JP2016089933A - Balancer device of engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a balancer device of an engine capable of incorporating an oil passage to a pump, a relief valve, a strainer and the like, independently evaluating a function of an oil pump unit, and further independently evaluating a function of a balancer before assembling an oil pump.SOLUTION: In a balancer device 10, an oil pump unit 20 integrally including an oil pump housing 21, an oil pump 23, an oil strainer 24, a pump oil passage 22 formed on the oil pump housing 21, and a relief valve disposed on the pump oil passage 22, is assembled in an upper housing 11 and a lower housing 12 in front of the lower housing 12 at a lower side of the upper housing 11. An input shaft 26 of the oil pump 23 is connected to a crank shaft of an engine E, and an output shaft 25 of the oil pump 23 is connected to a balancer shaft in a state of not generating difference in rotational frequency therebetween.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a technique of an engine balancer device.

  Conventionally, a technique in which an oil pump is disposed adjacent to an engine balancer device is known (see, for example, Patent Document 1).

JP 2000-65148 A

  In the engine balancer device described in the prior art, since the pump unit and the balance shaft unit are fastened to the front end surface of the balance shaft, the configuration around the oil pump such as the pump oil passage and the relief valve of the pump unit is the oil pump unit. (The pump oil passage is formed in the housing of the balancer device). Therefore, it has been difficult to independently evaluate the function of the oil pump unit and the function of the balancer before the oil pump is assembled.

  Therefore, in view of the problem, the present invention enables the incorporation of an oil passage, a relief valve, a strainer, and the like into the pump, the function evaluation of the oil pump unit is performed independently, and the function of the balancer before the oil pump is assembled. Provided is an engine balancer device that can be evaluated independently.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, according to a first aspect of the present invention, the upper housing fixed to the lower part of the engine, the lower housing fixed to the lower side of the upper housing and formed shorter in one longitudinal direction than the upper housing, and the upper An engine balancer comprising: at least one balancer shaft that is supported between the housing and the lower housing and receives rotational force from the one direction; and an unbalanced mass that rotates integrally with the balancer shaft. An oil pump housing, an oil pump, an oil strainer, a pump oil passage formed in the oil pump housing, and the pump oil on the one side of the lower housing below the upper housing Oil pump unit with an integrated relief valve The oil pump is assembled to the upper housing and the lower housing, the input shaft of the oil pump is connected to the crankshaft of the engine, and the output shaft of the oil pump and the balancer shaft have a rotational speed between them. They are connected so that there is no difference.

  In claim 2, the balancer shaft and the output shaft of the oil pump are formed in a two-sided width shape in which one is eccentric from the axis, and the other is eccentric from the axis and the two-sided width shape. The balancer shaft is connected to the output shaft from the oil pump by inserting the dihedral width shape into the groove shape.

  The oil passage for lubricating the oil pump passes through a filter of the engine, wherein the oil passage formed in the oil pump housing communicates with a balance shaft oil passage formed in the upper housing. And it distribute | circulates to the said oil pump via the said balance shaft oil path.

  As effects of the present invention, the following effects can be obtained.

  That is, in the engine balancer device according to the present invention, it is possible to incorporate an oil passage, a relief valve, a strainer, etc. into the pump, and the function evaluation of the oil pump unit can be performed independently, and before the oil pump is assembled. The balancer function can be evaluated independently.

The side view which shows the balancer apparatus which concerns on one Embodiment of this invention. XX sectional drawing in FIG. The YY sectional view taken on the line in FIG. The side view which shows the state which attaches a pump unit to a balancer apparatus. (A1) and (a2) are enlarged views showing a state where the output shaft of the oil pump is connected to the balancer shaft, and (b1) and (b2) are states after the output shaft of the oil pump is connected to the balancer shaft. FIG.

  Next, embodiments of the invention will be described. First, the configuration of an engine balancer device (hereinafter simply referred to as “balancer device”) 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. In this specification, the direction in the balancer apparatus 10 is defined by the direction of the arrow shown in each drawing.

  As shown in FIGS. 1 to 3, the balancer device 10 in the present embodiment has a plurality of fastening portions 18, 18... With respect to the lower part of the engine E (specifically, the lower surface of the cylinder block in the engine E). The upper housing 11 is fixed via bolts 19, 19... And the lower housing 12 is fixed to the upper housing 11 by a plurality of bolts (not shown). Between the upper housing 11 and the lower housing 12, a pair of balancer shafts, ie, a drive shaft 13L and a driven shaft 13R, which are arranged in parallel in the left-right direction of the balancer device 10, are supported and arranged by bearings. The balancer shafts 13L and 13R are assembled with unbalanced masses 14L and 14R that rotate synchronously or reversely together with the balancer shafts 13L and 13R. Further, helical gears 16L and 16R, which are transmission gears in which the teeth mesh with each other, are disposed on the rear end side of the balancer shafts 13L and 13R.

  As shown in FIG. 2, the upper housing 11 is formed in a substantially rectangular shape in plan view. A plurality of bolt insertion holes are opened in the fastening portions 18, 18... Of the upper housing 11. .. Are inserted into the bolt insertion holes and screwed into the lower surface of the engine E (the mating surface P between the upper housing 11 and the cylinder block), whereby the upper housing 11 is moved to the lower surface of the engine E. Fixed to.

  As shown in FIG. 3, the lower housing 12 is formed in a substantially rectangular shape in plan view and shorter than the upper housing 11 in one longitudinal direction, which is the longitudinal direction. Specifically, the lower housing 12 is formed so that the front side is shorter than the upper housing 11. A plurality of bolt insertion holes (not shown) are opened in the lower housing 12. The lower housing 12 is fixed to the lower surface of the upper housing 11 by inserting bolts into the bolt insertion holes and screwing the bolts into the lower surface of the upper housing 11.

  The drive shaft 13L has a front end connected to the output shaft 25 of the oil pump 23, as will be described later. A rotational driving force is transmitted to an output shaft 25 of the oil pump 23 from a crankshaft (not shown) of the engine E. The rotational driving force from the crankshaft rotates the driven shaft 13R via the output shaft 25 of the oil pump 23, the drive shaft 13L, and the helical gears 16L and 16R. That is, a rotational driving force is input to the drive shaft 13L from the front.

  As shown in FIG. 2, the drive shaft 13 </ b> L is rotatably supported by two bearings (not shown) provided between the upper housing 11 and the lower housing 12 at two midway portions in the axial direction. Lubricating oil is introduced into the bearings through oil passages formed inside the upper housing 11 and the lower housing 12 and groove grooves formed respectively on the inner peripheral surface of the bearing. In addition, two unbalance masses 14L and 14L are integrally provided in the axially middle portion of the drive shaft 13L. The drive shaft 13L is supported while its axial movement is restricted in such a manner that the thrust receiving portion is sandwiched between the thrust portions 17L and 17L.

  The driven shaft 13R is also rotatably supported by a bearing having the same structure as the drive shaft 13L. Since the engine E in this embodiment is a four-cylinder engine, the driven shaft 13R and the drive shaft 13L are set to rotate twice when the crankshaft rotates once. Thus, the balancer device 10 is configured to reduce the secondary vibration generated from the crankshaft by rotating the driven shaft 13R and the drive shaft 13L, which are balancer shafts, in response to the rotation of the crankshaft of the engine E. . In the case where the engine E is a three-cylinder engine, a balancer shaft in the balancer device may be arranged at the center of the crankshaft as one. In this case, the balancer shaft is set to rotate once when the crankshaft rotates once, and the two unbalanced masses are arranged in opposite phases.

  Further, in the balancer device 10 according to the present embodiment, the fastening portion 29 in the oil pump unit 20 is fastened to the fastening portion 30 in the upper housing 11 by a plurality of bolts 30. As a result, the oil pump unit 20 is assembled to the front side of the lower housing 12 on the lower side of the upper housing 11. The oil pump unit 20 is disposed in an oil pump housing 21, a cover 21 a of the oil pump housing 21, an oil pump 23, an oil strainer 24, a pump oil passage 22 formed in the oil pump housing 21, and the pump oil passage 22. Integrated relief valve.

  The oil pump 23 is a trochoid pump including an inner rotor 23a and an outer rotor 23b. An input shaft 26 extending forward from the oil pump housing 21 and an output shaft 25 extending rearward are disposed from the oil pump 23, and the input shaft 26, the oil pump 23, and the output shaft 25 can rotate integrally. It is configured. The input shaft 26 and the output shaft 25 are rotatably supported by two bearings (not shown). The pump oil passage 22 is formed from the oil strainer 24 via the oil pump 23. An oil passage 21b formed on the rear surface of the oil pump cover 21a communicates with the oil pump 23.

  A sprocket 27 is disposed at the front end of the input shaft 26, and a chain C is wound around the sprocket 27 together with a sprocket disposed on a crankshaft (not shown) of the engine E. That is, the rotational drive force from the crankshaft is transmitted to the input shaft 26 by being connected to the crankshaft via the chain C. Since the engine E in the present embodiment is a four-cylinder engine, it is necessary to rotate the driven shaft 13R and the drive shaft 13L twice when the crankshaft makes one rotation. Therefore, the input shaft 26 and the output shaft 25 also rotate the crankshaft once. Then, it is configured to rotate twice.

As will be described later, the rear end portion 25a of the output shaft 25 is connected to the front end portion 13a of the drive shaft 13L so as not to be relatively rotatable. Specifically, as shown in FIGS. 4 and 5, the rear end portion 25a of the output shaft 25 is formed with a two-sided width shape 25b that is eccentric from the axis a2. Further, a groove shape 13b is formed in the front end portion 13a of the drive shaft 13L so as to be eccentric from the axis a1 and accommodate the two-sided width shape 25b. Then, as indicated by an arrow A in FIGS. 5 (a1) and 5 (a2), the two-sided width shape 25b is inserted into the groove shape 13b, so that the drive shaft 13L and the output shaft 25 rotate between each. They are connected so that there is no difference between them. When the drive shaft 13L is connected to the output shaft 25, the axes a1 and a2 coincide with each other as shown in FIG.
The purpose of decentering the two-sided width shape 25b of the output shaft 25 and the groove shape 13b of the drive shaft 13L from the shaft center is to prevent a 180 ° phase shift when assembling them. It is to do.

  As described above, the rotational driving force from the crankshaft is transmitted to the drive shaft 13L via the input shaft 26 and the output shaft 25 of the oil pump 23. When the engine E is a three-cylinder engine, the crankshaft and the input shaft 26 of the oil pump 23 are connected via another gear so that the rotation direction of the balancer shaft is opposite to the rotation direction of the crankshaft. Connected.

  In the balancer device 10 according to the present embodiment, the drive shaft 13L and the output shaft 25 of the oil pump 23 can be easily and correctly connected by being configured as described above. Specifically, by forming the two-sided width shape 25b and the groove shape 13b eccentrically from the shaft centers a2 and a1, it is impossible to connect the drive shaft 13L and the output shaft 25 when the phases are different. It is. That is, only when the phases of the drive shaft 13L and the output shaft 25 match, the two-sided width shape 25b can be connected by being inserted into the groove shape 13b. In the present embodiment, the dihedral width shape 25b is formed on the output shaft 25 and the groove shape 13b is formed on the drive shaft 13L. However, it is also possible to reverse this.

  When the oil pump unit 20 is assembled to the balancer device 10, the oil pump unit 20 is lowered from above the upper housing 11 disposed upside down as indicated by an arrow D1 in FIG. At this time, the upper housing 11 and the oil pump housing 21 are positioned in the front-rear direction by positioning pins (not shown). After the oil pump unit 20 is assembled to the upper housing 11, as shown by an arrow D2 in FIG. 4, the lower housing 12 is lowered from above and the lower housing 12 is fixed to the upper housing 11. As a result, the oil pump unit 20 is assembled to the upper housing 11 and the lower housing 12.

  In the balancer device 10 according to the present embodiment, as described above, the oil pump housing 21, the oil pump 23, the oil strainer 24, the pump oil passage 22, and the relief valve disposed in the pump oil passage 22 are integrated. The oil pump unit 20 is assembled to the upper housing 11 and the lower housing 12. For this reason, even if the oil pump unit 20 is removed from the balancer device 10, the oil pump unit 20 has all the components for evaluating the function of the oil pump 23 (the pump oil passage 22 and the like are formed in the oil pump housing 21. Therefore, the function evaluation of the oil pump unit 20 and the function evaluation of the balancer device 10 before the oil pump unit 20 is assembled can be performed independently.

  Further, in the balancer device 10 according to the present embodiment, the pump oil passage 22 formed in the oil pump housing 21 is fed through the pump discharge oil passage 11 a formed in the front left end portion of the upper housing 11. . The oil that lubricates the oil pump 23 passes through the filter of the engine E and is returned to the oil pump 23 via the filter filtration oil passage 11b formed at the front right end of the upper housing 11. This makes it possible to use oil from which foreign matter has been removed by a filter as oil for lubricating the oil pump 23. In particular, in this embodiment, when the crankshaft rotates once, the input shaft 26 and the output shaft 25 rotate twice, that is, the number of rotations in the oil pump 23 increases. Therefore, the above-described configuration that prevents seizure in the oil pump 23 is suitable. Moreover, according to this structure, since the rotation speed of the oil pump 23 is twice that of the crankshaft, the capacity of the oil pump 23 can be reduced.

10 Balancer Device 11 Upper Housing 12 Lower Housing 13 Balancer Shaft (Drive Shaft, Driven Shaft)
20 Oil pump unit 21 Oil pump housing 22 Pump oil passage (with relief valve)
23 Oil pump 24 Oil strainer 25 Output shaft

Claims (4)

An upper housing fixed to the lower part of the engine;
A lower housing fixed to the lower side of the upper housing and formed shorter in one longitudinal direction than the upper housing;
At least one balancer shaft that is supported between the upper housing and the lower housing and receives rotational force from the one direction;
An balancer device for an engine comprising: an unbalanced mass that rotates integrally with the balancer shaft;
An oil pump housing, an oil pump, an oil strainer, a pump oil passage formed in the oil pump housing, and a pump oil passage are disposed on the one-way side of the lower housing below the upper housing. An oil pump unit integrally including a relief valve is assembled to the upper housing and the lower housing,
An input shaft of the oil pump is connected to a crankshaft of the engine, and an output shaft of the oil pump and the balancer shaft are connected so as not to cause a difference in rotational speed between them. An engine balancer. The balancer shaft and the output shaft of the oil pump are formed in a two-sided width shape in which one is eccentric from the axis, and the other is in a groove shape that is eccentric from the axis and accommodates the two-sided width shape. Forming,
The balancer device for an engine according to claim 1, wherein the balancer shaft is connected to an output shaft from the oil pump by inserting the two-surface width shape into the groove shape. The pump oil passage formed in the oil pump housing is communicated with a balance shaft oil passage formed in the upper housing,
3. The engine according to claim 1, wherein oil that lubricates the oil pump passes through the filter of the engine and flows to the oil pump through the balance shaft oil passage. 4. Balancer device.   4. The engine balancer device according to claim 1, wherein when the crankshaft rotates once, the input shaft and the output shaft of the oil pump rotate twice. 5.

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