JP2008121558A - Valve timing adjusting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve timing adjusting device miniaturized in an axial direction. <P>SOLUTION: A vane rotor 14 includes a rotor side advancing oil passage 64 establishing communication between an advancing chamber and a cam side advancing oil passage 72 formed on a camshaft 2, and a rotor side retarding oil passage 68 establishing communication between a retarding chamber and a cam side retarding oil passage 73 formed on the camshaft. The rotor side advancing oil passage 64 out of both oil passages 64, 68 is formed in a hole shape passing through an inside of a vane rotor 14 and the rotor side retarding oil passage 68 out of both oil passages 64, 68 is positioned at a section keeping surface contact with an axial end surface 2a of the camshaft 2 of the vane rotor 14 and is formed in a groove shape opening toward the axial end surface 2a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a valve timing adjusting device for an internal combustion engine that adjusts the opening / closing timing of at least one of an intake valve and an exhaust valve (hereinafter, the opening / closing timing is referred to as a valve timing).

  2. Description of the Related Art Conventionally, a valve timing adjusting device that adjusts the valve timing of an intake valve or an exhaust valve by forming a phase difference between a vane rotor and a housing by hydraulic oil pressure is known (see Patent Documents 1 and 2). This valve timing adjusting device has an advance angle chamber and a retard angle chamber between a relative rotating vane rotor and a housing. The switching valve switches between a state in which the hydraulic oil from the oil pump is supplied to the advance passage that communicates with the advance chamber, and a state that the hydraulic oil is supplied to the retard passage that communicates with the retard chamber. And control the oil pressure in the retard chamber. By controlling the hydraulic pressure, the vane rotor and the housing are relatively rotated, and a phase difference is formed between them to adjust the valve timing.

FIG. 8 is a cross-sectional view showing a valve timing adjusting device having a structure similar to the devices described in Patent Documents 1 and 2, and the driving force of the internal combustion engine is transmitted to the sprocket 110 constituting the housing 180 and then the vane rotor 140. Is transmitted to the camshaft 200 coupled to the.
A cam side advance oil passage 720 and a cam side retard oil passage 730 are formed inside the camshaft 200 so as to penetrate in the axial direction. The cam side advance oil passage 720 communicates with a groove-shaped oil passage 111 formed in the sprocket 110, and the oil passage 111 communicates with an advance chamber. On the other hand, the cam-side retarded oil passage 730 communicates with a through-hole-shaped oil passage 141 formed inside the vane rotor 140, and the oil passage 141 communicates with the retard chamber.

  Accordingly, a supply path (hereinafter referred to as an advance path) of hydraulic oil discharged from a hydraulic pump (not shown) is a cam side advance oil path 720 and an oil path 111 of the sprocket 110 (housing 180). The supply path to the retard chamber (hereinafter referred to as the retard path) is the cam-side retard oil path 730 and the oil path 141 of the vane rotor 140.

JP-A-5-99006 JP 2000-227014 A

However, in the conventional structure shown in FIG. 8 above, the oil passage 141 of the retarding path is formed in the vane rotor 140 with respect to the downstream side portion of the camshaft 200 in the supply path of hydraulic oil, but the oil path of the advancement path is formed. Since 111 is formed in the housing 180, the housing 180 becomes thicker in the axial direction, and the valve timing adjusting device becomes larger in the axial direction.
To solve this problem, the vane rotor 140 is thickened in the axial direction simply by forming both the retarded path oil path 141 and the advanced path oil path 111 in the shape of the penetrating holes in the vane rotor 140. Therefore, the above-described enlargement cannot be sufficiently suppressed.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a valve timing adjusting device that is miniaturized in the axial direction.

  According to the first aspect of the present invention, the vane rotor includes a rotor side advance oil passage that communicates the cam side advance oil passage formed in the camshaft and the advance chamber, and a cam side retard formed in the camshaft. A rotor-side retarded oil passage that communicates the corner oil passage with the retarded chamber; One of the rotor-side advance oil passage and the rotor-side retard oil passage is formed in a hole shape penetrating the inside of the vane rotor, and the rotor-side advance oil passage and the rotor-side retard oil passage The other oil passage is located in a portion of the vane rotor that is in surface contact with the axial end surface of the camshaft, and is formed in a groove shape that opens toward the axial end surface.

According to this, regarding the downstream portion of the camshaft in the hydraulic oil supply path, both the rotor side advance oil path and the rotor side retard oil path are formed in the vane rotor. And the other oil path is formed in the groove shape opened toward an axial direction end surface among a rotor side advance angle oil path and a rotor side retard angle oil path.
Therefore, the housing can be reduced in the axial direction while minimizing the increase in the size of the vane rotor in the axial direction as compared with the conventional structure shown in FIG. Therefore, the valve timing adjusting device can be downsized in the axial direction.

According to the second aspect of the present invention, the camshaft has a lubricating oil passage for supplying lubricating oil to the sliding clearance between the outer peripheral surface of the camshaft and the inner peripheral surface of the housing, and the lubricating oil passage is on the cam side. This is an oil passage branched from an advance oil passage or a cam-side retard oil passage.
According to this, since the lubricating oil passage is constituted by branching from the cam side advance oil passage or the cam side retardation oil passage, a dedicated lubricating oil is provided separately from the cam side advance oil passage and the cam side retardation oil passage. The oil passage structure inside the camshaft can be simplified as compared with the case having a passage.

By the way, when the other oil passage is formed in a groove shape as described in claim 1, the hydraulic oil in the other oil passage leaks into the fitting clearance between the camshaft and the vane rotor or the sliding clearance between the vane rotor and the housing. It is inevitable. When the lubricating oil passage is branched from the cam side advance oil passage or the cam side retard oil passage as described in claim 2, as illustrated in FIGS. 4 (a) and 4 (b) and FIG. The lubricating oil passage and the other oil passage communicate with each other due to the leaked hydraulic oil.
Then, when the lubricating oil passage is branched from the oil passage communicating with one of the oil passages formed in the hole shape among the cam side advance oil passage and the cam side retard oil passage (FIG. 4A and FIG. 5), since the lubricating oil passage and the other oil passage communicate with each other as described above, the one oil passage and the other oil passage communicate with each other via the clearance and the lubricating oil passage. Therefore, when controlling the hydraulic pressure in the advance chamber and the retard chamber, the accuracy is deteriorated, and it is difficult to accurately control the relative rotational position of the vane rotor.

  With respect to this problem, according to the third aspect of the present invention, as illustrated in FIG. 4B and FIG. 6, the lubricating oil passage is one of the cam side advance oil passage and the cam side retard oil passage. , Branch off from the oil passage communicating with the other oil passage formed in the groove shape. Therefore, although the lubricating oil passage communicates with the other oil passage, the one oil passage and the other oil passage do not communicate with each other, and the working oil in the lubricating oil passage and the working oil in the other oil passage Becomes the same pressure. Therefore, in controlling the hydraulic pressure in the advance chamber and the retard chamber, it is possible to avoid deterioration of the accuracy of the hydraulic pressure.

  According to the fourth aspect of the present invention, the vane rotor is formed by sintering, and the other oil passage formed in the groove shape is formed by a mold for sintering. Therefore, in forming the other oil passage into a groove shape, the manufacturing cost can be reduced as compared with the case where it is formed by cutting with an end mill or laser processing.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In the following embodiments shown in FIGS. 1 to 8, the same or equivalent parts are denoted by the same reference numerals in the drawings.
(First embodiment)
An example in which the valve timing adjusting device 1 according to the first embodiment of the present invention is applied to an exhaust valve of an internal combustion engine of a vehicle is shown in FIGS. First, a schematic structure of the valve timing adjusting device 1 will be described with reference to FIG. 1 which is a sectional view of the valve timing adjusting device 1 and FIG. 2 which is a II-II sectional view of FIG. In FIG. 2, hatching indicating a cross section of the member is omitted.

  The valve timing adjusting device 1 is a hydraulic control type that uses hydraulic oil as hydraulic oil. The valve timing adjusting device 1 is installed in a driving force transmission system that transmits a driving force of a crankshaft (not shown) that is a driving shaft of the internal combustion engine to a camshaft 2 that opens and closes an exhaust valve of the internal combustion engine. Adjust the opening / closing timing of the exhaust valve.

  Further, the valve timing adjusting device 1 includes a housing 18 that rotates in conjunction with a crankshaft, a vane rotor 14 that forms advance chambers 51 to 54 and retard chambers 55 to 58 between the housing 18, And an apparatus control system (not shown) for controlling the supply of hydraulic oil to the advance chambers 51 to 54 and the retard chambers 55 to 58 formed between the vane rotor 14.

The housing 18 includes a sprocket 11, a cylindrical shoe housing 12, and an annular disc-shaped front plate 13.
The shoe housing 12 has shoes 12a, 12b, 12c, and 12d as partition portions that protrude radially inward from positions that are substantially equidistant in the rotation direction on the inner peripheral wall thereof. The protruding end surfaces of the shoes 12a to 12d are arcuate when viewed from the direction perpendicular to the plane of FIG. 2 and are in sliding contact with the outer peripheral wall surface of the boss portion 14a of the vane rotor 14. A seal member 15 is fitted in the recesses of the shoes 12a to 12d. In addition, storage chambers 50 are formed between the shoes 12a to 12d adjacent in the rotation direction. Each storage chamber 50 is surrounded by the corresponding shoe side surface and the inner peripheral wall surface of the shoe housing 12, and has a fan shape when viewed from the direction perpendicular to the plane of FIG.

  The sprocket 11, the shoe housing 12 and the front plate 13 are bolted coaxially so that the shoe housing 12 is sandwiched between the front plate 13 and the sprocket 11. The sprocket 11 is connected to a crankshaft (not shown) by a chain (not shown). As a result, the housing 18 rotates in conjunction with the crankshaft when the driving force is transmitted from the crankshaft to the sprocket 11. The housing 18 rotates in the clockwise direction in FIG.

The vane rotor 14 is accommodated in the housing 18, and the advance chambers 51 to 54 and the retard chambers 55 to 58 are formed between the vane rotor 14 and the both end surfaces in the axial direction of the vane rotor 14 are the wall surfaces 11 a of the sprocket 11. And it contacts the wall surface 13a of the front plate 13 in sliding contact. The vane rotor 14 is driven to rotate relative to the housing 18 by the hydraulic pressure of the advance chambers 51 to 54 and the retard chambers 55 to 58, and is coupled to the camshaft 2 to rotate with the camshaft 2.
The positioning of the vane rotor 14 in the rotational direction with respect to the camshaft 2 is performed by fitting positioning pins 29 to the camshaft 2 and the vane rotor 14.

  3 is a view showing the vane rotor 14 alone, FIG. 3 (a) is a rear view seen from the opposite side (left side of FIG. 1) of the camshaft 2, FIG. 3 (b) is a sectional view, and FIG. 3 (c). These are the front views seen from the camshaft 2 side (right side in FIG. 1). As shown in FIG. 3, the vane rotor 14 includes a boss portion 14a and vanes 14b, 14c, 14d, and 14e.

  The bush 20 fitted to the boss portion 14 a is inserted on the inner peripheral side of the front plate 13 so as to be rotatable relative to the front plate 13 and coaxially with the camshaft 2. The boss portion 14 a is bolted to the camshaft 2 together with the bush 20. Accordingly, the vane rotor 14 and the camshaft 2 are rotated in the clockwise direction in FIG. 2 by the driving force transmitted from the housing 18 that rotates in conjunction with the crankshaft.

  Further, the vane rotor 14 can rotate relative to the housing 18 together with the camshaft 2. 2 represent the retard direction and the advance direction of the vane rotor 14 with respect to the housing 18. The arrows representing the retard direction and the advance direction shown in FIG. Incidentally, FIG. 2 shows a state where the vane rotor 14 is positioned at the most advanced position where the relative rotation in the advance direction is restricted and the relative rotation in the retard direction is allowed with respect to the housing 18.

  A torsion coil spring 22 is interposed between the front plate 13 and the bush 20. One end of the torsion coil spring 22 is locked to the shoe housing 12 and the front plate 13, and the other end is locked to the vane rotor 14. The restoring force of the torsion coil spring 22 acts as a torque for rotating the vane rotor 14 relative to the housing 18 in the advance direction.

  The vanes 14b to 14e protrude radially outward from positions on the outer peripheral wall of the boss portion 14a that are substantially equally spaced in the rotation direction, and are accommodated in the respective accommodation chambers 50. The protruding end surfaces of the vanes 14 b to 14 e are formed in an arc shape when viewed from the direction perpendicular to the plane of FIG. 2 and are in sliding contact with the inner peripheral wall surface of the shoe housing 12. A seal member 16 is fitted in a recess provided on the protruding end face of each vane 14b to 14e.

  The vanes 14b to 14e partition the corresponding accommodation chambers 50 to form advance chambers 51 to 54 and retard chambers 55 to 58 on both sides in the rotational direction. Specifically, the advance chamber 51 is between the shoe 12a and the vane 14b, the advance chamber 52 is between the shoe 12b and the vane 14c, and the advance chamber 53 is between the shoe 12c and the vane 14d. An advance chamber 54 is formed between them. Also, the retard chamber 55 is between the shoe 12d and the vane 14b, the retard chamber 56 is between the shoe 12a and the vane 14c, the retard chamber 57 is between the shoe 12b and the vane 14d, and the retard chamber 57 is between the shoe 12c and the vane 14e. A corner chamber 58 is formed.

  When the vane rotor 14 is at the most advanced position in FIG. 2 with respect to the housing 18, the volumes of the advance chambers 51 to 54 are maximized, and the volumes of the retard chambers 55 to 58 are minimized. On the other hand, when the vane rotor 14 is at the most retarded position with respect to the housing 18, the volumes of the retard chambers 55 to 58 are maximized, and the volumes of the advance chambers 51 to 54 are minimized.

  A stopper piston 26 is accommodated in the vane 14b. The stopper piston 26 is engaged with the fitting ring 27 of the sprocket 11 by the restoring force of the compression coil spring 28, thereby restraining the vane rotor 14 at the most advanced position with respect to the housing 18. On the other hand, the stopper piston 26 is disengaged from the fitting ring 27 by at least one of a hydraulic force supplied from the retard chamber 55 through the passage 29a and a hydraulic force supplied from the advance chamber 51 through the passage 29b. Displacement to the position allows relative rotation of the vane rotor 14.

The advance chambers 51 to 54 communicate with rotor side advance oil passages 61 to 64 formed in the vane rotor 14, respectively. The rotor side advance oil passages 61 to 64 are all in communication with cam side advance oil passages 71 and 72 formed in the camshaft 2 via the rotor side joining oil passages 61a and 63a. On the other hand, the retard chambers 55 to 58 communicate with rotor side retard oil passages 65 to 68 formed in the vane rotor 14, respectively. All of the rotor side retarded oil passages 65 to 68 communicate with cam side retarded oil passages 73 and 74 formed in the camshaft 2.
Note that the rotor side advance oil passages 61 to 64 correspond to “one oil passage” described in the claims, and the rotor side retard oil passages 65 to 68 correspond to “the other side” described in the claims. Is equivalent to

The cam side advance oil passages 71 and 72 and the cam side retard oil passages 73 and 74 have a shape extending in the axial direction and penetrating the inside of the camshaft 2, and are formed by drilling using a drill or the like.
As shown in FIG. 2, the rotor side advance oil passages 61 to 64 have a shape extending from the positions of the cam side advance oil passages 71 and 72 toward the advance chambers 51 to 54 as seen from the axial direction, such as drills. It is formed by drilling using The rotor side advance oil passages 61 and 62 branch from the rotor side joining oil passage 61a, and the rotor side advance oil passages 63 and 64 branch from the rotor side joining oil passage 63a.
The rotor side merge oil passages 61a and 63a have a shape extending in the axial direction inside the vane rotor 14, and are formed by drilling using a drill or the like.

The rotor-side retarded oil passages 65 to 68 are located in a portion 14 f (see FIGS. 1 and 3 (c)) of the vane rotor 14 that is in surface contact with the axial end surface 2 a (see FIG. 1) of the camshaft 2. It is formed in a groove shape that opens toward the axial end surface 2a, and extends from the position of the cam-side retarded oil passages 73, 74 toward the retarded chambers 55-58 when viewed from the axial direction as shown in FIG. Shape.
Further, the vane rotor 14 is formed by sintering, and the rotor side retarded oil passages 65 to 68 are formed by being molded by a mold for the sintering.

Further, the lubricating oil passage 2 f branches off from the cam side advance oil passages 71 and 72. The lubricating oil passage 2f has a shape extending in the radial direction of the camshaft 2, and supplies lubricating oil to the sliding clearance CL (see FIG. 4) between the outer peripheral surface 2b of the camshaft 2 and the inner peripheral surface 11b of the sprocket 11. This is the oil passage. The lubricating oil passage 2f is formed by drilling using a drill or the like.
5 is a perspective view showing the camshaft 2 and the vane rotor 14, and the hatched portion indicated by reference numeral P1 in FIG. 5 is a portion of the outer peripheral surface 2b of the camshaft 2 that forms the sliding clearance CL. Is shown.

The axial end surface 2a of the camshaft 2 and the surface contact portion 14f of the vane rotor 14 are sealed by surface contact. Further, as shown in FIG. 3C, a fitting portion 14 g extending in the axial direction along the outer peripheral surface 2 b of the camshaft 2 is formed on the outer peripheral edge of the surface contact portion 14 f of the vane rotor 14. .
Note that a halftone hatched portion indicated by reference numeral P2 in FIG. 5 indicates a portion of the outer peripheral surface 2b of the camshaft 2 that is fitted to the fitting portion 14.

A fitting clearance for fitting is formed between the outer circumferential surface 2b of the camshaft 2 and the inner circumferential surface 14h of the fitting portion 14g. A sliding clearance CL for sliding is formed between the axial end surface 14i of the fitting portion 14g and the wall surface 11a of the sprocket 11 described above.
Incidentally, the rotor-side retarded oil passages 65 to 68 formed in the groove shape are formed across the surface contact portion 14f and the fitting portion 14g.

  A portion indicated by reference numeral 2c in FIG. 1 of the camshaft 2 represents a support portion that is rotatably supported by an engine cylinder head (not shown), and annular grooves 2d and 2e are formed in the support portion 2c. Has been. Then, hydraulic oil discharged from a hydraulic pump (not shown) is supplied to one of the annular grooves 2d and 2e. In addition, which annular groove 2d, 2e is supplied is switched by controlling an electromagnetic switching valve (not shown) with an electronic control unit (ECU).

When the vane rotor 14 is rotated relative to the advance side, the operation is switched to supply hydraulic oil to the annular groove 2d. Then, the hydraulic oil discharged from the hydraulic pump flows through the annular groove 2d, the cam side advance oil passages 71 and 72, the rotor side joining oil passages 61a and 63a, and the rotor side advance oil passages 61 to 64 in order, It flows into the advance chambers 51-54.
At this time, the hydraulic oil in the retard chambers 55 to 58 flows through the rotor side retard oil passages 65 to 68, the cam side retard oil passages 73 and 74, and the annular groove 2e in this order, and then is discharged to an oil pan (not shown). Is done.

On the other hand, when the vane rotor 14 is relatively rotated to the retard side, the operation is switched so as to supply hydraulic oil to the annular groove 2e. Then, the hydraulic oil discharged from the hydraulic pump flows through the annular groove 2e, the cam-side retarded oil passages 73 and 74, and the rotor-side retarded oil passages 65 to 68 in this order, and then flows into the retarded chambers 55 to 58. .
At this time, the hydraulic oil in the advance chambers 51 to 54 flows in order through the rotor side advance oil passages 61 to 64, the rotor side merge oil passages 61a and 63a, the cam side advance oil passages 71 and 72, and the annular groove 2d. After that, it is discharged to an oil pan (not shown).

With the above configuration, when the hydraulic pump starts operating as the internal combustion engine starts to drive, the supply passage of hydraulic oil discharged from the hydraulic pump is controlled by the ECU. As a result, the hydraulic pressure of the advance chambers 51 to 54 and the hydraulic pressure of the retard chambers 55 to 58 are adjusted, and the relative rotational phase of the vane rotor 14 with respect to the housing 18 and thus the valve timing is adjusted.
On the other hand, when the internal combustion engine stops, the hydraulic pump also stops, so that hydraulic oil is not supplied to either the hydraulic pressure in the advance chambers 51 to 54 or the retard chambers 55 to 58. Then, the vane rotor 14 is relatively rotated to the most advanced position by the restoring force of the torsion coil spring 22, and the stopper piston 26 is fitted to the fitting ring 27.

According to the first embodiment described above, among the hydraulic oil supply paths from the annular grooves 2d and 2e to the advance chambers 51 to 54 and the retard chambers 55 to 58, the cam side advance oil passages 71 and 72 are provided. And the rotor side advance oil passages 61 to 64, the rotor side merge oil passages 61a and 63a, and the rotor side retard oil passages 65 to 68, both of which are downstream of the cam side retard oil passages 73 and 74. Both are formed on the vane rotor 14. Of the oil passages 61 to 64 and 65 to 68, the rotor-side retarded oil passages 65 to 68 are formed in a groove shape that opens toward the axial end surface 2 a of the camshaft 2.
Therefore, compared with the conventional structure shown in FIG. 8 in which the oil passage 111 of the advance path is formed in the sprocket 110, the housing 18 can be minimized while minimizing the size of the vane rotor 14 in the axial direction (left-right direction in FIG. 1). Can be downsized in the axial direction. Therefore, it is possible to reduce the valve timing adjusting device 1 in the axial direction.

Further, according to the first embodiment, it is unnecessary to form the oil passage 111 in the sprocket 110 as in the conventional structure of FIG. Therefore, processing of the oil passage can be concentrated on the vane rotor 14 and processing of the oil passage to the sprocket 11 can be abolished, so that processing costs can be reduced.
Moreover, since the rotor side retardation oil passages 65-68 are formed in the groove shape among both the oil passages 61-64, 65-68, the rotor side retardation oil passages 65-68 can be formed by mold forming. Therefore, since the drilling can be halved as compared with the case where both the oil passages 61 to 64 and 65 to 68 are formed in the hole shape, the processing cost can be reduced.

(Second Embodiment)
Next, the valve timing adjusting device 3 according to the second embodiment of the present invention will be described below.
6 is a perspective view showing the camshaft 2 and the vane rotor 14 of the valve timing adjusting device 3 according to the second embodiment, and FIG. 7 is a cross-sectional view showing the entire valve timing adjusting device 3.

  In the valve timing adjusting apparatus 1 according to the first embodiment, the lubricating oil passage 2f formed in the camshaft 2 branches off from the cam side advance oil passages 71 and 72, whereas in the second embodiment, In the valve timing adjusting device 3, as shown in FIG. 7, the lubricating oil passage 2 g formed in the camshaft 2 is branched from the cam side retarding oil passages 73 and 74. Note that the valve timing adjusting device 3 is the same as the valve timing adjusting device 1 according to the first embodiment for the structure other than the branching portion of the lubricating oil passage 2g.

  Here, since the rotor-side retarded oil passages 65 to 68 are formed in a groove shape that opens toward the axial end surface 2 a of the camshaft 2, the arrow F <b> 1 in FIG. 4 (b), as indicated by an arrow F2 in FIG. 6, the hydraulic oil in the rotor side retarded oil passages 65 to 68 slides between the outer peripheral surface 2b of the camshaft 2 and the inner peripheral surface 11b of the sprocket 11. Leakage into the clearance CL or the fitting clearance between the outer peripheral surface 2b of the camshaft 2 and the fitting portion 14g of the vane rotor 14 is inevitable.

  Even if the lubricating oil passages 2f and 2g are branched from any of the cam side advance oil passages 71 and 72 and the cam side retardation oil passages 73 and 74, as described above, from the rotor side retardation oil passages 65 to 68. The lubricating oil passages 2f, 2g and the rotor-side retarded oil passages 65-68 communicate with each other by the hydraulic oil leaked into the sliding clearance CL or the fitting clearance (FIGS. 4A, 4B, 5 and 5). (See FIG. 6).

  Then, of the cam side advance oil passages 71 and 72 and the cam side retard oil passages 73 and 74, the oil passage communicating with the rotor side merge oil passages 61a and 63a formed in the hole shape, that is, the cam side advance oil passage. In the case of the structure shown in FIGS. 4A and 5 in which the lubricating oil passage 2f is branched from 71 and 72, the lubricating oil passage 2f and the rotor-side retarded oil passages 65 to 68 communicate as described above. Therefore, the rotor side retarded oil passages 65 to 68 and the rotor side advanced oil passages 61 to 64 communicate with each other via the sliding clearance CL or the fitting clearance and the lubricating oil passage 2f. Therefore, in controlling the hydraulic pressures of the advance chambers 51 to 54 and the retard chambers 55 to 58, the accuracy is deteriorated, and it is difficult to accurately control the 14 relative rotational positions of the vane rotor.

  With respect to this problem, according to the structure shown in FIGS. 4B and 6, the rotor side retard angle formed in the groove shape among the cam side advance oil passages 71 and 72 and the cam side retard oil passages 73 and 74. The lubricating oil passage 2g is branched from an oil passage communicating with the oil passages 65 to 68, that is, the cam side retarded oil passages 73 and 74. Therefore, although the lubricating oil passage 2g and the rotor side retardation oil passages 65 to 68 communicate with each other, the rotor side retardation oil passages 65 to 68 and the rotor side advance oil passages 61 to 64 do not communicate with each other. The hydraulic oil in the lubricating oil passage 2g and the hydraulic oil in the rotor-side retarded oil passages 65 to 68 have the same pressure. Therefore, in controlling the hydraulic pressures of the advance chambers 51 to 54 and the retard chambers 55 to 58, it is possible to avoid deterioration of the accuracy of the hydraulic pressure.

(Other embodiments)
In each of the above-described embodiments, the oil passage formed in the groove shape is the rotor-side retarded oil passage 65-68, and the oil passage formed in the hole shape is the rotor-side advance oil passage 61-64. The oil passage formed in the shape may be the rotor side advance oil passages 61 to 64, and the oil passage formed in the hole shape may be the rotor side retardation oil passages 65 to 68.
In this case, of the cam side advance oil passages 71 and 72 and the cam side retard oil passages 73 and 74, oil passages communicating with the rotor side advance oil passages 61 to 64 formed in a groove shape, that is, If the lubricating oil passage 2g is branched from the cam side advance oil passages 71, 72, it is possible to avoid the rotor side retardation oil passages 65-68 and the rotor side advance oil passages 61-64 from communicating with each other, The same effect as the valve timing adjusting device 3 shown in FIGS. 4B and 6 is exhibited.

In each of the above-described embodiments, the example in which the present invention is applied to the valve timing adjusting devices 1 and 3 that control the valve timing of the exhaust valve has been described. . The present invention can also be applied to a device that adjusts the valve timing of the intake valve and the exhaust valve.
Although a plurality of embodiments of the present invention have been described above, the present invention is not construed as being limited to these embodiments, and can be applied to various embodiments without departing from the scope of the present invention.

It is sectional drawing which shows the valve timing adjustment apparatus which concerns on 1st Embodiment of this invention. It is II-II sectional drawing of FIG. FIG. 3 is a diagram illustrating a single vane rotor of FIG. 2, (a) is a rear view seen from the left side of FIG. 1, (b) is a sectional view, and (c) is a front view seen from the right side of FIG. It is a schematic diagram which shows the axial direction end surface etc. of a cam shaft, (a) is a figure which shows 1st Embodiment of this invention, (b) is a figure which shows 2nd Embodiment of this invention. In the valve timing adjusting device according to the first embodiment, it is a perspective view showing a distribution path of hydraulic oil and lubricating oil. It is a perspective view which shows the distribution route of hydraulic fluid and lubricating oil in the valve timing adjustment device concerning a 2nd embodiment. It is sectional drawing which shows the valve timing adjustment apparatus which concerns on 2nd Embodiment. It is sectional drawing which shows the conventional valve timing adjustment apparatus.

Explanation of symbols

  1, 3: Valve timing adjusting device, 2: Cam shaft, 2b: Cam shaft outer peripheral surface, 2a: Axial end surface of cam shaft, 2f, 2g: Lubricating oil passage, 11: Sprocket (housing), 11b: Sprocket Inner peripheral surface, 12: shoe housing (housing), 13: front plate (housing), 14: vane rotor, 14i: axial end surface of the fitting portion of the vane rotor, 14h: inner peripheral surface of the fitting portion of the vane rotor, 14g: Fitting portion of vane rotor, 18: housing, 51, 52, 53, 54: advance chamber, 55, 56, 57, 58: retard chamber, 61a: rotor side merge oil passage, 61, 62, 63, 64: Rotor side advance oil passage, 63a: Rotor side merge oil passage, 65, 66, 67, 68: Rotor side retard oil passage, 71, 72: Cam side advance oil passage, 73, 74: Cam Retard oil passage, CL: sliding clearance.

Claims (4)

Installed in a driving force transmission system that transmits a driving force from a driving shaft of the internal combustion engine to a camshaft that opens and closes at least one of an intake valve and an exhaust valve, and adjusts an opening / closing timing of at least one of the intake valve and the exhaust valve A valve timing adjusting device,
A housing that rotates in conjunction with the drive shaft;
The camshaft rotates in conjunction with the camshaft, forms an advance chamber and a retard chamber with the housing, and is driven to rotate relative to the housing by the hydraulic pressure of the advance chamber and the retard chamber. Vane rotor,
With
The vane rotor includes a rotor side advance oil passage that communicates a cam side advance oil passage formed in the camshaft and the advance chamber, a cam side retard oil passage formed in the camshaft, and the retard. A rotor-side retarded oil passage communicating with the corner chamber;
One of the rotor side advance oil passage and the rotor side retard oil passage is formed in a hole shape penetrating the inside of the vane rotor,
The other oil passage of the rotor side advance oil passage and the rotor side retard oil passage is located in a portion of the vane rotor that is in surface contact with the axial end surface of the camshaft and directed toward the axial end surface. A valve timing adjusting device formed in a groove shape that opens. The outer peripheral surface of the camshaft slides with the inner peripheral surface of the housing along with the relative rotation and is supported in the radial direction by the inner peripheral surface,
The camshaft has a lubricating oil path for supplying lubricating oil to a sliding clearance between the outer peripheral surface and the inner peripheral surface,
The valve timing adjusting device according to claim 1, wherein the lubricating oil passage is an oil passage branched from the cam-side advance oil passage or the cam-side retard oil passage.   3. The valve timing according to claim 2, wherein the lubricating oil passage branches from an oil passage communicating with the other oil passage formed in a groove shape among the cam-side advance oil passage and the cam-side retard oil passage. Adjustment device. The vane rotor is formed by sintering,
The valve timing adjusting device according to any one of claims 1 to 3, wherein the other oil passage formed in a groove shape is formed by a mold for sintering.

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