JP2008115917A - Balancer device of engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a balancer device of an engine capable of being speedily exhausted from a balancer housing inside into an oil pan inside by effectively collecting a lubricating oil seeping on a baffle plate. <P>SOLUTION: An upper housing 10 and a lower housing 11 of the balancer housing 9 are partitioned into two front and rear spaces, and at the same time, the baffle plate 33 which blankets the lubricating oil surface inside the oil pan in the upper end part of the upper housing, is set integrally. In a region where one space of the baffle plate is located, a second depression 36 to collect a part of the lubricating oil seeped on the baffle plate is formed, and at the same time, the third oil exhaust hole 37 is bored in the bottom part of the depression part, and the lubricating oil dropping from the hole is made to pass through a jig passing hole 32a, and is discharged inside the oil pan. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a balancer device that effectively reduces vibrations of, for example, an automobile engine, and in particular, a balancer that can lubricate each part of the engine and quickly return the lubricating oil dropped on the balancer housing into the oil pan. Relates to the device.

  As a conventional balancer device for an automobile engine, one described in Patent Document 1 below is known.

  Briefly, the balancer device is disposed in an oil pan provided at a lower position of the cylinder block, and is disposed in parallel with each other in the balancer housing that is bolted to the lower side of the cylinder block. And a pair of drive side and driven side balancer shafts whose front and rear positions are rotatably supported by a bearing portion.

  The balancer housing is composed of upper and lower upper housings and a lower housing, and a baffle plate is integrally provided on the upper housing.

  The baffle plate is formed in a substantially rectangular shape so as to cover the entire surface of the lubricating oil stored in the oil pan, and has a substantially rectangular cross section with a substantially central portion in the engine width direction being depressed. It is bent. A plurality of openings for allowing the lubricating oil dropped from the crank chamber to flow down into the oil pan are formed on both sides of the baffle plate across the central depression.

When the crankshaft is driven to rotate by starting the engine, the drive side shaft is driven to rotate at a rotational speed twice that of the crankshaft through the sprockets and the chain, and meshes with this as the drive side gear rotates. The driven gear rotates in the opposite direction to drive the driven shaft in the direction opposite to the driving shaft. Thereby, secondary vibration of the engine is effectively suppressed by rotation of each balance weight.
Japanese Patent Laid-Open No. 6-17879 (FIG. 1)

  In the conventional balancer device, lubricating oil dropped in the crank chamber by providing a plurality of openings in the baffle plate is introduced into the oil pan through a separate opening provided in the upper housing (ceiling wall). It comes to discharge. As described above, since the lubricating oil dropped on the upper surface of the upper housing is discharged into the oil pan from a separate opening provided in the upper housing, the lubricating oil is quickly discharged from the upper portion of the balancer housing into the oil pan. Can not be discharged, and the discharge efficiency is reduced. As a result, the rotation load of the crankshaft due to the lubricating oil and the increase of air mixing in the lubricating oil may be caused, and the circulation efficiency of the lubricating oil in the oil pan may be reduced.

  The present invention has been devised in view of the actual situation of each of the conventional balancer devices, and effectively collects the lubricating oil dropped on the baffle plate and causes it to flow down into the balancer housing. It aims at providing the balancer apparatus of the engine which can discharge | emit quickly into the oil pan from.

According to a first aspect of the present invention, there is provided a balancer housing which is accommodated and disposed in an oil pan provided on the lower side of the crankshaft in the gravitational direction, and is constituted by an upper housing and a lower housing, the upper housing and the lower housing, A plurality of bearing portions provided between the balancer housing and at least two front and rear spaces, a baffle plate provided in the upper housing and covering a lubricating oil surface in an oil pan, and the balancer A balance shaft that is rotatably provided in the housing via the plurality of bearings and transmits a rotational force from the crankshaft; a balancer weight that is provided on the balance shaft and cancels vibrations of the engine; and Part of the lubricating oil dropped on the baffle plate is removed from the space on the one side. An oil discharge means for discharging the oil into the oil pan, and the lower housing is formed at a position where the other side space is formed, and the assembly jig is moved downward when assembling the parts to the balance shaft. An engine balancer device having a jig insertion hole for insertion from
A recess is formed at a position where the other space portion of the baffle plate is located, and the upper housing penetrates the upper housing from above and below at the bottom of the recess portion and passes through the other space portion. It is characterized in that a discharge hole communicating with the tool insertion hole is provided.

  According to the present invention, a part of the lubricating oil dripped from the crank chamber onto the upper surface of the baffle plate through the inside of the engine is discharged into the oil pan through the space on one side by one oil discharging means. The other lubricating oil gathers in the recess and drops as it is into the space on the other side from the discharge hole, and a large portion of the lubricating oil falls into the oil pan through the jig insertion hole.

  Therefore, a part of the lubricating oil that has passed through the engine is quickly returned to the oil pan without staying in the recess of the upper housing, so that it is possible to prevent the rotation load of the crankshaft from being caused by the lubricating oil. it can.

  In particular, according to the present invention, the lubricating oil can be discharged by the second oil discharging means constituted by the discharge hole or the like in addition to being discharged into the oil pan by one oil discharging means. Recovery to the oil pan can be performed uniformly throughout, and the lubricating oil can be circulated efficiently.

  In addition, in the present invention, the jig insertion hole formed in the lower housing is used as it is as the lubricating oil discharge hole, and only the discharge hole is formed in the upper housing, so that the rigidity of the balancer housing is secured. This facilitates the manufacturing operation and is advantageous in terms of cost.

  According to a second aspect of the present invention, the jig formed on the lower housing is formed on the balance shaft with a jig fitting portion for restricting free rotation at the time of assembly by a bifurcated jig. Two insertion holes are formed on the left and right sides in accordance with the bifurcated jig, and one jig insertion hole is formed below the discharge hole of the upper housing in the direction of gravity. Yes.

  According to the present invention, since the drive shaft can be directly rotationally fixed in addition to the same function and effect as in the first aspect of the invention, there is a technical effect that a load is not applied to the balancer housing when the parts are assembled to the balance shaft. .

  The invention described in claim 3 is characterized in that the vertical positions of the discharge hole and the jig insertion hole are matched.

  According to the present invention, by matching the positions of the discharge hole and the jig insertion hole, the lubricating oil that has flowed into the discharge hole from the recess of the upper housing passes through the jig insertion hole as it is, Since it is dripped in the pan, the lubricating oil can be discharged quickly.

  Hereinafter, an embodiment in which a balancer device according to the present invention is applied to an in-line four-cylinder engine for a vehicle will be described with reference to the drawings.

  That is, as shown in FIG. 5, a ladder frame 3 made of an aluminum alloy material having a bearing portion that supports the crankshaft 2 is fixed to the lower surface of the cylinder block 1 of the engine, and a lower portion of the ladder frame 3. In addition, an oil pan 4 is attached. The oil pan 4 has an oil pan cover 4a at a lower end portion, and a balancer device 5 is accommodated therein.

  The crankshaft 2 has a large-diameter crank sprocket 7 attached to a support shaft 6 integrally provided at a front end portion, and a drive pulley 8 attached to the tip end side thereof. In FIG. 5, reference numeral 20 denotes a tension mechanism that applies a constant tension to the drive chain 17 described later.

  As shown in FIGS. 5 to 7, the balancer device 5 includes a balancer housing 9 including an upper housing 10 and a lower housing 11 which are fastened together by a plurality of bolts 24 to the lower surface of the ladder frame 3, and the upper and lower A drive-side drive shaft 12 and a driven-side driven shaft 13 which are balance shafts that are rotatably supported between the housings 10 and 11 and are arranged in parallel in the longitudinal direction of the engine, and the shafts 12 and 13. A helical drive side gear 14 and a driven side gear 15 that are fixed to the rear end side and meshed with each other are provided.

  As shown in FIG. 6, the drive shaft 12 is formed with a relatively long shaft length, and large-diameter journal portions 12a to 12c are formed on the front end portion, the central portion, and the rear end side in the axial direction. . The drive shaft 12 is fixed to a front end by a fixing bolt 23 in which a balancer sprocket 16 is screwed from the axial direction, and an endless drive chain wound around the balancer sprocket 16 and the crank sprocket 7. Rotational force from the crankshaft 2 is transmitted via 17. Further, the front end portion of the drive shaft 12 is formed with two-side-width fitting portions 12d and 12e into which a rotation restricting bifurcating jig described later is fitted.

  Further, the drive shaft 12 has three large-diameter journal portions 12a to 12c formed in three axial directions between the upper housing 10 and the lower housing 11, respectively. It is rotatably supported by 25a-25c via half-plane bearings 18a, 18b, 18c.

  Further, two balancer weights 19a and 19b are integrally provided between the rear end side journal portions 12b and 12c of the drive shaft 12 and at the rear end portion. Both shafts 12 and 13 are set to rotate twice per rotation of the crankshaft 2.

  On the other hand, the driven shaft 13 is formed in a short length of about 2/3 of the drive shaft 12, and the large-diameter journal portions 13a and 13b formed at two locations in the axial direction include the housings 10, 11 is rotatably supported by two bearing portions 26a and 26b provided between 11 through half-plane plain bearings 21a and 21b.

  Further, two balancer weights 22a and 22b are integrally provided between the journal portions 13a and 13b of the driven shaft 13 and at the rear end thereof.

  The balancer housing 9 is internally divided into at least a central first space portion 27 and a front-side second space portion 28 by front and rear bearing portions 25a, 25b, 25c, 26a, and 26b.

  As shown in FIG. 6, the lower housing 11 supplies lubricating oil between the plain bearings 18a to 18c and 21a and 21b and the journal portions 12a to 12c, 13a and 13b on the upper surface of the outer peripheral portion. Oil passage grooves 29 and 30 are formed.

  The lower housing 11 is located in the first space 27 and communicates with the bottom wall between the shafts 12 and 13 with the first space 27 and the inside of the oil pan 4. As shown in FIG. 8, the bifurcated tip portions 31a and 31b of the jig 31 are inserted into the bottom wall located in the second space portion 28 from the lower side. Two insertion windows 32a and 32b each having a substantially square shape, which are two insertion windows, are vertically formed.

  The first oil discharge hole 31 is formed in a long hole shape in the front-rear direction, and the width on the front end side is set larger than that on the rear end side.

  As described above, when the balancer sprocket 16 is attached to the front end portion of the drive shaft 12 by the bolt 23, the jig 31 is connected to the two end portions 31a and 31b of the drive shaft 12 as shown in FIG. The bolts 23 are fitted to the fitting portions 12d and 12e having a surface width to restrict free rotation and secure the tightening force of the bolts 23.

  On the other hand, as shown in FIGS. 1 and 2, the upper housing 10 is integrally formed with a baffle plate 33 formed at the upper end so as to cover the oil surface of the lubricating oil.

  The baffle plate 33 has an upper surface formed in a different shape, a first recess 34 is formed at a position located in the first space 27, and an oil pan is formed at the bottom of the first recess 34. A second oil discharge hole 35 that communicates with the interior of 4 is formed penetrating in the vertical direction.

  As shown in FIG. 3, the second oil discharge hole 35 is formed at the same position as the first oil discharge hole 31 in the vertical direction, and the shape thereof is substantially the same as the first oil discharge hole 31. Is set. The first oil discharge hole 31 and the second oil discharge hole 35 constitute a first oil discharge means.

  In addition, the baffle plate 33 has a second recess 36 formed in a portion located in the second space 28, and communicates with the second space 28 at the bottom of the second recess 36. A circular third oil discharge hole 37 as a discharge hole is formed penetrating in the vertical direction.

  As shown in FIGS. 2 and 3, the third oil discharge hole 37 is formed at the same position in the vertical direction as the inner jig insertion hole 32a out of the two jig insertion holes 32a and 32b. Thus, the opening area is set larger in the inner jig insertion hole 32a.

  In addition, a reinforcing rib 38 is integrally provided in the vicinity of the outer peripheral side top position of the recessed portion 36 of the baffle plate 33, that is, at the upper position where the drive shaft 12 is located. Arranged along the axial direction, the front and rear end edges are respectively coupled to the bulging portions 39a and 39b formed on the baffle plate 33 for escaping the gear portion.

  The third oil discharge hole 37, the second space 28, and the jig insertion hole 32a constitute second oil discharge means.

  The first and second oil discharge holes 31 and 35, the third oil discharge hole 37, and the jig insertion holes 32a and 32b are formed together when the upper housing 10, the baffle plate 33, and the lower housing 11 are molded. Is formed.

  Therefore, according to this embodiment, the lubricating oil that has lubricated each sliding portion of the engine and dropped or flowed down from the crank chamber to the upper surface of the baffle plate 33 has an inclined shape of the first recess 34 on the center side. It is collected along the inner surface, passes through the second oil discharge hole 35, passes through the first oil discharge hole 31, and is quickly discharged into the oil pan 4.

  On the other hand, on the front end side of the baffle plate 33, as shown by the arrow in FIG. 4, the lubricating oil is effectively collected by the second recess 36 and enters the second space 28 from the third oil discharge hole 37. Then, the liquid is dripped, passes through the same as it is, and is quickly discharged into the oil pan 4 through the one jig insertion hole 32a.

  As described above, most of the lubricating oil that has flowed down to the upper surface of the baffle plate 33 quickly passes through the first to third oil discharge holes 35, 31, 37 and the second space 28 from the respective recesses 34, 36. Therefore, the rotation load of the crankshaft 2 caused by the lubricating oil on the baffle plate 33 can be prevented.

  Further, since the lubricating oil is collected in the oil pan 4 by the first and second oil discharging means, the whole can be uniformly and efficiently performed, and the lubricating oil can be circulated efficiently. Is possible.

  Moreover, since the jig insertion holes 32a and 32b formed in the lower housing 11 are used as they are as the lubricating oil discharge holes, and the third oil discharge holes 37 are simply formed in the upper housing 10, the balancer housing 9 Manufacturing work is facilitated while securing rigidity, and this is advantageous in terms of cost.

  Furthermore, by matching the positions of the third oil discharge hole 37 and the one jig insertion hole 32a, the lubricating oil that has flowed into the third oil discharge hole 37 from the second recess 36 of the upper housing 10 remains as it is. Since it passes through the jig insertion hole 32a and drops into the oil pan 4, the lubricating oil can be quickly discharged.

  Further, since the guide and collecting properties of the lubricating oil are improved by the recess portions 34 and 36, the discharging action from the oil discharge holes 35 and 37 and the like can be performed quickly.

  Further, since the reinforcing rib 38 is integrally provided on the baffle plate 33, the strength of the baffle plate 33 is improved by the reinforcing rib 38, and the lubricating oil on the baffle plate 33 is applied to the side surface of the reinforcing rib 38. Accordingly, the oil can be quickly discharged into the oil pan 4 because the second hollow portion 36 can be quickly guided into the third oil discharge hole 37 along the second recess 36.

  Further, since the opening area of the inner jig insertion hole 32a is set to be larger than that of the third oil discharge hole 37, the lubricating oil dropped from the third oil discharge hole 37 is retained in the second space portion. Without passing through the upper surface of the 28 lower housing 11, it can pass through the jig insertion hole 32 a as it is and can be reliably dropped into the oil pan 4.

  The first and second oil discharge holes 31 and 35, the third oil discharge hole 37, and the jig insertion holes 32a and 32b are formed when the upper housing 10, the baffle plate 33, and the lower housing 11 are molded. Since they are formed together, the molding operation is greatly improved as compared with the case where they are formed by post-processing.

  The present invention is not limited to the configuration of the above-described embodiment. For example, the shape of each oil discharge hole can be arbitrarily formed, and can be applied to various engines.

  The technical ideas other than the invention described in the claims, as grasped from the embodiment, will be described below.

  (A) The engine balancer device according to claim 2 or 3, wherein the jig fitting portion is formed in a regular polygon.

  Since the jig fitting portion is formed in a regular polygon, the rotation unbalance of the balance shaft can be prevented and the balancer performance is not affected.

  (B) The baffle plate is provided between a rotation transmission portion to which a rotational force is transmitted from the crankshaft and the balance weight. Engine balancer equipment.

  (C) The balancer device for an engine according to any one of (1) to (b), wherein a reinforcing rib is integrally provided in the vicinity of the outer peripheral side top of the recess of the baffle plate.

  The strength of the baffle plate is improved by the reinforcing ribs, and the lubricating oil on the baffle plate can be quickly guided along the side of the reinforcing ribs to the bottom of the recess, that is, into the discharge hole, so that it can be quickly discharged into the oil pan Can do.

  (D) The engine balancer device according to claim 1, wherein an opening area of the jig insertion hole is larger than an opening area of the discharge hole.

  According to this invention, the lubricating oil dropped from the discharge hole can be reliably dropped into the oil pan as it is through the jig insertion hole without adhering to the upper surface of the lower housing.

  (E) The engine balancer device according to claim 1, wherein the discharge hole and the jig insertion hole are formed together when the upper housing and the lower housing are molded.

  Since the discharge hole and the jig insertion hole are not formed by post-processing, the forming operation is facilitated.

It is a perspective view which shows the balancer apparatus of the engine which concerns on embodiment of this invention. It is a top view of the balancer device of this embodiment. It is a bottom view of the balancer device of this embodiment. It is action explanatory drawing which shows a partial cross section of the balancer apparatus of this embodiment. It is a front view showing a section of the lower part of an engine to which the balancer device of this embodiment is applied. It is a top view in the state where the upper housing of the balancer device of this embodiment was removed. It is the sectional view on the AA line of FIG. It is a partial cross section figure which shows the state which controlled the free rotation of the drive shaft with the jig | tool in this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cylinder block 2 ... Crankshaft 4 ... Oil pan 5 ... Balancer device 9 ... Balancer housing 10 ... Upper housing 11 ... Lower housing 12 ... Drive shaft 13 ... Driven shaft 19a, 19b ... Balancer weight 22a, 22b ... Balancer weight 25a- 25c ... Bearing portion 27, 28 ... First and second space portion 33 ... Baffle plate 36 ... Second recess portion 37 ... Third oil discharge hole

Claims (3)

A balancer housing which is housed and disposed in an oil pan provided on the lower side in the gravity direction of the crankshaft, and is constituted by an upper housing and a lower housing;
A plurality of bearing portions provided between the upper housing and the lower housing and separating the balancer housing into at least two front and rear spaces;
A baffle plate provided in the upper housing and covering a lubricating oil surface in the oil pan;
A balance shaft that is rotatably provided in the balancer housing via the plurality of bearing portions, and to which a rotational force from the crankshaft is transmitted;
A balancer weight provided on the balance shaft to cancel vibrations of the engine;
An oil discharging means for discharging a part of the lubricating oil dropped on the baffle plate into the oil pan through the space portion on the one side;
A jig insertion hole, which is drilled in the formation position of the space portion on the other side of the lower housing, and for inserting an assembly jig from below when assembling the parts to the balance shaft;
An engine balancer device comprising:
While forming a hollow part in the part where the space part on the other side of the baffle plate is located,
A balancer device for an engine, characterized in that an exhaust hole is provided at the bottom of the recess so as to penetrate the upper housing from above and below and communicate with the jig insertion hole through the space on the other side. The balance shaft is formed with a jig fitting portion for restricting free rotation during assembly by a bifurcated jig, and the jig insertion hole formed in the lower housing is provided with the bifurcated hole. 2. The engine according to claim 1, wherein two right and left holes are formed in accordance with the jig, and one of the jig insertion holes is formed on the lower side in the gravity direction with respect to the discharge hole of the upper housing. Balancer device. 3. The balancer device for an engine according to claim 1, wherein the vertical positions of the discharge hole and the jig insertion hole are matched.

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