JPH0213689Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air breather device used in an engine or the like.

[Conventional technology]

Conventionally, the pressure inside the engine crankcase tends to increase due to blow-by gas leaking from the combustion chamber, and pulsating pressure is generated by the reciprocating movement of the piston, so the engine crankcase is fixed to the crankcase. There is a problem where lubricating oil leaks from the sealing surface between the gear case and the gear case, and to prevent this, an air breather device is used to communicate the crankcase and gear case, release the pressure inside the gear case to the atmosphere, or communicate it to the intake passage. has been done.

[The problem that the idea attempts to solve]

However, lubricating oil scraped up by the crankshaft, crank gear, cam gear, etc. exists in the air vent passage (passage that guides the internal fluid to the outside) provided in the gear case in the form of a spray.
Particularly at low temperatures or when using high viscosity oil, large oil droplets pass through the air vent passage, are ejected to the outside, or are sucked into the intake passage, increasing lubricant consumption and polluting the atmosphere. There was a problem that a large amount of lubricating oil was supplied to the intake passage, making combustion unstable and increasing white smoke.

[Means to solve the problem]

The present invention was proposed in view of the above, and includes a crankcase 2 in which a crankshaft 4 and a camshaft 6 are housed and supported, a crank gear 12 fixed to an end of the crankshaft 4, and a crankcase 2 that accommodates and supports a crankshaft 4 and a camshaft 6. A flyweight 18 provided adjacent to the crank gear 12; a cam gear 14 meshing with the crank gear 12 and fixed to the end of the camshaft 6; A gear case 10 is fixed to the crankcase 2 and stores lubricating oil 22 so as to immerse a part of the cam gear 14, and the crankcase 2 and the gear case 10 Opening 5 that communicates with
8. A one-way valve 28 that is disposed above the gear case 10 and allows the gas inside the gear case 10 to flow only in an outward direction, and a passage 56 that guides the gas flowing into the gear case 10 through the opening 58 to the one-way valve 28. A bump-full plate 60 is disposed close to the periphery and a part of the side surface of the cam gear 14 and is formed so that the lubricating oil 22 splashed by the cam gear 14 collides with the bump-full plate 60. , a lubricating oil 2 disposed close to the flyweight 18 and colliding with it.
2 to the flyweight 18, and the lubricating oil 22 extending toward the pump cam 24 and colliding with the pump cam 24.
It is an object of the present invention to provide an air breather device characterized in that a second buffle 64 is formed to guide the air.

[Effect]

According to the present invention, the lubricating oil scattered from the cam gear collides with the buttful plate and is prevented from scattering toward the one-way valve, reducing the amount of lubricating oil sprayed to the outside and actively guiding it to the pump cam and flyweight.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

Reference numeral 2 denotes an engine crankcase, in which a crankshaft 4 and a camshaft 6 are housed, and are supported by a side wall 8.

10 is a gear case and the side wall 8 of the crankcase 2
and a plurality of gears such as a crank gear 12 fixed to the end of the crankshaft 4, a cam gear 14 fixed to the end of the camshaft 6, a fuel injection pump 16, and a plurality of gears provided to the crank gear. A space 20 is formed in which a governor device and the like of the fuel injection pump 16, which mainly includes the flyweights 18, 18, are housed.

Reference numeral 22 denotes lubricating oil stored below the crankcase 2 and gear case 10, in which the lower part of the cam gear 14 is immersed, and the rotation of the cam gear 14 scatters the lubricating oil into the space inside the gear case 10, thereby applying the lubricating oil to each lubricating part. supply 24 is cam gear 14
The pump cam is fixed to the

Reference numeral 26 denotes an air breather device, and a one-way valve 28 is formed in the gear case 10, located above the cam gear 14. Same one-way valve 2
8 is a partition wall 3 formed integrally with the gear case 10.
a valve chamber 32 and a pressure chamber 34 separated by 0;
A disc-shaped valve body 36 formed of a mixture of cloth and rubber is placed on the side of the valve chamber 32, a cylindrical spacer 40 is placed in a positioning hole 38 formed in the center of the valve body 36, Bolts 42 and washers 44 that secure the spacer 40 to the partition wall 30
The valve chamber 32 has a plurality of openings 45, 45, . Or communicated with the intake pipe.

The pressure chamber 34 is guided downward from an opening 50 on the space 20 side of the gear case 10 to an opening 58 into the crankcase by a rib-shaped first partition wall 52 that protrudes from the gear case 10 in the direction of the crankcase 2. The wall 52 and a rib-shaped second partition wall 54 protrude substantially parallel to each other and communicate with each other via a passage 56 sandwiched between the wall 52 and a rib-shaped second partition wall 54 that protrudes substantially parallel to the wall 52 . The opening 58 communicates with the internal space of the crankcase 2.

Reference numeral 60 denotes a buffle plate, which is made of sheet metal and has a first buffle 62 and a second buffle 64 formed by bending the portion shown in two-dot chain line in FIG. The first baffle 62 is connected to the cam gear 14 as shown in FIG.
It has a generally L-shape with a first edge 68 proximate to the upper edge 66 and a second edge 72 proximate to the side surface 70 of the cam gear 14 . The second Batsuful 64 is
First surface 74 adjacent to upper edge 66 of cam gear 14
and a second surface 76 that is bent in the direction of the side surface 70 into an L-shaped cross section.

The first baffle 62 is close to the crank gear 12, and when the cam gear 14 rotates in the direction of arrow A in the figure to agitate and scatter the lubricating oil below, the scattered lubricating oil collides with the crank gear 12 and causes the crank gear 12 to fly. It is arranged at a position where it reflects in the direction of the weight 18.

The second baffle 64 collides with and reflects the scattered lubricating oil that remains attached to the cam gear 14 without being reflected by the first buffle 62, causes it to fall downward, and guides it toward the pump cam 24.
Prevent lubricating oil from scattering in the direction.

Furthermore, when the pressure inside the crankcase 2 increases due to blow-by gas, piston reciprocation, etc., the pressure is transmitted to the one-way valve 28 via the opening 58 and the space 20 in the gear case 10, particularly the passage 56, and causes the valve body 36 to Opening operation, openings 45, 4
5... is released to the atmosphere or the intake passage through the exhaust pipe 48, and when the pressure becomes equal to the external pressure, the opening 45 closes and the reciprocating movement of the piston causes the crankcase 2
The one-way valve 28 remains closed even if the internal pressure becomes negative with respect to atmospheric pressure. For this reason,
The insides of the crankcase 2 and gear case 10 are maintained at a low pressure state.

Therefore, according to this embodiment, the one-way valve 28 allows the crank case 2 and the gear case 10 to
The internal pressure is low to effectively prevent oil leakage, and the lubricating oil scattered by the cam gear 14 is reflected by collision with the bump-full plate 60, thereby preventing the lubricating oil from scattering from the passage 56 etc. in the direction of the one-way valve 28. It reduces oil consumption, prevents air pollution, stabilizes combustion, and reduces white smoke.

In addition, the first buttful 62 of the buttful plate 60
The second buttful 64 transfers the scattered lubricating oil to the flyweight 18 of the crank gear 12 and the pump cam 2.
4, the lubrication of these components is also improved.

[Effect of idea]

The lubricating oil splashed by the cam gear is reflected by the bump-full plate, which prevents the lubricating oil from scattering in the direction of the one-way valve, reducing lubricating oil consumption, preventing air pollution, and reducing combustion. In addition to achieving stability and reducing white smoke, the first and second buttful portions of the buttful plate efficiently guide scattered lubricating oil to the fly weights and pump cam, so they also have good lubrication. It has the effect of becoming.

[Brief explanation of drawings]

FIG. 1 is an explanatory cross-sectional view of FIG. 2 showing an embodiment of the present invention, and FIG.
FIG. 3 is an explanatory view of FIG. 1 in the - arrow direction. FIG. 4 is an enlarged explanatory view of the one-way valve in one embodiment. FIG. 5 is an enlarged explanatory diagram of the buff-full plate in one embodiment. The figure is an explanatory diagram in the direction of the arrows in FIG. 5. 2...Crank case, 4...Crankshaft, 6
...Camshaft, 10...Gear case, 12...Crank gear, 14...Cam gear, 26...Air breather device, 32...Valve chamber, 36...Valve body, 52...First partition wall, 54... second partition wall,
58...Opening, 60...Bullet full plate.

Claims (1)

[Scope of utility model registration request] A crank case 2 in which a crankshaft 4 and a camshaft 6 are housed and supported, a crank gear 12 fixed to an end of the crankshaft 4, and a crank gear 12 provided adjacent to the crank gear 12 at the end of the crankshaft 4. Fly weight 18 and crank gear 1 above
2 and fixed to the end of the camshaft 6, and a pump cam 24 provided adjacent to the cam gear 14 at the end of the camshaft 6. a gear case 10 that is fixed to the cam gear 2 and stores lubricating oil 22 so as to partially immerse the cam gear 14;
an opening 58 that communicates between the crankcase 2 and the gear case 10; a one-way valve 28 that is disposed above the gear case 10 and allows the gas inside the gear case 10 to flow only in an outward direction; and the opening 58.
The lubricating oil 22 disposed close to the periphery and part of the side surface of the cam gear 14 collides with the lubricating oil 22 that is scattered by the cam gear 14. The baffle plate 60 includes a first lubricating oil 22 that is disposed close to the flyweight 18 and guides the colliding lubricating oil 22 to the flyweight 18.
An air breather device characterized in that a buffle 62 and a second buffle 64 are formed that extend toward the pump cam 24 and guide the lubricating oil 22 that collides with the pump cam 24 to the pump cam 24.