JP2016089657A - Chain mechanism for four-cylinder engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chain mechanism for an engine, capable of reducing the influences of a fluctuation in the revolution of the four-cylinder engine, such as vibration and noise resulting from backlash between gears.SOLUTION: The chain mechanism includes a sprocket 7 arranged on a crankshaft 6 of an engine 1, a sprocket 27 arranged on an input shaft 26 of an oil pump 23, a chain 30 wound between the sprocket 7 and the sprocket 27, and a chain tensioner 8 for adjusting the tension of the chain 30. The sprocket 7 is formed so that the sprocket number thereof is twice that of the sprocket 27, the chain 30 has an even-number of link members 31, 31 connected to one another via pins 32, 32, and the ratio of intervals between the adjacent pins 32, 32 is continuously set to be 20:21.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a technology for a chain mechanism of a four-cylinder engine.

  Conventionally, a technique related to a chain mechanism used in a four-cylinder engine is known (see, for example, Patent Document 1 and Patent Document 2). In these four-cylinder engines, it has been required to reduce the influence (for example, vibration and noise caused by backlash between gears) due to the rotational fluctuation.

JP 2006-132780 A JP 2009-103231 A

  The present invention provides a chain mechanism for a four-cylinder engine that can reduce the effects of fluctuations in the rotation of the four-cylinder engine, such as vibration and noise caused by backlash between gears. .

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

  That is, in claim 1, a drive sprocket disposed on a crankshaft of a four-cylinder engine having a displacement of 2L or more and less than 2.4L, a driven sprocket disposed on an input shaft of an oil pump, and the drive A chain mechanism comprising an endless chain wound around a sprocket and the driven sprocket, and a chain tensioner for adjusting the tension of the endless chain, wherein the drive sprocket has twice as many sprockets as the driven sprocket The endless chain is configured by connecting an even number of link members with pins, and is configured such that the ratio of the spacing between adjacent pins is continuous at 20:21. is there.

  In Claim 2, the drive sprocket arrange | positioned at the crankshaft of the 4-cylinder engine whose displacement is 2L or more and less than 2.4L, the driven sprocket arrange | positioned at the input shaft of the oil pump, The drive sprocket, A chain mechanism of a four-cylinder engine, comprising: an endless chain wound around the driven sprocket; and a chain tensioner for adjusting the tension of the endless chain, wherein the four-cylinder engine is a lower part of the four-cylinder engine. An upper housing fixed to the lower housing, a lower housing fixed to a lower side of the upper housing and formed shorter in one longitudinal direction than the upper housing, and a bearing between the upper housing and the lower housing. , At least one balance shaft to which rotational force is input from the one direction; A balancer device for a four-cylinder engine having an unbalanced mass that rotates integrally with the balance shaft, and the oil pump, oil is provided on one side of the lower housing below the upper housing. An oil pump unit integrally including a pump housing, an oil strainer, a pump oil passage formed in the oil pump housing, and a relief valve disposed in the pump oil passage is assembled to the upper housing and the lower housing. The output shaft of the oil pump is connected to the balance shaft by coupling means, the drive sprocket is formed to double the number of sprockets relative to the driven sprocket, and the endless chain is an even number When link members are connected with pins The ratio of the pin adjacent interval is intended to be configured for continuous 20:21.

  In Claim 3, the drive sprocket arrange | positioned at the crankshaft of the 4-cylinder engine whose displacement is 2.4L or more, the driven sprocket arrange | positioned at the input shaft of the oil pump, the drive sprocket, and the driven sprocket A chain mechanism including an endless chain wound around and a chain tensioner for adjusting the tension of the endless chain, wherein the drive sprocket is formed so that the number of sprockets is double that of the driven sprocket. The endless chain is configured by connecting an even number of link members with pins, and is configured such that the ratio of the spacing between adjacent pins is continuous at 20:22.

  The drive sprocket disposed on the crankshaft of a four-cylinder engine having a displacement of 2.4L or more, the driven sprocket disposed on the input shaft of the oil pump, the drive sprocket, and the driven sprocket. A chain mechanism of a four-cylinder engine comprising an endless chain wound around the chain and a chain tensioner for adjusting the tension of the endless chain, wherein the four-cylinder engine is fixed to a lower portion of the four-cylinder engine. An upper housing, a lower housing fixed to a lower side of the upper housing and formed to be shorter in one longitudinal direction than the upper housing, and a bearing between the upper housing and the lower housing, At least one balance shaft to which rotational force is input from the direction, and the balance A balancer device for a four-cylinder engine including an unbalanced mass that rotates integrally with the shaft, and the oil pump and the oil pump housing are disposed on the one side of the lower housing below the upper housing. An oil pump unit integrally including an oil strainer, a pump oil passage formed in the oil pump housing, and a relief valve disposed in the pump oil passage, is assembled to the upper housing and the lower housing, The output shaft of the oil pump is connected to the balance shaft by coupling means, the drive sprocket is formed so that the number of sprockets is double that of the driven sprocket, and the endless chain is an even number of link members Are connected by pins and The ratio of the pin interval is intended to be configured for continuous 20:22.

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

  In other words, the chain mechanism can reduce the effects of fluctuations in the rotation of the four-cylinder engine, such as vibration and noise caused by backlash between sprockets.

1 is a side view showing a four-cylinder engine according to an embodiment of the present invention. XX sectional drawing in FIG. The front view which shows a chain mechanism.

Next, embodiments of the invention will be described. First, the configuration of an engine 1 equipped with a chain mechanism according to an embodiment of the present invention will be described with reference to FIG. In this specification, the direction in the engine 1 is defined by the direction of the arrow shown in each drawing.

  As shown in FIG. 1, the engine 1 is a four-cylinder engine having a balancer device 10 at a lower portion thereof (specifically, a lower surface of a cylinder block in the engine 1). The balancer device 10 is fixed to the upper housing 11 with a plurality of bolts (not shown) and fastening portions 18, 18... Fixed to the engine 1 via a plurality of bolts 19, 19. A lower housing 12. Between the upper housing 11 and the lower housing 12, a pair of balance shafts, 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. Further, unbalance masses 14L and 14R that rotate synchronously or reversely with the balance shafts 13L and 13R are assembled to the balance shafts 13L and 13R, respectively. 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 balance shafts 13L and 13R. As the engine 1 in the present embodiment, a low output engine having a displacement of 2L or more and less than 2.4L is used.

  As shown in FIGS. 1 and 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 1 (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 1. Fixed to.

  As shown in FIG. 1, 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 from the crankshaft 6 of the engine 1 to the output shaft 25 of the oil pump 23. The rotational driving force from the crankshaft 6 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.

  The rear end portion 25a of the output shaft 25 is connected to the front end portion 13a of the drive shaft 13L by a coupling means (Oldham coupling in the present embodiment) so as not to be relatively rotatable. Specifically, as shown in FIG. 2, the rear end portion 25a of the output shaft 25 is formed with a two-sided width shape 25b that is a convex portion decentered from the axis. Further, a groove shape 13b is formed in the front end portion 13a of the drive shaft 13L. And the drive shaft 13L is connected with the output shaft 25 so that relative rotation is impossible by inserting the double face width shape 25b into the groove shape 13b.

  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 1 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 6 rotates once. In this way, the balancer device 10 is configured to reduce the secondary vibration generated from the crankshaft 6 by rotating the driven shaft 13R and the drive shaft 13L, which are balance shafts, in response to the rotation of the crankshaft 6 of the engine 1. It is said. When the engine 1 is a three-cylinder engine, it is possible to configure the balance shaft in the balancer device as one. In this case, the balance shaft is set to rotate once when the crankshaft 6 rotates once, and the two unbalance 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 (driven sprocket) 27 is disposed at the front end of the input shaft 26, and the sprocket 27 is a chain 30 that is an endless chain together with a sprocket (drive sprocket) 7 disposed on the crankshaft 6 of the engine 1. Is wound. In this embodiment, the sprocket 7 is formed so that the number of sprockets is twice that of the sprocket 27. Further, the chain mechanism according to the present embodiment includes a chain tensioner 8 for adjusting the tension of the chain 30 as shown in FIG. That is, the input shaft 26 is connected to the crankshaft 6 via the chain 30, so that the rotational driving force from the crankshaft 6 is transmitted to the input shaft 26 via the chain 30. Since the engine 1 in this embodiment is a four-cylinder engine, it is necessary to rotate the driven shaft 13R and the drive shaft 13L twice when the crankshaft 6 rotates once. The number of sprockets of the sprocket 7 is doubled to the number of sprockets of the sprocket 27 so that it rotates twice when rotated once. 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.

  As described above, the rotational driving force from the crankshaft 6 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 1 is a three-cylinder engine, the crankshaft 6 and the input shaft 26 of the oil pump 23 have other gears so that the rotation direction of the balance shaft is opposite to the rotation direction of the crankshaft 6. Connected through.

  As shown in FIG. 3, the chain 30 used in the chain mechanism according to the present embodiment is spanned between the sprocket 7 in the crankshaft 6 and the sprocket 27 in the input shaft 26, thereby rotating the crankshaft 6 to the input shaft. 26 is transmitted.

  As shown in FIG. 3, the chain 30 is configured by connecting an even number of link members 31, 31. And the ratio of the space | interval of adjacent pin 32 * 32 ... is comprised so that it may continue by 20:21. Specifically, as shown in FIG. 3, when the distance between the pins 32 and 32 in one link member 31 is a, the distance between the pins 32 and 32 in the link member 31 adjacent to the link member 31 is 1.05a. It is formed. In the chain 30, the intervals 32, 32,... Are formed so that a and 1.05a repeat continuously.

  In the engine chain mechanism according to the present embodiment, it is possible to reduce the influence due to the rotational fluctuation of the engine 1. Specifically, even if rotational fluctuations occur in the engine 1, the ratio of the spacing between adjacent pins 32, 32... In the chain 30 is continuous at 20:21. 30 can absorb. For example, in this embodiment, vibration and noise caused by backlash between the gears between the helical gears 16L and 16R can be reduced. In addition, by configuring as described above, the number of parts can be reduced in the technology (backlash reduction technology between gears, damping steel plate in an oil pan, etc.) used in the engine 1 to reduce the influence of rotational fluctuation, It is also possible to simplify the configuration. Further, by configuring as described above, the output shaft 25 of the oil pump 23 and the drive shaft 13L are connected by Oldham coupling, so that vibration and noise due to the clearance can be reduced and processing costs can be reduced. It can be done.

  The chain mechanism in the present embodiment is used for a low-power engine having a displacement of 2L or more and less than 2.4L. However, the chain mechanism according to the present invention is applied to a high-power engine having a displacement of 2.4L or more. It is also possible. In this case, it is preferable that the ratio of the spacing between adjacent pins 32, 32. Thereby, the influence of rotational fluctuation can be absorbed by the chain 30, and for example, vibration and noise caused by backlash between the gears between the helical gears 16L and 16R can be reduced.

1 Engine 6 Crankshaft 7 Sprocket (Drive Sprocket)
8 Chain tensioner 23 Oil pump 26 Input shaft 27 Sprocket (driven sprocket)
30 chain (endless chain)
31 Link member 32 pin

Claims (4)

A drive sprocket disposed on a crankshaft of a four-cylinder engine having a displacement of 2L or more and less than 2.4L, a driven sprocket disposed on an input shaft of an oil pump,
An endless chain wound around the drive sprocket and the driven sprocket;
A chain tensioner for adjusting the tension of the endless chain, and a chain mechanism comprising:
The drive sprocket is formed so that the number of sprockets is twice that of the driven sprocket,
The endless chain is configured by connecting an even number of link members with pins, and is configured so that the ratio of the spacing between adjacent pins is continuous at 20:21. Engine chain mechanism. A drive sprocket disposed on a crankshaft of a four-cylinder engine having a displacement of 2L or more and less than 2.4L, a driven sprocket disposed on an input shaft of an oil pump,
An endless chain wound around the drive sprocket and the driven sprocket;
A chain tensioner for adjusting the tension of the endless chain, and a chain mechanism of a four-cylinder engine,
The four-cylinder engine includes an upper housing fixed to a lower portion of the four-cylinder 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 balance shaft which is supported between the upper housing and the lower housing and receives rotational force from the one direction;
A balancer device for a four-cylinder engine comprising: an unbalanced mass that rotates integrally with the balance shaft;
The oil pump, the oil pump housing, the oil strainer, the pump oil passage formed in the oil pump housing, and the pump oil passage are disposed on the one direction side of the lower housing below the upper housing. An oil pump unit integrally provided with the relief valve is assembled to the upper housing and the lower housing,
The output shaft of the oil pump is connected to the balance shaft by coupling means,
The drive sprocket is formed so that the number of sprockets is twice that of the driven sprocket,
The endless chain is configured by connecting an even number of link members with pins, and is configured so that the ratio of the spacing between adjacent pins is continuous at 20:21. Engine chain mechanism. A drive sprocket disposed on the crankshaft of a 4-cylinder engine having a displacement of 2.4 L or more, a driven sprocket disposed on the input shaft of the oil pump,
An endless chain wound around the drive sprocket and the driven sprocket;
A chain tensioner for adjusting the tension of the endless chain, and a chain mechanism comprising:
The drive sprocket is formed so that the number of sprockets is twice that of the driven sprocket,
The endless chain is configured by connecting an even number of link members with pins, and is configured so that the ratio of the interval between adjacent pins is continuous at 20:22. Engine chain mechanism. A drive sprocket disposed on the crankshaft of a 4-cylinder engine having a displacement of 2.4 L or more, a driven sprocket disposed on the input shaft of the oil pump,
An endless chain wound around the drive sprocket and the driven sprocket;
A chain tensioner for adjusting the tension of the endless chain, and a chain mechanism of a four-cylinder engine,
The four-cylinder engine includes an upper housing fixed to a lower portion of the four-cylinder 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 balance shaft which is supported between the upper housing and the lower housing and receives rotational force from the one direction;
A balancer device for a four-cylinder engine comprising: an unbalanced mass that rotates integrally with the balance shaft;
The oil pump, the oil pump housing, the oil strainer, the pump oil passage formed in the oil pump housing, and the pump oil passage are disposed on the one direction side of the lower housing below the upper housing. An oil pump unit integrally provided with the relief valve is assembled to the upper housing and the lower housing,
The output shaft of the oil pump is connected to the balance shaft by coupling means,
The drive sprocket is formed so that the number of sprockets is twice that of the driven sprocket,
The endless chain is configured by connecting an even number of link members with pins, and is configured so that the ratio of the interval between adjacent pins is continuous at 20:22. Engine chain mechanism.

Images