JP5724357B2 - Engine breather equipment - Google Patents

Description

  The present invention relates to a breather device that can be effectively applied to an engine of an automobile or a motorcycle.

  Conventionally, as a breather structure for recirculating blow-by gas blown from the combustion chamber of the engine into the crank chamber or the valve operating chamber of the cylinder head to the intake system, a disc-like member is formed at the end of the camshaft as in Patent Document 1. Two gas-liquid separation chambers are provided. A blow-by gas oil separator is known in which when the camshaft rotates, gas-liquid separation is performed in the gas-liquid separation chamber, and only gas is recirculated to the intake system.

JP 7-150924 A

  However, in the above breather structure, it is necessary to combine a plurality of disks to form a separation chamber in order to perform gas-liquid separation, and the increase in the driving force required for the rotation is a problem due to the increase in mass around the rotating shaft. It was.

  The present invention has been made in view of the above problems, and is an engine breather device that has a simple structure, is light in weight, can efficiently recover blowby gas, and can improve gas-liquid separation performance. The purpose is to provide.

In order to solve the above problems, an engine breather apparatus according to the present invention includes a rotary gas-liquid separator that gas-liquid separates blow-by gas in an engine case, and a gas collection chamber in which blow-by gas after gas-liquid separation is collected The air collecting chamber is composed of a recessed portion formed on the side wall of the crankcase and a breather shaft fixed to the recessed portion, and the gas-liquid separator is rotatable on the breather shaft. and Burizagia mounted on, is composed of a breather cover fitted on one side of the Burizagia, wherein the breather cover of the gas-liquid separator comprises forming a plate member into a cup shape, the opening of the cup-shaped place the side so as to face the open end of the current air chamber, the open end of the current air chamber, than said opening of cup-shaped are disposed inwardly, the Burizagia of the gas-liquid separator ene The emission power is driven to rotate, the outer peripheral edge portion of the cup shape of the breather cover, characterized in that fitted into the recess of the Burizagia.

  In the engine breather device according to the present invention, the gas-liquid separator is disposed in a clutch chamber of the engine, and has another rotating member below the gas-liquid separator in a side view of the engine. .

The breather device for an engine according to the present invention is characterized in that a concave and convex groove portion is formed on the cup-shaped inner surface of the gas-liquid separator toward the opening diameter direction of the air collecting chamber.

  If comprised as mentioned above, since it is a simple structure compared with the conventional structure and blow-by gas can be suck | inhaled from the cup-shaped opening side, the recovery efficiency of blow-by gas can be improved.

1 is a left side view of a motorcycle having a breather device for an engine according to an embodiment of the present invention. It is a side view showing the whole engine composition in an embodiment of the present invention. It is a disassembled perspective view which shows the structural example around the crankcase of the engine in embodiment of this invention. It is a side view showing the whole engine composition in an embodiment of the present invention. 1 is a right side view of an engine to which a breather device according to the present invention is applied. It is a rear view of the engine in the embodiment of the present invention. It is sectional drawing which follows the II line | wire of FIG. It is the front view and sectional drawing of the breather gear in the breather apparatus of this invention. It is the front view and sectional drawing of the breather cover in the breather apparatus of this invention.

Hereinafter, preferred embodiments of an engine breather apparatus according to the present invention will be described with reference to the drawings.
FIG. 1 is a left side view of a motorcycle having a breather device for an engine according to the present embodiment. First, the overall configuration of the motorcycle 100 will be described with reference to FIG. In each of the drawings including FIG. 1 in the following description, the front of the vehicle is indicated by an arrow Fr, the rear of the vehicle is indicated by an arrow Rr, and the lateral right side of the vehicle is indicated by an arrow R as necessary. The left side is indicated by an arrow L.

  The motorcycle 100 of FIG. 1 may typically be for so-called off-road use, and a steering head pipe 101 is disposed at the front upper part of the vehicle body, and a steering shaft (not shown) is disposed in the steering head pipe 101. Is pivotably inserted. A steering wheel 102 is attached to the upper end of the steering shaft, a front fork 103 is attached to the lower end of the steering shaft, and a front wheel 104 as a steering wheel is rotatable at the lower end of the front fork 103. Is pivotally supported.

  A pair of left and right main frames 105 extend obliquely downward from the steering head pipe 101 toward the rear of the vehicle body, and a down tube 106 extends substantially vertically downward. The down tube 106 branches right and left as a lower frame 106A in the vicinity of the lower portion, and the pair of lower frames 106A extends downward and then bends at a substantially right angle toward the rear of the vehicle body. The frame 107 is connected to each rear end portion of the main frame 105.

  In a space surrounded by the pair of left and right main frames 105, the down tube 106, the lower frame 106A, and the body frame 107, a water-cooled engine 10 as a drive source is mounted. A fuel tank 108 is disposed above the engine 10, and its fuel supply port is plugged by a cap 109. A seat 110 is disposed behind the fuel tank 108. A radiator 111 is disposed in front of the engine 10.

  A front end portion of the rear swing arm 112 is supported by a pivot shaft 113 so as to be able to swing up and down on a pair of left and right body frames 107 provided at a substantially lower center in the front-rear direction of the vehicle body. A rear wheel 114 as a drive wheel is rotatably supported at the rear end of the rear swing arm 112. The rear arm 112 is suspended from the vehicle body via a link mechanism 115 and a shock absorber 116 (rear wheel suspension device) connected thereto.

  A fuel pump unit is disposed in the fuel tank 108, and fuel is supplied to the engine 10 by the fuel pump unit. On the other hand, an air cleaner box 117 is disposed on the rear side of the shock absorber 116, and the air cleaner box 117 and the engine 10 are connected via an intake passage. Although not shown in FIG. 1, the intake passage is connected to an intake port provided in the cylinder head of the engine 10, and a throttle body is disposed as a part of the intake passage along the way. The throttle body is provided with a fuel injector, and fuel of a predetermined pressure is supplied from the fuel pump unit to the fuel injector.

  Next, the configuration of the engine 10 will be described. In this example, the engine 10 is a four-cycle single cylinder engine. FIG. 2 shows the overall configuration of the engine 10 in the present embodiment. In the engine 10, a crankcase 11 that rotatably accommodates and supports a crankshaft 12, a cylinder 13 that accommodates a piston in a vertically movable manner, a cylinder head 14 that accommodates a valve operating device, and a cylinder that covers the cylinder head 14. The head cover 15 is connected to the substantially vertical direction, that is, the cylinder axis of the cylinder block is set substantially in the vertical direction with respect to the axis of the crankshaft 12.

  Furthermore, it demonstrates with reference to FIGS. In the present embodiment, the crankcase 11 is divided into left and right parts along the split surface P as shown in FIG. A transmission chamber (or case) 16 is disposed on the rear side of the crank chamber 11 in the crank chamber 11 and a clutch chamber 17 is disposed on the right side, and a magnet chamber 18 is disposed on the left side. In the mission chamber 16, a plurality of mission gears for decelerating and transmitting the rotational output of the crankshaft 12 to the rear wheel 114 are arranged. A clutch device 19 (FIG. 6) is disposed in the clutch chamber 17, and power transmission between the crankshaft 12 and the transmission gear is controlled to be connected / disconnected by operating a clutch lever of the handle 102. A generator including a stator coil and a magnet rotor is disposed in the magnet chamber 18.

  Further, the crankcase 11 is divided into two parts, a right crankcase 11 a and a left crankcase 11 b along the split surface P. A crankshaft 20 shown in FIG. 3 and a pair of left and right crank webs 21 that rotate integrally with the crankshaft 12 are rotatably supported in the crankcase 20 in the crankcase 11. A connecting rod is connected between the crank webs 21 via a crank pin. A piston is swingably attached to the tip (small end) of the connecting rod via a piston pin (not shown), and reciprocates up and down in the cylinder.

  A clutch chamber 17 is disposed adjacent to the right side of the right crankcase 11a by attaching a clutch cover 22. A magnet chamber 18 is disposed adjacent to the left crankcase 11b by attaching a magnet cover 23 to the left side of the left crankcase 11b. A generator (not shown) is disposed in the magneto chamber 18.

  Next, the intake / exhaust system of the engine 10 will be described. First, on the intake side, an intake passage is arranged between the air cleaner box 117 and the cylinder head 14 of the engine 10 as described above. This intake passage is connected to an intake port 24 (see FIG. 2) provided in the cylinder head 14 of the engine 10, and a throttle body is disposed as a part of the intake passage in the middle thereof. The throttle body is provided with a fuel injector, and fuel of a predetermined pressure is supplied from the fuel tank 108 to the fuel injector.

  Further, on the exhaust side of the intake / exhaust system, an exhaust pipe 25 is connected to the exhaust port 25 (see FIG. 2) disposed in the cylinder head 14, and the exhaust gas after combustion generated by the engine 10 passes through the exhaust pipe. Exhausted. The exhaust pipe further extends to the rear of the engine 10 as an exhaust pipe and is coupled to the muffler 118. The exhaust is finally discharged from the muffler 118.

  Next, the cooling system of the engine 10 will be described. A radiator 111 is mounted in front of the engine 10. Although not shown, the cooling water cooled by the radiator 111 is guided to the water pump 26 (see FIG. 4) through a hose. The water pump 26 feeds the cooling water to a water jacket formed in a cylinder block or the like of the engine 10 via a hose. Thereby, the engine 10 is cooled.

  In the valve train of the engine 10, the engine 10 of this embodiment is a so-called DOHC type. The cylinder head 14 has cam shafts 27 and 28 on the intake side and the exhaust side, respectively (see the broken line shown in FIG. 2). A cam chain 29 is mounted in a substantially vertical direction at the left side portion of the engine 10 (see the broken line shown in FIG. 2), and the crankshaft 12 and the camshafts 27 and 28 are connected via the cam chain 29. .

  Next, the lubrication system of the engine 10 will be described. As shown in FIG. 3, a scavenge pump 30 (oil pump) is disposed near the lower portion of the magneto chamber 18, and the engine oil accumulated in the magneto chamber 18 is sucked from the suction port 31. The scavenge pump 30 supplies engine oil sucked from the magneto chamber 18 to the mission chamber 16 via a communication path (not shown). In the mission chamber 16, a feed pump (oil pump) (not shown) having a rotating shaft that is concentric with the scavenge pump 30 and rotates synchronously is disposed. Referring to FIG. 5, the feed pump 32 is disposed so that the right side portion is exposed near the lower portion of the clutch chamber 17, and the engine chamber 10, the cylinder 13, the crankcase 11, etc. The engine oil is supplied to each part.

  After lubricating the camshafts 27 and 28, the engine oil supplied to the valve operating chamber is dropped and collected mainly at the bottom of the magneto chamber 18. The engine oil supplied to the cylinder 13 and the crankcase 11 mainly flows into the bottom of the crank chamber 20 after lubricating the piston, the crankshaft 12 and the like. The engine oil flowing into the bottom of the crank chamber 20 is transferred to the magnet chamber 18 adjacent to the oil storage chamber via the oil storage chamber, the reed valve, and the oil passage. The engine oil transferred to the magneto chamber 18 is again sucked up by the scavenge pump 30 as described above, and is repeatedly supplied to the mission chamber 16.

  Here, transmission of engine driving force will be described. FIG. 5 is a right side view of an engine to which the breather device according to the present invention is applied, and shows the clutch chamber with the clutch device 19 and the clutch cover 22 removed. The engine 10 according to the present invention includes a crankshaft 12 disposed at the front portion of the crankcase 11 and a countershaft 33 disposed behind the crankshaft 12. One end of the crankshaft 12 protrudes into the clutch chamber 17, and a primary drive gear 34 is attached to this end. The counter shaft 33 constitutes a part of a transmission (transmission) housed in the rear part of the crankcase 11, and a clutch assembly, that is, a clutch device 19 is provided at an end protruding to the clutch chamber 17 side.

  The clutch device 19 includes a housing 35, a pressure plate 36, and a plurality of clutch plates 37 accommodated between the pressure plates 36. Further, on the left side of the clutch device 19, a ring gear 38 and a kick driven gear 39 are disposed in order on the counter shaft 33. The ring gear 38 and the kick driven gear 39 are mounted so as to be rotatable relative to the counter shaft 33.

  The crankshaft 12 starts rotating when the engine 10 is started, and the primary drive gear 34 mounted on the end of the crankshaft 12 also rotates together. The primary drive gear 34 meshes with a ring gear 38 attached to the counter shaft 33, and is configured to transmit the driving force of the crankshaft 12 to the clutch device 19. As described above, the clutch device 19 is a multi-plate clutch including a plurality of clutch plates 37, and is configured so that the pressure contact or separation between the clutch plates 37 can be selectively determined by the operation of the driver. The driving force of the crankshaft 12 is transmitted to the countershaft 33 when the clutch plate 37 is in pressure contact.

  Next, transmission of power by kick start will be described. The engine 10 according to the present invention includes a so-called kick-type starter that rotates the crankshaft 12 by kicking down a kick lever provided for the engine 10. The kick starter includes a kick driven gear 39 disposed on the counter shaft 12, a kick idle gear 40 disposed behind the kick driven gear 39, and a kick drive disposed above the kick idle gear 40. The gear 41 includes a kick lever 42 that is connected to the rotation shaft of the kick drive gear 41 and extends to the right of the engine 10.

  The kick drive gear 41 is housed in a gear case 43 in which a half portion is formed integrally with the right crankcase 11a and the clutch cover 22, respectively. Further, a return spring 45 of the kick lever 42 is mounted around the support shaft 44 of the kick lever 42, and the kick lever 42 after kicking is returned to the original position by the return spring 45.

  The kick idle gear 40 meshes with the kick drive gear 41 and the kick driven gear 39, respectively. When starting the engine 10 in a kick manner, when the driver kicks down the kick lever 42, the kick drive gear 41 first rotates, and then the kick idle gear 40, the kick driven gear 39, and the primary drive gear 34 are driven in this order. As a result, the crankshaft 12 rotates.

  Now, the breather device of the present invention will be described. In FIG. 5, the breather device 46 of the present invention is disposed substantially obliquely above and behind the countershaft 33. FIG. 7 shows a cross-sectional configuration of the breather device 46. The breather device 46 is an upper rear portion of the clutch chamber 17, and is a gas collection chamber 47 formed in the crankcase 11 and a gas-liquid separator disposed at a position facing the opening 47 a of the gas collection chamber 47. 48. The air collecting chamber 47 includes a recessed portion 49 formed on the side wall of the crankcase 11 that constitutes a part of the engine case, and a breather shaft 50 having a hollow tube shape fixed to the recessed portion 49. The The gas-liquid separator 48 includes a breather gear 51 that is rotatably mounted on the breather shaft 50 and a breather cover 52 that is fitted to one side of the breather gear 51.

  More specifically, the air collecting chamber 47 is formed by recessing the side wall of the crankcase 11, and one end of the breather hose 53 is connected to the air collecting chamber 47. The other end of the breather hose 53 is connected to an intake system (for example, an air cleaner), and is configured to return the blow-by gas in the clutch chamber 17 to the intake side.

  The breather shaft 50 is formed in a hollow tube shape from a metal or a resin material, and one end of the tube is inserted into the air collecting chamber 47 and fixed. A breather gear 51 is rotatably mounted on the other end of the breather shaft 50 via a bearing 54. FIG. 8 shows a configuration example of the breather gear 51 alone, and meshes with the kick drive gear 41 disposed behind the breather gear 51 in a side view as shown in FIG. When the engine is started and the kick-driven gear 39 starts to rotate, the driving force is transmitted in the order of the kick idle gear 40, the kick drive gear 41, and the breather gear 51 to be driven to rotate. Further, as shown in FIG. 8, the breather gear 51 is provided with a concave portion 55 having a circular inner diameter D on one side surface, and the concave portion 55 is arranged facing the opposite side to the breather shaft 50. A plurality of apertures 56 are formed in the circumferential surface corresponding to the bottom surface of the recess 55.

  As shown in FIG. 9, the breather cover 52 has a plate-like member formed in a circular cup shape or a dish shape, and the opening side of the cup shape is directed toward the breather shaft 50 to close the concave portion 55 of the breather gear 51. To be fitted. Further, in this fitted state, the breather cover 52 is disposed with an opening end of the breather shaft 50, that is, an opening 47a and a gap g. The gap g is provided so that the open end of the breather shaft 50 protrudes from the recess 55 of the breather gear 51 toward the breather cover 52, and a slight gap is formed between the breather cover 52 and the breather shaft 50. . More preferably, if the open end of the breather shaft 50 is close enough to protrude to the inside of the cup-shaped inner space of the breather cover 52, it is possible to efficiently recover the gas after gas-liquid separation described later.

  Further, the cup-shaped bottom portion of the breather cover 52 is formed to be substantially flat, but the cup-shaped inner peripheral side surface is formed to be uneven, that is, a plurality of groove portions 57 are formed along the radial direction of the breather shaft 50. Is done. These groove portions 57 are arranged corresponding to the openings 56 of the breather cover 52.

  In the above case, the breather gear 51 is positioned and fixed by the circlip 58, and the breather cover 52 is positioned and fixed by the circlip 59.

  In the above-described configuration, some blow-by gas is generated in this type of engine 10, and as a specific entry path of blow-by gas, first, when the engine 10 is started, it passes between the combustion chamber of the cylinder 13 and the piston. It enters the crankcase 11. Next, it passes through the reed valve and reaches the magneto chamber 18 on the left side of the crankcase 11, and then enters the mission chamber 16 from the magneto chamber 18 through the scavenge pump 30. Further, it enters the clutch chamber 17 from the mission chamber 16 through the communication hole 58 (see FIG. 5).

  In the engine 10 of the present invention, a breather device 46 is disposed in the clutch chamber 17 into which blow-by gas enters. As shown in FIG. 7, when the oil (or oil mist) and blow-by gas mixture (arrow X) accumulated in the clutch chamber 17 is drawn into the air collecting chamber 47, the breather cover 52 mainly has a groove. Since it is effectively captured by the concavo-convex action of 57, it is efficiently centrifuged. The oil component (arrow Y) separated in this way travels along the breather gear 51 and finally drops downward, while the blow-by gas after separation is drawn into the air collecting chamber 47 (arrow Z). Further, by setting the gap g between the breather cover 52 and the breather shaft 50 to be narrow as described above, the blow-by gas is reliably brought into contact with the groove portion 57 of the breather cover 52, thereby improving the gas-liquid separation performance. Can do.

Further, the characteristic operation and effect of the present invention will be described. First, it has a gas-liquid separator 48 and a gas collection chamber 47 in which blow-by gas after gas-liquid separation is collected. In this case, the gas-liquid separator 48 is a plate. The cup-shaped member is formed in a cup shape, and the cup-shaped opening side is arranged to face the opening end 47 a of the air collecting chamber 47.
Thereby, since it is a simple structure compared with the conventional structure and blow-by gas can be suck | inhaled from a cup-shaped opening side, the collection | recovery efficiency of blow-by gas can be improved significantly.

Moreover, the opening end 47a of the air collecting chamber 47 is disposed inward of the cup-shaped opening.
Thereby, since the gas-liquid separator 48 and the opening end 47a can be provided close to each other, the blow-by gas can be reliably brought into contact with the gas-liquid separator 48, and the performance can be improved. Moreover, since it can suppress that the gas after gas-liquid separation returns in an engine case again, gas can be collect | recovered efficiently.

The gas-liquid separator 48 further includes a breather gear 51 that is a gear member that is rotationally driven by engine power, and the cup-shaped outer peripheral end portion is configured to fit into the recess 55 of the breather gear 51.
Thereby, the gas-liquid separator 48 is deformed by centrifugal force during the operation of the engine. This deformation returns to the original shape when the engine 10 is stopped in the initial state of the engine start, but the shape may be destroyed by repeatedly using the engine 10 and the original performance may be impaired. Then, if it comprises like the said structure, it can prevent that a member deform | transforms with a centrifugal force. Moreover, weight reduction can also be achieved by forming a member with a softer material, for example, resin.

The gas-liquid separator 48 is disposed in the clutch chamber 17 of the engine 10 and includes other rotating members such as a kick driven gear 39 and a kick idle gear 40 below the gas-liquid separator 48 in a side view of the engine. .
Thereby, by providing the rotating shaft below the gas-liquid separator 48, the engine oil separated by the gas-liquid separator 48 is dropped on the sliding portion of the rotating shaft or the gear provided on the rotating shaft. And is effectively lubricated.

As mentioned above, although this invention was demonstrated with various embodiment, this invention is not limited only to these embodiment, A change etc. are possible within the scope of the present invention.
Although the example in which the breather gear 51 is meshed with the kick drive gear 41 has been described, it can be functionally meshed with the kick driven gear 39.
The positioning (thrust presser) of the breather gear 51 can also be realized by adding a thrust presser structure to the primary driven gear assembly, or the presser member of the breather gear 51 may be provided alone in the crankcase.

DESCRIPTION OF SYMBOLS 10 Engine, 11 Crankcase, 11a Right side crankcase, 11b Left side crankcase, 12 Crankshaft, 13 Cylinder, 14 Cylinder head, 16 Mission chamber, 17 Clutch chamber, 18 Magnet chamber, 19 Clutch device, 20 Crank chamber, 21 Crank Web, 22 Clutch cover, 23 Magnet cover, 24 Intake port, 25 Exhaust port, 26 Water pump, 27, 28 Cam shaft, 29 Cam chain, 30 Scavenge pump, 31 Suction port, 32 Feed pump, 33 Counter shaft, 34 Primary Drive gear, 35 housing, 36 pressure plate, 37 clutch plate, 38 ring gear, 39 kick driven gear, 40 kick idle gear, 41 key Gear drive gear, 42 kick lever, 44 spindle, 45 return spring, 46 breather device, 47 air collection chamber, 48 gas-liquid separator, 50 breather shaft, 51 breather gear, 52 breather cover, 53 breather hose, 53 breather hose, 54 bearing , 55 recesses, 56 openings, 57 grooves, 100 motorcycles.

Claims (3)

A rotary gas-liquid separator that gas-liquid separates the blow-by gas in the engine case, and a gas collection chamber in which the blow-by gas after gas-liquid separation is collected,
The air collecting chamber is composed of a recessed portion formed on the side wall of the crankcase, and a breather shaft fixed to the recessed portion.
The gas-liquid separator is composed of a breather gear rotatably mounted on the breather shaft, and a breather cover fitted on one side of the breather gear.
The breather cover of the gas-liquid separator is formed by forming a plate-like member in a cup shape, and the cup-shaped opening side is disposed so as to face the opening end of the air collecting chamber ,
The opening end of the air collecting chamber is disposed inward of the cup-shaped opening,
The breather gear of the gas-liquid separator is rotationally driven by engine power, and the cup-shaped outer peripheral end portion of the breather cover is fitted in the concave portion of the breather gear.   2. The breather device for an engine according to claim 1, wherein the gas-liquid separator is disposed in a clutch chamber of the engine, and has another rotating member below the gas-liquid separator in a side view of the engine. 2. The breather apparatus for an engine according to claim 1, wherein a concave and convex groove portion is formed on an inner side surface of the cup-shaped separator of the gas-liquid separator toward an opening diameter direction of the air collecting chamber.

Images