JPH09184489A - Vane pump and assembly method of vane pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatize assembly of a vane pump. SOLUTION: This pump is furnished with a cam ring storing a rotor connected to a drive shaft and a vane provided free to go in and out on the rotor free to rotate, a body to axially support the drive shaft and storing the cam ring 30 and a side plate interposed between the body and an end surface of the cam ring 30, and at least one set of dowel pins is axis symmetrically and erectively provided on the side plate. Furthermore, an outer periphery of the cam ring 30 is formed circular, a cylindrical pin hole 40 and an oval pin hole 41 to insert each of these pins through them are formed, a tapered part 30C is formed on a marginal part of an end surface 30A where the cam ring 30 makes contact with the side plate and a tapered part 40A is formed on an opening margin of the cylindrical pin hole 40A opened on the other end surface 30B of this cam ring 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vane pump cam ring, and more particularly to a vane pump most suitable as a hydraulic power source for a vehicle power steering device or the like, and more particularly to a vane pump using a cam ring that enables automatic discriminative assembly by a machine. .

[0002]

2. Description of the Related Art A vehicle such as an automobile is equipped with a power steering device using hydraulic pressure, and a vane pump as shown in FIGS. 16 and 17 has been conventionally used as a hydraulic pressure supply source.

This vane pump has a cam ring 3 which constitutes a pump cartridge 3'in a body 107.
0 ', rotor 31 and vane 32 are installed,
The cam ring 30 ′ and the rotor 31 are arranged between the cover 106 fastened to the open end surface of the body 107 and the side plate 108 fixedly installed inside the body 107.

The rotor 31 is connected to a drive shaft 50 'penetrating the body 107, and a pulley (not shown) connected to an engine is connected to the base end of the drive shaft 50', so that the rotor 31 is connected to the cam ring 30 '. It rotates with the vanes 32 that are radially arranged on the inner circumference and can freely move in and out. Drive shaft 5
0'is rotatably supported by a bearing 120 provided inside the body 107 and a bearing 121 provided on the cover 106.

[0005] Inside the body 107 is a side plate 1
08, a high-pressure chamber 101 defined between the high-pressure chamber 101 and the high-pressure chamber 10
1, a passage 111 that connects the valve hole of the flow control valve 4 to each other,
A low-pressure communication passage 109 is formed for returning excess hydraulic oil to the suction region of the pump cartridge 3 ′ by the suction connector 105 and the flow control valve 4 which communicate with the outside of the body 107, and through a communication hole of the side plate 108. The hydraulic fluid pressure-fed from the pump cartridge 3 ′ to the high-pressure chamber 101 is supplied to the power steering device (not shown) through the passage 111 and the flow control valve 4 at a required flow rate.

On the other hand, the surplus flow rate from the flow rate control valve 4 and the hydraulic oil from the suction connector 105 flow into the inside of the cover 106 through the low pressure communication passage 109, and are bent and formed in the cover 106 so as to be bifurcated. Forked passage 10
It is sent via 2, 102 to the suction area of the pump cartridge 3 ′.

As shown in FIG. 18, a cam ring 30 'of such a pump cartridge 3'has an outer circumference formed into an elliptical shape having a plurality of curved surfaces and an inner circumference formed into a predetermined cam shape. The outer circumference of the cam ring 30 ′ is engaged and positioned with the inner circumference of the recess of the body 107.

In the assembly process of the vane pump, the pair of pin holes 140 formed through the cam ring 30 'are engaged with the pair of dowel pins 142 fixedly fixed to the side plate 108, and then the cam ring 30' and the side plate. 108 is accommodated at a predetermined position inside the body 107.

A cam ring of a vane pump as disclosed in Japanese Utility Model Publication No. 62-15506 is also known, and a chamfered portion is formed on a part of the outer circumference of the cam ring so that the working oil smoothly flows to the inner circumference of the cam ring. It is intended to prevent the occurrence of cavitation and the like by improving the pump efficiency.

[0010]

However, in the above-mentioned conventional example, since the outer circumference of the cam ring 30 'is formed into an elliptical shape having a plurality of curved surfaces, it is difficult to form the cam ring 30', which causes an increase in manufacturing cost. Further, assembling the cam ring 30 'and the side plate 108 and assembling into the body 107 are performed manually because it is difficult to automate the positioning of the pin hole 140 and the dowel pin 142, which realizes labor saving and reduction in the number of assembling steps. I can't
It was one of the factors that hindered the reduction of manufacturing costs.

Therefore, the present invention has been made in view of the above problems, and provides a cam ring for a vane pump capable of automating the assembly process of the vane pump, improving productivity, and reducing the manufacturing cost. With the goal.

[0012]

According to a first aspect of the present invention, there is provided a cam ring for rotatably receiving a rotor connected to a drive shaft, a vane provided to be able to move in and out of the rotor, and a cam ring for supporting the drive shaft. , A body that accommodates this cam ring,
In a vane pump including a side plate interposed between the body and an end surface of a cam ring, and a cover that is in contact with the other end surface of the cam ring and is coupled to the body, the side plate has at least 1 axially symmetrical portion. A pair of dowel pins are erected, the outer periphery of the cam ring is formed in a circular shape, a plurality of through holes for inserting these pins are formed, and a tapered portion is formed on the peripheral edge of the end face where the cam ring contacts the side plate. on the other hand,
In one of the through holes opened on the other end surface of the cam ring, a tapered portion is formed on the peripheral edge of the opening so that the through hole serves as a reference hole.

According to a second aspect of the present invention, a rotor that is coupled to a drive shaft, a cam ring that rotatably accommodates a vane that can be inserted into and removed from the rotor, a drive shaft, and the cam ring are provided. A housing body, a side plate interposed between the body and an end surface of a circular cam ring, a cover that abuts on the other end surface of the cam ring and is joined to the body, and is axially symmetrical to the side plate. At least one set of dowel pins erected on the cam ring, a plurality of through holes formed in the cam ring for inserting these pins, and a taper portion formed on the peripheral edge of the end face of the cam ring that abuts the side plate. , A taper formed on the peripheral edge of the opening of the cam ring so that one of the through holes opened at the end face which comes into contact with the cover of the cam ring serves as a reference hole. In a method for assembling a vane pump, which is equipped with a cam ring and is inserted into a dowel pin and is automatically assembled to a side plate, a circular cam ring placed on a predetermined plane is engaged with a taper portion of a peripheral edge of the cam ring. A step of bringing a jig having a possible circular recess into contact with the end face of the cam ring, and detecting the height from the plane to a predetermined position of the jig, and if this height is less than a predetermined value A step of determining the end face as a surface, a step of moving and placing a circular cam ring with the end face down on a table provided with a predetermined plane, and an axial displacement at a position that can face the through hole of the cam ring. A step of rotating a possible detection pin relative to the table while abutting the end surface above the cam ring,
A step of detecting a displacement amount of the detection pin in the axial direction, and determining a mounting reference position of the cam ring at a position where the displacement amount is maximum.

According to a third aspect of the present invention, a rotor that is coupled to a drive shaft, a cam ring that rotatably accommodates a vane that can be moved in and out of the rotor, and a shaft that supports the drive shaft are provided. A housing body, a side plate interposed between the body and an end surface of a circular cam ring, a cover that abuts on the other end surface of the cam ring and is joined to the body, and is axially symmetrical to the side plate. At least one set of dowel pins erected on the cam ring, a plurality of through holes formed in the cam ring and through which the pins are inserted, and one of the through holes opened on the end face that abuts the cover of the cam ring. In order to ensure that the cam ring is inserted into the dowel pin, the side plate is automatically assembled. In a method for assembling a vane pump according to the above, a step of determining the end surface on the side facing the cover on a table having a predetermined flat surface, placing the circular cam ring with the end surface facing upward, and facing the through hole of the cam ring. A step of rotating the detection pin displaceable in the axial direction at a possible position relative to the table while contacting the end face of the cam ring, and detecting the axial displacement of the detection pin Determining the mounting reference position of the cam ring at the position where the amount is maximum.

[0015]

Therefore, in the first aspect of the invention, in the assembly process of the vane pump, the through hole of the cam ring is inserted into the dowel pin erected on the side plate, and the rotor and the vane are assembled to the inner circumference of the cam ring. Since the tapered portion is formed on the peripheral edge of the end surface that abuts the side plate, the front and back of the cam ring can be easily discriminated, and a plurality of through holes are opened in the end surface of the cam ring that abuts the cover. However, since a tapered portion was formed on the periphery of one of the openings and used as a reference hole, positioning when inserting the cam ring into the dowel pin can be performed quickly and easily, and a circular cam ring on the assembly line If a jig for determining the end surface is provided, automation of the determination of the front and back of the cam ring can be realized. By deploying the detection pins or the like which abuts the end surface of the cover side while rotating the circular cam ring,
When the cam ring is assembled to the dowel pin, the position where the displacement of the detection pin is maximum can be automatically detected as the reference hole position by inserting the detection pin into the taper part of the opening periphery, and at this position the cam ring The dowel pin can be inserted into the dowel pin, and therefore, the end face of the cam ring on the assembly side can be automatically determined, and a predetermined position around the circumference of the cam ring can be automatically detected to allow the dowel pin to be inserted, and the assembly process The automation of can be promoted.

According to a second aspect of the present invention, a circular cam ring placed on a predetermined plane is brought into contact with an end face of the cam ring with a jig having a circular concave portion that can be engaged with the tapered portion of the cam ring. , The height from the plane to the predetermined position of the jig is detected, and if this height is less than the predetermined value, it can be determined that the end face is the surface, and it should be the front side of the cam ring having the tapered portion. The end face can be easily identified, and if the end face is detected, it can be assembled on the side plate side. Further, the cam ring circumferential positioning of the cam ring can also be done by mounting the circular cam ring on a predetermined plane. Since a detection pin that comes into contact with the end face while rotating is provided, the position where the displacement amount of the pin is maximum by inserting the detection pin into the taper part of the opening peripheral edge of the through hole used as the reference hole is the reference hole position. It is detected as, it is possible to insert the cam ring dowel pins, therefore, by performing these steps on all mechanical, can be reliably promote the automation of the vane pump of the assembly process.

Further, in the third aspect of the invention, the assembly side end surface of the cam ring (front / back surface identification) may be determined by various methods. For example, the orientation of the cam surface may be determined by image processing or an optical sensor. It may be determined by sorting with a sorting guide means or the like corresponding to the taper portion on the peripheral edge of the cam ring.However, for the reference positioning around the circumference of the cam ring that has been distinguished from the front and back sides, especially on the flat surface of the table, contact with the cover side. On the circular cam ring with the contacting end face facing upward, the detection pin displaceable in the axial direction at the position where it can be opposed to the through hole of this cam ring is brought into contact with the end face, and the table is relatively rotated to detect the detection pin. Of the dowel pin is inserted into the tapered part of the opening edge of the through hole, and the dowel pin is inserted into the through hole of the cam ring at the position where the axial displacement of this detection pin is maximum. Detecting a capability of assembling the reference position, corresponding to the cam ring in this state to the side plate,
By assembling the cam ring and mechanically performing the reference positioning process, the vane pump assembly process can be automated while allowing various front / back discrimination systems to be adopted.

[0018]

1 to 8 show one embodiment of the present invention.

In FIGS. 1 and 2, reference numeral 1 denotes a body of a vane pump having a drive shaft 50 coupled with a pulley 51 and having a valve hole for accommodating the flow control valve 4, and the body 1 is a pulley 51. Accommodates the pump cartridge 3 of the vane pump including the side plate 8 and the cam ring 30 from the side of the opening end surface 1A on the opposite side.
The cover 2 is coupled to the.

A shaft hole is formed through almost the center of the body 1, and a bearing metal 18 fixed in the shaft hole supports a drive shaft 50. The rotor 31 spline-connected to the drive shaft 50 rotates. To drive.

The pump cartridge 3 is connected to the drive shaft 50 and is rotatably accommodated in the inner circumference of the cam ring 30, and a plurality of slits 31A provided in the rotor 31 to accommodate the pump cartridge 3 in the radial direction. A vane 32 that can freely move in and out and a vane 3 that has a predetermined cam surface on the inner circumference.
2 and a cam ring 30 in sliding contact with each other.

In FIG. 1, a substantially concave space is formed inside the body 1 from the opening end face 1A side, and the pump cartridge 3 and the side plate 8 are housed in this space.
A cover 2 formed by die casting or the like is fastened to the open end surface 1A of the body 1.

Joining end face 2 of cover 2 facing body 1
A pump cartridge 3 is in contact with A, and the pump cartridge 3 has a disc-shaped side plate 8 interposed between the pump cartridge 3 and the inner peripheral bottom portion of the body 1 having a concave shape. The cam ring 30 constituting the above is sandwiched between the side plate 8 and the cover 2.

Here, a high-pressure chamber 12 is defined inside the body 1 between the high-pressure chamber 12 and the side plate 8, and the high-pressure chamber 12 and the valve hole of the flow control valve 4 communicate with each other through a passage 11.

Then, a low pressure communication passage 9 is provided to circulate the excess working oil in the suction connector 5 and the flow control valve 4 communicating with the outside of the body 1 to the suction region of the pump cartridge 3.
The hydraulic oil discharged from the pump cartridge 3 to the high pressure chamber 12 through the high pressure port 81 of the side plate 8 is supplied to the power steering device (not shown) through the passage 11 and the flow control valve 4 to supply the necessary flow rate. To be done.

On the other hand, the surplus flow rate from the flow rate control valve 4 and the hydraulic oil from the suction connector 5 are transferred from the low pressure communication passage 9 to the suction chamber 10 defined between the outer circumference of the cam ring 30 and the inner circumference of the body 1. Inflow. The cover 2 facing the opening end surface 1A of the body 1 is formed with a bifurcated bifurcated groove 6 that branches into a bifurcated shape, from the cover 2 side to the suction region of the pump cartridge 3 via the bifurcated groove 6. On the other hand, on the side plate 8 side, from the gap (not shown) between the end surface of the cam ring 30 and the step portion (not shown) formed on the end surface of the side plate 8 on the cam ring 30 side, as shown in FIG. The hydraulic oil is sucked from the left side in the figure, and the cam ring 30 is attached to the pump cartridge 3.
The hydraulic oil is supplied substantially evenly from both sides of the end surface of the.

As shown in FIGS. 3 to 8, the cam ring 30 constituting the pump cartridge 3 has a circular outer circumference and has a predetermined cam surface on the inner circumference. Round hole 40 and elliptical hole 41
Are formed through.

The cam ring 30 is restricted from rotating by inserting a pair of dowel pins 42 provided upright on the substantially disk-shaped side plate 8 into the perfect circular pin hole 40 and the elliptical pin hole 41. The side plate 8 and the side plate 8 are connected in a predetermined positional relationship, and the discharge area on the inner periphery of the cam ring 30, the high pressure port 81 of the side plate 8, the suction area, the cover 2, and the low pressure port (not shown) of the side plate 8 face each other. The cam ring 30 has a perfect circular pin hole 40.
Is attached as a reference, and the assembling error of the dowel pins 42, 42 is absorbed by the elliptical pin hole 41.

The cam ring 30 has an end face 30A that abuts the side plate 8 and an end face 30B that abuts the cover 2. The end face 30A has a perfect circular pin hole 40 and an elliptical pin hole 41 at the open positions. 5, step portions 30D and 30E having a predetermined depth are formed as shown in FIG.
A tapered portion 30C is formed over the entire periphery of the peripheral portion of A and the peripheral portions of the step portions 30D and 30E. The peripheral edge on the side of the end face 30B is formed at a right angle.

Then, as shown in FIG. 7, a predetermined taper portion 40A is formed on the peripheral edge of the perfect circular pin hole 40 opened on the end surface 30B that abuts the cover 2, while the opening portion on the side of the elliptical pin hole 41 is formed. 41A has a right-angled cross-sectional shape as shown in FIG.

The configuration is as described above. Next, the operation will be described.

By the way, in the assembly of such a vane pump, the cam ring 30 is inserted into the dowel pin 42, which has been erected by press-fitting or the like into the side plate 8 in advance in a separate process, inside the body 1 whose inner periphery is formed in a concave shape. 3 is assembled, and the cam ring 30 and the side plate 8 assembled in advance as subassemblies are incorporated into the body 1. An example of this assembly process will be described with reference to FIG. 9 (A) to 9 (D) show the main assembling process, and in the same figure (B-
1) and (B-2) show the sub-assembly process.

First, in FIG. 9 (A), with the bearing metal 18 and the flow control valve 4 and other parts already assembled inside the body 1, the tip of the drive shaft 50 is directed toward the bearing metal 18 and the body 1 is moved. Insert toward the opening end face side of.

Then, in FIG. 9B, the side plate 8 and the pump cartridge 3 preassembled in the sub-assembling step are accommodated in the body 1 from the side plate 8 side, and the rotor 31 is mounted on the drive shaft 50. Bind to.

Here, in the sub-assembly process of the pump cartridge 3 and the side plate 8, first, in FIG. 9 (B-1), the base ends of the dowel pins 42, 42 are press-fitted into the holes (not shown) of the side plate 8 to be joined. Let

Next, as shown in FIG. 9B-2, the perfect circular pin hole 40 and the elliptical pin hole 41 of the cam ring 30 are inserted into the dowel pin 42 whose base end is connected to the side plate 8 to insert the cam ring 30. End plate 30A on the side plate 8
The rotor 31 and the vane 32 are assembled to the inner circumference of the cam ring 30 in a state of being brought into contact with the end surface of the side plate 8 and the pump cartridge 3 in this way.

Then, in (B) of the main assembly process, by attaching a retaining ring to the drive shaft 50 having the rotor 31 assembled, the rotor 31 and the drive shaft 50 are axially coupled, and the pump cartridge 3 and the side plate. 8 and the drive shaft 50 do not fall off the body 1.

In this way, after the pump cartridge 3 and the side plate 8 are housed inside the body 1, as shown in FIG.
As shown in (C), the cover 2 is attached to the open end surface 1 of the body 1.
By assembling to A and fastening the bolts respectively as shown in FIG. 9 (D), the cover 2, the pump cartridge 3 and the side plate 8 are connected in a predetermined positional relationship, that is, the high pressure port 81 of the side plate 8 is The high pressure chamber 12 of the body 1 and the bifurcated groove 6 of the cover 2 are assembled at predetermined positions facing the low pressure passage 9, respectively.

Here, in the sub-assembling step of FIG. 9 (B-2) for assembling the pump cartridge 3, the front and back of the cam ring 30 are judged, and the perfect circular pin hole 40 and the elliptical pin hole 41 around the circumference of the cam ring. The positioning is performed automatically, and the details will be described below.

First, as shown in FIGS. 10 to 12, the front and back are judged by a jig 90 having a concave portion 91 engageable with the peripheral taper portion 30C of the end surface 30A on the front side of the cam ring 30, and not shown. This is performed by the distance detecting means.

The jig 90 is composed of a disk-shaped member, and has a circular concave portion 91 formed on one end surface thereof and a bottom surface 90A of the other formed on a flat surface. A taper portion 92 that can be engaged with the taper portion 30C of the cam ring 30 is provided on the peripheral edge of the recess 91.
To form The jig 90 is supported so that it can be displaced in the vertical direction in the figure with the recess 91 facing downward.

The cam ring 30 is placed on a plane facing the jig 90, the cam ring 30 is arranged coaxially with the recess 91 of the jig 90, and then the jig 90 is displaced toward the cam ring 30. The tapered portion 92 is brought into contact.

At this time, if the end surface 30A on the front side of the cam ring 30 faces the jig 90, as shown in FIG.
Since it engages with the tapered portion 30C of 0, the cam ring 30
30A penetrates into the concave portion 91, and the height Ha from the plane on which the cam ring 30 is placed to the bottom surface 90A of the jig 90 detected by the distance detecting means is the height Ha of the jig 90 and the cam ring 30.
Since it is smaller than the sum of the thicknesses of the
Is determined to be the front side, and the rear surface of the cam ring 30 (30
After the reversing step of directing B) upward, it is conveyed to the positioning step described later.

On the other hand, as shown in FIG. 12, the cam ring 3
When the end surface 30B, which is the back surface of 0, faces the jig 90, the jig 90 displaced downward stops at the position where the end surface on the concave portion 91 side and the end surface 30B of the cam ring 30 come into contact with each other. Since the height Hb is equal to the sum of the thicknesses of the jig 90 and the cam ring 30, it is determined that the end surface 30B, which is the back surface, of the cam ring 30 is directed upward, and in this state, the cam ring 30 is conveyed to the positioning step described later. .

In this way, after the end face 30A of the cam ring 30 that abuts the side plate 8 is determined, the step of detecting and positioning the true circular pin hole 40 which becomes the reference position around the circumference of the cam ring when inserting the dowel pins 42, 42. I do.

This detection and positioning process is shown in FIGS.
As shown in FIG. 13, the cam ring 30 is placed, and the rotating table 95 and, as shown in FIG. 13A, a columnar detection pin capable of contacting the end surface 30B of the cam ring 30 and displaceable in the axial direction. 96 and a displacement amount detection means (not shown) for detecting the displacement amount of the detection pin 96. The detection pin 96 is arranged on a predetermined circumference that can face the perfect circular pin hole 40.

The detection pin 96 has a hemispherical tip portion 96A which comes into contact with the end surface 30B which is the back surface of the cam ring 30, and the outer diameter of the detection pin 96 is the inner diameter of the true circular pin hole 40 and the elliptical pin hole 41. It is set larger.

From the front / back surface discrimination step, the cam ring 30 is coaxially placed on the table 95 with the end surface 30B to be the back surface facing upward, and then the detection pin 96 is displaced downward so that the end surface 30B is located. Abut.

As shown in FIG. 13, when the front end portion 96A is in contact with the end face 30B, the height from the end face 30B to the base end 96B of the detection pin 96 is a predetermined amount Hc.

Next, when the table 95 is rotated to reach the position where the perfect circular pin hole 40 faces the detection pin 96, FIG.
4, the detection pin 96 has a hemispherical tip portion 96A.
Is a tapered portion 40A formed on the periphery of the round pin hole 40
The height Hd from the end face 30B to the base end 96B of the detection pin 96 at this time is smaller than Hc in the initial state, and the displacement amount of the detection pin 96 in the axial direction increases.

On the other hand, when the detection pin 96 penetrates into the elliptical pin hole 41 having a substantially right-angled cross section, the amount of penetration of the tip portion 96A of the detection pin 96 is larger than that in the case where it penetrates into the perfect circular pin hole 40. Therefore, it can be determined that the position where the displacement amount of the detection pin 96 in the axial direction is the largest is the position where the detection pin 96 and the perfect circular pin hole 40 face each other. The rotation is stopped, and the dowel pins 42 and 42 erected on the side plate 8 are transferred to the assembly process shown in (B-2) of FIG. It can be inserted.

When the dowel pins 42, 42 are inserted, as shown in FIGS. 5 and 6, the end face 30A on the front side of the cam ring 30 is assembled so as to face the side plate 8, and the perfect circular pin hole 40 and the elliptical pin hole are formed. When the dowel pins 42, 42 are inserted into 41, the dowel pins 42, 42 can be smoothly guided to the inner circumference of these holes by the stepped portions 30D, E formed at the end surface 30A and the taper portion 30C at the peripheral edge.

Thus, the cam ring 30 having the pin holes for engaging the pair of dowel pins 42, 42 provided upright on the side plate 8 is provided with the peripheral edge portion of the end face 30A on the side facing the side plate 8 and the round pin hole. 40 and oval pin hole 4
The front and back of the cam ring 30 can be easily determined by a jig having a tapered portion 30C formed on the periphery of the opening of No. 1 and having a tapered portion 92 that engages with the tapered portion 30C of the end surface 30A. On the end surface 30B of the cam ring 30 facing the second side, a tapered portion 40A is formed at the opening of the perfect circular pin hole 40 which serves as a reference for circumferential positioning of the cam ring 30, while the opening of the other elliptical pin hole 41 is formed. Since no taper is formed on the portion 41A,
The detection pin 96 capable of penetrating the tapered portion 40A is provided with the end surface 30.
The position where the displacement amount of the detection pin 96 in the axial direction is the maximum when the relative rotation is performed while making contact with B, is the position where the detection pin 96 faces the perfect circular pin hole 40, and the reference position at the time of assembly is set. It can be easily and quickly detected to drive automation of vane pumps.

[0054]

As described above, according to the first aspect of the present invention, in the assembly process of the vane pump, the through hole of the cam ring is inserted into the dowel pin erected on the side plate, and the rotor and the vane are assembled to the inner circumference of the cam ring. However, since the taper is formed on the peripheral edge of the end surface where the cam ring contacts the side plate, the front and back of the cam ring can be easily discriminated, and there are multiple penetrations on the end surface of the cam ring on the side contacting the cover. A hole opens, but since a taper part is formed on the periphery of one of the openings and this is used as a reference hole, positioning when inserting the cam ring into the dowel pin can be performed quickly and easily, and it can be used on the assembly line. If a jig for determining the end surface of the cam ring is provided, it is possible to realize automatic determination of the front and back of the cam ring. If a detection pin that comes into contact with the end face on the cover side is provided while rotating the cam ring, the positioning when assembling the cam ring to the dowel pin can be automatically detected using the position where the displacement amount of the detection pin is maximum as the reference position. The dowel pin can be inserted into the cam ring at this position, so the end face of the cam ring on the assembly side can be automatically determined, and the dowel pin can be inserted by automatically detecting the predetermined position around the circumference of the cam ring. The automation of the possible assembly process can be promoted, and the manufacturing cost can be reduced as compared with the conventional example.

According to the second aspect of the invention, a cam ring placed on a predetermined plane is brought into contact with a jig having a recess capable of engaging with the taper portion of the cam ring, and the jig is brought into contact with the end face of the cam ring to cure the cam ring from the plane. Detecting the height of the tool to a predetermined position,
If this height is less than a predetermined value, the end face can be determined to be the surface, the end face that should be the front side of the cam ring with the tapered portion can be easily identified, and if the end face is detected, the side face is detected. It can be assembled on the plate side, and for the positioning of the cam shape around the circumference of the cam ring, a detection pin is provided that comes into contact with the end face of the circular cam ring placed on a predetermined plane while rotating it. The cam pin can be inserted into the dowel pin by detecting the position where the detection pin is fitted in the taper portion of the opening peripheral edge of the through hole used as the reference hole and the displacement amount of the pin is the maximum, and the cam ring can be inserted into the dowel pin. By performing all the processes mechanically, automation of the assembly process of the vane pump can be surely promoted, and the manufacturing cost can be reduced as compared with the conventional example. Kill.

Further, in the third aspect of the invention, the assembly side end surface of the cam ring may be discriminated (front / back discrimination) by various methods, and the freedom to employ the front / back discrimination method most suitable for the factory line can be obtained. On the other hand, regarding the circumferential positioning of the cam ring which has been distinguished from the front and back sides, in particular, a circular cam ring having the end surface to be brought into contact with the cover side on the flat surface of the table is placed upward, The table is relatively rotated while abutting the end face of the detection pin, which is displaceable in the axial direction at a position where it can oppose, and the detection pin is fitted into the taper portion of the opening peripheral edge of the through hole to detect the axial direction of the detection pin. The position where the displacement is maximized is detected as the assembly reference position where the dowel pin can be inserted into the through hole of the cam ring, and in this state, the cam ring corresponds to the side plate and is assembled. Bets can be, all the reference positioning step of the cam ring is mechanically performed that can promote the automation of the vane pump assembly process while allowing adoption of various sides discrimination method.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a vane pump showing an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrows AA in FIG.

3A and 3B are enlarged views of a cam ring, FIG. 3A is a front view, and FIG. 3B is a sectional view taken along the line BB of FIG.

FIG. 4 is a rear view of the cam ring.

FIG. 5 is an enlarged view of portion C of FIG. 3A, also showing the cam ring.

FIG. 6 is a sectional view taken along the line EE in FIG. 5;

FIG. 7 is an enlarged view of portion D of FIG.

FIG. 8 is a front view of a through hole of the cam ring.

9A and 9B are explanatory views showing the outline of the assembly process of the vane pump, wherein FIG. 9A is a shaft assembly, FIG. 9B is a pump cartridge assembly, FIG. 9C is a cover assembly, and FIG. The body fastening process is shown, while (B-1) and (B-2) show the subassembly process of the pump cartridge, (B-1) shows the press-fitting of the dowel pin, and (B-2) shows the sub-assembly process. The process of assembling the pump cartridge and the side plate is shown respectively.

FIG. 10 is a side view showing how the front and back of the cam ring are judged.

FIG. 11 is also a side view showing how the front and back of the cam ring are judged, showing a case where the surface faces upward.

FIG. 12 is a side view showing how the front and back of the cam ring are determined, showing the case where the back surface faces upward.

13A and 13B show a state in which a pin hole is being detected, FIG. 13A is a sectional view of a main part of a cam ring, and FIG. 13B is a plan view.

14A and 14B show a state in which detection of a pin hole is completed, FIG. 14A is a sectional view of a main part of a cam ring, and FIG. 14B is a plan view.

FIG. 15 is an enlarged view of part F of FIG.

FIG. 16 is a sectional view of a conventional vane pump.

FIG. 17 is a view taken along the line ZZ of FIG.

FIG. 18 is a front view of the cam ring.

[Explanation of symbols]

 1 Body 1A Open End Face 2 Cover 2A Joint End Face 3 Pump Cartridge 4 Flow Control Valve 5 Suction Connector 6 Bifurcated Groove 8 Side Plate 9 Low Pressure Communication Passage 10 Suction Chamber 11 Passage 12 High Pressure Chamber 18 Bearing Metal 30 Cam Ring 30A, 30B End Face 30D, E step portion 30C taper portion 40A taper portion 41A opening portion 40 round pin hole 41 elliptical pin hole 31 rotor 32 vane 42 dowel pin 50 drive shaft 51 pulley 81 high pressure port 90 jig 91 recess 92 taper portion 95 table 96 detection pin

Claims (3)

[Claims] 1. A cam ring that rotatably accommodates a rotor coupled to a drive shaft and a vane that is provided in and out of the rotor, and a body that axially supports the drive shaft and that accommodates the cam ring. In a vane pump including a side plate interposed between the body and an end surface of a cam ring, and a cover that is in contact with the other end surface of the cam ring and is coupled to the body, the side plate has at least 1 axially symmetrical portion. A pair of dowel pins are erected, the outer periphery of the cam ring is formed in a circular shape, a plurality of through holes for inserting these pins are formed, and a tapered portion is formed on the peripheral edge of the end face where the cam ring contacts the side plate. On the other hand, one of the through holes opened on the other end face of this cam ring should have a circumference of its opening so as to make it a reference hole. A vane pump having a tapered portion at its edge. 2. A cam ring that rotatably accommodates a rotor coupled to a drive shaft, and a vane that is provided in and out of the rotor, and a body that axially supports the drive shaft and that accommodates the cam ring. A side plate interposed between the body and an end surface of the circular cam ring, a cover that is in contact with the other end surface of the cam ring and is coupled to the body, and at least an axially symmetrical standing member on the side plate. One set of dowel pins, a plurality of through holes formed in the cam ring and through which the pins are inserted, and a taper portion formed on the peripheral edge of the end face that abuts the side plate of the cam ring, while the cover of the cam ring is provided. This cover is provided with a taper portion formed on the peripheral edge of the opening so that one of the through holes opened on the contacting end surface becomes the reference hole. In the method of assembling the vane pump, which inserts the mulling into the dowel pin and automatically assembles it to the side plate, a circular cam ring placed on a predetermined plane is provided with a circular recess that can be engaged with the taper portion of the peripheral edge of the cam ring. The step of bringing the provided jig into contact with the end face of the cam ring and the height from the plane to a predetermined position of the jig are detected, and if this height is less than the predetermined value, the end face is determined to be the surface. And a step of moving and mounting a circular cam ring with the end face facing downward on a table provided with a predetermined plane, and a detection pin displaceable in the axial direction at a position where it can face the through hole of the cam ring, The step of rotating the detection pin relative to the table while abutting the end surface above the cam ring and the axial displacement of the detection pin are detected, and this displacement is determined to be the maximum. Assembly method of the vane pump, characterized in that it comprises a step of determining cam ring assembly reference position at a position where a. 3. A cam ring that rotatably accommodates a rotor coupled to a drive shaft, and a vane that is provided in and out of the rotor, and a body that axially supports the drive shaft and that accommodates the cam ring. A side plate interposed between the body and an end surface of the circular cam ring, a cover that is in contact with the other end surface of the cam ring and is coupled to the body, and at least an axially symmetrical standing member on the side plate. One set of dowel pins, a plurality of through-holes formed in the cam ring and through which the pins are inserted, and one of the through-holes opened in the end face that abuts the cover of the cam ring, so that the reference hole is formed. A vane pump assembly that is equipped with a taper part formed on the peripheral edge, and inserts this cam ring into the dowel pin and automatically assembles it to the side plate. In the stand-up method, the end face on the side facing the cover is determined on the table having a predetermined flat surface,
A step of placing a circular cam ring with this end face facing upward, and a detection pin displaceable in the axial direction at a position where it can face the through hole of this cam ring are brought into contact with the end face of the cam ring while being attached to the table. A vane pump including: a step of relatively rotating the vane pump; and a step of detecting an axial displacement amount of the detection pin and determining an assembly reference position of the cam ring at a position where the displacement amount is maximum. How to assemble.