JP5351947B2 - Internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an internal combustion engine capable of sharing an internal combustion engine body, while being compatible with both of hydraulic type and electric type valve timing adjusting means. <P>SOLUTION: The internal combustion engine 1 has the hydraulic type or electric type valve timing adjusting means relatively turning a cam shaft 10 to an advanced angle side or a delayed angle side to a timing gear, an attaching hole 3 arranged in the internal combustion engine body 2, an upstream oil channel 30 communicating to the attaching hole 3, and downstream oil channels 41, 42 communicating from the attaching hole 3 to the valve timing adjusting means, and further has a switching valve capable of switching a communicating state of the upstream oil channel 30 and either one of downstream oil channels 41, 42 when the hydraulic type valve timing adjusting means is arranged, and a communication member 70 fixing the communicating state of the upstream oil channel 30 and either one of the downstream oil channels 41, 42 when the electric type valve timing adjusting means 60 is arranged. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to an internal combustion engine having valve timing adjusting means for adjusting opening and closing timings of an intake valve and an exhaust valve.

  As an internal combustion engine that adjusts the opening / closing timing of the intake valve and the exhaust valve according to the driving state, a hydraulic valve timing adjusting means that relatively rotates the camshaft to the advance side or the retard side with respect to the timing gear; A mounting hole formed in the main body of the internal combustion engine, an upstream oil passage leading to the mounting hole, and a downstream oil passage on the advance side and the retard side leading to the valve timing adjusting means from the mounting hole, and the upstream oil passage; There is a type in which a switching valve capable of switching the state of communication with the advance side or the retarded side downstream oil passage is provided in the mounting hole (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 10-184323

  In the above-described conventional internal combustion engine, when an electric valve timing adjusting means is provided instead of the hydraulic valve timing adjusting means, an oil passage for supplying lubricating oil to the electric valve timing adjusting means is provided. Since another formed internal combustion engine body is used, there is a problem that the manufacturing cost increases.

  An object of the present invention is to solve the above-described problems and provide an internal combustion engine that can be used for both hydraulic and electric valve timing adjustment means and can share an internal combustion engine body.

To solve the above problems, the present invention is an internal combustion engine, a hydraulic or electric valve timing adjusting means for relative rotation mosquitoes Mushafuto to the advance side or retard side by relative timing gear, internal combustion An attachment hole formed in the engine body, an upstream oil passage that communicates with the attachment hole, and a plurality of downstream oil passages that communicate with the valve timing adjusting means from the attachment hole.
When the hydraulic valve timing adjusting means is provided, a switching valve capable of switching the communication state between the upstream oil passage and any one of the downstream oil passages is provided in the mounting hole. .
Further, when the electric valve timing adjusting means is provided, a communication member for fixing a communication state between the upstream oil passage and at least one of the downstream oil passages is provided in the mounting hole.

  In this configuration, since the switching valve or the communication member is provided in the mounting hole in accordance with the hydraulic or electric valve timing adjusting means, it is possible to cope with both the hydraulic and electric valve timing adjusting means. The internal combustion engine main body can be shared.

Usually, the switching valve described above is provided with a filter for filtering liquid. Therefore, when the communication member is provided in the mounting hole instead of the switching valve, the filter is also removed together with the switching valve. Therefore, when the electrically operated valve timing adjusting means is provided, the communication member provided in the mounting hole is formed with a communication passage that communicates the upstream oil passage with at least one of the downstream oil passages. In addition, it is preferable to protect the electric valve timing adjusting means from impurities by providing a filter in the communication path.

In the above-described internal combustion engine, each downstream oil passage includes an advance angle side downstream oil passage communicating with an advance angle side hydraulic chamber of the hydraulic valve timing adjusting means, and a delay time of the hydraulic valve timing adjusting means. The downstream oil passage on the retard angle side communicating with the angle side hydraulic chamber, and when the electrically operated valve timing adjusting means is provided, the downstream oil passage on the advance angle side and the retard angle side are electrically operated. In addition, the upstream oil passage and the downstream oil passage on the advance side or the retard side may communicate with each other through the valve timing adjusting means.
In this configuration, the lubricating oil can be supplied to the electric valve timing adjusting means using the oil passage corresponding to the hydraulic valve timing adjusting means.

  In the internal combustion engine, of the downstream oil passages on the advance side and the retard side, the one provided on the valve timing adjusting means side in the axial direction of the camshaft is connected to the upstream oil passage by the communication member. It is preferable to communicate. Moreover, you may make the one where a path | route length is short among the said downstream oil paths of an advance side and a retard angle side communicate with the said upstream oil path by the said communication member.

  In these configurations, it is possible to improve the responsiveness when supplying lubricating oil from the mounting hole to the electric valve timing adjusting means.

  In the internal combustion engine of the present invention, it is possible to cope with both hydraulic and electric valve timing adjusting means, and the internal combustion engine main body can be shared, so that the manufacturing cost can be reduced.

1 is a side sectional view showing an internal combustion engine provided with hydraulic valve timing adjusting means. It is the figure which showed the internal combustion engine which provided the hydraulic valve timing adjustment means, and is AA sectional drawing of FIG. It is an axial sectional view of a hydraulic valve timing adjusting means. 1 is a side sectional view showing an internal combustion engine provided with an electric valve timing adjusting means. FIG. 5 is a view showing an internal combustion engine provided with an electric valve timing adjusting means, and is a cross-sectional view taken along the line BB of FIG. 4.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
An internal combustion engine 1 shown in FIG. 1 has a variable valve timing control system that adjusts the opening and closing timings of an intake valve and an exhaust valve in accordance with a driving state.

In the following description, after describing the internal combustion engine 1 provided with the hydraulic valve timing adjusting means 20, the internal combustion engine 1 provided with the electric valve timing adjusting means 60 (see FIG. 4) will be described.
In the following description, the vertical direction is the vertical direction in the cylinder axis direction.

The internal combustion engine 1 shown in FIG. 1 is a hydraulic valve timing that relatively rotates the camshaft 10 to the advance side or the retard side with respect to the timing gear 4 that rotates in conjunction with a crankshaft (not shown). Adjustment means 20 is provided.
Further, as shown in FIG. 2, the mounting hole 3 formed in the internal combustion engine main body 2, the upstream oil passage 30, the advance side and retard side downstream oil passages 41, 42, and the attachment hole 3 are provided. And a switching valve 50.

  As shown in FIG. 3, the hydraulic valve timing adjusting means 20 is connected to the housing 21 in which the four advance side hydraulic chambers 22 and the retard side hydraulic chamber 23 are formed, and the camshaft 10, and is advanced side. And a rotating blade 24 formed with four wings that divide the hydraulic chamber 22 and the retarded-side hydraulic chamber 23 so that the rotating blade 24 rotates a predetermined angle within the housing 21. It is configured.

In the hydraulic valve timing adjusting means 20, the hydraulic oil is supplied from the advance hydraulic fluid passage 25 to the advance hydraulic chamber 22 and is operated from the retard hydraulic chamber 23 to the retard hydraulic passage 26. Oil is discharged, and the camshaft 10 is rotated to the advance side by rotating the rotating blade 24 to the advance side by the pressure in the advance side hydraulic chamber 22.
Further, the hydraulic oil is supplied from the retarded hydraulic fluid passage 26 to the retarded hydraulic chamber 23 and discharged from the advanced hydraulic chamber 22 to the advanced hydraulic fluid passage 25 so as to be retarded. The camshaft 10 is rotated to the retarded angle side by rotating the rotating blade 24 to the retarded angle side by the pressure in the hydraulic chamber 23.

As shown in FIG. 2, the internal combustion engine body 2 includes a cylinder head 2a, a cam holder 2b attached to the upper surface of the cylinder head 2a, and a cam cap 2c attached to the upper surface of the cam holder 2b. A mating surface between the cylinder head 2a and the cam holder 2b extends in a direction perpendicular to the cylinder axis.
A lower half of the bearing hole 2d is formed on the upper surface of the cam holder 2b, and an upper half of the bearing hole 2d is formed on the lower surface of the cam cap 2c.
On the inner peripheral surface of the bearing hole 2d, cylinder head grooves 2e and 2f on the advance side and the retard side are formed. As shown in FIG. 1, in the axial direction of the bearing hole 2d, the cylinder head groove 2f on the retard side is closer to the hydraulic valve timing adjusting means 20 (internal combustion) than the cylinder head groove 2e on the advance side. It is provided on the outer surface side of the engine body 2.

In the camshaft 10, as shown in FIG. 2, two advanced shaft side oil passages 11 communicating with the advance side hydraulic fluid passage 25 and two retarded side hydraulic fluid passages 26 are communicated. A retarded-side shaft oil passage 12 is formed in the axial direction.
As shown in FIG. 1, one end of the advance side shaft oil passage 11 is open to the bottom surface of the advance side shaft groove 13 formed on the entire outer periphery of the camshaft 10.
In addition, one end of the retarded-side shaft oil passage 12 is open to the bottom surface of the retarded-side shaft groove 14 formed on the entire circumference of the outer peripheral surface of the camshaft 10.
In a state where the camshaft 10 is inserted into the bearing hole 2d, the advance side shaft groove 13 faces the advance side cylinder head groove 2e, and the retard side shaft groove 14 becomes the retard side cylinder head groove 2f. Opposite to.

  As shown in FIG. 2, the mounting hole 3 is a hole having a circular cross section that is opened on the side surface of the cylinder head 2 a.

  The upstream oil passage 30 is an oil passage formed in the cylinder head 2 a and is formed below the mounting hole 3. The lower end portion of the upstream oil passage 30 communicates with a hydraulic pump provided at the lower portion of the internal combustion engine 1. Further, the upper end portion of the upstream oil passage 30 opens at a substantially intermediate position in the axial direction on the inner peripheral surface of the mounting hole 3.

  The advance side and retard side downstream oil passages 41 and 42 are oil passages formed inside the cylinder head 2 a and the cam holder 2 b, and are formed above the mounting hole 3.

  The lower end portion of the downstream oil passage 41 on the advance side is open at a position on the inner side of the mounting hole 3 on the inner side in the axial direction. The advanced downstream side oil passage 41 extends upward from the mounting hole 3 in the cylinder head 2a, bends at a split position between the cylinder head 2a and the cam holder 2b, and toward the bearing hole 2d in the cam holder 2b. It is extended diagonally upward. The upper end portion of the advance side downstream oil passage 41 opens to the bottom surface of the advance side cylinder head groove 2e (see FIG. 1).

  The lower end portion of the retarded-side downstream oil passage 42 opens at a position on the opening side in the axial direction on the inner peripheral surface of the mounting hole 3. The retarded-side downstream oil passage 42 extends obliquely upward from the mounting hole 3 in the cylinder head 2a. Moreover, it bends in the division | segmentation position of the cylinder head 2a and the cam holder 2b, and is extended in the direction orthogonal to a cylinder axis along the mating surface of the cylinder head 2a and the cam holder 2b (section 42a). Further, the retarded-side downstream oil passage 42 bends below the bearing hole 2d and extends upward along the cylinder axis toward the bearing hole 2d in the cam holder 2b (section 42b). The upper end portion of the retarded-side downstream oil passage 42 opens at the bottom surface of the retarded-side cylinder head groove 2f.

  In the present embodiment, the retarded-side cylinder head groove 2f, which is a part of the retarded-side downstream oil passage 42, is more advanced than the advanced-angle-side cylinder head groove 2f. It is provided closer to the hydraulic valve timing adjusting means 20 in the axial direction of the camshaft 10 than 2e.

  The switching valve 50 is an electromagnetic valve controlled by an ECU (Electronic Control Unit) (not shown). The tip of the switching valve 50 is inserted into the mounting hole 3, and the switching valve 50 is fixed to the cylinder head 2a.

  An upstream communication port 51 that communicates with the upstream oil passage 30, an advance-side downstream communication port 52 that communicates with the advance-side downstream oil passage 41, and a retard-side downstream oil passage are provided at the tip of the switching valve 50. A retarded-side downstream communication port 53 that communicates with 42 and a drain communication port 54 that communicates with a drain hole (not shown) are formed.

In the switching valve 50, the communication state between the upstream communication port 51 and the advance side or retard side downstream communication ports 52, 53 can be switched, and the drain communication port 54 and the advance side or retard side downstream communication can be switched. The communication state with the ports 52 and 53 can be switched freely.
That is, in the switching valve 50, the upstream oil passage 30 is communicated with the advance side or retard side downstream oil passages 41, 42, and the advance side or retard side downstream oil passage that is not communicated with the upstream oil passage 30. 41 and 42 can be communicated with a drain hole (not shown), and the communication state can be switched.

  In the internal combustion engine 1 shown in FIG. 1, when the camshaft 10 is rotated relative to the timing gear 4 toward the advance side, as shown in FIG. 2, as shown in FIG. The downstream communication port 52 on the side and the downstream communication port 53 on the retard side and the drain communication port 54 are connected.

  Accordingly, the upstream oil passage 30 communicates with the advance downstream oil passage 41, and the retard downstream oil passage 42 communicates with a drain hole (not shown). Then, the hydraulic oil supplied from the hydraulic pump (not shown) to the upstream oil passage 30 flows into the shaft oil passage 11 through the advanced downstream oil passage 41, the cylinder head groove 2 e (see FIG. 1), and the shaft groove 13.

As shown in FIG. 3, the hydraulic oil flows from the advance side shaft oil passage 11 into the advance side hydraulic chamber 22 through the hydraulic oil passage 25. As a result, the pressure in the advance side hydraulic chamber 22 is increased, and the blade portion of the rotary blade 24 is pushed toward the advance side, whereby the rotary blade 24 rotates toward the advance side.
Further, the hydraulic oil in the retarded-side hydraulic chamber 23 is discharged to the shaft oil passage 12 through the retarded-side hydraulic oil passage 26. Further, the hydraulic oil flows into a drain hole (not shown) through the retarded-side shaft groove 14, the cylinder head groove 2 f and the downstream oil passage 42 shown in FIG. 2, and is returned to the hydraulic pump side.

  In the internal combustion engine 1 shown in FIG. 1, when the camshaft 10 is rotated relative to the timing gear 4 toward the retard side, as shown in FIG. 2, the upstream communication port 51 and the retard angle of the switching valve 50 are retarded. The downstream communication port 53 on the side and the downstream communication port 52 on the advance side and the drain communication port 54 are connected.

  Thus, the upstream oil passage 30 communicates with the retarded downstream oil passage 42, and the advance downstream oil passage 41 communicates with a drain hole (not shown). The hydraulic oil supplied from the hydraulic pump (not shown) to the upstream oil passage 30 flows into the shaft oil passage 12 through the retarded-side downstream oil passage 42, the cylinder head groove 2 f and the shaft groove 14.

As shown in FIG. 3, the hydraulic oil flows from the retarded-side shaft oil passage 12 into the retarded-side hydraulic chamber 23 through the hydraulic oil passage 26. As a result, the pressure in the retarded-side hydraulic chamber 23 increases, and the blade portion of the rotating blade 24 is pushed toward the retarded side, so that the rotating blade 24 rotates toward the retarded side.
Further, the hydraulic oil in the advance side hydraulic chamber 22 is discharged to the shaft oil passage 11 through the advance side hydraulic oil passage 25. Further, the hydraulic oil flows into the drain hole (not shown) through the advance side shaft groove 13 and the cylinder head groove 2e shown in FIG. 1 and the downstream oil passage 41 shown in FIG. 2, and is returned to the hydraulic pump side.

  Next, a configuration in which an electric valve timing adjusting means 60 shown in FIG. 4 is provided in place of the hydraulic valve timing adjusting means 20 of the internal combustion engine 1 shown in FIG. 1 will be described. In the internal combustion engine 1 of the present embodiment, the hydraulic valve timing adjusting means 20 (see FIG. 1) or the electric valve timing adjusting means 60 can be selectively attached to the end of the camshaft 10.

As shown in FIG. 4, the electric valve timing adjusting means 60 includes a motor 61 having an output shaft 61a, and a phase conversion mechanism 62 having a rotating member connected to the output shaft 61a and the camshaft 10. I have.
In the motor 61, the rotation of the output shaft 61a is controlled by an ECU (not shown). Then, by rotating the output shaft 61a to the advance side or the retard side, the camshaft 10 can be relatively rotated to the advance side or the retard side with respect to the timing gear 4.

  In the internal combustion engine 1 provided with the electric valve timing adjusting means 60, a communication member 70 is provided in the mounting hole 3 as shown in FIG. 5. The communicating member 70 has a tip inserted into the mounting hole 3 and is fixed to the cylinder head 2a.

A communication passage 71 that connects the upstream oil passage 30 and the retarded-side downstream oil passage 42 is formed at the tip of the communication member 70.
In the communication member 70, the communication state between the upstream oil passage 30 and the retarded downstream oil passage 42 is fixed. That is, the communication member 70 is a member that cannot switch the communication state between the upstream oil passage 30 and the downstream oil passages 41 and 42 on the advance side or the retard side.
A filter 72 for filtering the lubricating oil is accommodated in the communication path 71. Further, in the communication path 71, the downstream portion of the portion where the filter 72 is accommodated is reduced in diameter, and an orifice 73 is formed.

  In the internal combustion engine 1 shown in FIG. 5, when the lubricating oil is supplied to the upstream oil passage 30, the lubricating oil passes through the communication passage 71 of the communication member 70, and the retarded-side downstream oil passage 42, the cylinder head groove 2 f, The electric valve timing adjusting means 60 (see FIG. 4) is supplied through the shaft groove 14.

  At this time, the lubricating oil passes through the orifice 73 of the communication passage 71 so that the amount of lubricating oil necessary for the lubrication of the electric valve timing adjusting means 60 flows into the downstream oil passage 42 on the retard side. It is configured. Moreover, it can prevent that the hydraulic pressure of the upstream oil path 30 falls because lubricating oil passes the orifice 73. FIG.

In the internal combustion engine 1 as described above, as shown in FIGS. 2 and 5, the switching valve 50 or the communication member according to the hydraulic or electric valve timing adjusting means 20, 60 (see FIGS. 1 and 4). By providing 70 in the mounting hole 3, both the hydraulic and electric valve timing adjusting means 20, 60 can be accommodated, and the internal combustion engine body 2 can be shared, thus reducing the manufacturing cost. be able to.
In the present embodiment, the lubricating oil is supplied to the electric valve timing adjusting means 60 shown in FIG. 4 using an oil passage corresponding to the hydraulic valve timing adjusting means 20 shown in FIG.

  Further, as shown in FIG. 5, in the axial direction of the camshaft 10, the downstream side on the retard side provided on the electric valve timing adjusting means 60 (see FIG. 4) side from the downstream oil passage 41 on the advance side. By connecting the oil passage 42 to the upstream oil passage 30 by the communication member 70, the responsiveness when supplying the lubricating oil from the mounting hole 3 to the electric valve timing adjusting means 60 can be enhanced.

When the internal combustion engine 1 of the present embodiment is mounted on a vehicle, the internal combustion engine body 2 is usually inclined such that the upper side in the cylinder axial direction is disposed on the left side in FIG. 5 with respect to the lower side. When the internal combustion engine body 2 is installed in this way, when the internal combustion engine 1 is stopped, the lubricating oil in the downstream oil passage 41 on the advance side flows down due to gravity.
Further, the retarded-side downstream oil passage 42 is extended to the opposite side of the inclination direction of the internal combustion engine body 2 with the axial center position of the camshaft 10 as the center. A section 42a perpendicular to the cylinder axis formed on the mating surface of the cylinder head 2a and the cam holder 2b and a section 42b along the cylinder axis formed in the cam holder 2b form a V-shaped bent portion 42c. Since the lubricating oil is formed and accumulated in the bent portion 42c, the internal combustion engine 1 can be started quickly.

  Further, normally, the switching valve 50 shown in FIG. 2 is provided with a filter for filtering the hydraulic oil. Therefore, when the communication member 70 shown in FIG. 5 is provided in the mounting hole 3 instead of the switching valve 50, the filter is also removed together with the switching valve 50. In the communication member 70 of the present embodiment, since the filter 72 is provided in the communication path 71, the electric valve timing adjusting means 60 can be protected from impurities.

The embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention.
For example, in this embodiment, as shown in FIG. 5, in the axial direction of the camshaft 10, it is provided closer to the electric valve timing adjustment means 60 (see FIG. 4) than the downstream oil passage 41 on the advance side. Although the retarded-side downstream oil passage 42 communicates with the upstream oil passage 30, the advanced-angle-side downstream oil passage 41 may communicate with the upstream oil passage 30. Furthermore, both the advance side and retard side downstream oil passages 41 and 42 may be communicated with the upstream oil passage 30.

  In addition, by connecting one of the downstream oil passages 41 and 42 on the advance side and the retard side on the short side with the upstream oil passage 30 by the communication member 70, the electric valve timing is adjusted from the mounting hole 3. You may improve the responsiveness when supplying lubricating oil to the means 60 (refer FIG. 4).

  Further, a filter may be provided in another part of the oil passage without providing the filter 72 in the communication passage 71 of the communication member 70.

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Internal combustion engine main body 2a Cylinder head 2b Cam holder 2c Cam cap 2d Bearing hole 3 Mounting hole 4 Timing gear 10 Camshaft 11 Advance side shaft oil path 12 Delay angle side shaft oil path 20 Hydraulic valve timing adjustment Means 22 Advance angle side hydraulic chamber 23 Delay angle side hydraulic chamber 24 Rotary blade 30 Upstream oil passage 41 Advance angle side downstream oil passage 42 Delay angle side downstream oil passage 50 Switching valve 51 Upstream communication port 52 Advance angle side downstream Communication port 53 Delayed downstream communication port 54 Drain communication port 60 Electric valve timing adjusting means 61 Motor 61a Output shaft 62 Phase conversion mechanism unit 70 Communication member 71 Communication channel 72 Filter

Claims (5)

A hydraulic or electric valve timing adjusting means for relative rotation mosquitoes Mushafuto to the advance side or retard side by relative timing gear,
Mounting holes formed in the internal combustion engine body;
An upstream oil passage leading to the mounting hole;
A plurality of downstream oil passages communicating with the valve timing adjusting means from the mounting hole,
When the hydraulic valve timing adjusting means is provided, a switching valve capable of switching the communication state between the upstream oil passage and any one of the downstream oil passages is provided in the mounting hole,
When the electrically operated valve timing adjusting means is provided, a communication member that fixes a communication state between the upstream oil passage and at least one of the downstream oil passages is provided in the mounting hole. An internal combustion engine. When the electric valve timing adjusting means is provided, the communication member provided in the mounting hole includes:
A communication passage is formed for communicating the upstream oil passage with at least one of the downstream oil passages;
The front Killen passage, an internal combustion engine according to claim 1, characterized in that the filter is provided. Each of the downstream oil passages communicates with the advance-side downstream oil passage communicating with the advance-side hydraulic chamber of the hydraulic valve timing adjusting means and the retard-side hydraulic chamber of the hydraulic valve timing adjusting means. The downstream oil passage on the retarded angle side,
When the electric valve timing adjusting means is provided,
The downstream oil passage on the advance side and the retard side leads to the electric valve timing adjusting means,
3. The internal combustion engine according to claim 1, wherein the upstream oil passage and the downstream oil passage on the advance side or the retard side communicate with each other by the communication member.   Of the downstream oil passages on the advance side and the retard side, the one provided on the valve timing adjusting means side in the axial direction of the camshaft communicates with the upstream oil passage by the communication member. The internal combustion engine according to claim 3.   4. The internal combustion engine according to claim 3, wherein, of the downstream oil passages on the advance side and the retard side, the one with the shorter path length communicates with the upstream oil passage by the communication member.

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