JP6090151B2 - engine - Google Patents

Description

  The present invention is an engine in which a balancer device and an oil pump unit are attached, and a power transmission device is provided that transmits rotational power of a crankshaft to the oil pump unit and transmits the rotational power to the balancer device via the oil pump unit. About.

  For example, Patent Document 1 discloses a configuration in which a balancer device and an oil pump unit are assembled on the lower surface of a lower block of a cylinder block of an engine and attached with bolts.

  The balancer device and the oil pump unit are assembled by fastening the housing of the balancer device and the housing of the oil pump unit with bolts in a state where they are arranged side by side.

  The rotation of the crankshaft of the engine is transmitted to the oil pump unit, and is transmitted to the balancer device via the oil pump unit, whereby the pump shaft of the oil pump unit and the drive side balancer of the balancer device are transmitted. The shaft and the driven balancer shaft are driven to rotate. Power transmission from the pump shaft to the drive-side balancer shaft is performed by a drive gear attached to the pump shaft and a driven gear attached to the drive-side balancer shaft.

JP 2010-230129 A

  In the case of the conventional example according to Patent Document 1, the following problems are pointed out.

  Generally, it is necessary to change the pump capacity of the oil pump unit depending on the engine displacement. For this reason, when an oil pump unit with a different pump capacity is replaced, the outer diameter of the pump shaft varies from unit to unit, so the center axis of the pump shaft is different from the center axis of the drive-side balancer shaft. Will shift. Due to this relationship, each of the oil pump units having different pump capacities cannot be coupled to a specific balancer device. For this reason, it is necessary to prepare a dedicated product (an assembly of an oil pump unit and a balancer device) for each engine displacement.

  By the way, as a power transmission form between the balancer device and the oil pump unit, a power transmission shaft in which a male spline is formed is used instead of the form using the drive gear and the driven gear. In the case of engaging with each female spline hole formed on the balancer shaft, the pump needs to be secured due to the need to secure installation space for each spline on both the pump shaft and the drive-side balancer shaft. It is not preferable because the outer diameters of the shaft and the drive-side balancer shaft need to be made larger than in the case of Patent Document 1.

  In view of such circumstances, the present invention is provided with a balancer device and an oil pump unit, and transmits rotational power of a crankshaft to the oil pump unit and also to the balancer device via the oil pump unit. In an engine provided with a power transmission device, when changing the pump capacity, only the oil pump unit can be changed to eliminate the waste of changing the oil pump unit and the balancer device as a set. The purpose is that.

  The present invention is an engine in which a balancer device and an oil pump unit are attached, and a power transmission device is provided that transmits rotational power of a crankshaft to the oil pump unit and transmits the rotational power to the balancer device via the oil pump unit. The drive gear attached to the pump shaft of the oil pump unit is meshed with the driven gear attached to the drive-side balance shaft of the drive-side and driven-side balance shafts provided in the balancer device. The balancer device and the oil pump unit are separately attached to the engine.

  In this configuration, when the pump capacity is changed, the oil pump unit can be changed by changing only the oil pump unit. Therefore, as described in the conventional example, the oil pump unit and the balancer device are combined as a set. It is possible to eliminate the waste of changing.

  As a result, as described in the conventional example, it is not necessary to prepare a dedicated product (an assembly of the oil pump unit and the balancer device) for each engine displacement.

  Preferably, the balancer device stores the driving-side and driven-side balance shafts in a balancer housing in a rotatable state, and one end side in the axial direction of the driving-side balance shaft protrudes outside the balancer housing. The driven gear is provided in the protruding portion, the balancer housing is provided with a bolt insertion hole into which a bolt for mounting to the engine is inserted, and the oil pump unit pumps the pump shaft. One end in the axial direction of the pump shaft is supported on the housing and protrudes to the outside of the pump housing, and the drive gear is provided on the protruding portion. The pump housing is for mounting to the engine. A bolt insertion hole into which a bolt is inserted is provided.

  In the engine according to the present invention, when the pump capacity of the oil pump unit is changed, only the oil pump unit can be changed, so that the oil pump unit and the balancer device as described in the conventional example can be used. It becomes possible to eliminate the waste of exchanging them as a set.

It is a side view showing simply the appearance of one embodiment of the engine concerning the present invention. It is a top view which shows the coupling | bonding form of the balancer apparatus and oil pump unit in FIG. FIG. 3 is a cross-sectional view taken along line (3)-(3) in FIG. 2.

  BEST MODE FOR CARRYING OUT THE INVENTION Best modes for carrying out the present invention will be described in detail below with reference to the accompanying drawings.

  1 to 3 show an embodiment of the present invention. In the figure, 1 indicates the entire engine.

  In the engine 1, a cylinder head 3 is attached to the upper part of the cylinder block 2, and a balancer device 10 and an oil pump unit 20 are separately attached to the lower part of the lower block 4 of the cylinder block 2.

  An oil pan 5 is attached to the lower part of the cylinder block 2 so as to cover the balancer device 10 and the oil pump unit 20.

  The balancer device 10 has a configuration in which a pair of drive side and driven side balance shafts 11 and 12 are housed in a balancer housing 13 in a rotatable state.

  The drive-side and driven-side balance shafts 11 and 12 are provided so as to be parallel to the crankshaft 6, and balance weights 11a, 11b, 12a, and 12b are provided at two locations in the middle of the respective axial directions. .

  One axial end side of the drive side and driven side balance shafts 11 and 12 (the front end side of the engine 1, that is, the side close to the oil pump unit 20) protrudes outside the balancer housing 13, and is interlocked with both protruding portions. Gears 14 and 15 are provided. The interlocking gears 14 and 15 are helical gears and mesh with each other.

  The balancer housing 13 includes a front bearing wall portion 13a that supports the front journal portions 11c and 12c of the drive side and driven side balance shafts 11 and 12, and a rear side journal portion 11d and the drive side and driven side balance shafts 11 and 12, respectively. A rear bearing wall 13b that supports 12d and a bolt insertion hole 13c into which a bolt (not shown) for attachment to the engine 1 is inserted are provided, for example, an aluminum die-cast product. Although not shown, the upper surface of the balancer housing 13 is open, and a cover is attached to the open portion.

  The oil pump unit 20 has a configuration in which a pump shaft 21 is supported by a pump housing 22.

  The pump shaft 21 is rotated by the rotational power of the crankshaft 6. As the operation of the oil pump unit 20, the oil in the oil pan 5 is shown in the crankshaft 6 or the figure by the misalignment between the inner rotor (not shown) connected to the pump shaft 21 and the outer rotor (not shown). Pump to no camshaft etc.

  The pump housing 22 is provided with a bolt insertion hole 22a into which a bolt (not shown) for attachment to the engine 1 is inserted. As shown in FIG. 3, an oil strainer 23 is attached to the pump housing 22.

  The drive-side and driven-side balance shafts 11 and 12 of the balancer device 10 and the pump shaft 21 of the oil pump unit 20 are arranged in the longitudinal direction of the engine 1 so as to be parallel to each other, as shown in FIGS. They are arranged side by side. Further, a pump shaft 21 is offset on the drive-side balance shaft 11 on the opposite side of the driven-side balance shaft 12 (one side in the left-right direction of the engine 1). The side balance shaft 11 is disposed in such a manner that the front end side predetermined length region overlaps in the left-right direction of the engine 1.

  A power transmission device 30 is provided on the front end side of the engine 1. The power transmission device 30 transmits the rotational power of the crankshaft 6 to the oil pump unit 20 and also transmits the rotational power of the crankshaft 6 to the balancer device 10 via the oil pump unit 20, so that both the oil pump unit 20 and the balancer device 10 are transmitted. Is to drive.

  The power transmission device 30 includes a crank sprocket 31, a pump sprocket 32, a chain 33, a drive gear 34, and a driven gear 35.

  The crank sprocket 31 is attached to one end side in the axial direction of the crankshaft 6 (the front end side of the engine 1). The pump sprocket 32 is attached to one axial end side (front end side of the engine 1) of the pump shaft 21 of the oil pump unit 20. The chain 33 is wound around the crank sprocket 31 and the pump sprocket 32.

  The drive gear 34 is integrally attached to one end side in the axial direction of the pump shaft 21 that protrudes outside the pump housing 22 (the rear end side of the engine 1, that is, the side close to the balancer device 10).

  The driven gear 35 is integrally attached to the outer side of the interlocking gear 14 at the protruding portion of the drive-side balance shaft 11. The driven gear 35 is a small-diameter gear having half the number of teeth of the crank sprocket 31 and the drive gear 34. As a result, the drive-side and driven-side balance shafts 11 and 12 are rotated at a rotational speed that is twice the rotational speed of the engine 1.

  The drive gear 34 and the driven gear 35 are helical gears and mesh with each other.

  In general, the pump capacity of the oil pump unit 20 needs to be changed depending on the displacement of the engine 1. For this reason, when the existing oil pump unit 20 is changed to a new oil pump unit 20 having a different pump capacity, the outer diameters of the old and new pump shafts 21 are different from each other. The central axes of the pump shafts 21 having different outer diameters are shifted from the central axis of the drive-side balance shaft 11. Even in such a case, in this embodiment, since the oil pump unit 20 is not coupled to the balancer device 10 as in Patent Document 1, the oil pump unit 20 and the balancer device 10 are combined as in Patent Document 1. There is no need to replace the set, and only the oil pump unit 20 needs to be replaced.

  As described above, in the present embodiment to which the present invention is applied, the balancer device 10 and the oil pump unit 20 are separately attached to the engine 1, and the balancer housing 13 and the pump housing 22 are not fastened.

  As a result, when the pump capacity of the oil pump unit 20 is changed, the oil pump unit 20 and the balancer device 10 can be accommodated by changing only the oil pump unit 20 as described above. It is possible to eliminate the waste of changing and in a set.

  Therefore, it is not necessary to prepare a dedicated product (an assembly of the oil pump unit 20 and the balancer device 10) for each displacement of the engine 1 as described in the conventional example.

  In addition, in this embodiment to which the present invention is applied, since the balancer housing 13 and the pump housing 22 are not fastened as in Patent Document 1, the fastening portion between the balancer housing 13 and the pump housing 22 as in Patent Document 1 is used. This will not affect the backlash between the drive gear 34 and the driven gear 35.

  Specifically, in the case of Patent Document 1, in addition to the error in the fastening portion between the pump housing 22 and the lower block 4, the error in the fastening portion between the balancer housing 13 and the pump housing 22 is caused between the drive gear 34 and the driven gear 35. While this affects the backlash variation, in the case of this embodiment, only the error in the fastening portion between the pump housing 22 and the lower block 4 affects the backlash variation between the drive gear 34 and the driven gear 35. become.

  As described above, in this embodiment, even if the oil pump unit 20 having a different pump capacity is used for each displacement of the engine 1, the backlash between the drive gear 34 and the driven gear 35 varies for each displacement of the engine 1. Can be suppressed.

  Note that the present invention is not limited to the configuration described in the above embodiment, and can be appropriately changed within the scope of the claims and a scope equivalent to the scope.

  The present invention is an engine in which a balancer device and an oil pump unit are attached, and a power transmission device is provided that transmits rotational power of a crankshaft to the oil pump unit and transmits the rotational power to the balancer device via the oil pump unit. It is possible to use suitably.

1 engine
2 Cylinder block
4 Lower block
10 Balancer device
11 Drive-side balance shaft
12 Driven side balance shaft
13 Balancer housing
13c Bolt insertion hole 14, 15 Interlocking gear
20 Oil pump unit
21 Pump shaft
22 Pump housing
22a Bolt insertion hole
30 Power transmission device
31 Crank sprocket
32 Pump sprocket
33 belt
34 Drive gear
35 Driven gear

Claims (1)

The engine is provided with a power transmission device to which a balancer device and an oil pump unit are attached and which transmits the rotational power of a crankshaft to the oil pump unit and to the balancer device via the oil pump unit,
In a state where a drive gear attached to the pump shaft of the oil pump unit is engaged with a driven gear attached to the drive side balance shaft of the drive side and driven side balance shafts provided in the balancer device, the balancer device and the An engine, wherein an oil pump unit is separately attached to the engine.

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