JP2005163607A - Vane type vacuum pump and method for manufacturing rotor and coupling for vacuum pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a durable vane type vacuum pump by using a rotor and a coupling of which strength is increased. <P>SOLUTION: The pump 1 is provided with a main body 10 including a housing part 12, the rotor 3 rotatably arranged in the housing part 12, and the coupling 7 transmitting driving force from a driving part to the rotor 3. The rotor 3 is provided with a vane support part 31 arranged in the housing part 12, a shaft part 32 rotatably supported by the body main body part 10, a coupling fitting part 33 fitting with the coupling 7 and a vane groove 34 slidably supporting a vane 5. The coupling 7 fabricated in one piece by precision cold forging means includes a rotor support part 71 and a projection part 72 including a pair of projecting pieces and is fabricated by precision cold forging operation in one piece. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vane type vacuum pump that includes a rotor equipped with a vane, and the rotor is rotationally driven from a driving unit via a coupling, and a rotor and a method of manufacturing the coupling in the vane type vacuum pump.

  The vane vacuum pump is used, for example, as a negative pressure generator for a brake booster of a vehicle equipped with a diesel engine of an automobile. As shown in Patent Document 1, the drive is transmitted to the housing and the camshaft of the engine via a coupling. And a rotor that is rotatably arranged in the housing, and a vane that is slidably arranged in the vane groove of the rotor. The housing has a sliding surface with an inner surface substantially elliptical, and the vane is a slider that is mounted on both ends of the housing by rotating around a position that is eccentric with respect to the center position of the sliding surface of the housing. Touch the elliptical sliding surface. Further, the housing has an air inlet and a discharge port, and the air introduced into the housing from the air inlet is compressed and expanded by rotating the vane together with the rotor through the coupling by the rotation of driving means such as a camshaft. While being discharged from the discharge port via the discharge port. As a result, a negative pressure is generated to constitute a negative pressure generating device.

The rotor is originally formed with a vane support portion housed in the housing and a shaft portion that is rotatably fitted to the housing, and is formed in two so that the vane support portion and the shaft portion are fitted by a spline. It had been. However, forming with two bodies not only increases the number of parts and increases the cost, but also has a fitting gap, so it is easy to break if stress is concentrated on the fitting part and overload is applied. Accordingly, it has become necessary to integrally form the vane support portion and the shaft portion. When formed integrally, since it has good moldability and contains oil and wear resistance, it is generally performed integrally with sintered metal.
Japanese Patent Laid-Open No. 10-47273 (refer to pages 3 to 4 and FIG. 1)

  For example, a rotor of a conventional vane type vacuum pump including the above-described Patent Document 1 includes a vane support portion housed in a housing and a shaft portion formed so as to be rotatable with respect to the housing. Are integrally formed. Sintered metal is formed as a strong bonded body by heating the powder to the melting point or below or to the extent of partial melting. It is complex because it has good moldability and is porous and oil-containing. In general, the strength is not so strong compared to the smelted material, but the thickness is increased, for example, in order to reduce the stress in the portion where overload is applied. Such treatment was necessary.

  For example, in the case of the above rotor, as shown in FIG. 8, the rotor 3 is formed in three stages of a vane support portion 31, a shaft portion 32, and a coupling fitting portion 33, and the vane groove portion 34 is formed in the vane support portion 31. Since the rotor 3 rotates with respect to the housing, stress is applied to the root portion of the shaft portion 32, the root portion of the coupling fitting portion 33, and the vane groove portion 34. Long-term use raises concerns about fatigue failure. In addition, since the density of the sintered body cannot be made uniform due to the porosity, it is necessary to take a lot of machining allowance in the shaft portion 32 and the coupling fitting portion 33. That is, as shown in FIG. 8, in the outer shape formed of sintered metal, the machining allowance W1 of the medium-diameter shaft portion 32 and the small-diameter coupling support portion 33 has the same diameter as the outer shape of the vane support portion 31. The columnar shape has no step, which increases the number of processing steps and increases the cost.

  Also, in the case of the coupling, since it is formed of sintered metal like the rotor, the strength is low, and there is a concern of fatigue failure especially in the rotor fitting portion in long-term use. .

  Therefore, it has been desired to form the rotor and the coupling in the vane type vacuum pump by alloy steel instead of sintered metal. However, conventionally, even if alloy steel is used, a processing margin is required, so that the strength of the stepped portion cut by the cutting tool is reduced, and a countermeasure for preventing the strength reduction has been desired.

SUMMARY OF THE INVENTION The present invention solves the above-described problems, and aims to use a rotor and a coupling having improved strength in a vane type vacuum pump. In this invention, the housing, the rotor housed in the housing and rotatably supported by the housing, and the slidably disposed in the vane groove formed in the rotor, the inner peripheral surface of the housing is slid. A vane that contacts the rotor, and a coupling that is rotatably disposed on the rotor together with the rotor and that transmits a drive from a driving member to the rotor, and is provided between an end surface in the thrust direction of the rotor and a side surface of the housing A vane type vacuum pump configured to supply lubricating oil into the housing from
The rotor has a vane support portion housed in the housing, a shaft portion rotatably fitted to the housing, and a coupling fitting portion fitted to the coupling. It is formed by forging means.

According to a second aspect of the present invention, the housing, the rotor housed in the housing and rotatably supported by the housing, and the housing slidably disposed in the vane groove formed in the rotor. A vane that is in sliding contact with the inner peripheral surface of the rotor, and a coupling that is rotatably arranged with the rotor on the rotor and that transmits a drive from a driving member to the rotor, and an end surface in the thrust direction of the rotor, A vane type vacuum pump configured to supply lubricating oil into the housing from between the side surfaces of the housing;
The coupling has a rotor fitting portion that fits with the rotor and a protruding portion that connects with the drive member, and is formed by precision forging means.

Furthermore, in the invention according to claim 3, the housing, the rotor housed in the housing and rotatably supported by the housing, and the housing slidably disposed in the vane groove formed in the rotor. A vane that is in sliding contact with the inner peripheral surface of the rotor, and a coupling that is rotatably arranged with the rotor on the rotor and that transmits a drive from a driving member to the rotor, and an end surface in the thrust direction of the rotor, A method of manufacturing a rotor in a vane type vacuum pump configured to supply lubricating oil into the housing from between the side surfaces of the housing,
The rotor has a vane support portion housed in the housing, a shaft portion rotatably fitted to the housing, and a coupling fitting portion fitted to the coupling. In addition to being formed by forging means, at least the connecting portion between the coupling fitting portion and the shaft portion and the vane groove portion are formed without machining.

According to a fourth aspect of the present invention, the housing, the rotor housed in the housing and rotatably supported by the housing, and the housing slidably disposed in the vane groove formed in the rotor. A vane that is in sliding contact with the inner peripheral surface of the rotor, and a coupling that is rotatably arranged with the rotor on the rotor and that transmits a drive from a driving member to the rotor, and an end surface in the thrust direction of the rotor, A method of manufacturing a coupling in a vane type vacuum pump configured to supply lubricating oil into the housing from between the side surfaces of the housing,
The coupling has a rotor fitting portion that fits with the rotor, and a protruding portion that connects with the drive member, and is formed by precision forging means, and at least the rotor fitting portion and the protruding portion The connecting part is formed without machining allowance.

According to a fifth aspect of the invention, the housing, the rotor housed in the housing and rotatably supported by the housing, and the housing slidably disposed in the vane groove formed in the rotor. A vane that is in sliding contact with the inner peripheral surface of the rotor, and a coupling that is rotatably arranged with the rotor on the rotor and that transmits a drive from a driving member to the rotor, and an end surface in the thrust direction of the rotor, A vane type vacuum pump configured to supply lubricating oil into the housing from between the side surfaces of the housing;
The rotor has a vane support portion housed in the housing, a shaft portion rotatably fitted to the housing, and a coupling fitting portion fitted to the coupling. Formed by forging means, and the coupling has a rotor fitting portion that fits with the rotor and a protruding portion that connects with the drive member, and is formed by precision forging means,
The rotor formed by the cold forging means forms at least a connecting portion between the coupling fitting portion and the shaft portion and the vane groove portion without machining, and is formed by the precision cold forging means. The coupling is characterized in that it forms at least a connecting portion with the rotor-fitting thick protrusion without machining.

  According to the first aspect of the present invention, for example, when the rotor rotates through the coupling by driving from the driving means of the engine, the vane slides in the vane groove of the rotor and rotates while sliding on the inner peripheral surface of the housing. Is done. The load applied to the rotor by the operation of the vane type vacuum pump is applied to the root portion of the coupling fitting portion of the rotor when the rotor is rotated or stopped. By forming the rotor with precision forging means, it is possible to maintain the surface roughness without forming a machining margin at a portion where the stress is concentrated in the coupling fitting portion or the vane groove portion, thereby improving the strength of the rotor itself. Can be improved.

  Therefore, as compared with the case where the rotor is integrally formed of sintered metal as in the prior art, the rotor can have sufficient strength, so that it can sufficiently withstand stress concentration. Further, since the machining margin can be reduced, the machining time can be reduced and the cost can be reduced.

  According to the second aspect of the present invention, for example, when the rotor rotates through the coupling by driving from the driving means of the engine, the vane slides in the vane groove of the rotor and rotates while sliding on the inner peripheral surface of the housing. Is done. The load applied to the coupling by the operation of the vane type vacuum pump is applied to the joint portion between the rotor fitting portion and the protruding piece portion in the coupling when the coupling is rotated or stopped. By forming the coupling by precision forging means, it is possible to maintain surface roughness without forming a margin for machining in the portion where the stress is concentrated in the rotor fitting part and the protruding part, thereby increasing the strength of the coupling itself. Can be improved.

  Accordingly, since the coupling can have sufficient strength as compared with the case where the coupling is integrally formed of sintered metal as in the prior art, it is possible to maintain sufficient strength even when stress concentration is applied. Further, since the machining margin can be reduced, the machining time can be reduced and the cost can be reduced.

  According to the third aspect of the present invention, for example, when the rotor rotates through the coupling by driving from the driving means of the engine, the vane slides in the vane groove of the rotor and rotates while sliding on the inner peripheral surface of the housing. Is done. The load applied to the rotor by the operation of the vane type vacuum pump is applied to the root portion of the coupling coupling portion of the rotor and the shaft portion connecting portion of the vane groove portion when the rotor is rotated or stopped. By forming the rotor with precision forging means, it is possible to maintain the surface roughness without forming a machining margin at a portion where the stress is concentrated in the coupling fitting portion or the vane groove portion, thereby improving the strength of the rotor itself. Can be improved.

  Therefore, as compared with the case where the rotor is integrally formed of sintered metal as in the prior art, the rotor can have sufficient strength, so that it can sufficiently withstand stress concentration. Further, since the machining margin can be reduced, the machining time can be reduced and the cost can be reduced.

  According to the fourth aspect of the present invention, for example, when the rotor rotates through the coupling by driving from the driving means of the engine, the vane slides in the vane groove of the rotor and rotates while sliding on the inner peripheral surface of the housing. Is done. The load applied to the coupling by the operation of the vane type vacuum pump is applied to the joint portion between the rotor fitting portion and the protruding portion of the coupling when the coupling is rotated or stopped. By forming the coupling with precision forging means, it is possible to maintain the surface roughness without forming a machining margin at the portion where the stress concentration is applied to the rotor fitting portion and the protruding piece portion, and thereby the coupling itself. Strength can be improved. It is also advantageous for the wear of the camshaft fitted on the other side of the coupling.

  Therefore, since the coupling can have sufficient strength as compared with the case where the coupling is integrally formed of a sintered metal as in the prior art, it can sufficiently withstand stress concentration. Further, since the machining margin can be reduced, the machining time can be reduced and the cost can be reduced.

  According to the fifth aspect of the present invention, for example, when the rotor rotates through the coupling by driving from the driving means of the engine, the vane slides in the vane groove of the rotor and rotates while sliding on the inner peripheral surface of the housing. Is done. The load applied to the rotor and coupling due to the operation of the vane vacuum pump is applied to the rotor coupling at the root part of the coupling coupling part of the rotor, the shaft coupling part of the vane groove part, and the coupling of the rotor when the rotor is stopped. The maximum stress is applied to the connecting portion between the portion and the protruding portion. By forming the rotor and coupling by precision forging means, it is possible to apply stress concentration at the coupling fitting part of the rotor and the vane groove part, and at the part where stress concentration at the rotor fitting part of the coupling and the protrusion part is applied. The surface roughness can be maintained without forming a machining margin, whereby the strength of the rotor and the coupling itself can be improved.

  Therefore, as compared with the conventional case in which the rotor and the coupling are integrally formed of sintered metal, the rotor and the coupling can have sufficient strength, so that they can sufficiently withstand stress concentration. Further, since the machining margin can be reduced, the machining time can be reduced and the cost can be reduced.

  Next, a vane type vacuum pump (hereinafter referred to as a pump) according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a front sectional view showing the rotor 3 of the pump 1, and FIG. 2 is a side sectional view of the pump 1. As shown in FIGS. 1 and 2, the pump 1 includes a body main body 10, a rotor 3 housed in the body main body 10, and a vane 5 disposed on the rotor 3 and in sliding contact with the inside of the body main body 10. The rotor 3 is configured to be fitted with a coupling 7 for transmitting the drive from the drive means 9 such as an engine camshaft to the rotor 3.

  The body body 10 includes a bracket portion 11 for mounting the pump 1, a housing portion 12 that accommodates the rotor 3, is formed in a substantially elliptic cylindrical shape and has a sliding surface 121 on the inner peripheral surface, and a shaft portion of the rotor 3. And a cover 14 that is attached to the opened portion of the front surface of the housing portion 12. Further, an exhaust port 15 is formed in a curved long hole shape on the bottom surface of the housing portion 12 (the surface opposite to the surface on which the cover 14 is attached facing the thrust side end surface of the rotor 3). Further, an intake port 16 is formed in a part of the sliding surface 121 of the housing portion 12, and an intake port 17 is attached to the intake port 16.

  As shown in FIG. 3, the bracket portion 11 of the body body 10 is formed to extend from the housing portion 12 in both directions between the housing portion 12 and the bearing portion 13, and the pump 1 is attached to both ends. An attachment hole 111 for attaching to the member is formed.

  As described above, the housing portion 12 is formed in a substantially oval cylindrical shape, has a substantially oval sliding surface 121 on the inner peripheral surface, and is mounted on the tip of the vane 5 that rotates together with the rotor 3. Comes into sliding contact with the sliding surface 121. The center of the rotating rotor 3 is in an eccentric position with respect to the center of the sliding surface 121, and a part of the rotor 3 is extremely close to one end of the sliding surface 121 (hereinafter referred to as a compression chamber / expansion chamber partition). (Referred to as position P1).

  In addition, the bearing portion 13 of the body main body 10 has an oil reservoir 131 and an oil guide groove 132 formed in part on the inner peripheral surface.

  On the other hand, as shown in FIG. 2, the rotor 3 protrudes from the body body 11 to the outside by a vane support portion 31 housed in the housing portion 12, a shaft portion 32 rotatably supported by the housing portion 12. It has a coupling fitting part 33 that can be fitted to the coupling 7, and is arranged so as to be rotatable with respect to the housing part 12. In addition, a vane groove 34 in which the vane 5 slides is formed in the vane support portion 31 in a direction orthogonal to the axis of the rotor 3. Further, the coupling fitting portion 33 is formed with an oil supply hole 331 formed along the axial direction from the end surface on the coupling fitting portion 33 side and orthogonally from the tip of the oil supply vertical hole 331. The oil supplied from the oil supply pipe 8 piped on the coupling 7 side fitted to the rotor 3 is supplied into the housing portion 12 of the body body 1.

  Between both end portions of the vane support portion 31 of the rotor 3 in the thrust direction, that is, between both side surface portions of the rotor 3 facing the inner peripheral side surface portion of the housing portion 12 of the body body 10 and both inner peripheral side surface portions of the housing portion 12. A small gap through which oil is passed is formed to guide and guide the oil supplied from the oil supply pipe 8 to be supplied into the housing 12 from the oil guide groove 132 formed in the bearing portion 13 of the body body 10. . In addition, as shown in FIG. 6, the coupling fitting part 33 forms the both end surfaces in one direction in planar shape. Thereby, the rotational torque of the coupling 7 to be fitted can be easily received.

  As shown in FIGS. 2 and 4, the vane 5 is slidably mounted in the vane groove 34 of the rotor 3 and is formed in a rectangular plate shape so as to face the entire width direction of the sliding surface 121 of the housing 12. In addition, the slider 51 is disposed on the surface facing the sliding surface 121. The slider 51 has a sliding contact surface that is opposed to the entire width direction of the sliding surface 121 and has an arcuate cross section so as to be in sliding contact with the sliding surface 121. The slider 51 is inserted into the grooves 52 and 52 formed at both ends of the vane 5 and attached to the vane 5, and slides so that the pair of sliders 51 and 51 slide on the sliding surface 121 by the rotation of the rotor 3. Will be.

  At this time, the rotor 3 rotates about a position eccentric with respect to the center of the sliding surface 121, and the pair of sliders 51 and 51 come into contact with the sliding surface 121 at any rotational position of the rotor 3. Therefore, the vane 5 slides in the vane groove 34 of the rotor 3.

  Furthermore, when the rotor 3 rotates in the sliding surface 121, the interior of the housing 12 is divided into an expansion chamber 122 and a compression chamber 123. As shown in FIG. 1, the air supplied from the intake port 16 at an angle at which the vane 5 indicates the horizontal direction flows above the vane 5, and when the rotor 3 rotates counterclockwise in FIG. 1, Since the air expands above 5, an expansion chamber 122 is formed. Below the vane 5, the rotor 3 and the inner peripheral surface of the housing 12 are in close proximity and substantially in contact with each other (compression chamber / The chamber on the left side from the expansion chamber partition position P1) is formed as the compression chamber 123. The exhaust port 15 is formed in the compression chamber 123 formed at the horizontal angle of the vane 5.

  In the compression chamber 123, a room symmetrical to the compression chamber / expansion chamber partition position P1 is an expansion start chamber 124, and air starts to expand from this room.

  The rotor 3 is integrally formed with a vane support portion 31 that forms the vane groove 34, a shaft portion 32, and a coupling support portion 33 by precise cold forging means made of alloy steel. That is, in the precise cold forging means, as shown in FIG. 5, the rotor 3 is formed in a shape close to the final product, leaving a part of the machining margin. In FIG. 5, the hatched portion indicates the machining margin W, and the rotor 3 has the shape of the portion indicated by the solid line portion of the outer shape when formed by the precision cold forging means, and the vane support portion 31 and the shaft portion. A machining allowance W is formed on the outer peripheral surface of 32 and the left end surface of the vane support portion 31. The machining margin W in the shaft portion 32 includes a large-diameter thick portion that extends from the outer shape including the machining margin of the vane support portion 31 and widens the thickness portion to be machined, and a small-diameter wall that is formed with a predetermined machining margin. It is formed in a step shape with the thick part.

  The end surface of the shaft portion 32 (the right end surface of the shaft portion 32 in FIG. 5), the outer peripheral surface and the end surface of the coupling engaging portion 33 (the right end surface of the coupling fitting portion 33 in FIG. 5), and the vane groove 34 are machined W. Is not formed. Since these surfaces are formed so as to maintain a surface roughness of about 3.2 Rz in a pure state by this precise cold forging means, the strength is not lowered by processing.

  Accordingly, since the arc surface at the step portion between the shaft portion 32 and the coupling fitting portion 33 can be formed without being processed, the tissue flow is dense and the flow is not cut. Is not reduced. In addition, since the machining margin is small, the machining time can be reduced and the machining cost can be reduced.

  As shown in FIGS. 2 and 7, the coupling 7 that fits into the coupling fitting portion 33 of the rotor 3 includes a rotor fitting portion 71 that fits into the coupling fitting portion 33 of the rotor 3, and a camshaft. 9 and a projecting portion 72 that can be inserted into a groove formed at the end portion. The rotor fitting portion 71 is formed in a disc shape, and a fitting hole 73 having a plane portion 731 substantially the same shape as the coupling fitting portion 33 of the rotor 3 on both sides is formed in the inside of the camshaft 9. Rotational torque is transmitted to the rotor 3. The protruding portion 72 has a pair of protruding pieces 721 and 721 so as to face each other with the fitting hole 73 therebetween, and is formed to be connectable to the camshaft 9.

  And the coupling 7 is integrally formed by the precision cold forging means by alloy steel like the rotor 3. In other words, all the external parts of the coupling 7 are formed as final dimensions by this precise cold forging means.

  That is, the end surface of the rotor fitting portion 71 (the right end surface of the rotor fitting portion 71 in FIG. 2), the end surfaces of the protruding pieces 721 and 721 (the left end surfaces of the protruding pieces 721 and 721 in FIG. 2), the fitting holes 73 and No machining margin W is formed on the inner peripheral surfaces of the projecting pieces 721 and 721 facing each other. Since these surfaces are formed so as to maintain a surface roughness of about 3.2 Rz in a pure state by this precise cold forging means, the strength is not lowered by processing. Accordingly, since the arc surface at the stepped portion between the fitting hole 73 and the pair of protruding pieces 721 and 721 can be formed without being processed, the tissue flow is dense and the flow is not cut. There is no reduction in strength. In addition, since the machining margin is small, the machining time can be reduced and the machining cost can be reduced.

  Next, the operation of the pump 1 configured as described above will be described.

  When the rotation of the camshaft 9 is transmitted from the coupling 7 to the rotor 3 by the rotation of the camshaft 9, the rotation of the rotor 3 that rotates about the position eccentric with respect to the center position of the sliding surface 121 of the housing portion 12 is performed. Along with the counterclockwise rotation, the vane 5 rotates counterclockwise while sliding in the vane groove 34 of the rotor 3. That is, one of the sliders 51 and 51 mounted on both ends of the vane 5 jumps out of the rotor 3 due to inertia, and the other is drawn into the rotor 3 so that the vane 5 slides in the vane groove 34 of the rotor 3. As a result, the pair of sliders 51 and 51 are in sliding contact with each other along the sliding surface 121 of the housing portion 12.

  On the other hand, since the volume of each chamber changes as the vane 5 rotates in the housing portion 12, the air supplied from the intake port 16 flows into the expansion chamber 122. The air that has flowed into the expansion chamber 122 is gradually sent to the compression chamber 123 by the rotating vane 5, approaches the compression chamber / expansion chamber partition position P <b> 1, and is exhausted from the exhaust port 15 when compressed in the compression chamber 123. . When the compression chamber / expansion chamber partition position P1 is exceeded, the remaining air is moved to the expansion start chamber 124 to start expansion, and is further sent to the expansion chamber 122 together with air newly supplied from the intake port 16. The inside of the housing 12 is circulated.

  Therefore, when the rotor 3 is continuously rotated, the air supplied into the housing 12 is repeatedly expanded and compressed to be exhausted from the exhaust port, thereby forming a negative pressure generating device.

  At this time, when the rotational torque of the camshaft 9 is transmitted to the rotor 3, torque is applied to the coupling portion between the coupling 7 and the rotor 3, and the coupling portion between the rotor 3 and the vane 5 to generate stress concentration. Let This stress concentration is applied at the maximum to the connection portion between the coupling fitting portion 31 and the shaft portion 32 in the rotor 3 or the connection portion between the rotor fitting portion 71 and the protrusion 72 of the coupling 7.

  However, as described above, the rotor 3 and the coupling 7 of the embodiment are made of alloy steel and manufactured by precision cold forging means, and the surface roughness is maintained at 3.2 Rz. Therefore, it is connected in an innocent state without any processing. Therefore, the strength can be improved, and even the stress concentration can be sufficiently resisted. In addition, the machining time can be reduced and the cost can be reduced as much as the machining is not performed.

It is front sectional drawing of the vane type vacuum pump in one form of this invention. FIG. It is the same rear view. It is IV-IV sectional drawing in FIG. It is explanatory drawing which shows the machining margin of the rotor in FIG. It is a side view which shows the rotor in FIG. It is a perspective view which shows the coupling in FIG. It is explanatory drawing which shows the machining margin in the conventional rotor.

Explanation of symbols

1. Vane type vacuum pump (pump)
3, rotor 5, vane 7, coupling 10, body main body 12, housing part 121, sliding surface 13, bearing part 31, vane support part 32, shaft part 33, coupling fitting part 34, vane groove 51, slider 71, rotor support part 72, protrusion part 721, protrusion piece

Claims (5)

A housing, a rotor housed in the housing and rotatably supported by the housing, and a vane slidably disposed in a vane groove formed in the rotor and slidably contacting an inner peripheral surface of the housing; A coupling disposed on the rotor to be rotatable together with the rotor and transmitting drive from a driving member to the rotor, and between the end surface of the rotor in the thrust direction and the side surface of the housing. A vane vacuum pump configured to supply lubricating oil to
The rotor has a vane support portion housed in the housing, a shaft portion rotatably fitted to the housing, and a coupling fitting portion fitted to the coupling. A vane type vacuum pump characterized by being formed by forging means. A housing, a rotor housed in the housing and rotatably supported by the housing, and a vane slidably disposed in a vane groove formed in the rotor and slidably contacting an inner peripheral surface of the housing; A coupling disposed on the rotor to be rotatable together with the rotor and transmitting drive from a driving member to the rotor, and between the end surface of the rotor in the thrust direction and the side surface of the housing. A vane vacuum pump configured to supply lubricating oil to
The vane type vacuum pump, wherein the coupling has a rotor fitting portion that fits with the rotor, and a protruding portion that connects with the drive member, and is formed by precision forging means. A housing, a rotor housed in the housing and rotatably supported by the housing, and a vane slidably disposed in a vane groove formed in the rotor and slidably contacting an inner peripheral surface of the housing; A coupling disposed on the rotor to be rotatable together with the rotor and transmitting drive from a driving member to the rotor, and between the end surface of the rotor in the thrust direction and the side surface of the housing. A method of manufacturing a rotor in a vane type vacuum pump configured to supply lubricating oil to
The rotor has a vane support portion housed in the housing, a shaft portion rotatably fitted to the housing, and a coupling fitting portion fitted to the coupling. A method for manufacturing a rotor in a vane type vacuum pump, wherein the rotor is formed by forging means, and at least a connecting portion between the coupling fitting portion and the shaft portion and the vane groove portion are formed without machining. A housing, a rotor housed in the housing and rotatably supported by the housing, a vane that is movably disposed in a vane groove formed in the rotor and slidably contacts an inner peripheral surface of the housing; A coupling disposed on the rotor to be rotatable together with the rotor and transmitting drive from a driving member to the rotor, and between the end surface of the rotor in the thrust direction and the side surface of the housing. A method of manufacturing a coupling in a vane type vacuum pump configured to supply lubricating oil to
The coupling has a rotor fitting portion that fits with the rotor, and a protruding portion that connects with the drive member, and is formed by precision forging means, and at least the rotor fitting portion and the protruding portion The coupling manufacturing method in the vane type vacuum pump is characterized in that the connecting portion is formed without machining allowance. A housing, a rotor housed in the housing and rotatably supported by the housing, and a vane slidably disposed in a vane groove formed in the rotor and slidably contacting an inner peripheral surface of the housing; A coupling disposed on the rotor so as to be rotatable together with the rotor and transmitting a drive from a driving member to the rotor, and the housing from between a thrust end surface of the rotor and a side surface of the housing. A vane type vacuum pump configured to supply lubricating oil therein,
The forge includes a vane support portion housed in the housing, a shaft portion rotatably fitted to the housing, and a coupling fitting portion fitted to the coupling. The coupling is formed by precision forging means having a rotor fitting portion that fits with the rotor and a protruding portion that connects with the drive member,
The rotor formed by the precision forging means forms at least a connecting portion between the coupling fitting portion and the shaft portion and the vane groove portion without machining, and the coupling formed by the precision forging means. However, the vane type vacuum pump is characterized in that at least a connecting portion between the rotor fitting portion and the protruding portion is formed without machining.

Images