JPH0558891U - Automotive vacuum pump - Google Patents

Abstract

(57) [Abstract] [Purpose] Lubricant is sufficiently fed to the rolling bearing 8a provided facing the gear train of the automobile engine. [Structure] A second oil supply passage 21 is provided in a substrate 1 supporting a rolling bearing 8a. The inner end opening of the oil supply passage 21 is opposed to the rolling bearing 8a. The outer end opening of the second oil supply passage 21 faces the inner peripheral surface 4 a of the tubular portion 4 of the housing 6. During operation, a part of the lubricating oil collected on the inner peripheral surface 4a by centrifugal force is sent to the rolling bearing 8a through the second oil supply passage 21.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The automobile vacuum pump according to the present invention is used for discharging air in a vacuum tank by being assembled in a vehicle running engine.

[0002]

[Prior Art]

 In the case of a vacuum booster built into a vehicle brake, the negative pressure stored in the vacuum tank in advance during braking is sent to the booster cylinder of the vacuum booster. Further, the air in the vacuum tank is exhausted by a vacuum pump driven by a running engine, and the inside of the vacuum tank is always kept at a negative pressure above a certain level.

As a vacuum pump for an automobile used for such an application, one having a structure as shown in FIG. 3 has been conventionally used. A through hole 2 is formed in a central portion of a substrate 1 fixed to a side surface of an automobile engine, and an intermediate portion of a drive shaft 3 is rotatably supported inside the through hole 2 by a rolling bearing 8a. There is.

On the outer side surface (lower side surface in FIG. 3) of the substrate 1, there is a bottomed cylindrical shape in which the outer end opening of the cylindrical portion 4 having a cylindrical inner peripheral surface is closed by the closing plate portion 5. The housing 6 is fixed. A bearing concave hole 7 is formed at a position deviated from the center of the inner side surface of the closing plate portion 5 (upper side surface in FIG. 3) and aligned with the through hole 2 of the substrate 1. The tip of the drive shaft 3 is rotatably supported inside the drive shaft 7 by means of a slide bearing 8b. A driven gear 9 is fixed to the inner end of the drive shaft 3 (upper end in FIG. 3) protruding from the inner side surface of the substrate 1, and the driven gear 9 and the crank of the automobile engine are fixed. It meshes with a drive gear (not shown) that rotates in synchronization with the rotation of the shaft.

A rotor 10 is fixed to an inner portion of the cylindrical portion 4 at an intermediate portion of the drive shaft 3. A plurality of vane grooves 11, 11 are formed in the rotor 10 in the radial direction in a state of opening on the outer peripheral surface 10 a of the rotor 10. The vanes 12 and 12 are fitted in the plurality of vane grooves 11 and 11 one by one, respectively, with the slides extending in the radial direction.

A portion of the inner peripheral edge of each vane 12, 12 (upper end portion in FIG. 3) that protrudes from the inner end surface (upper end surface in FIG. 3) of the rotor 10 is formed on the outer surface of the substrate 1. The outer peripheral surface of the convex portion 13 is slidably contacted via a slide plate 14. The outer peripheral surface 14a of the convex portion 13 and the sliding plate 14 is concentric with the inner peripheral surface 4a of the cylindrical portion 4 of the housing 6, and the distance L between the outer peripheral surface 14a and the inner peripheral surface 4a is the same as that of the vanes. The width dimension W of 12 and 12 is the same or slightly larger (L ≧ W). Therefore, as the rotor 10 rotates, the vanes 12 and 12 move in and out of the vane grooves 11 and 11 while sliding the outer peripheral edges 12a and 12a and the inner peripheral surface 4a into sliding contact with each other.

Between the inner peripheral surface 4a of the cylindrical portion 4 and the outer peripheral surface 10a of the rotor 10 which are eccentric to each other, as shown in FIG. 2 showing an embodiment of the present invention, as shown in FIG. A gap 15 is formed in which the width dimension changes. The gap 15 is divided into a plurality of closed spaces 16a, 16b, 16c by the vanes 12, 12 coming in and out of the vane grooves 11, 11 as described above.

Further, in a portion of the cylindrical portion 4 of the housing 6 where the width of the above-mentioned gap 15 widens as the rotor 10 rotates, an intake port 17 communicating with this gap 15 is provided. An exhaust port 18 communicating with the gap 15 is provided in a part of the cylindrical portion 4 where the width of the gap 15 narrows as the rotor 10 rotates. The exhaust port 18 is communicated with the inside of the automobile engine through a through hole 19 provided in the substrate 1.

Further, an oil supply passage 20 is provided in the closing plate portion 5 of the housing 6, and one end of the oil supply passage 20 is an outlet of an oil supply pump (not shown) for discharging the lubricating oil of the automobile engine. The other end is communicated with the inside of the bearing concave hole 7 and the bottoms of the vane grooves 11, 11, respectively.

In the case of the automobile vacuum pump of the present invention configured as described above, when the rotor 10 is rotated through the driven gear 9 and the drive shaft 3 by the drive gear provided in the automobile engine, the above-mentioned hermetically sealed The volumes of the spaces 16a, 16b, 16c change continuously. This volume change tends to increase at the intake port 17 portion and decrease at the exhaust port 18 portion. Therefore, if the intake port 17 is communicated with the vacuum tank, the inside of the vacuum tank can be made negative pressure. The air sucked from the vacuum tank is sent from the exhaust port 18 through the through hole 19 of the substrate 1 into the gear train of the automobile engine, and is discharged from the gear train to the atmosphere.

The lubricating oil sent from the oil supply passage 20 into the bearing recess 7 and the bottoms of the vane grooves 11, 11 is between the inner peripheral surface of the slide bearing 8b and the outer peripheral surface of the tip end portion of the drive shaft 3, and After lubricating the sliding portions such as the outer peripheral edges 12a of the vanes 12 and 12 and the inner peripheral surface 4a of the tubular portion 4, centrifugal force based on the rotation of the rotor 10 and the vanes 12 and 12 is applied. Then, the air is collected on the inner peripheral surface 4a and is sent into the gear train of the automobile engine together with the air sucked from the vacuum pump. The lubricating oil thus fed into the gear train is separated from the air and collected in the oil pan under the engine.

[0012]

[Problems to be solved by the device]

 However, in the conventional automotive vacuum pump configured and operating as described above, the rolling bearing 8a provided between the inner peripheral surface of the through hole 2 of the substrate 1 and the outer peripheral surface of the intermediate portion of the drive shaft 3 is provided. Lubrication is not always sufficient.

That is, the lubrication of the rolling bearing 8a is performed by the oil mist existing in the gear train of the automobile engine. However, this oil mist is not forcedly fed into the rolling bearing 8a, but is simply in the gear train. It is only expected that the oil mist floating in the inside of the bearing will enter into the rolling bearing 8a. Therefore, when the rotational speed of the drive shaft 3 is high, the rolling bearing 8a may be insufficiently lubricated.

The automobile vacuum pump of the present invention solves such a problem.

[0015]

[Means for Solving the Problems]

 The automobile vacuum pump of the present invention, like the conventional automobile vacuum pump described above, has a substrate fixed to the automobile engine, a through hole formed in the substrate, and a cylindrical inner peripheral surface. The bottom end of the cylindrical housing is fixed to the outer surface of the base plate and is closed from the center of the inner side surface of the closing plate part by closing the outer end opening of the cylindrical part with the closing plate part. A bearing concave hole formed at a position aligned with the hole, one drive shaft rotatably supported via a bearing inside the bearing concave hole and the through hole, and the inside of the drive shaft. At the end, the driven gear fixed to the portion protruding from the inner surface of the substrate, the rotor fixed to the inner portion of the cylindrical portion at the intermediate portion of the drive shaft, and the outer peripheral surface of the rotor. In the open state, a plurality of radial vane grooves and The width of the gap between the plurality of vanes fitted in the groove so as to be slidable in the radial direction and the outer peripheral surface of the rotor and the inner peripheral surface of the tubular portion as the rotor rotates In the widened portion, one end communicates with the air intake port communicating with this gap, and the other end communicates with the gap in the portion where the width of the gap narrows as the rotor rotates. And an exhaust port communicating with the inside of the housing, and provided in the closing plate of the housing, one end of which is used as the discharge port of the oil supply pump for discharging the lubricating oil of the automobile engine, and the other end of which is used in the bearing recess and The bottom of the vane groove is provided with an oil supply passage that communicates with each other.

Particularly, in the automobile vacuum pump according to the present invention, one end of the vacuum pump for an automobile is provided in the vicinity of the inner peripheral surface of the tubular portion and between the portion where the width of the above-mentioned gap is the narrowest and the exhaust port. The other end of the second oil supply passage, which is opened, is opened near the bearing inside the through hole.

[0017]

[Action]

 With the above-described automobile vacuum pump of the present invention, air itself is discharged from the inside of the vacuum tank or the like to make the inside of the vacuum tank negative pressure. The action itself is the same as that of the conventional automobile vacuum pump described above. It is similar to the case.

Particularly, in the case of the automobile vacuum pump of the present invention, a part of the lubricating oil collected on the inner peripheral surface of the cylindrical portion of the housing is caused by the centrifugal force based on the rotation of the rotor and the vane through the second oil supply passage. It is fed into a bearing provided inside the through hole. As a result, a sufficient amount of lubricating oil is sent to this bearing.

[0019]

【Example】

 1 and 2 show an embodiment of the present invention. The automotive vacuum pump of the present invention is characterized in that the base plate 1 is provided with the second oil supply passage 21, and other configurations and operations are the same as those of the conventional automotive vacuum pump described above, and therefore are equivalent. The same reference numerals are given to the portions to omit the duplicated description, and the characteristic portions of the present invention will be described below.

An inclined second oil supply passage 21 is formed in the substrate 1, and an inner end portion of the second oil supply passage 21 is provided inside a through hole 2 formed in the central portion of the substrate 1. The inner surface of the step portion 22 is opened. The outer end portion of the second oil supply passage 21 is an intermediate portion of the outer surface of the substrate 1, and when the substrate 1 and the housing 6 are combined, the outer peripheral portion of the inner peripheral surface 4a of the cylindrical portion 4 of the housing 6 is formed. It is opened in the facing part.

In the case of the automobile vacuum pump of the present invention having the second oil supply passage 21 as described above, the cylindrical portion forming the housing 6 by the centrifugal force based on the rotation of the rotor 10 and the vanes 12, 12 during operation. A part of the lubricating oil collected in the inner peripheral surface 4a of No. 4 is pushed into the second oil supply passage 21 opened in the inner peripheral surface 4a portion based on the hydraulic pressure increased by the centrifugal force. Then, the lubricating oil is sent to the rolling bearing 8a provided inside the through hole 2 at the center of the base plate 1 through the second oil supply passage 21. As a result, a sufficient amount of lubricating oil is fed into the rolling bearing 8a.

[0022]

[Effect of the device]

 Since the automobile vacuum pump of the present invention is constructed and operates as described above, the rolling bearing 8a is rotated even when the automobile vacuum pump rotates at a high speed because the automobile engine rotates at a high speed. Is sufficiently lubricated so that the rolling bearing 8a will not be seized or otherwise malfunctioned.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view showing a conventional structure.

[Explanation of symbols]

 1 substrate 2 through hole 3 drive shaft 4 cylindrical portion 4a inner peripheral surface 5 closing plate portion 6 housing 7 bearing concave hole 8a rolling bearing 8b sliding bearing 9 driven gear 10 rotor 10a outer peripheral surface 11 vane groove 12 vane 12a outer peripheral edge 13 convex portion 14 sliding plate 14a outer peripheral surface 15 gaps 16a, 16b, 16c hermetically sealed space 17 intake port 18 exhaust port 19 through hole 20 oil supply passage 21 second oil supply passage 22 step

Claims (1)

[Scope of utility model registration request] 1. A substrate fixed to an automobile engine surface, a through hole formed in the substrate, and an outer end opening of a cylindrical portion having a cylindrical inner peripheral surface is closed by a closing plate portion. And a bottomed cylindrical housing fixed to the outer surface of the substrate, and a position off the center of the inner surface of the closing plate portion,
A bearing concave hole formed at a position aligned with the through hole, a single drive shaft rotatably supported via a bearing inside the bearing concave hole and the through hole, and the drive shaft. An inner end portion of the driven gear fixed to a portion protruding from the inner surface of the substrate, a rotor fixed to an inner portion of the cylindrical portion at an intermediate portion of the drive shaft, and an outer peripheral surface of the rotor. In a state of opening, a plurality of vane grooves formed in the radial direction,
A plurality of vanes fitted in each vane groove so as to be slidable in the radial direction, and the width of the gap between the outer peripheral surface of the rotor and the inner peripheral surface of the cylindrical portion as the rotor rotates. In the portion where the gap spreads, and at the portion where the width of the gap narrows as the rotor rotates, one end communicates with the gap and the other end communicates with the automobile engine. And an exhaust port communicating with the inside of the housing, and a closing plate portion of the housing, one end of which is the discharge port of a fuel pump for discharging the lubricating oil of the automobile engine, and the other end is the bearing concave hole and In an automobile vacuum pump having an oil supply passage communicating with each other at the bottom of the vane groove, in the vicinity of the inner peripheral surface of the tubular portion, a portion where the width of the gap is narrowest and the exhaust port. A second feed with one end open at the The other end of the passage, a vacuum pump for a motor vehicle, characterized in that was opened in the vicinity of the inner bearing of the through hole.