaft 15 is driven to rotate at one-half the speed of the crankshaft 2 via a driving gear 16. The camshaft 15 has a cam (
A total of 4 locations) 17 are formed.

A tappet 18 and a gripper rod 19 are provided between each cam 17 and each rocker arm 11. Each tappet 18 is supported in a reciprocating manner within the crankcase 1, and each tappet 19 passes through an insertion hole (or tunnel) 20t formed along the upper side of the cylinder 3 and cylinder head 7, and extends through the insertion hole (or tunnel) 20t formed along the upper side of the cylinder 3 and cylinder head 7. It touches one end.

Reference numeral 21 in Figures 1 and 41 indicates an intake system consisting of an air cleaner and a middle exhaust system provided at the back of the parlor section.

However, inside the V-bank of the camshaft 15 on the side of the dog gear 16, that is, on the side of the dog gear 160 when viewed parallel to the crankshaft 2! An oil/gas separation chamber 22 formed integrally with the crankcase 1 is provided in a space formed within the corresponding V bank.

As shown in FIGS. 1 and 2, this oil/gas separation chamber 22 is formed adjacent to one of the through-holes 20, and is connected through a gas port 24 with a check pallet F23 formed on the partition wall between them. The through hole 2QK is configured to be in communication.

A bridging block 25 communicating with the air cleaner 6 is connected to the outer wall surface of the oil/gas separation chamber 22. Further, an oil return passage 26 is formed between the oil/gas separation chamber 22 and the crank chamber 14.

Further, the lower part of the booklet insertion hole 20 which is remote from the oil/gas separation chamber 22, that is, the right side in FIG. , the upper ends of the rod insertion holes 20 and 20 of both shoes 7 are open to the a-locker arm chamber 10. In this way, the blow-by gas in the crank chamber 14 is transferred from the opening 27 to the right side gashier aud insertion hole 20 as shown by the arrow in FIG.
After introducing it into the rocker arm chamber 10 through the blow-by gas and sliding it inside the rocker arm chamber 10 with the oil in the blow-by gas,
The blow-by gas is introduced into the oil/gas separation chamber 22 from the gas port 24 through the entire left side plunger insertion hole 20. The check pulp 23 provided in the gas port 24 operates to allow the flow into the oil/gas separation chamber 22 but block the flow in the opposite direction, and when the pressure in the crank chamber 14 is above a predetermined value, the check pulp 23 operates as shown in FIG. The valve is opened and blow-by gas is introduced into the oil/gas separation chamber 22.

As explained above with reference to Figs. 1 and 2, the 9 OHV type ■ type engine has a structure in which the crankshaft 2 can be used in a horizontal position as shown in the figure, and a vertical shaft type arrangement in which the crankshaft 2 is in the vertical direction. Alternatively, it is also possible to use an arrangement in which the crankshaft 2 is inclined. In the case of a vertical axis type arrangement or a similar arrangement, the oil/air separation chamber 22 is configured to be on the upper side and the dog gear 16 of the camshaft 15 is on the lower side.
As a result, the oil/gas separation chamber 22 is positioned at the top of the tying chamber 14, and the lubricating oil (oil) is separated.
You can be sure.

According to the embodiments described above, similar effects and effects can be obtained.

(1) P rigidine gear 16C of camshaft 15
It is possible to easily form a sufficiently large oil/air separation chamber 22 without providing a protruding part on the shift flank case with an enlarged gear chamber and the oil/air separating chamber 22t integrally formed with the oil/air separating chamber 22t. Separation can be performed reliably. At the same time, ■The shape and structure of the bank bottom, that is, the intersection of the upper surface of the ring 3.3, can be made smooth and smooth, resulting in a structure that reduces the accumulation of dust and straw debris and is easy to clean. can do.

(II) The blow-by gas in the crank chamber 14 is introduced into the a-arm chamber 10 and then into the oil-gas separation chamber 22, and the existing knock rod insertion holes 20, 20 are used as gas passages for this purpose. Blow-by gas containing a large amount of oil can be supplied to the rocker arm chamber 10, and the rocker arm chamber 10 can be sufficiently lubricated without providing an independent lubricating oil passage.

At the same time, a certain degree of oil and gas separation is also performed in the rocker arm chamber 10, so that separation in the oil and gas separation chamber 22 is ensured and the amount of lubricating oil consumed can be reduced.

Furthermore, Gussi: Lα insertion hole 20, 2. Since it is used as an Ot-gas passage, there is no need to provide a dedicated gas passage, and the tab head 18 and gripper rod 19 can be lubricated.

Iji) When the crankshaft 2t is used as a vertical shaft type engine with the crankshaft 2t up and down, the oil and gas separation chamber 22 can be placed at the top of the crank chamber 14, so oil and gas separation in the vertical shaft type two cylinders must also be performed reliably. I can do it.

In addition, the V-type two/thin shown in the figure has two parts on one crank pin 5.
1! Although this is a one-pin type that connects connecting rods 6 and 6 of I, it can also be a two-pin type that has two crank pins and connects a small rod to each. Further, the air guide insertion hole can be formed as a separate guide instead of being integrated into the cylinder f head as shown.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is easy to secure the volume of the oil/gas separation chamber, and the bottom of the bank is made smooth and smooth to reduce the accumulation of dust and straw debris. An OHV-type double-wall breather device that is easy to clean can be obtained.Furthermore, according to the second invention, an OHV-type double-wall breather device with a simple structure that also lubricates the rocker arm chamber at the same time can be obtained.
A breather device is obtained.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway vertical cross-sectional view showing a bleeder device for an OHV type engine according to an embodiment of the present invention, taken in a direction perpendicular to the metal crankshaft, and FIG. 2 is a longitudinal sectional view showing the line n-- FIG. 3 is a cross-sectional view taken along fl. 1... Crank case. 2...Crank/ya7to. 3...Cylinder. 10...Locker arm room. 14...Crank chamber. 1510-・Camshaft. 16...Dripumpuya. 19...Gusherrod. 20...Gushini rod insertion hole. 22...Oil/gas separation chamber. 23...Check pulp. 24...Gas population. 25...Prede Δide. Agent Patent Attorney Yasushi Oone

Claims (3)

[Claims] (1) In an OHV V-type engine that has a camshaft inside the V bank, an oil/air separation chamber that is integrally formed with the crankcase is provided in the space formed within the V bank on the side of the driven gear of the camshaft. breather device. (2) In an OHV type V-type engine having a camshaft in a V-bank, the blow-by gas in the crank chamber is introduced into the rocker arm chamber and then guided to the oil/gas separation chamber, and from the crank chamber to the rocker arm chamber. A breather device in which at least one of the blow-by gas passage and the blow-by gas passage from the rocker arm chamber to the oil/gas separation chamber is formed by a push rod insertion hole. (3) In an OHV V-type engine having a camshaft in a V bank, an oil/air separation chamber integrated with the crankcase is provided in a space formed in the V bank on the side of the driven gear of the camshaft, and the oil/air separation chamber is integrated with the crankcase. A breather device in which the crankshaft is arranged vertically so that the gas separation chamber is on the upper side and the driven gear is on the lower side.