JP2002188414A - Valve opening-closing timing control apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a housing body in the radial direction, without impairing the sealing characteristics of the oil chamber. SOLUTION: A driving member 3 is constituted of a housing body 31, which forms an oil chamber 35 in between a driven member 2 disposed radially and outward of the driven member 2, and first and second plate members 32, 33, 34 which cover the housing body 31 and are connected to one another via a sealing member 38.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve timing control device.

[0002]

2. Description of the Related Art Conventionally, as this type of valve opening / closing timing control apparatus, one disclosed in Japanese Patent Application Laid-Open No. H11-241606 is known. This is achieved by a drive member linked to the drive shaft of the internal combustion engine, a driven member linked to the camshaft of the internal combustion engine, which rotatably supports the drive member, and a vane provided between the drive member and the driven member. And a partitioned hydraulic chamber.

In this conventional apparatus, a drive member is disposed radially outside of a driven member and forms a hydraulic chamber with the driven member. Consists of a fixed front plate and rear plate,
The hydraulic chamber is closed by the front and rear plates,
The O-ring seals the space between the housing body and the front and rear plates, and prevents the oil supplied to the hydraulic chamber from leaking to the outside.

[0004]

However, in the conventional apparatus described above, in order to ensure the sealing property of the hydraulic chamber formed between the housing body of the driving member and the driven member, the hydraulic apparatus is fixed to both end faces of the housing body. The hydraulic chamber is closed by the front plate and the rear plate, and the space between the housing body and the front plate and the rear plate is sealed by the O-ring. Requires space. For this reason, the housing body becomes thicker in the radial direction,
As a result, the size of the housing body increases in the radial direction, resulting in an increase in weight.

Accordingly, an object of the present invention is to reduce the size of the housing body in the radial direction without impairing the sealing performance of the hydraulic chamber.

[0006]

In order to solve the above-mentioned technical problem, the technical means adopted in the present invention is that a driving member is disposed radially outside a driven member and a hydraulic chamber is provided between the driven member and the driven member. And a first and a second plate member that cover the housing body and are joined to each other via a seal member.

According to this technical means, the housing body is covered by the first and second plate members joined to each other via the seal member. Thereby, it is possible to prevent the oil supplied to the hydraulic chamber from leaking to the outside of the leak, thereby ensuring the sealing performance of the hydraulic chamber. Further, since the seal member is disposed between the first plate and the second plate, the housing body does not require a space for disposing the seal member, and the housing body can be made thinner in the radial direction by that much. Therefore, the housing body can be downsized in the radial direction.

More preferably, the first plate member cooperates with the second plate member so as to sandwich the housing body in the axial direction, and a front plate disposed on one end surface of the housing body and the housing body. And a front cover that covers the front plate and is joined to the second plate member via the seal member.

More preferably, the second plate member includes a rear plate disposed on the other end surface of the housing body so as to sandwich the housing body in the axial direction in cooperation with the front plate. It is good to have a pulley fixed to a rear plate and linked to the drive shaft via a timing belt.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a valve timing control apparatus includes a rotor member 2 integrally mounted on a tip end of a camshaft 1 and a relative rotation of the rotor member 2 within a predetermined range. It comprises a housing member 3 which is externally provided and a pulley 4 which is linked to a crankshaft (not shown) of the internal combustion engine via a timing belt (not shown).

The camshaft 1 has a cam (not shown) for opening and closing an intake valve (not shown) of the internal combustion engine, and is rotatably supported by a cylinder head cover 5 of the internal combustion engine.

The rotor member 2 is integrally fastened and fixed to the front end (left side in FIG. 1) of the camshaft 1 in the axial direction by bolts 23. The rotor member 2 extends outward in the radial direction (vertical direction in FIG. 1) around its outer periphery, and a housing main body 31 of the housing member 3 described later.
Is provided with a vane 6 for partitioning the hydraulic chamber 35 formed into a hydraulic chamber 35 into an advance chamber and a retard chamber.

The housing member 3 comprises a housing body 31 which is thick in the axial direction and a front plate 3 which is thin in the axial direction.
2, a rear plate 33, and a front cover 34. The housing body 31 includes the rotor member 2.
A hydraulic chamber 35 is formed on the inner peripheral surface 31a facing the rotor member 2 and is partitioned by the vane 6 into an advanced oil chamber and a retard oil chamber. The front plate 32 has substantially the same diameter as the housing main body 31 and is disposed in contact with the front end face 31b of the housing main body 31 in the axial direction, and closes the front side of the hydraulic chamber 35. The rear plate 33 has a diameter larger than that of the housing main body 31 and is disposed in contact with a rear end face 31 c of the housing main body 31 in the axial direction, and closes a rear side of the hydraulic chamber 35. The front plate 32 and the rear plate 33 are fastened and fixed by bolts 36 so as to sandwich the housing body 31 in the axial direction. The rear plate 33 is rotatably supported by the camshaft 1, and a pulley 4 is fastened by bolts 37 to an outer peripheral portion 33 a protruding radially outward from an outer peripheral surface 31 d of the housing body 31. Fixed.

The front cover 34 is formed from a single thin plate by press molding or the like, and includes a bottom wall 34a and a peripheral wall 34.
b and a hat shape provided with a brim wall 34c. The front cover 34 has a bottom wall 34 a facing the front surface of the front plate 33, a peripheral wall 34 b facing the outer peripheral surface 31 d of the housing body 31, and a brim wall 34 c facing the front surface of the outer peripheral portion 33 a of the rear plate 33. , The front plate 33 and the housing body 31,
The brim wall 34c is fastened together with the pulley 4 by bolts 37 and fastened and fixed to the rear plate 33. An annular concave groove 33b is formed on the front surface of the outer peripheral portion 33a of the rear plate 33 facing the flange wall 34c.
An O-ring 38 that is in close contact with the brim wall 34c is fitted into b. As described above, the housing body 31 and the front plate 32 are covered with the front cover 34, and the front cover 34 and the rear plate 33 are
Sealing is performed at 8 to thereby ensure the sealing property of the hydraulic chamber 35. Also, a concave groove 33b into which the O-ring 38 is inserted.
Is formed on the rear plate 33 and the O-ring 38 is in close contact with the brim wall 34c of the front cover 34. This eliminates the need to secure a space for disposing the O-ring 38 in the housing main body 31. The size is reduced in the direction to reduce the weight. Also, the location of the O-ring 38 is also reduced to one, which contributes to a reduction in the number of assembly steps and an improvement in reliability. A hole 34d for fastening the bolt 23 is formed in a bottom wall 34a of the front cover 34, and the hole is liquid-tightly closed by a cap 34e.

Next, the operation of the valve timing control apparatus configured as described above will be described.

The advance chamber and the retard chamber of the hydraulic chamber 35 are supplied with oil from supply passages communicating with each other. The torque transmitted from the crankshaft of the internal combustion engine to the pulley 4 is transmitted from the housing member 3. The supplied oil is transmitted to the rotor member 2, thereby rotating the pulley 4 and the camshaft 1 integrally. As a result, the cam of the internal combustion engine is rotated in synchronization with the crankshaft of the internal combustion engine. The oil supplied to the hydraulic chamber 35 covers the housing body 31 and the front plate 32 of the housing member 3 forming the hydraulic chamber 35 with a front cover 34,
Moreover, since the front cover 34 is fastened and fixed to the rear plate 33 via the O-ring 38, the oil does not leak from the hydraulic chamber 35 to the outside.

When the pressure of the oil generated in the advance chamber and the retard chamber of the hydraulic chamber 35 is adjusted by adjusting the amount of oil supplied in this state, the housing member 3 rotates relative to the rotor member 2, The positional relationship of the camshaft 1 with respect to the pulley 4 is changed. Thereby, the timing of rotation of the cam of the internal combustion engine with respect to the drive shaft of the internal combustion engine is adjusted.

As shown in FIG. 2, the screw hole of the rear plate 33 into which the bolt 36 is screwed is formed as a bottomed hole 33c, so that the sealing performance around the bolt 36 can be secured.
Reliability can be further improved.

In the present embodiment, the pulley 4 is fixed to the rear plate 33 and is linked to the crankshaft via a timing belt, but a gear may be used instead of the pulley 4.

[0020]

According to the present invention, the housing body of the drive member in which the hydraulic chamber is formed is covered by the first and second plate members joined to each other via the seal member.
The housing main body can be reduced in the radial direction while ensuring the sealing performance of the hydraulic chamber, and the weight can be reduced. or,
The seal member can be kept to a minimum, and assemblability and reliability can be improved.

Further, according to the present invention, the sealability of the hydraulic chamber is required only by adding a front cover which covers the housing body to the first plate member and is joined to the second plate member via a seal member. Each component can be shared with a valve opening / closing timing control device that does not need to be used, so that productivity can be improved and cost can be improved.

[Brief description of the drawings]

FIG. 1 is a front view of a valve timing control apparatus according to the present invention.

FIG. 2 is a front view corresponding to FIG. 1 showing a first modification of the valve timing control apparatus according to the present invention.

[Explanation of symbols]

 2 rotor member (driven member) 3 housing member (drive member) 4 pulley 6 vane 31 housing main body 32 front plate (first plate member) 33 rear plate (second plate member) 34 front cover (first plate member) 35 hydraulic pressure Chamber 38 O-ring (seal member)

Claims (3)

[Claims] A driving member linked to a drive shaft of the internal combustion engine; a driven member linked to a camshaft of the internal combustion engine for rotatably supporting the driving member; and a driving member and the driven member. A valve opening / closing timing control device having a hydraulic chamber provided between the driven member and a hydraulic chamber partitioned by a vane, wherein the drive member is disposed radially outside the driven member and forms a hydraulic chamber between the driven member and the driven member. A first and a second plate member that cover the housing body and are joined to each other via a seal member.
Valve timing control device. 2. The front plate, wherein the first plate member is disposed on one end surface of the housing body so as to sandwich the housing body in the axial direction in cooperation with the second plate member; The valve timing control apparatus according to claim 1, further comprising a front cover that covers a front plate and is joined to the second plate member via the seal member. 3. A rear plate disposed on the other end surface of the housing body so as to sandwich the housing body in the axial direction with the housing body in cooperation with the front plate, and the rear plate. 3. The valve opening / closing control device according to claim 2, further comprising a pulley fixed to the drive shaft and linked to the drive shaft via a timing belt. 4.