JPH0774662B2 - 2-axis balancer device for vehicle engine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vehicle in which a pair of balancer shafts arranged on both sides of a crankshaft are rotated by the crankshafts to balance inertial forces of a reciprocating body or the like. TECHNICAL FIELD The present invention relates to a two-axis balancer device for a commercial engine.

(Prior Art and Problems Thereof) Conventionally, as a two-shaft type balancer device for such a vehicle engine, for example, there is a technique disclosed in Japanese Utility Model Publication No. 58-13166. This technique includes an engine oil pump formed by a drive gear and a driven gear, and a drive gear shaft mounted with the drive gear is interlocked with a crankshaft, and a driven gear shaft mounted with the driven gear is connected to the crankshaft of the crankshaft. By forming the balancer shaft so as to also serve as one of the pair of balancer shafts arranged on the left and right, the one balancer shaft is configured to be reversely driven with respect to the other balancer shaft, thereby making the entire engine compact. At the same time, the cost is reduced.

However, in the case where the conventional vehicle engine lubrication system is a dry sump system, the oil accumulated in the reserve tank is pumped up and supplied to the main gallery (main oil passage communicating with each lubrication part of the engine). In addition to the feed pump (corresponding to the oil pump), a scavenging pump for pumping the oil returned to the oil pan under the crankcase and sending it to the reserve tank is required. Alternatively, it must be driven by a belt different from the timing belt, which causes a problem that the structure of the dry sump type engine lubrication system becomes complicated and the cost increases.

(Object of the Invention) The present invention has been made by paying attention to such conventional problems, and one of a pair of balancer shafts of a two-shaft balancer device is a scavenging pump and the other is a feed pump. For vehicles that use it to simplify the structure of the dry sump type engine lubrication system, reduce the number of parts, reduce cost, and achieve stable drive of scavenging pump gear meshing. An object is to provide a two-shaft balancer device for an engine.

(Structure of the Invention) A two-shaft balancer device for a vehicle engine according to the present invention for achieving the above object includes a pair of balancer shafts arranged on both sides of a crankshaft, which are rotated by the crankshaft to reciprocate. In a two-shaft type balancer device for a vehicle engine that balances inertial forces such as the above, a dry sump type engine lubrication system including a scavenging pump and a feed pump is provided, and the drive gear shafts of both pumps are respectively provided on the crank shaft. Interlockingly, one of the pair of balancer shafts is arranged coaxially with the drive gear shaft of the scavenging pump, and the other of the pair of balancer shafts is arranged coaxially with the drive gear shaft of the feed pump. Or arranged as a driven gear shaft of the feed pump, The scavenging pump comprises two sets of gear pumps each having an individual strainer consisting of a drive gear mounted on the drive gear shaft and two driven gears arranged on both sides of the drive gear. The pump is characterized by forming a gear pump including a drive gear mounted on the drive gear shaft and a driven gear.

(Operation) In the two-shaft balancer device for a vehicle engine, when the drive gears of the scavenging pump and the feed pump rotate in association with the rotation of the crankshaft, both pumps are driven and a pair of Both balancer shafts are rotated.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 4 show a first embodiment of the present invention in which the present invention is applied to a biaxial type secondary balancer device (biaxial type balancer device), and FIG. 2 is a cross section of FIG. It is a figure.

As shown in FIGS. 1 and 2, a two-shaft secondary balancer device 2 is provided in an engine body 1 of a motorcycle (vehicle) engine, and a scavenging pump that constitutes a dry sump type engine lubrication system. 3 and the feed pump 4 are mounted.

As shown in FIG. 1, the secondary balancer devices 2 are arranged on both sides of the crankshaft 5 and are respectively provided with balancers 6a and 7a.
A pair of left balancer shaft 6 and right balancer shaft 7 (see FIGS. 3 and 4) are provided,
The pair of balancer shafts 6 and 7 are mutually rotated by the crankshaft 5 to balance the primary inertial force of a reciprocating body such as a piston and a connecting rod and the inertial force of a secondary component or more.

The secondary balancer device 2 is arranged coaxially with the pulley 8 mounted on the crankshaft 5 and the drive gear shaft 31a (see FIG. 3) of the drive gear 31 of the scavenging pump 3 and in parallel with the crankshaft 5. The left balancer shaft 6 mounted, the left pulley 9 mounted on the drive gear shaft 31a, the right pulley 10 mounted on the drive gear shaft 41a (see FIG. 4) of the drive gear 41 of the feed pump 4, and the crank The right balancer shaft 7 arranged parallel to the shaft 5 and as a driven gear shaft of the driven gear 42 of the feed pump 4, a tensioner 11, and teeth on both sides, and wound around the pulleys 8, 9, 10 and the tensioner 11. Drive belt 12 and

As shown in FIG. 2 and FIG. 3, the scavenging pump 3 pumps up the recirculated oil into an oil pan 13 attached to the lower portion of the engine body 1,
It is sent to a reserve tank 14 arranged separately from 13. This scavenging pump 3 has a drive gear 31
And two driven gears 32 and 33 arranged on both sides of the drive gear 31, respectively. That is, the drive gear 31 and the driven gear 32 cause the first gear pump to operate as the drive gear 31 and the driven gear.
A second gear pump is constituted by 33 and 33, respectively. Drive gear 31 and driven gears 32 and 33 are pump case 34
The pump case 34 is housed inside, and is fixed to the engine body 1 by bolts 34a. Pump case 34
A lid 35 is attached to an end surface of the engine main body 1 side, and the driven gears 32 and 33 are rotatably supported on the lid 35, and the through hole 35a of the lid 35 has a left balancer shaft 6 of the left balancer shaft 6. The tip portion 6b penetrates. The tip 6b
Is press-fitted into the hole 31b of the drive gear 31, and the left balancer shaft 6 and the drive gear 31 rotate integrally.

Drive gear shaft 31 of the scavenging pump 3
The a penetrates the boss hole 34b of the pump case 34 and projects to the outside of the pump case 34, and a seal member 15 seals between the boss hole 34b and the drive gear shaft 31a. The left pulley 9 is fastened to the tip of the drive gear shaft 31a by a fastening nut 16. The tightening nut 16, the left pulley 9 and the drive belt 12 are covered with a cover 17 mounted on the pump case 34.

The pump case 34 of the scavenging pump 3 has two
One of the pair of gear pumps (the first gear pump) has a first suction port 34c which is a suction port, the other (the second gear pump) has a second suction port 34d which is a suction port, and a discharge port 34e. Has been formed. In the pump case 34, the first
A first inflow passage 34f that communicates with the suction port 34c, a first outflow passage 34g that communicates with the discharge port 34e, and a second communication passage that communicates with the second suction port 34d.
An inflow path 34h and a second outflow path 34i that intersects with the second inflow path 34h and intersects with the first outflow path 34g near the discharge port 34e are formed. The strainers 18, 19 arranged at the left and right corners of the oil pan 13 are provided at the first and second suction ports 34c, 34d, respectively.
The oil that has passed through is introduced via pipes 20 and 21, respectively,
The oil discharged from the discharge port 34d is sent into the reserve tank 14 via the pipe 22.

As shown in FIGS. 2 and 4, the feed pump 4
Is for pumping up the oil accumulated in the reserve tank 14 and pumping it to the main gallery.
And a driven gear 42 meshing with the drive gear 41. The drive gear 41 and the driven gear 42 are housed in a pump case 43, and the pump case 43 is fixed to the engine body 1 by bolts 43a. A cover is attached to the end surface of the pump case 43 on the engine body 1 side.
44 is installed. The tip portion 7b of the right balancer shaft 7 penetrates through the through hole 44a of the lid 44, and the tip portion 7b is press-fitted into the hole 42a of the driven gear 42 so that the right balancer shaft 7 and the driven gear 42 are integrally formed. Made to rotate. In this way, the right balancer shaft 7 is arranged as the driven gear shaft of the driven gear 42.

The drive gear shaft 41a of the feed pump 4 is
The pump case 4 passes through the boss hole 43b of the pump case 43
3 protrudes outside, and a seal member 23 seals between the boss hole 43b and the drive gear shaft 41a. The right pulley 10 is fastened to the tip of the drive gear shaft 41a by a fastening nut 24. The tightening nut 24, the right pulley 10 and the drive belt 12 are covered with a cover (not shown) attached to the pump case 43.

In the pump case 43 of the feed pump 4, there are an intake port 43c into which oil that has passed through a strainer 25 arranged in the reserve tank 14 is introduced through a pipe 26, and a discharge port 43d that communicates with the main gallery. Has been formed. In the pump case 43, an inflow passage 43e communicating with the suction port 43c is provided.
And an outflow passage 34f communicating with the discharge port 43d.

Next, the operation of the two-shaft type secondary balancer device having the above configuration will be described.

When the engine is driven and the crankshaft 5 rotates counterclockwise as shown by the solid arrow in FIG. 1, this rotation is transmitted to the left pulley 9 and the right pulley 10 by the drive belt 12, and the pulleys 9, 10 rotations are scavenging pump 3
And each drive gear shaft 31a, 41 of the feed pump 4
Each of the drive gears 31 and 41 is transmitted via a to the drive gears 31 and 41, and both drive gears 31 and 41 rotate clockwise as indicated by the broken line arrow in FIG. When the drive gear 31 rotates clockwise, the left balancer shaft 6 is driven by the drive gear.
It rotates in the same direction as 31. Meanwhile, drive gear 41
Is rotated clockwise, the driven gear 42 is rotated counterclockwise, and the right balancer shaft 7 is also rotated counterclockwise integrally with the driven gear 42. In this way, the secondary balancer device 2 is driven so that the left balancer shaft 6 and the right balancer shaft 7 rotate in opposite directions in association with the rotation of the crankshaft 5, and the balancer 6a of both balancer shafts 6, 7 is driven. , 7a balances the primary inertial force of a reciprocating body such as a piston and a connecting rod and the inertial force of a secondary component or more.

Further, when the drive gear 31 rotates clockwise in FIGS. 1 and 2, both driven gears 32 and 33 of the scavenging pump 3 rotate counterclockwise in FIG. 2 and the scavenging pump 3 moves. As the drive gear 41 is driven and rotates clockwise in the figure, the driven gear 42 of the feed pump 4 rotates counterclockwise in the figure and the feed pump 4 is driven.

By driving the scavenging pump 3, the drive gear 31 and the driven gear 32 of the scavenging pump 3 are driven.
The first gear pump constituted by
Strainer 18 and pipe in the left corner
The second gear pump, which is pumped from the first suction port 34c through the first suction port 34c into the first inflow passage 34f and is constituted by the drive gear 31 and the driven gear 33 of the scavenging pump 3, is the oil in the oil pan 13. Is pumped into the second inflow passage 34h from the second suction port 34d through the strainer 19 and the pipe 21 in the right corner. A part of the oil introduced into the first inflow passage 34f by the first gear pump is part of the first outflow passage 34g by the driven gear 32 as shown by an arrow in FIG.
It is pumped in and the rest is pumped by the drive gear 31 into the second outflow passage 34i. On the other hand, a part of the oil introduced into the second inflow passage 34h by the second gear pump is
As shown by the arrow in FIG. 2, the drive gear 31 feeds the first outflow passage 34g under pressure, and the driven gear 33 feeds the remainder through the second outflow passage 34i into the first outflow passage 34g. The oil thus pressure-fed into the first outflow passage 34g is discharged from the discharge port 34e and is pressure-fed into the reserve tank 14 through the pipe 22.

On the other hand, the oil pumped into the reserve tank 14 by the scavenging pump 3 by the drive of the feed pump 4 passes through the strainer 25 and the pipe 26, and the suction port 43c.
As indicated by the arrow, the oil is pumped into the inflow passage 43e, the pumped oil is pumped into the outflow passage 43f by both gears 41 and 42, and further pumped from the discharge port 43d to the main gallery to lubricate each part of the engine. To do. The oil that has lubricated the various parts of the engine returns to the oil pan 13 again.

According to the first embodiment, the left balancer shaft 6 of the secondary balancer device 2 is arranged coaxially with the drive gear 31 of the scavenging pump 3, and the drive gear 31
By configuring the scavenging pump 3 by arranging the two driven gears 32, 33 on both sides of the 31, the arrangement and layout of the two driven gears 32, 33 can be facilitated, and
Since an even load is applied to the driven gears 32 and 33, there is an advantage that the engagement between the driven gears 32 and 33 and the drive gear 31 is stable and the driving of the scavenging pump 3 is stable.

Further, according to the first embodiment, the scavenging pump 3 is two sets of gear pumps configured by the drive gear 31 and the two driven gears 32, 33 arranged on both sides of the drive gear 31, And scavenging pump 3
Of the oil pan 13 by the first gear pump (a pump formed by the drive gear 31 and the driven gear 32)
Pumps up the oil in the left corner of the scavenging pump 3 and drives the second gear pump (drive gear 31
And a driven gear 33) are used to pump up the oil in the right corner of the oil pan 13, so that the oil inside the oil pan 13 is loaded by the load acting when the vehicle bends sharply or is accelerated suddenly. , So that even if one of the first and second gear pumps sucks in air, the other gear pump can reliably pump up the oil in the oil pan 13 and the scavenging pump 3 There is an advantage that the driving efficiency can be stabilized.

Next, a second embodiment of the present invention will be described with reference to FIG.

In this second embodiment, the present invention is applied to a two-axis type primary balancer device (two-axis type balancer device). That is, in this two-shaft type primary balancer device 2 ′, the pair of balancer shafts 6, 7 is connected to the crankshaft 5 by the crankshaft 5.
The left balancer shaft 6 is a drive gear of the scavenging pump 3 in the same manner as in the above-described first embodiment by counter-rotating both with respect to each other to balance the primary inertial force of a reciprocating body such as a piston and a connecting rod. It is arranged coaxially with the drive gear shaft (31a) of 31 and the right balancer shaft 7 is also the drive gear of the feed pump 4.
It is arranged coaxially with the drive gear shaft (41a) of 41. The other structure is similar to that of the first embodiment.

In the second embodiment, when the crankshaft 5 rotates counterclockwise as shown by the solid arrow in FIG. 5 due to the driving of the engine, the drive gear 31 and the feed of the scavenging pump 3 and the feed are interlocked with the crankshaft 5. Both drive gears 41 of the pump 4 rotate clockwise as shown by the broken line arrow in FIG. 5, and this rotation causes both the left balancer shaft 6 and the right balancer shaft 7 of the primary balancer device 2'to rotate clockwise. Thus, the primary inertial force of the reciprocating body such as the piston and the connecting rod is balanced. Other operations are similar to those of the first embodiment.

(Effects of the Invention) According to the two-shaft balancer device for a vehicle engine according to the present invention, the structure of a dry sump type engine lubrication system configured by the scavenging pump and the feed pump can be simplified and its components can be simplified. The number of points can be reduced, which can reduce the cost, and can achieve stable driving of the meshing of the gears of the scavenging pump.

[Brief description of drawings]

1 to 4 show a first embodiment of the present invention,
1 is a plan view showing a schematic arrangement of a biaxial type secondary balancer device, FIG. 2 is a longitudinal sectional view of FIG. 1, and FIG. 3 is of FIG.
A sectional view taken along line III-III, FIG. 4 is a sectional view taken along line IV-IV in FIG. 2, and FIG. 5 is a plan view similar to FIG. 1 showing a second embodiment of the present invention. 2 ... 2-axis type secondary balancer device (2-axis type balancer device), 2 '... 2-axis type primary balancer device (2-axis type balancer device), 3 ... Scavenging pump, 4 ... Feed Pumps, 5 ... Crank shafts, 6, 7 ... Pair of balancer shafts (6 ... Left balancer shafts, 7 ... Right balancer shafts), 31a ... Scavenging pump drive gear shafts, 41a. Drive gear shaft.

Claims (1)

[Claims] 1. A scavenging pump for a two-shaft balancer device for a vehicle engine in which a pair of balancer shafts arranged on both sides of a crankshaft are rotated by the crankshaft to balance inertial forces of a reciprocating body or the like. And a feed pump, a dry sump type engine lubrication system is provided, each drive gear shaft of both pumps is interlocked with the crank shaft, and one of the pair of balancer shafts is connected to the drive gear shaft of the scavenging pump. And the other of the pair of balancer shafts is disposed coaxially with the drive gear shaft of the feed pump or as a driven gear shaft of the feed pump. Drive gear mounted on the drive gear shaft And two driven gears arranged on both sides of the drive gear, each of which forms two sets of gear pumps each having an individual strainer, and the feed pump includes a drive gear and a driven gear mounted on the drive gear shaft. A two-shaft balancer device for a vehicle engine, characterized in that a gear pump consisting of