JP3887232B2 - Engine balancer equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a balancer device for an engine in which an oil discharge hole is formed in a balancer housing disposed below a crankshaft.
[0002]
[Prior art]
Such an engine balancer device is known from Japanese Utility Model Publication No. 6-29476.
[0003]
Japanese Utility Model Publication No. 6-29476 discloses that oil accumulated in the balancer housing is lifted up by a rotating balancer weight and discharged to the outside through an oil discharge hole formed in the upper surface of the balancer housing. ing.
[0004]
[Problems to be solved by the invention]
By the way, what is described in Japanese Utility Model Publication No. 6-29476 is that the crankshaft and the connecting rod are located above the oil discharge hole of the balancer housing, so that the oil discharged from the oil discharge hole is transferred to the crankshaft and the connecting shaft. Colliding with the rod, there was a problem that oil mist was generated and rotational resistance increased.
[0005]
The present invention has been made in view of the above circumstances, and an object thereof is to prevent oil discharged from an oil discharge hole of a balancer housing from colliding with a crankshaft or a connecting rod.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the invention described in claim 1, in the balancer device of the engine in which the oil discharge hole is formed in the balancer housing disposed below the crankshaft, the oil is discharged from the oil discharge hole. An oil blocking wall that prevents the oil from hitting the crankshaft or the connecting rod is formed by extending the inner wall of the crankcase inward, and the upper part of the oil discharge hole is covered with a cover member. An engine balancer device characterized by being wrapped in the direction of oil discharge with a barrier wall is proposed.
[0007]
According to the above configuration, the oil discharged from the oil discharge hole of the balancer housing is prevented from hitting the crankshaft or the connecting rod by the oil blocking wall formed by extending the inner wall of the crankcase inward. Further, it is possible to prevent the occurrence of oil mist and the increase in rotational resistance without increasing the number of assembly steps.
[0009]
In addition , since the cover member that covers the upper part of the oil discharge hole and the oil blocking wall are wrapped in the oil discharging direction, the oil discharged from the oil discharging hole can be reduced in the crankshaft or It can be surely prevented from hitting the connecting rod.
[0010]
According to a second aspect of the present invention, in addition to the structure of the first aspect , the crankcase is a lower block in which a bearing cap is integrally formed, and a crank is formed between the adjacent bearing caps by the oil blocking wall. An engine balancer device characterized by being connected in the axial direction of the shaft is proposed.
[0011]
According to the above configuration, the crankcase is configured by the lower block in which the bearing cap is integrally formed, and the oil blocking wall formed in the crankcase connects the adjacent bearing caps in the axial direction of the crankshaft. Thus, the support rigidity of the crankshaft can be increased.
[0012]
The lower block 14 of the embodiment corresponds to the crankcase of the present invention, and the first and third baffle plates 47 and 49 of the embodiment correspond to the cover member of the present invention.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
[0014]
1 to 12 show an embodiment of the present invention, FIG. 1 is a front view of an engine, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is a sectional view taken along line 3-3 of FIG. 4 is a sectional view taken along line 4-4 in FIG. 2, FIG. 5 is a sectional view taken along line 5-5 in FIG. 3, FIG. 6 is a sectional view taken along line 6-6 in FIG. 8 is a sectional view taken along line 8-8 in FIG. 6, FIG. 9 is a sectional view taken along line 9-9 in FIG. 6, FIG. 10 is a sectional view taken along line 10-10 in FIG. 11-11 is a sectional view taken along line 11, and FIG. 12 is a sectional view taken along line 12-12 of FIG.
[0015]
As shown in FIG. 1, the outline of the in-line four-cylinder engine E for a vehicle is configured by stacking a head cover 11, a cylinder head 12, a cylinder block 13, a lower block 14, and an oil pan 15 from above to below. The cylinder axis L is inclined to the exhaust side (left side in the figure) with respect to the vertical direction. The secondary balancer device 16 fixed to the lower surface of the lower block 14 and accommodated in the oil pan 15 includes a drive-side balancer shaft 18 and a driven balancer shaft 19 supported by a balancer housing 17. A sprocket 21 provided at the shaft end of the crankshaft 20 supported between the lower blocks 14 and a sprocket 22 provided at the shaft end of the drive-side balancer shaft 18 are connected by an endless chain 23.
[0016]
As shown in FIGS. 2 to 5, the four pistons 25 slidably fitted to the four cylinder bores 24 provided on the cylinder block 13 are respectively connected to the four pins 20 a of the crankshaft 20. It is connected via connecting rods 26. Five bearing caps 27... Integrally formed (cast) inside the lower block 14 are fastened to the lower surface of the cylinder block 13 by two bolts 28, 28. The five journals 20b of the crankshaft 20 are rotatably supported between the bearing caps 27.
[0017]
The balancer housing 17 of the secondary balancer device 16 connects the upper housing 29 and the lower housing 30 with eleven bolts 31... 32, 32; 33, 33; 34a, 34a, 34b, 34b. A pump housing 35 is coupled to one end of the housing 30 with a plurality of bolts 36. An upper wall portion 30 b that extends to the upper surface side of the balancer housing 17 is formed at the end portion of the lower housing 30 on the pump housing 35 side, and the upper wall portion 30 b is sandwiched between the upper housing 29 and the pump housing 35. At this time, a slit-shaped opening α (FIGS. 6, 8 and 9) is formed between the upper housing 29 and the upper wall portion 30 b of the lower housing 30.
[0018]
Three bolts 31 arranged so as to sandwich the drive balancer shaft 18 and the driven balancer shaft 19 are inserted from the upper housing 29 side and fastened to the lower housing 30. The two bolts 32, 32 arranged outside the drive balancer shaft 18 and the two bolts 33, 33 arranged outside the driven balancer shaft 19 are inserted from the upper housing 29 side and are inserted into the lower housing 30. To be concluded. Further, two bolts 34 a and 34 a inserted into the pump housing 35 on one end side of the balancer housing 17 pass through the bearing cap 27 and are fastened to the lower surface of the cylinder block 13, and on the other end side of the balancer housing 17. Two bolts 34 b and 34 b inserted from the housing 30 side pass through the upper housing 29 and the bearing cap 27 and are fastened to the lower surface of the cylinder block 13.
[0019]
The upper housing 29 is supported on the bearing caps 27 and 27 by four mounting seats 29a through which the four bolts 34a, 34a, 34b and 34b pass, and accordingly, the upper surface of the upper housing 29 and the bearing caps 27 and 27 are supported. A gap β (see FIG. 4) is formed between the lower surface and the lower surface.
[0020]
Next, the structure of the secondary balancer device 16 will be further described based on FIGS.
[0021]
As is apparent from FIG. 8, the drive balancer shaft 18 of the secondary balancer device 16 has the sprocket 22, the first journal 18a, the drive gear 18b, the first balancer weight 18c, from one end side to the other end side. A second journal 18 d and a second balancer weight 18 e are provided, and the first and second journals 18 a and 18 d are supported so as to be sandwiched between the upper housing 29 and the lower housing 30. As is apparent from FIG. 9, the driven balancer shaft 19 of the secondary balancer device 16 has a first journal 19a, a driven gear 19b, a first balancer weight 19c, and a second journal 19d from one end side to the other end side. The second balancer weight 19e is provided, and the first and second journals 19a and 19d are supported so as to be sandwiched between the upper housing 29 and the lower housing 30.
[0022]
An oil pump 41 (see FIG. 9) is provided at one end of the driven balancer shaft 19 that protrudes into the pump housing 35. The oil pump 41 includes a known trochoid pump, and includes an inner rotor 42 fixed to the driven balancer shaft 19 and an outer rotor 43 that is rotatably supported by the pump housing 35 and meshes with the inner rotor 42. A strainer 44 positioned below the oil level O of the oil stored in the oil pan 15 is provided on the lower surface of the lower housing 30, and the strainer 44 and the suction port 41 a of the oil pump 41 are integrated with the lower surface of the lower housing 30. They are connected by the formed oil passage 30a (see FIG. 12). The strainer 44 includes a strainer element 44a that filters foreign matters in the oil, and a strainer cover 44b that covers the strainer element 44a. The discharge port 41b of the oil pump 41 is connected to the main gallery 13a (see FIGS. 3 and 4) of the cylinder block 13 through an oil passage (not shown).
[0023]
The upper housing 29 has a pair of openings 29b and 29b facing the drive gear 18b and the driven gear 19b, a pair of openings 29c and 29c facing the first balancer weights 18c and 19c, and a pair facing the second balancer weights 18e and 19e. The openings 29d and 29d are formed. By providing these openings 29b, 29b; 29c, 29c; 29d, 29d, the locus T (see FIG. 3) of the lower end of the connecting rod 26 is prevented from interfering with the upper surface of the upper housing 29. The engine E can be downsized. Further, openings 17 a and 17 b (see FIG. 10) facing the shaft ends of the drive balancer shaft 18 and the driven balancer shaft 19 straddle the upper housing 29 and the lower housing 30 on the end surface of the balancer housing 17 opposite to the pump housing 35. Formed. The openings 17a and 17b are for machining the support portions of the first and second journals 18a and 19a; 18d and 19d of the drive balancer shaft 18 and the driven balancer shaft 19 inside the balancer housing 17, and the openings The inner diameters of 17a and 17b are slightly larger than the outer diameters of the first and second journals 18a and 19a; 18d and 19d.
[0024]
At the end of the upper housing 29 on the drive balancer shaft 18 side, four oil discharge holes 45a to 45d opened on the upper surface thereof are formed. Each of the oil discharge holes 45 a to 45 d is formed in a long hole shape extending in the axial direction of the crankshaft 20. One (or a plurality) of slit-like oil discharge holes 46 extending along the mating surfaces of the upper housing 29 and the lower housing 30 are formed at the end of the balancer housing 17 on the driven balancer shaft 19 side. The oil discharge holes 45a to 45d open in the direction of the cylinder axis L, and the oil discharge port 46 opens in a direction perpendicular to the cylinder axis L. Due to the inclination of the cylinder axis L, the balancer housing 17 is inclined so that the drive balancer shaft 18 side is lowered and the driven balancer shaft 19 side is raised. However, the oil discharge ports 45a to 45d and the driven balancer shaft on the drive balancer shaft 18 side are inclined. The oil discharge port 46 on the 19th side is disposed at a position higher than the oil level O (see FIG. 3) of the oil stored in the oil pan 15.
[0025]
A substantially rectangular first baffle plate 47 is fastened together with the two bolts 32, 32 connecting the upper housing 29 and the lower housing 30 to the upper surface of the end portion of the upper housing 29 on the drive balancer shaft 18 side. A substantially rectangular second baffle plate 48 is fastened together with the two bolts 33, 33 connecting the upper housing 29 and the lower housing 30 to the upper surface of the end portion of the housing 29 on the driven balancer shaft 19 side. The number of parts and the fastening space can be reduced. Further, a U-shaped third baffle plate 49 is fixed to the lower surface of the lower block 14 with four bolts 50.
[0026]
Thus, the rotation of the crankshaft 20 is transmitted to the drive balancer shaft 18 through the sprocket 21, the endless chain 23 and the sprocket 22 by the operation of the engine E, and the rotation of the drive balancer shaft 18 is transmitted through the drive gear 18b and the driven gear 19b. To the driven balancer shaft 19. At this time, the number of teeth of the sprocket 21 of the crankshaft 20 is set to twice the number of teeth of the sprocket 22 of the drive balancer shaft 18, and the number of teeth of the drive gear 18b is set equal to the number of teeth of the driven gear 19b. Therefore, the drive balancer shaft 18 and the driven balancer shaft 19 rotate in opposite directions at a rotational speed twice that of the crankshaft 20 (see arrows A and B in FIGS. 11 and 12), and the drive balancer shaft 18 The secondary vibration of the engine E is reduced by the first and second balancer weights 18c, 19c; 18e, 19e provided on the driven balancer shaft 19.
[0027]
Since the crankshaft 20 splashes up the oil in the crankcase during the operation of the engine E, the oil tends to enter the balancer housing 17 through the openings 29b, 29b; 29c, 29c; 29d, 29d; 17a, 17b. To do. When oil enters the balancer housing 17, the drive gear 18b, the driven gear 19b, the first and second balancer weights 18c, 19c; 18e, 19e, and the like are agitated to increase the agitation resistance. Accordingly, the drive balancer shaft 18 rotating in the directions of arrows A and B in FIG. 11 and the drive gear 18b of the driven balancer shaft 19, the driven gear 19b, the first and second balancer weights 18c, 19c; 18e, 19e, etc. The oil is discharged from the oil discharge holes 45 a to 45 d of the balancer housing 17 to the outside and returned to the oil pan 15, thereby preventing the stirring resistance from increasing.
[0028]
As apparent from FIG. 3, an oil blocking wall 14a extends inwardly from the inner wall of the lower block 14 constituting a part of the crankcase, and this oil blocking wall 14a and the first baffle plate 47 (and the third baffle plate 47) The cover 49a) of the baffle plate 49 wraps by a distance ε when viewed in the oil discharge direction from the oil discharge holes 45a to 45d. Accordingly, the oil discharged from the oil discharge holes 45a to 45d is blocked by the first baffle plate 47 and the oil blocking wall 14a, or blocked by the cover portion 49a and the oil blocking wall 14a of the third baffle plate 49, Collision with the shaft 20 and the connecting rod 26 is prevented, and generation of oil mist and an increase in rotational resistance are avoided.
[0029]
Since the oil blocking wall 14a is provided at the lowermost end portion of the lower block 14, the mounting rigidity of the oil pan 15 is also improved. Also, the lower block 14 integrally provided with the bearing caps 27 constitutes the crankcase, and the oil blocking wall 14a of the lower block 14 connects the adjacent bearing caps 27 in the axial direction of the crankshaft 20, so that the oil blocking The wall 14a can increase the support rigidity of the crankshaft 20. In the embodiment, the oil blocking wall 14a connects adjacent bearing caps 27 ... adjacent to the lower block 14, but the bearing caps 27 ... may be directly connected.
[0030]
In particular, the oil blocking wall 14a and the first baffle plate 47 (or the cover part 49a of the third baffle plate 49) are wrapped by a distance ε, so that the first baffle plate 47 (or the cover part of the third baffle plate 49) is wrapped. Compared with the case where 49a) is not provided, the protruding amount of the oil blocking wall 14a can be reduced. Moreover, since the oil blocking wall 14a is configured by extending a part of the lower block 14, it is possible to avoid an increase in the number of parts and an increase in the number of assembling steps as compared with the case where the oil blocking wall 14a is configured as a separate member. Can do.
[0031]
As shown in FIGS. 10 to 12, the outer end edges of the first and second baffle plates 47 and 48 and the outer end edges of the cover portions 49a and 49b of the third baffle plate 49 are bent downward. The oil discharged from the oil discharge holes 45 a to 45 d and 46 can be changed in the downward direction and smoothly returned to the oil pan 15.
[0032]
Due to the first baffle plate 47 and the second baffle plate 48 fixed to the balancer housing 17 and the third baffle plate 49 fixed to the lower block 14, the oil level O of the oil stored in the oil pan 15 is ramped. Is prevented. When the splash of oil splashed with the rotation of the crankshaft 20 is scattered inside the crankcase, the oil discharge holes 45a to 45d and 46 of the balancer housing 17 are formed in the first to third baffle plates 47 to 47. 49, it is possible to prevent the oil splash from being blocked by the first to third baffle plates 47 to 49 and entering the balancer housing 17 from the oil discharge holes 45a to 45d and 46. .
[0033]
In particular, the U-shaped third baffle plate 49 has a pair of cover portions 49a and 49b formed with a notch 49c interposed therebetween, and one cover portion 49a covers one oil discharge port 45d. In addition, the weight of the third baffle plate 49 can be reduced by the notch 49c while the other cover 49b covers a part of the oil outlet 46. In addition, two of the four bolts 50... For fixing the third baffle plate 49 to the lower block 14 are disposed closer to the cover portions 49a and 49b than the notch portion 49c. Therefore, the cover portions 49a and 49b. The rigidity can be increased to suppress vibration.
[0034]
As mentioned above, although the Example of this invention was explained in full detail, this invention can perform a various design change in the range which does not deviate from the summary.
[0035]
For example, in the embodiment, the first and second baffle plates 47 and 48 are fixed to the balancer housing 17, and the third baffle plate 49 is fixed to the lower block 14, but their mounting positions can be changed as appropriate. .
[0036]
In the embodiment, oil discharged from the oil discharge holes 45a to 45d is blocked by both the first baffle plate 47 (or the cover part 49a of the third baffle plate 49) and the oil blocking wall 14a. If the protrusion amount of 14a is increased, the first baffle plate 47 (or the cover portion 49a of the third baffle plate 49) can be eliminated.
[0037]
The cover member of the present invention is not limited to the baffle plate, and may be a dedicated cover member.
[0038]
【The invention's effect】
As described above, according to the first aspect of the present invention, the oil discharged from the oil discharge hole of the balancer housing is formed by extending the inner wall of the crankcase inward so as to hit the crankshaft or the connecting rod. Since it is blocked by the oil blocking wall, it is possible to prevent the generation of oil mist and the increase in rotational resistance without increasing the number of parts and the number of assembly steps.
[0039]
The addition and the cover member in particular covers the top of the oil discharge hole and the oil shut-off wall, so was wrapped in the discharge direction of the oil, while keeping small the amount of projection of the oil blocking wall, the oil discharged from the oil discharge hole crank It can be reliably prevented from hitting the shaft or the connecting rod.
[0040]
According to the second aspect of the present invention, the crankcase is constituted by the lower block in which the bearing cap is integrally formed, and the oil shielding wall formed in the crankcase is arranged between the adjacent bearing caps in the axial direction of the crankshaft. Since they are connected, the support rigidity of the crankshaft can be increased by the oil blocking wall.
[Brief description of the drawings]
1 is a front view of an engine. FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1. FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. 3 is a sectional view taken along line 5-5 in FIG. 3. FIG. 6 is a sectional view taken along line 6-6 in FIG. 2. FIG. 7 is a sectional view taken along line 7-7 in FIG. 9 is a sectional view taken along line 9-9 in FIG. 6. FIG. 10 is a sectional view taken along line 10-10 in FIG. 6. FIG. 11 is a sectional view taken along line 11-11 in FIG. Line cross section [Explanation of symbols]
14 Lower block (Crankcase)
14a Oil blocking wall 17 Balancer housing 20 Crankshaft 26 Connecting rod 27 Bearing cap 45a Oil discharge port 45b Oil discharge port 45c Oil discharge port 45d Oil discharge port 47 First baffle plate (cover member)
49 3rd baffle plate (cover member)

Claims (2)

In an engine balancer device in which oil discharge holes (45a to 45d) are formed in a balancer housing (17) disposed below the crankshaft (20),
An oil blocking wall (14a) for preventing oil discharged from the oil discharge holes (45a to 45d) from hitting the crankshaft (20) or the connecting rod (26) is provided with the inner wall of the crankcase (14) facing inward. Extended and formed ,
The upper part of the oil discharge hole (45a to 45d) is covered with a cover member (47, 49), and the cover member (47, 49) is wrapped with the oil blocking wall (14a) in the oil discharge direction. An engine balancer device . The crankcase (14) is a lower block integrally formed with a bearing cap (27), and the bearing cap (27) adjacent to each other is connected in the axial direction of the crankshaft (20) by the oil blocking wall (14a). The balancer device for an engine according to claim 1 , wherein

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