JP3191865B2 - Valve timing adjustment device for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine (hereinafter referred to as "internal combustion engine").
The opening / closing timing of at least one of an intake valve and an exhaust valve of an “internal combustion engine” (hereinafter referred to as an engine)
The present invention relates to a valve timing adjusting device for changing "opening / closing timing" according to operating conditions.

[0002]

2. Description of the Related Art JP-A-5-2149 discloses a valve timing adjusting device for adjusting at least one of an intake valve and an exhaust valve of an engine.
No. 07 and Japanese Utility Model Laid-Open No. 2-50105 are known. These valve timing adjusting devices use a vane as a driving force transmitting means for transmitting a driving force from a crankshaft as a drive shaft of an engine to a camshaft as a driven shaft. The vane is accommodated in the housing so as to be relatively rotatable, and the phase difference of the vane with respect to the housing is controlled by hydraulic pressure of hydraulic oil or the like.

[0003]

Problems to be Solved by the Invention
The housing of the valve timing adjusting device disclosed in Japanese Patent Publication No. 7 (1995) is composed of one peripheral wall and two side walls covering both axial end surfaces of the peripheral wall. When the housing is formed of three members as described above, the following problem occurs.

(1) A seal member is required at the joint surface between the peripheral wall and each side wall to prevent leakage of the working fluid, so that the number of parts is increased and the seal member is provided at the joint surface between the peripheral wall and each side wall. The outer diameter of the housing is increased by the amount of the groove for disposing. (2) Due to variations in processing accuracy and assembly accuracy of each member, misalignment of bearings on both side walls constituting the housing increases.

A valve timing adjusting device having a housing made of three members is disclosed in Japanese Utility Model Laid-Open No. 2-5010.
In the device disclosed in Japanese Patent Application Laid-Open No. 5 (1999) -1995, the gear side wall and the peripheral wall constituting the housing are integrally formed, so that the above-mentioned problem can be solved. However,
With such a structure, the diameter of the gear side wall is determined by the diameter of the peripheral wall of the housing, so that the diameter of the gear side wall cannot be reduced, and the size of the whole components is restricted. Further, when the peripheral wall of the housing and one of the side walls are formed integrally, there is a problem that the corner of the inner wall between the peripheral wall and the side wall becomes dull and the sealing property at the corner of the inner wall is reduced. Also,
The material is also restricted in terms of hardness, strength and the like.

Regardless of the configuration of the housing member, as shown in FIG. 11, in order to seal a hydraulic chamber to which hydraulic oil for driving the vane 110 is supplied, a sealing member 112 is provided on a rotary sliding portion between the vane 110 and the housing member 111. When the seal member 112 has a high aggressiveness with respect to the housing member 111, a portion of the housing member 111 having a high sliding frequency with the seal member 112 is worn more than a portion having a low sliding frequency, and 111a are formed. As shown in FIG. 11, when the seal member 112 approaches the step 111a, the seal member 112 receives hydraulic pressure in the direction of arrow A from the housing member 111 side, and the seal member 112
It may be pushed to the 0 side. Then, vane 110
Hydraulic oil leaks between the hydraulic chambers provided on both sides in the circumferential direction, making it difficult to hold the vane 110 at the position shown in FIG. Such local wear of the housing member hinders holding and controlling the vane at the intermediate position. Although it is possible to prevent the wear of the housing member by forming the housing member with an iron-based material having high hardness, there is a problem that the manufacturing cost increases and the weight of the housing member cannot be reduced.

Here, the aggressiveness refers to the degree to which a sliding member is worn. If the aggressiveness is high, it is easy to wear, and if the aggressiveness is low, it is hard to wear. SUMMARY OF THE INVENTION An object of the present invention is to provide a valve timing adjustment device that has good sealing performance, has a small number of parts, and can be downsized. Another object of the present invention is to provide a valve timing adjusting device which can reduce the manufacturing cost and realize the weight reduction, and can control the phase difference between the drive shaft and the driven shaft with high accuracy.

[0008]

According to the valve timing adjusting device for an engine according to the first aspect of the present invention, one side wall and the peripheral wall of the housing member are made of aluminum die-cast.
And the other side wall is the drive shaft or driven shaft.
Equipped with a timing gear that rotates with either
With this configuration, the diameter of the side wall receiving the driving force can be reduced regardless of the diameter of the peripheral wall of the housing member. Therefore, the physique of the device can be reduced.

Furthermore, the number of parts constituting the housing member is reduced and the number of joints between the members is reduced, so that the sealing performance is improved. Furthermore, the number of parts of the housing member and the sealing member is reduced, so that the assembling becomes easy.
Furthermore, the reduction in the number of components of the housing member reduces the misalignment due to variations in processing accuracy and assembly accuracy. Furthermore, since the side wall receiving the driving force and the peripheral wall are not integrally formed, the side wall receiving the driving force receives the driving force with the peripheral wall of the housing member regardless of the required characteristics (for example, hardness and strength). The material of the member that integrally forms the side wall on the other side can be selected to be, for example, aluminum.

According to the valve timing adjusting device for an engine according to the first aspect of the present invention, since the housing member is formed of aluminum die-casting , the processing of the housing member is facilitated and the device is reduced in weight. According to the valve timing adjusting device for an engine according to the second aspect of the present invention, the seal member provided on the rotary sliding portion between the housing member and the vane member is formed of a softer material than the housing member. The wear of the member can be reduced. Therefore, it is possible to prevent a decrease in sealing performance due to wear of the housing member.

Further, even if the inner wall corner between the peripheral wall and the side wall of the integrally formed bowling member is not formed at a right angle, the seal member is worn in the shape of the inner wall corner,
There is no need to form a relief shape at the corner of the vane member corresponding to the corner of the inner wall of the housing member. Therefore, the leakage of the working fluid from the clearance caused by forming the relief shape in the vane member can be prevented, and the responsiveness caused by the leakage of the working fluid can be prevented.

According to the valve timing adjusting device for an engine according to the third aspect of the present invention, since the sealing member is formed of resin, the processing of the sealing member is easy and the cost can be reduced. According to the valve timing adjusting device for an engine according to the fourth aspect of the present invention, the seal member is formed of PPS (polyphenylene sulfide) resin having excellent oil resistance and low swelling, thereby reducing the deterioration of the seal member and improving the sealability. Can be held.

[0013] According to the engine valve timing adjusting apparatus according to claim 5 of the present invention, by a rigid than PPS resin PPS resin by blending a Mohs hardness of 5 or less of an inorganic filler to form a seal member, sliding The abrasion powder of the housing member generated by the movement and foreign matter that has entered from the outside are discharged to the outside of the housing member together with the abrasion powder of the filler without being caught by the seal member. Therefore, damage to the sliding surface of the housing member with the vane member due to the wear powder of the housing member can be reduced.

[0014]

[0015]

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

[0022]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an engine valve timing adjusting apparatus according to an embodiment of the present invention. The timing gear 1 as a side wall of the housing member shown in FIG. 1 is coupled with a crankshaft as a drive shaft of an engine (not shown) by a gear train (not shown) to transmit a driving force, and rotates in synchronization with the crankshaft. The camshaft 2 as a driven shaft receives a driving force from the timing gear 1 and opens and closes at least one of an intake valve and an exhaust valve (not shown). The camshaft 2 is rotatable with a predetermined phase difference with respect to the timing gear 1. The timing gear 1 and the camshaft 2 rotate clockwise as viewed from the arrow X direction shown in FIG. Hereinafter, this rotation direction is referred to as an advance direction.

A rear plate 18 formed on a thin plate is interposed between the timing gear 1 and the shoe housing 3. The rear plate 18 prevents oil leakage from between the timing gear 1 and the shoe housing 3. The timing gear 1, the shoe housing 3, and the rear plate 18 form a housing member as a driving-side rotating body, and are coaxially fixed by bolts 20.

The shoe housing 3 comprises a peripheral wall 4 and a front plate 5 as a side wall, and is integrally formed by aluminum die casting. Since the shoe housing 3 is formed separately from the timing gear 1, the timing gear 1 can have a smaller outer diameter than the shoe housing 3. As shown in FIG. 2, the shoe housing 3 has trapezoidal shoes 3a formed at substantially equal intervals in the circumferential direction.
3b and 3c. Fan-shaped space portions 40 as accommodation chambers for accommodating vanes 9a, 9b, 9c as vane members are formed in three circumferential gaps of the shoes 3a, 3b, 3c, respectively. Has an arc-shaped cross section.

As shown in FIG. 3, an inner wall corner 3d formed by the peripheral wall 4 of the shoe housing 3 and the front plate 5
Is not right angle but blunt. The dullness of the inner wall corner 3d is caused by mold wear in the case of molding by a mold and cutting tool wear in the case of cutting. In this embodiment, the axial length L ₁ between the front plate 5 and the rear plate 18 is L ₁ =
It is set to 22 to 25 mm.

As shown in FIG. 2, the vane rotor 9 as a vane member is provided with vanes 9a, 9 at substantially equal intervals in the circumferential direction.
b, 9c, and the vanes 9a, 9b, 9c are rotatably accommodated in a fan-shaped space formed in a circumferential gap between the shoes 3a, 3b, 3c. As shown in FIG. 1, the vane rotor 9 and the bush 6 are integrally fixed to the camshaft 2 by bolts 21 and form a driven-side rotating body. The bush 6 fixed integrally with the vane rotor 9 is fitted to the inner peripheral wall of the front plate 5 so as to be relatively rotatable.

As shown in FIGS. 2 and 4, a minute clearance 50 is provided between the outer peripheral wall of the vane rotor 9 and the inner peripheral wall of the peripheral wall 4. The size of the clearance 50 avoids interference between the inner wall corner 3 d and the corner of the vane rotor 9, as well as the shoe housing 3 and the vane rotor 9.
Is set in consideration of misalignment with the center. As shown in FIG. 3, the seal member 16 is fitted into a groove 9e formed on the outer peripheral wall of the vanes 9a, 9b, 9c and a groove 9e formed on the outer peripheral wall of the boss 9d of the vane rotor 9 (not shown). are doing. FIG. 3 does not show the leaf spring 17. The seal member 16 is formed by using a PPS resin as a base material and blending an inorganic filler harder than the PPS resin. Since the PPS resin is excellent in oil resistance, hardly deteriorates, and hardly swells, it is preferable to use the PPS resin as the seal member 16. PPS
The resin and the inorganic filler to be compounded are the shoe housing 3
It is softer. Each of the sealing members 16 is a leaf spring 17
Is pressed toward the radially outer peripheral wall 4 by the urging force and the centrifugal force, thereby preventing the hydraulic oil from leaking through the clearance 50 between the hydraulic chambers. Instead of PPS resin, PAI (polyamideimide), PI (polyimide), PEEK (polyetheretherketone), PE
T (polyethylene terephthalate), PBT (polybutylene terephthalate), PEN (polyethylene naphthalate), PA (polyamide), POM (polyoxymethylene), phenol resin, and Teflon resin may be used.

The axial length L of the sealing member 16_Two Is L₁ ≧ L_Two 
Is set to The vane rotor 9 shown in FIG.
The protrusion amount f of the seal member 16, that is, the clearance 5
For the size of 0, the inside diameter of the shoe housing 3 is a,
The outer diameter of the rotor 9 is b, and the blunt dimension of the inner wall corner 3d is c (FIG.
4), it is expressed by the following equation (1). f = ab> c + (axis shift amount between shoe housing 3 and vane rotor 9) (1) P shown in FIG.₁ Is the seal member 16 received from the advance hydraulic chamber.
Operating hydraulic pressure, P _Two Indicates that the seal member 16 is a retard hydraulic chamber
It shows the operating oil pressure received from the engine. D is a seal member
16 represents the thickness.

A retard hydraulic chamber 10 is formed between the shoe 3a and the vane 9a, a retard hydraulic chamber 11 is formed between the shoe 3b and the vane 9b, and a retard hydraulic chamber 11 is formed between the shoe 3c and the vane 9c. A hydraulic chamber 12 is formed. Also, shoe 3
a and a vane 9b, an advanced hydraulic chamber 13 is formed between the shoe 3b and the vane 9c, and an advanced hydraulic chamber 14 is formed between the shoe 3c and the vane 9a. Is formed.

With the above configuration, the camshaft 2 and the vane rotor 9 can rotate coaxially with respect to the timing gear 1 and the shoe housing 3. As shown in FIG. 1, the guide ring 19 is press-fitted and held on the inner wall of the vane 9 a forming the accommodation hole 23, and the guide ring 19 is
, A stopper piston 7 is inserted. Therefore, the stopper piston 7 is accommodated in the vane 9 a so as to be slidable in the axial direction of the camshaft 2, and is urged toward the front plate 5 by the spring 8. The stopper hole 5a is formed in the front plate 5, and the stopper hole 5a
A guide ring 22 having a tapered hole 22a is press-fitted and held. The stopper piston 7 can be fitted into the tapered hole 22a by the urging force of the spring 8. The communication passage 24 formed in the timing gear 1 communicates with the housing hole 23 on the right side of the flange 7a and is open to the atmosphere, so that the movement of the stopper piston 7 is not hindered.

The hydraulic chamber 37 on the left side of the flange portion 7a communicates with the advance hydraulic chamber 15 via an oil passage 39. When hydraulic oil is supplied to the advance hydraulic chamber 15, the stopper piston 7 comes out of the tapered hole 22a against the urging force of the spring 8. The hydraulic chamber 38 formed at the tip of the stopper piston 7 communicates with the retard hydraulic chamber 10 via an oil passage 41 shown in FIG. When the hydraulic oil is supplied to the retard hydraulic chamber 10, the stopper piston 7 comes out of the tapered hole 22a against the urging force of the spring 8.

Position of stopper piston 7 and tapered hole 22
The position a indicates that the camshaft 2 is at the most retarded position with respect to the crankshaft,
When the vane rotor 9 is at the most retarded position, the stopper piston 7 is set to be fitted in the tapered hole 22a. The stopper piston 7 and the tapered hole 22a constitute a lock mechanism.

As shown in FIGS. 1 and 2, the boss 9d of the vane rotor 9 is provided with an oil passage 29 at a contact portion with the bush 6, and an oil passage 33 at a contact portion with the camshaft 2. Is provided. Oil passages 29 and 33
Are each formed in an arc shape. The oil passage 29 communicates with a hydraulic pressure source or a drain (not shown) as driving means via oil passages 27 and 25. Further, the oil passage 29 is provided with retard hydraulic chambers 10, 11, 12 by oil passages 30, 31, 32.
And is in communication with the hydraulic chamber 38 via an oil passage 41.

The oil passage 33 communicates with a hydraulic source or a drain (not shown) as driving means via oil passages 28 and 26. Further, the oil passage 33 communicates with the advance hydraulic chambers 13, 14, 15 via oil passages 34, 35, 36, and communicates with the hydraulic chamber 37 via the advance hydraulic chamber 15 and the oil passage 39. Next, the operation of the valve timing device will be described.

During normal operation of the engine, the retard hydraulic chambers 10, 1
The stopper piston 7 comes out of the tapered hole 22a by the hydraulic pressure of the operating oil supplied to the advance hydraulic chambers 1, 12, and 15, so that the vane rotor 9 can rotate relative to the shoe housing 3. The phase difference of the camshaft 2 with respect to the crankshaft is adjusted by controlling the hydraulic pressure applied to each hydraulic chamber.

When the engine stops, the retard hydraulic chamber 10,
Since the operating oil is no longer supplied to the hydraulic chambers 11, 12, and the advance hydraulic chambers 13, 14, 15, the vane rotor 9 stops at the most retarded position shown in FIG. Hydraulic chamber 3
Since the operating oil is not supplied to 7 and 38, the stopper piston 7 is fitted into the tapered hole 22a by the urging force of the spring 8.

Even if the engine is restarted, the retard hydraulic chamber 1
Until hydraulic oil is supplied to the hydraulic chambers 0, 11, 12, and the advance hydraulic chambers 13, 14, 15, the stopper piston 7 has the tapered hole 22.
a, the camshaft 2 is held at the most retarded position with respect to the crankshaft. As a result, the vane rotor 9 is locked to the front plate 5 until the hydraulic oil is supplied to each hydraulic chamber, so that the shoe housing 3 and the vane rotor 9 are prevented from colliding with each other due to the fluctuation torque of the cam.

When hydraulic oil is supplied to each of the retard hydraulic chambers or the advance hydraulic chambers and hydraulic oil is supplied to the hydraulic chambers 37 or 38, the stopper piston 7 receives a force to the right in FIG. 8, the stopper piston 7 comes out of the tapered hole 22a. As a result, the coupling between the front plate 5 and the vane rotor 9 by the lock mechanism is released, so that the operating pressure applied to the retard hydraulic chambers 10, 11, 12 and the advance hydraulic chambers 13, 14, 15 causes the shoe housing 3 to be actuated. As a result, the vane rotor 9 relatively rotates, and the relative phase difference of the camshaft 2 with respect to the crankshaft is adjusted.

Next, the wear process of the seal member 16 will be described with reference to FIG. FIG. 7 does not show the groove 9 e and the leaf spring 17. As shown in FIG.
In an initial state in which the seal member 16 is fitted in the groove 9e, all corners of the seal member 16 are right angles. Since the seal member 16 is pushed in the direction of the arrow by the urging force and centrifugal force of the leaf spring 17, the force concentrates on the corner of the seal member 16 that slides on the inner wall corner 3d. Since the seal member 16 is formed of a softer material than the shoe housing 3,
As time elapses, as shown in FIG. 7B, the corners of the seal member 16 sliding on the inner wall corners 3d, that is, the shoulders, wear. When the wear further proceeds and the entire inner wall corner 3d and the seal member 16 slide, the concentration of the force on the worn corner of the seal member 16 is eliminated.
As a result, the initial wear is completed, and thereafter, a transition is made to steady wear.

As described above, when the shape of the corner 3d of the inner wall and the shape of the corner of the sealing member 16 match, the sealing member 16
Since the clearance between the hydraulic chamber and the peripheral wall 4 is almost eliminated, the leakage of hydraulic oil between the hydraulic chambers can be favorably reduced by the seal member 16. Next, the shoe housing 3 and the sealing member 16 depending on the difference of the inorganic filler compounded in the sealing member 16 are described.
FIG. 8 shows the result of measuring the amount of wear of.

As shown in FIG. 8B, a barbell 101 is placed on an aluminum plate 100, and a constant pressure P is applied to the barbell 101 so that the aluminum plate 100
Was rotated at a speed V, and the wear amount of the aluminum plate 100 and the barbell 101 was measured. Barbell 101
Is a PPS resin, P = 0.5 kgf / mm ² , V =
0.5 m / s.

As a result of the measurement, as shown in FIG.
Barbell 101 using only PPS resin without inorganic filler
Although the aluminum plate 100 has a relatively small amount of wear, the barbell 101 has a large amount of wear because the PPS resin is a soft material. Although the PPS resin is a soft material, the amount of wear of the aluminum plate 100 is larger than that of a material filled with talc or potassium titanate because the aluminum plate 100
This is because the aluminum powder generated from the PPS resin is embedded in the barbell 101 because the PPS resin is a soft material, and the aluminum plate 100 is worn by the embedded aluminum powder. Potassium titanate is formed in a small needle shape.

Although the PPS resin alone is larger than the PPS resin filled with talc or potassium titanate, the amount of wear of the aluminum plate 100 is large, but is within the range usable as the seal member 16. Since the material filled with GF (glass fiber) is a material having a hard GF (hardness 7 to 8), the wear amount of the barbell 101 is small, but the wear amount of the aluminum plate 100 is large. That is,
Since GF has a high aggressiveness to the shoe housing 3 and increases the wear amount of the shoe housing 3, GF is not suitable as an inorganic filler to be mixed into the seal member 16. However, by blending GF into the seal member 16 as described later, the coefficient of linear expansion of the seal member 16 approaches the shoe housing 3 and the sealing performance can be improved. GF may be used as the filler if the main purpose is to make the linear expansion coefficient close to the above.

On the other hand, the one filled with 50% talc or 30% potassium titanate is an aluminum plate 10
0 and the abrasion amount of the barbell 101 were both small. That is, it has been found that it is more effective to mix the PPS resin with an inorganic filler having an appropriate hardness in forming the seal member 16. Talc and potassium titanate have a Mohs hardness of 2, 4, respectively. In addition to talc and potassium titanate, any brittle material that is harder than the PPS resin and has a Mohs hardness of 5 or less can be used as an inorganic filler for filling the seal member 16. For example, clay (hardness 2), mica (hardness 3), aluminum hydroxide (hardness 3), walathnite (hardness 4.5), graphite (hardness 1-2), and zinc oxide (hardness 4.2). It is also possible to use carbon fiber (hardness 1-2) other than the inorganic filler. These fillers do not drop off from the surface of the seal member 16 by sliding with iron or aluminum to form holes, but the filler wears, and the generated wear powder of the filler removes aluminum powder and foreign substances. Discharge together with the outside. The amount of these fillers is 5% by weight in the molding material.
~ 70% is preferred. The reason is that if the compounding amount is less than 5%, the sliding effect with the shoe housing 3 is not sufficient, and if it exceeds 70%, kneading with the PPS resin becomes difficult and the flow during injection molding becomes poor. It is. More preferably, it is 30 to 60%. A blending amount of 30 to 60% is preferable when the housing member is made of aluminum, and a seal member having a linear expansion coefficient close to that of aluminum can be obtained. For example, good sealing properties can be maintained over the entire operating temperature range of -40 ° C to 150 ° C.

Further, by blending these fillers with the base material of the seal member 16, the coefficient of linear expansion of the seal member 16 approaches that of the shoe housing 3. Shoe housing 3
The difference in the coefficient of linear expansion between the shoe housing 3 and the seal member 16 is reduced, so that even when the seal member 16 and the shoe
The axial clearance between the seal member 16 and the
There is no increase in the amount of leakage, and the seal member 16 slides on the inner wall of the shoe housing 3 with a substantially uniform force. Therefore, it is possible to prevent the seal member 16 from being excessively worn and preventing oil leakage between the hydraulic chambers. If the main purpose is to bring the coefficient of linear expansion closer to the shoe housing 3, GF may be blended into the seal member 16 as a filler as described above.

Materials which are less aggressive to the inner shoe housing 3 of the filler and hard to wear the shoe housing 3 are talc, clay, acicular potassium titanate, carbon fiber, graphite, and acicular zinc oxide.
Further, although there is no effect of bringing the coefficient of linear expansion of the seal member 16 close to that of the shoe housing 3, the Teflon resin having low aggressiveness is powdered and filled in the base material such as the above-mentioned PPS resin to thereby attack the shoe housing 3. Properties can be further reduced. By using the powdered Teflon resin in combination with the above-described filler, the coefficient of linear expansion can be made closer to the shoe housing 3 and the shoe housing 3
Can be reduced.

FIG. 9 shows a comparative example in which sealing is performed by directly sliding the shoe housing 60 and the vane rotor 61 without using a sealing member in this embodiment. The shoe housing 60 of the comparative example also has the peripheral wall and one of the side walls formed integrally. An inner wall corner 60a is also formed in the shoe housing 60 of the comparative example similarly to the present embodiment. In order to avoid interference with the inner wall corner 60a, a corner 61a of the vane rotor 61 is notched, and a clearance 62 is formed by the notch of the corner 61a. If hydraulic oil leaks into the clearance 62, the pressure in the hydraulic chamber will decrease.
The control responsiveness of the valve timing decreases. Furthermore, since the shoe housing 60 and the vane rotor 61 slide directly, high processing accuracy in the radial direction between the shoe housing 60 and the vane rotor 61 is required. Furthermore,
When the sliding portion between the shoe housing 60 and the vane rotor 61 is worn, clearance is easily formed in the sliding portion. Hydraulic oil leaks from this clearance, and control responsiveness of valve timing is reduced.

On the other hand, in this embodiment, the sealing member 1
6 is worn and the shape of the corner of the sealing member 16 matches the shape of the corner of the inner wall, so that the clearance shown in the comparative example is not formed. Furthermore, since the seal member 16 is softer than the shoe housing 3, the amount of wear of the sliding surface of the peripheral wall 4 with the seal member 16 is reduced. Therefore, the sealing member 1
6 prevents local wear of the peripheral wall 4 that frequently slides with the
Since the leakage of hydraulic oil can be reduced, the control response of the valve timing is improved. Further, since no hydraulic oil leaks at a specific position, the vane rotor 9 can be reliably held at an arbitrary position. Also, shoe housing 3
There is no need to slide the blade and the vane rotor 9 directly in the radial direction. Furthermore,
Since the metal shoe housing 3 and the vane rotor 9 do not slide in the radial direction, wear of each other can be prevented.

Further, as in a modification of this embodiment shown in FIG. 10, a chamfer 55a may be provided in advance on the shoulder of the sealing member 55 corresponding to the inner wall corner 3d so as to cover the dullness of the inner wall corner 3d. . In this embodiment, of the shoulders at both ends in the longitudinal direction of the seal member 55, only the shoulder facing the inner wall corner 3d is provided with a chamfer 55a, and the other shoulder is made a sharp right-angled corner. Therefore, while almost along the inner wall corner 3d,
It also matches the corner formed by the shoe housing 3 and the rear plate 18. Thereby, the seal member 55 slides on the peripheral wall 4 and the inner wall of the front plate 5 from the beginning when the seal member 55 is assembled, so that oil leakage between the hydraulic chambers can be prevented. In a modified example, only one shoulder has a chamfer 55
Although a is provided, a chamfer 55a may be provided on the other shoulder. By providing the chamfers 55a on both shoulders, the chamfers 55a face the inner wall corners 3d even when the positions of the shoulders of the seal member are reversely assembled.

In the above-described embodiment, the shoe housing 3 is formed by integrally forming the peripheral wall 4 and the front plate 5 by aluminum die casting.
Are formed separately from the timing gear 1. Therefore, the outer diameter of the timing gear 1 can be reduced as much as possible irrespective of the outer diameter of the shoe housing 3, so that not only the housing member including the shoe housing 3 and the timing gear 1 but also the entire physical size can be reduced.

In this embodiment, a PPS resin softer than the shoe housing 3 is used as the base material of the seal member 16, and this PPS resin is harder than the PPS resin and softer than the shoe housing 3 and has a Mohs hardness of 5 or less. By mixing the materials, the shoe housing 3 can be formed of aluminum. Therefore, the shoe housing was reduced in weight, and workability was improved.

Further, foreign substances such as aluminum powder of the shoe housing 3 and iron powder mixed in the working oil generated by sliding are discharged together with wear powder generated when the inorganic filler compounded in the seal member 16 is worn. Therefore, the sealing member 1
It is possible to prevent the sliding surface of the shoe housing 3 that slides with the aluminum housing 6 from being worn by aluminum powder or foreign matter. In this embodiment,
Although the shoe housing 3 as the housing member is formed by integrally forming the peripheral wall 4 and the front plate 5 as the side wall, the housing member may be formed without integrally forming the peripheral wall and the side wall. Also in this case, by disposing a seal member formed of a resin material softer than the housing member on the rotary sliding portion between the housing member and the vane member, the wear of the housing member is reduced, and the localization of the housing member is reduced. Wear can be reduced. Accordingly, leakage of hydraulic oil in the rotary sliding portion, particularly leakage of hydraulic oil at a specific position, is reduced, and high-precision phase control of the vane member with respect to the housing member such as holding the vane member at an intermediate position is reliably performed. be able to.

Further, in this embodiment, since the inner peripheral wall of the peripheral wall 4 and the outer peripheral wall of the vane rotor 9 are sealed by the sealing member 16, it is not necessary to machine the radial clearance between the shoe housing 3 and the vane rotor 9 with high precision. . Therefore, processing of the member becomes easy. In the present invention, when the shoe housing is formed of an iron-based sintered material, the seal member may be formed of aluminum, resin or rubber, and when the shoe housing is formed of aluminum, the seal member may be formed of rubber.

In the present embodiment, the configuration is adopted in which the rotational driving force of the crankshaft is transmitted to the camshaft 2 by the timing gear 1, but a configuration using a timing pulley, a chain sprocket, or the like is also possible.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a valve timing adjusting device according to an embodiment of the present invention.

FIG. 2 is a transverse sectional view showing the valve timing adjusting device of the present embodiment.

FIG. 3 is a schematic longitudinal sectional view including a seal member of the present embodiment.

FIG. 4 is a schematic longitudinal sectional view showing a clearance between a peripheral wall and a vane rotor according to the present embodiment.

FIG. 5 is a schematic cross-sectional view showing an operation state of the seal member of the embodiment.

FIG. 6 is an enlarged view of a main part of FIG. 5;

FIG. 7 is a sectional view showing a wear process of the seal member;
(A) shows an initial state, (B) shows an intermediate state,
(C) shows the final state.

FIG. 8A is a characteristic diagram showing a relationship between a filler filling a seal member and a wear amount, and FIG. 8B is a schematic diagram showing a test jig for the wear amount.

FIG. 9 is a schematic sectional view showing a comparative example of the present embodiment.

FIG. 10 is a schematic sectional view showing a modification of the present embodiment.

FIG. 11 is a schematic cross-sectional view showing a state of wear of a housing by a conventional sealing member.

[Explanation of symbols]

Reference Signs List 1 timing gear (housing member, one side wall) 2 cam shaft (driven shaft) 3 shoe housing (housing member) 3a, 3b, 3c shoe 4 peripheral wall (housing member) 5 front plate (housing member, other side wall) 7 stopper Piston 9 Vane rotor (vane member) 9a, 9b, 9c Vane (vane member) 16 Seal member 40 Fan-shaped space (accommodation chamber) 55 Seal member 55a Chamfer

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masayasu Ushida 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture, Denso Co., Ltd. 72) Inventor Isamu Inai 1-1-1, Showa-cho, Kariya-shi, Aichi Pref. Denso Corporation (56) References JP-A-8-121122 (JP, A) JP-A-6-264903 (JP, A) 10-89021 (JP, A) JP-A-9-303119 (JP, A) JP-A-2-50105 (JP, U) Japan Institute of Invention and Innovation Public Technical Report No. 87-8631 (58) Fields surveyed (Int .Cl. ⁷ , DB name) F01L 1/34

Claims (5)

(57) [Claims] 1. A driving force transmission system for transmitting driving force from a driving shaft of an internal combustion engine to a driven shaft that opens and closes at least one of an intake valve and an exhaust valve of the internal combustion engine, wherein the driving shaft or the driven shaft is provided. a housing member rotating together with one of, and rotate with the other of the drive shaft or the driven shaft, rotatable relative only to a predetermined angular range in the accommodation chamber formed in the radial direction in the side of the peripheral wall of said housing member A housing member, and a hydraulically driven driving means for relatively rotating the housing member and the vane member by liquid pressure, wherein the housing member has one side wall, a peripheral wall and The other
The peripheral wall has a shoe forming the accommodation chamber, and the one side wall and the peripheral wall are formed by aluminum die casting.
The other side wall is formed integrally with the one side wall.
It is separate from the side wall and the peripheral wall, and the drive shaft or the
Timing gear that rotates with one of the driven shafts
A valve timing adjusting device for an internal combustion engine, comprising: 2. The internal combustion engine according to claim 1, wherein a seal member made of a material softer than the housing member is provided at a rotary sliding portion between the housing member and the vane member. Valve timing adjustment device. 3. The valve timing adjusting device for an internal combustion engine according to claim 2, wherein said seal member is made of resin. 4. The valve timing adjusting device for an internal combustion engine according to claim 3, wherein said seal member is made of PPS resin. 5. The sealing member is made of PPS resin.
5. The valve timing adjusting device for an internal combustion engine according to claim 4, wherein the valve timing adjusting device is formed by mixing an inorganic filler having a Mohs hardness of 5 or less than a resin.