JP2014181582A - Negative pressure pump integrated cylinder head cover - Google Patents

Abstract

A cylinder head cover integrated with a negative pressure pump capable of reducing the manufacturing cost and improving the support strength of a rotor is provided.
A cylinder head cover part 2 covering a camshaft 5 of an engine, a housing body part 4 formed integrally with the cylinder head cover part 2 and having a pump chamber A formed therein and constituting a part of a negative pressure pump 3; And a first through hole 11 into which the rotor 7 of the negative pressure pump 3 connected to the camshaft is inserted. The first through hole 11 is formed in the connecting portion 14 that connects the cylinder head cover portion 2 and the housing main body portion 4.
[Selection] Figure 1

Description

  The present invention relates to a negative pressure pump-integrated cylinder head cover in which a part of a negative pressure pump is integrally formed with a cylinder head cover.

  A vehicle is equipped with a brake booster for reducing the driver's braking force. Conventionally, a negative pressure is applied to the brake booster by connecting the brake booster to the intake manifold. However, in recent years, as the throttle valve is not used, it is described in Patent Document 1. Furthermore, negative pressure has been applied to the brake booster by a negative pressure pump that utilizes the rotation of the engine.

  The negative pressure pump described in Patent Document 1 is a vane pump that utilizes the rotation of a camshaft of an engine, and a housing body that has a pump chamber formed therein, and a housing cover that is attached to the housing body so as to close the pump chamber And a vane for partitioning the pump chamber, and a rotor connected to the camshaft of the engine for rotating the vane. And the housing main body is assembled | attached to the cylinder head cover which covers a cam shaft, and the rotor is connected with the cam shaft of the engine.

Japanese Patent No. 4733356

  However, if the cylinder head cover and the housing body of the negative pressure pump are separate members, the cylinder head cover and the housing body of the negative pressure pump must be manufactured separately, and the housing body of the negative pressure pump is attached to the cylinder head cover. As a result, there is a problem that the manufacturing cost is increased because an operation for assembling the cylinder head and an operation for sealing between the cylinder head cover and the housing main body of the negative pressure pump occur. In addition, if the housing body of the negative pressure pump is not sufficiently assembled to the cylinder head cover, there is a problem that the support strength of the rotor is lowered.

  Therefore, an object of the present invention is to provide a cylinder head cover integrated with a negative pressure pump that can reduce the manufacturing cost and improve the support strength of the rotor.

  A cylinder head cover integrated with a negative pressure pump according to the present invention includes a cylinder head cover portion that covers a camshaft of an engine, a cylinder head cover portion, and a housing that forms a part of the negative pressure pump by forming a pump chamber therein. A main body portion, and a first through hole formed in a connecting portion that connects the cylinder head cover portion and the housing main body portion and into which a rotor of a negative pressure pump coupled to the camshaft is inserted.

  According to the cylinder head cover integrated with the negative pressure pump according to the present invention, since the cylinder head cover portion and the housing main body portion of the negative pressure pump are integrally formed, the manufacturing cost can be reduced. In addition, since the rotor is inserted into the first through hole formed in the connection portion that connects the cylinder head cover portion and the housing main body portion, the support strength of the rotor can be improved.

  By the way, in order to integrally form the cylinder head cover part and the housing main body part of the negative pressure pump, it is preferable that the material of the cylinder head cover part and the housing main body part of the negative pressure pump are the same. From the viewpoint of cost reduction, it is preferable that the material of the cylinder head cover portion and the housing main body portion of the negative pressure pump is the same resin.

  However, although resin can be used as the material for the cylinder head cover portion, there is no room for selection other than metal as the material for the housing body portion of the negative pressure pump for the following reason. That is, since the negative pressure pump has the vane in contact with the inner peripheral surface of the housing main body, when the engine rotates at a high speed, the shear resistance of oil interposed between the vane and the inner peripheral wall of the housing main body is reduced. The driving pressure of the negative pressure pump increases due to the negative pressure, and further, there arises a problem that seizure or wear occurs due to running out of lubricating oil or an increase in sliding energy. For this reason, conventionally, it has not been possible to employ a resin as a material for the housing body of the negative pressure pump.

  In view of such problems, the present inventors have made extensive studies on the technology for integrating the cylinder head cover portion and the housing main body portion of the negative pressure pump. It came to the knowledge that the negative pressure pump which does not generate is obtained. In addition, a patent application is separately filed for the invention based on this knowledge.

  Therefore, the present invention can utilize such knowledge to make the cylinder head cover part and the housing main body part made of resin. Thereby, while being able to integrate a cylinder head cover part and the housing main-body part of a negative pressure pump easily, weight reduction and cost reduction can be achieved.

  Moreover, the bush which supports a rotor can be inserted in the 1st through-hole. Thus, since the rotor is supported via the bush, the rotor can be smoothly rotated with respect to the first through hole.

  Moreover, it can further have a 2nd through-hole formed in a connection part and arrange | positioned at the lower part of a pump chamber. In this way, the second through hole can be formed in the lower portion of the pump chamber, so that even if oil is sucked into the pump chamber, the oil sucked into the pump chamber lubricates each drive section of the pump chamber. Since the oil is discharged from the second through-hole, it is possible to prevent the pressure in the pump chamber from increasing due to oil accumulated in the pump chamber.

  Further, a chamber chamber may be formed on the cylinder head cover side of the second through hole. As described above, since the chamber chamber is formed on the cylinder head cover portion side of the second through-hole, the second through-hole and the inner space of the cylinder head cover portion are connected via the chamber chamber. Even if the pump chamber is opened to the inner space of the cylinder head cover portion, it is possible to make it difficult for oil to be sucked into the pump chamber. Moreover, at the second through-hole, an exhaust sound for exhausting air from the pump chamber is generated, but the air exhausted from the second through-port is reflected by the air exhausted from the second through-port. Since this momentum is weakened, the discharge sound generated at the second through-hole can be reduced.

  According to the present invention, the manufacturing cost can be reduced and the support strength of the rotor can be improved.

It is sectional drawing of the engine upper part which attached the negative pressure pump integrated cylinder head cover. It is sectional drawing in the II-II line shown in FIG. It is a figure which shows the structure of the vane of a 3rd means.

  Hereinafter, an embodiment of a cylinder head cover integrated with a negative pressure pump according to the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected about the element which is the same or it corresponds in each figure, and the overlapping description is abbreviate | omitted.

  FIG. 1 is a cross-sectional view of an upper part of an engine to which a negative pressure pump-integrated cylinder head cover is attached, and FIG. 2 is a cross-sectional view taken along the line II-II shown in FIG. As shown in FIGS. 1 and 2, the negative pressure pump-integrated cylinder head cover 1 is formed by integrally forming a cylinder head cover portion 2 and a housing main body portion 4 constituting a part of the negative pressure pump 3. It is.

  The cylinder head cover portion 2 constitutes a part of the negative pressure pump integrated cylinder head cover 1 and is a cover that covers the camshaft 5 disposed on the upper part of the engine. A space inside the cylinder head cover portion 2 is a camshaft housing space B in which the camshaft 5 is housed.

  The material of the cylinder head cover portion 2 is not particularly limited, but is preferably a resin from the viewpoint of weight reduction and cost reduction. For example, polyamide (PA) or polyphthalamide (PPA) can be used as the resin that is the material of the cylinder head cover portion 2 from the viewpoint of heat resistance. Among these, it is preferable to employ polyamide from the viewpoint of cost. From the viewpoint of strength, it is preferable to disperse chopped strands such as glass fibers in the resin, or to impregnate the resin with fiber fabrics such as glass fibers.

  The housing main body 4 constitutes a part of the negative pressure pump integrated cylinder head cover 1 and a part of the negative pressure pump 3.

  Here, the negative pressure pump 3 will be described in detail.

  The negative pressure pump 3 constitutes a part of the negative pressure pump integrated cylinder head cover 1 and has a housing main body 4 in which a pump chamber A is formed, and is attached to the housing main body 4 so as to close the pump chamber A. A housing cover 6, a rotor 7 connected to the camshaft 5, and a vane 8 that partitions the pump chamber A and is driven to rotate by the rotor 7 are provided.

  The pump chamber A is a space having a substantially circular cross section, and is opened on the housing cover 6 side. Note that the cross-sectional shape of the pump chamber A is not limited to a perfect circle, and may be, for example, an ellipse or a deformed circle.

  The housing body 4 includes a connecting portion 14 connected to the cylinder head cover portion 2. Further, the housing main body 4 is formed with a first through-hole 11, a second through-hole 12, and a third through-hole 13 that penetrate the housing main body 4 and communicate with the pump chamber A. The first through-hole 11 is a through-hole for inserting the rotor 7 and arranging the rotor in the pump chamber A. The first through-hole 11 is formed in the connecting portion 14 and communicates the pump chamber A and the camshaft housing space B. Yes. The second through-hole 12 is a through-hole for discharging the air and oil of the pump chamber A to the camshaft housing space B, and is formed in the connection portion 14 to communicate the pump chamber A and the camshaft housing space B. ing. The third through hole 13 is a through hole for applying the negative pressure in the pump chamber A to the brake booster.

  The first through-hole 11 is formed at a position eccentric from the center position of the pump chamber A. For this reason, the rotation center of the rotor 7 inserted into the first through-hole 11 is a position eccentric from the center position of the pump chamber A.

  The second through-hole 12 is disposed in the lower part of the pump chamber A in order to discharge the oil in the pump chamber A to the camshaft housing space B.

  A chamber chamber C is formed on the second through-hole 12 on the camshaft housing space B side (cylinder head cover portion 2 side). The chamber C is a space disposed between the second through-hole 12 and the camshaft housing space B. For this reason, the air and oil discharged from the second through-hole 12 pass through the chamber chamber C and are then discharged into the camshaft housing space B. The chamber chamber is formed in a cave shape extending in the vertical direction. The chamber chamber C communicates with the second through-hole 12 in the upper part, and communicates with the camshaft accommodation space B in the lower part. Specifically, in the chamber chamber C, a hanging wall portion 16 that partitions the chamber chamber C and the camshaft housing space B is formed in front of the second through-hole 12, and below the hanging wall portion 16, A communication port 15 for communicating the chamber chamber C and the camshaft housing space B is formed.

  The housing cover 6 is attached to the housing body 4 to close the opening of the pump chamber A. The housing cover 6 can be attached to the housing body 4 by, for example, fastening with a plurality of bolts or fusion. When bolts are used, it is preferable that a packing such as an O-ring is sandwiched between the housing body 4 and the housing cover 6 in order to maintain airtightness between the housing body 4 and the housing cover 6.

  The material of the housing body 4 and the housing cover 6 is not particularly limited, but is preferably a resin from the viewpoint of weight reduction and cost reduction. For example, polyamide (PA) or polyphthalamide (PPA) can be used as the resin that is the material of the housing body 4 and the housing cover 6 from the viewpoint of heat resistance. Among these, it is preferable to employ polyamide from the viewpoint of cost. From the viewpoint of strength, it is preferable to disperse chopped strands such as glass fibers in the resin, or to impregnate the resin with fiber fabrics such as glass fibers.

  The cylinder head cover portion 2 and the housing body portion 4 integrally formed as the negative pressure pump integrated cylinder head cover 1 may be the same material or different materials, but from the viewpoint of ease of manufacture. Are preferably the same material, and are preferably the same resin material from the viewpoint of weight reduction and cost reduction. For example, when the material of the cylinder head cover portion 2 and the material of the housing main body portion 4 are the same resin, the cylinder head cover portion 2 and the housing main body portion 4 can be integrally formed by general injection molding. Further, when the material of the cylinder head cover portion 2 is made of resin and the material of the housing main body portion 4 is made of metal such as aluminum, the cylinder head cover portion 2 and the housing main body portion 4 can be integrally formed by insert molding. . Further, when the material of the cylinder head cover portion 2 and the material of the housing main body portion 4 are made of the same metal such as aluminum, the cylinder head cover portion 2 and the housing main body portion 4 can be integrally formed by casting or cutting. it can. In addition, the technique which uses the raw material of the housing main-body part 4 as resin is mentioned later.

  The rotor 7 is disposed in the pump chamber A, a connecting end portion 71 connected to the camshaft 5, a central support portion 72 inserted into the first through-hole 11 and rotatably supported by the connection portion 14. And a support end 73 that slidably supports the vane 8.

  The connecting end portion 71 is connected to the camshaft 5 directly or indirectly so that the rotational drive of the camshaft 5 is transmitted. The connection structure between the connection end portion 71 and the camshaft 5 may be any structure as long as it can transmit the rotational drive without sliding.

  The center support part 72 is formed in a cylindrical shape. The central support portion 72 is rotatably supported by the connection portion 14 via a bush 74 press-fitted into the first through hole 11 of the connection portion 14.

  The support end 73 is formed in a cylindrical shape. The support end 73 is formed with a support groove 75 into which the vane 8 is inserted. The support groove 75 is a groove cut out along a straight line that passes through the central axis of the support end 73 and is orthogonal to the central axis. For this reason, the support end 73 can slidably support the vane 8 in a direction passing through the central axis of the support end 73 and orthogonal to the central axis by inserting the vane 8 into the support groove 75. It is possible.

  And the connection end part 71, the center support part 72, and the support end part 73 are connected in series so that the center axis line of the connection end part 71, the center support part 72, and the support end part 73 may correspond.

  The vane 8 is an elongated plate-like member that is slidably supported by the rotor 7 and partitions the pump chamber A into two spaces. The vane 8 is substantially divided into two in the plate thickness direction, a first plate-shaped first vane portion 81 having a tip 81a abutting against the inner peripheral wall 17 of the housing body 4 forming the pump chamber A, and a pump chamber. And an elongated plate-like second vane portion 82 whose tip 82a is in contact with the inner peripheral wall 17 of the housing main body portion 4 forming A. The first vane portion 81 and the second vane portion 82 are formed in the same shape. The vane 8 is inserted into the support groove 75 of the support end 73 in a state where the first vane portion 81 and the second vane portion 82 are overlapped so as to be point-symmetric.

  The means for bringing the tip 81a of the first vane portion 81 and the tip 82a of the second vane portion 82 into contact with the inner peripheral wall 17 of the housing body 4 is not particularly limited, and is realized by, for example, the following means. be able to.

  The vane 8 of the first means is such that the center of gravity of the first vane portion 81 is positioned on the tip 81 a side with respect to the rotor 7, and the center of gravity of the second vane portion 82 is positioned on the tip 82 a side with respect to the rotor 7. In this way, the distal end 81a of the first vane portion 81 and the distal end 82a of the second vane portion 82 are moved by the centrifugal force generated in the first vane portion 81 and the second vane portion 82 due to the rotation of the rotor 7. The inner peripheral wall 17 of the part 4 can be pressed.

  The vane 8 of the second means urges (pushes) the tip 81a of the first vane portion 81 toward the inner peripheral wall 17 side of the housing main body 4 by an urging means (not shown) such as a spring and the second vane. The tip 82 a of the portion 82 is urged (pushed) toward the inner peripheral wall 17 side of the housing body 4. By doing so, the front end 81a of the first vane portion 81 and the front end 82a of the second vane portion 82 are connected to the inner peripheral wall 17 of the housing main body portion 4 by the biasing force of the biasing means regardless of whether the rotor 7 is rotated. Can be pressed.

  By the way, when the tip 81a of the first vane portion 81 and the tip 82a of the second vane portion 82 are pressed against the inner peripheral wall 17 of the housing main body portion 4 as in the first means and the second means, the following problems occur. That is, when the engine rotates at a high speed, the driving torque of the negative pressure pump 3 increases due to the shear resistance and negative pressure of the oil interposed between the vane 8 and the inner peripheral wall 17 of the housing body 4, There arises a problem that seizure and wear occur due to running out of lubricating oil and an increase in sliding energy. For this reason, in a structure like the 1st means or the 2nd means, there existed a problem that resin could not be adopted as a material of housing body part 4, the 1st vane part 81, and the 2nd vane part 82.

  In view of such a problem, as a result of earnestly examining the technology for integrating the cylinder head cover portion 2 and the housing main body portion 4 of the negative pressure pump 3, the present inventors have conducted the following third means. It came to the knowledge that the negative pressure pump 3 which does not generate | occur | produce said problem even if an engine rotates at high rotation is obtained.

  FIG. 3 is a view showing the structure of the vane of the third means. As shown in FIG. 3, the vane 8 of the third means is configured such that the tip 81 a of the first vane portion 81 and the tip 82 a of the second vane portion 82 are connected to the inner peripheral wall 17 of the housing body 4 by a biasing means 83 such as a spring. And the first vane portion 81 and the second vane portion 82 are subjected to a centrifugal force generated by the rotation of the rotor 7 to generate a load P2 in a direction opposite to the urging direction of the urging means 83. It is a structure. The biasing means 83 pushes the tip 81a of the first vane portion 81 and the tip 82a of the second vane portion 82 toward the inner peripheral wall 17 side of the housing main body portion 4, and uses, for example, a spring such as a coil spring. Some use magnetic force or hydraulic pressure.

  Such a load P <b> 2, for example, positions the center of gravity of the first vane part 81 on the opposite side of the tip 81 a of the first vane part 81 with respect to the rotor 7, and the center of gravity of the second vane part 82 is It can be generated by positioning it on the opposite side of the tip 82a of the two vane portion 82.

  Moreover, the setting of such a gravity center position can be performed as follows, for example. That is, the weight portion 81b is formed on the opposite side of the tip 81a of the first vane portion 81 with respect to the rotor 7, and the weight portion 82b is formed on the opposite side of the tip 82a of the second vane portion 82 with respect to the rotor 7. The average density of the first vane portion 81 on the opposite side of the tip 81a with respect to the rotor 7 is made higher than the average density on the tip 81a side of the first vane portion 81 with respect to the rotor 7, and the rotor 7 of the second vane portion 82 The average density on the side opposite to the tip 82a is set higher than the average density on the tip 82a side of the second vane portion 82 with respect to the rotor 7. Further, the volume of the first vane portion 81 on the opposite side of the tip 81a with respect to the rotor 7 is made larger than the volume on the tip 81a side of the first vane portion 81 with respect to the rotor 7, and the tip of the second vane portion 82 with respect to the rotor 7 is set. The volume on the opposite side of 82a is made larger than the volume on the tip 82a side of the second vane portion 82 with respect to the rotor 7.

  According to the vane 8 of the third means configured as described above, when the rotor 7 is stopped, the front end 81a of the first vane portion 81 and the second vane portion 82 are driven by the biasing force P1 of the biasing means 83. The tip 82 a is pressed against the inner peripheral wall 17 of the housing body 4. Thereby, the pump chamber A is separated by the vane 8 in the state where the airtightness is maintained between the tip 81a of the first vane part 81 and the tip 82a of the second vane part 82 and the inner peripheral wall 17 of the housing body part 4. Divided into spaces.

  When the rotor 7 rotates and centrifugal force is generated in the first vane portion 81 and the second vane portion 82, the urging force P1 of the urging means 83 acts on the first vane portion 81 and the second vane portion 82. A load P2 in the direction opposite to the biasing direction is generated.

  For this reason, as the rotational speed of the rotor 7 increases, the pressing force of the tip 81a of the first vane portion 81 and the tip 82a of the second vane portion 82 against the inner peripheral wall 17 of the housing body 4 decreases. When the rotational speed of the rotor 7 exceeds a predetermined value, the load P2 generated in the first vane portion 81 and the second vane portion 82 exceeds the urging force P1 of the urging means 83, and the tip 81a of the first vane portion 81 is reached. The tip 82 a of the second vane portion 82 is separated from the inner peripheral wall 17 of the housing main body portion 4. Therefore, when the rotational speed of the rotor 7 exceeds a predetermined value, the vane 8 is in a state where the tip 81a of the first vane portion 81 and the tip 82a of the second vane portion 82 and the inner peripheral wall 17 of the housing body 4 are separated from each other. Therefore, friction does not occur between the tip 81a of the first vane part 81 and the tip 82a of the second vane part 82 and the inner peripheral wall 17 of the housing main body part 4.

  Normally, the negative pressure pump is set to have a pump performance that can apply a sufficient negative pressure even at the rotational speed of the rotor at idling. Therefore, when the rotational speed of the rotor increases because the driver steps on the accelerator. The pump performance of the negative pressure pump becomes excessive. Therefore, as in the third means, when the rotor 7 rotates at a high rotation, the tip 81a of the first vane portion 81 and the tip 82a of the second vane portion 82 and the inner peripheral wall 17 of the housing main body portion 4 are separated. Even if there is a gap, the increase in the transfer amount that increases with the increase in the rotational speed of the rotor 7 balances with the leakage amount of air leaking from the gap, and appropriate pump performance can be maintained.

  For this reason, by configuring the vane 8 as the third means, it is possible to employ resin as the material of the housing main body portion 4, the first vane portion 81, and the second vane portion 82. For example, polyamide (PA) or polyphthalamide (PPA) can be used as the resin that is the material of the first vane portion 81 and the second vane portion 82 from the viewpoint of heat resistance. Among these, it is preferable to employ polyamide from the viewpoint of cost. From the viewpoint of strength, it is preferable to disperse chopped strands such as glass fibers in the resin, or to impregnate the resin with fiber fabrics such as glass fibers. However, the material of the first vane portion 81 and the second vane portion 82 is not limited to resin, and can be various materials.

  The third through-hole 13 described above is formed at a position where one space partitioned by the vane 8 expands as the vane 8 rotates, and the above-described second through-hole 12 is partitioned by the vane 8. The other space is formed at a position that is narrowed by the rotation of the vane 8.

  For this reason, when the rotor 7 rotates in the direction of arrow R in FIG. 3, one space partitioned by the vanes 8 expands in a state of being communicated with the third through-hole 13. Thereby, a negative pressure is applied to the brake booster. On the other hand, the other space partitioned by the vane 8 is narrowed in a state where it is communicated with the second through-hole 12. Thereby, the air sucked from the third through-hole 13 is discharged from the second through-hole 12 to the camshaft housing space B of the cylinder head cover portion 2.

  As described above, according to the negative pressure pump-integrated cylinder head cover 1 according to this embodiment, the cylinder head cover portion 2 and the housing main body portion 4 of the negative pressure pump 3 are integrally formed. Can be reduced. Moreover, since the rotor 7 is inserted into the first through-hole 11 that penetrates the cylinder head cover portion 2 and the housing body portion 4 that are integrally formed in this way, the support strength of the rotor 7 can be improved. . Furthermore, since the rotor 7 is supported via the bush 74 press-fitted into the first through hole 11, the rotation of the rotor 7 with respect to the first through hole 11 can be made smooth.

  Further, since the cylinder head cover portion 2 and the housing main body portion 4 of the negative pressure pump 3 are made of resin, the negative pressure pump integrated cylinder head cover 1 can be manufactured by simple injection molding. And the housing main body 4 of the negative pressure pump 3 can be easily integrated, and weight reduction and cost reduction can be achieved.

  In addition, the second through-hole 12 and the camshaft housing space B are communicated with each other via the chamber chamber C, and a hanging wall portion 16 that partitions the chamber chamber C and the camshaft housing space B is formed in front of the second through-hole 12. In addition, since a communication port 15 is formed below the vertical wall portion 16 to communicate the chamber chamber C and the camshaft housing space B, the negative pressure pump chamber A opens to the camshaft housing space B. Even if it is done, oil can be made difficult to be sucked into the pump chamber A from the camshaft housing space B. On the other hand, even if oil is sucked into the pump chamber A from the camshaft housing space B, the oil sucked into the pump chamber A lubricates each drive part of the pump chamber A and is discharged from the second through-hole 12. Therefore, the oil in the pump chamber A can be prevented from increasing the pressure in the pump chamber A.

  In addition, the second through-hole 12 generates a discharge sound that discharges air from the pump chamber A, but the air discharged from the second through-hole 12 is reflected by the hanging wall portion 16 of the chamber chamber C. Since the momentum of the air discharged from the second through-hole 12 is weakened, the exhaust sound generated at the second through-hole 12 can be reduced.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in the embodiment described above, the vane is formed in a plate shape and the vane is divided into the first vane portion and the second vane portion in the plate thickness direction. However, the shape and structure of the vane are not limited to this. It can change suitably without being limited to.

DESCRIPTION OF SYMBOLS 1 ... Negative pressure pump integrated cylinder head cover, 2 ... Cylinder head cover part, 3 ... Negative pressure pump, 4 ... Housing main-body part, 5 ... Cam shaft, 6 ... Housing cover, 7 ... Rotor, 8 ... Vane, 11 ... 1st Through hole, 12 ... Second through hole, 13 ... Third through hole, 14 ... Connection part, 15 ... Communication port, 16 ... Vertical wall part, 17 ... Inner peripheral wall, 71 ... Connection end part, 72 ... Central support part, 73 ... Support end, 74 ... Bush, 75 ... Support groove, 81 ... First vane part, 81a ... Tip, 81b ... Weight part, 82 ... Second vane part, 82a ... Tip, 82b ... Weight part, 83 ... A biasing means, A ... pump chamber, B ... cam shaft housing space (inner space of the cylinder head cover part), C ... chamber chamber.

Claims (5)

A cylinder head cover that covers the camshaft of the engine;
A housing body part integrally formed with the cylinder head cover part and having a pump chamber formed therein and constituting a part of the negative pressure pump;
A first through hole into which a rotor of the negative pressure pump connected to the camshaft is inserted is formed at a connection portion connecting the cylinder head cover portion and the housing main body portion;
Having
Cylinder head cover with integrated negative pressure pump. The cylinder head cover part and the housing main body part are made of resin.
The cylinder head cover integrated with a negative pressure pump according to claim 1. A bush that supports the rotor is inserted into the first through hole,
The cylinder head cover integrated with a negative pressure pump according to claim 1 or 2. A second through hole formed in the connection portion and disposed at a lower portion of the pump chamber;
The negative pressure pump-integrated cylinder head cover according to any one of claims 1 to 3. A chamber chamber is formed on the cylinder head cover side of the second through-hole,
The negative pressure pump-integrated cylinder head cover according to claim 4.

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