JP2002130235A - Device for holding ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for holding ring, capable of preventing the dropping-out of a ring-like locking member caused by wear or deformation of a member, engaging with the locking member by preventing pressure centralization resulting from nonuniform engagement of the locking member with the engaging face of an annular engagement groove. SOLUTION: The cross section of a C-ring 8 is formed into a square shape, and its four planes 8a, 8b, 8c and 8d are formed slanted at a 45 deg. angle with respect to the diametral direction line of the C-ring. Besides, the cross section of the annular engagement groove 17, which is formed on the inner peripheral face of a pump housing 1 to be engaged with the C-ring 8, is formed into a V shape, in such a manner that adjacent two slanted planes 7a and 7b cross at right angles. Further, the axial edge face of a sidewall member 6, which is protruded from the groove 17 to be locked to the C-ring 8, has a slanted plane 6a to be abutted on another slanted plane 8c in the C-ring 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to, for example, a cylindrical member and a shaft member which is attached to the cylindrical member so as to be movable in the axial direction while being in contact with the cylindrical member, and formed on an inscribed surface of the cylindrical member. A C-ring is attached to the formed annular engagement groove, and the axial end face of the shaft-like member is locked to a C-ring projecting outside from the annular engagement groove, so that a relative axial direction between the cylindrical member and the shaft-like member is obtained. The present invention relates to a holding ring device that prevents movement.

[0002]

2. Description of the Related Art As a conventional holding ring device, for example, one having a structure as described in Japanese Patent Application Laid-Open No. H11-351158 is disclosed. That is, this conventional example is an example applied to a vane pump. In this vane pump, as shown in an enlarged sectional view of a main part in FIG. 9, a pump element mounting hole 102 in a pump housing (tubular member) 101 is formed. An annular engaging groove 10 having a semicircular cross section on the inner peripheral surface.
A C-ring (ring-shaped locking member) 104 having a circular cross section is mounted and locked in the annular engagement groove 103, so that a pump cover (shaft-shaped member) previously mounted in the mounting hole 102. The end surface of the C-ring 105 is held in contact with the protruding portion of the C-ring 104 to prevent the C-ring 104 from coming off.

[0003]

However, in the conventional holding ring device, since the C-ring 104 having a circular cross section is used as described above, there are the following problems. . That is, the pump cover 105
, A large internal pressure acts on the C-ring 10.
4, the C-ring 104 is pressed in the axial direction, and the pressing force presses the C-ring 104 against the inner peripheral surface of the annular engagement groove 103 with a strong force.

However, as in the prior art, the C ring 10
4 has a circular cross section, it is not easy to form the annular engagement groove 103 that accurately engages the outer circular arc surface of the C ring 104. A slight gap is formed between the engagement surfaces of the groove 103 and the inner circumferential arc surface, and thereby, the load is repeatedly applied in a state where uneven pressure is concentrated on the engagement surface, so that the annular engagement groove 103 is formed. Set or deform at the opening end. In particular, recently, since the pump housing 101 is formed of aluminum or the like for weight reduction,
In the worst case, the C ring 104 may fall off.

The present invention has been made in view of the above-mentioned conventional problems, and is intended to prevent pressure concentration due to uneven engagement of a ring-shaped locking member with an engagement surface of an annular engagement groove. Another object of the present invention is to provide a holding ring device that can prevent the ring-shaped locking member from falling off due to set or deformation of a member with which the ring-shaped locking member is engaged.

[0006]

In order to achieve the above object, a holding ring device according to a first aspect of the present invention is mounted so as to be axially movable in a state of being inscribed in a cylindrical member and the cylindrical member. A notch ring-shaped locking member is attached to an annular engagement groove formed on one of the inner contact surfaces with the inscribed member, and a ring-shaped engagement protrudes outside from the annular engagement groove. In a holding ring device in which the axial end face of the other member is locked to the member to prevent the relative axial movement between the tubular member and the inscribed member, the ring-shaped locking members are at least mutually separated. The ring-shaped locking groove is formed in a cross-sectional shape having parallel planes, and both planes are formed as inclined planes inclined at approximately 45 degrees with respect to the radial line of the ring-shaped locking member. Inclined shape that abuts one inclined plane of the member A flat surface is formed, and an axial end surface of the cylindrical member and the inscribed member, which is locked by a ring-shaped locking member protruding from the annular engagement groove, has another end in the ring-shaped locking member. In this case, the inclined plane contacting one of the inclined planes is formed.

According to a second aspect of the present invention, there is provided a holding ring device according to the first aspect, wherein the ring-shaped locking member has a square cross section.

According to a third aspect of the present invention, in the holding ring device according to the second aspect, the annular engaging groove is formed in a V-shape in which two adjacent planes intersect at right angles. Means.

According to a fourth aspect of the present invention, in the holding ring device according to any one of the first to third aspects, both ends of the notch of the ring-shaped locking member are displaced in the axial direction. Means formed in the above.

According to a fifth aspect of the present invention, there is provided a holding ring device according to the third or fourth aspect, wherein the tubular member is a pump casing provided with a hole for assembling a pump element in a vane pump; An annular member formed on the inner peripheral surface of the pump element assembling hole by an elastic repulsive force of the pump cover, wherein the ring-shaped member is a pump cover mounted on an open end side of the pump element assembling hole. The engaging means is engaged with the inner surface of the engaging groove in a state of being urged in a direction of constantly pressing.

[0011]

In the holding ring device according to the first aspect of the present invention, since it is configured as described above, for example, in a structure in which an annular engagement groove is formed on the cylindrical member side, an inner contact member is formed. In a state in which a force for axially moving the annular member and the inscribed member relative to each other in a direction in which the end surface is locked to the ring-shaped locking member acts, and the ring-shaped locking member receives a shearing force, the end surface of the inscribed member The inclined planes formed on the ring-shaped engaging member and the parallel inclined planes formed on the annular engaging groove are in surface contact with each other. That is, compared to the case of the arcuate surfaces, the flat surfaces can easily and accurately engage with no gap, and the pressure concentration on the engagement surfaces is prevented.
Therefore, it is possible to prevent pressure concentration due to uneven engagement of the ring-shaped locking member with the engagement surface of the annular engagement groove,
Accordingly, it is possible to prevent the ring-shaped locking member from falling off due to the set or deformation of the member with which the ring-shaped locking member is engaged.

In the holding ring device according to the second aspect, as described above, since the cross-sectional shape of the ring-shaped locking member is formed to be a square, a second moment of area (compared to a circular cross-section having the same diameter) is obtained. (Spring constant) is reduced, so that when the ring-shaped locking member is detached from the annular engagement groove, the force required for expanding and reducing the diameter of the ring-shaped locking member is small. Workability when attaching and detaching the stop member can be improved.

According to the third aspect of the present invention, as described above, the cross-sectional shape of the annular engaging groove is formed in a V-shape in which two adjacent planes intersect at right angles. The positioning and mounting of the square-shaped ring-shaped locking member in the mating groove can be easily performed, and a high joining strength can be obtained.

In the holding ring device according to the fourth aspect, as described above, both ends of the notch of the ring-shaped locking member are formed so as to be displaced in the axial direction, so that the ring-shaped locking member is formed with respect to the annular engagement groove. In the mounted state of the ring-shaped locking member, both ends of the notch of the ring-shaped locking member are pressed and urged in a direction of contacting both inclined planes in the annular engagement groove. Therefore, it is possible to prevent rattling between the annular engagement groove and the ring-shaped locking member in a no-load state.

In the holding ring device according to the fifth aspect, as described above, by applying to the vane pump, the pump cover can be prevented from falling off.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment of the Invention) First, the configuration of a first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a longitudinal sectional view showing a vane pump to which a holding ring device according to Embodiment 1 of the present invention is applied. In this figure, 1 is a pump casing (tubular member), 2 is a pressing spring, 3 is a movable side wall member, 4 is a cam ring, 5 is a rotor, 6 is a side wall member (shaft member, pump cover), and 7 is a drive shaft.

More specifically, the pump casing 1 is provided with an oil suction port 11 and an oil discharge port (not shown), and a cylindrical hollow portion (a pump element mounting hole) is formed on one side surface of the pump casing 1. ) 12 is formed, and a bearing hole 13 coaxially communicating with the hollow portion 12 is formed on the other side surface.
Are formed.

The pressing spring 2, the movable side wall member 3, the cam ring 4, the rotor 5, and the side wall member 6 are sequentially housed in the hollow portion 12. Also,
The drive shaft 7 passes through the bearing hole 13 of the pump casing 1, and is
Is rotatably supported. The distal end of the drive shaft 7 is rotatably supported by a bearing hole 6 b formed in the side wall member 6. The snap ring 9 attached to the drive shaft 7 locks the end face on the inner peripheral side of the vane rotor 5 to restrict the axial movement, thereby preventing the drive shaft 7 from coming out of the bearing hole 6a. An oil seal 15 that rotationally seals between the drive shaft 7 and the pump casing 1 is provided at an opening edge of the bearing hole 13.

Further, between the outer peripheral surface of the side wall member 6 and the inner peripheral surface of the hollow portion 12 is hydraulically sealed by a seal ring 16 provided on the inner peripheral surface side of the hollow portion 12 in the pump casing 1, Thus, the side wall member 6 is provided on the opening side of the hollow portion 12 with respect to the cam ring 4 so as to close the opening.

The side wall member 6 is mounted and locked by a C-ring (ring-shaped locking member) 8 in an annular engaging groove 17 formed in the inner peripheral surface of the opening of the hollow portion 12 in the pump housing 1. 6 is locked in the axial direction, so that detachment from the hollow portion 12 is prevented.

Next, the structure of the C-ring 8 will be described with reference to FIGS. FIG. 2 is a front view of the C ring 8,
3 is a bottom view, FIG. 4 is a longitudinal side view taken along line IV-IV of FIG. 2, FIG. 5 is an enlarged view showing a detail of a portion A in FIG. 4, and FIG. 6 is a detail of a C ring 8 portion in FIG. It is a principal part expanded sectional view shown.

That is, the C-ring 8 is formed in a cut-out ring partly cut away by a wire having elasticity, has a square cross-sectional shape, and has four planes,
The C-ring 8 is formed on inclined planes 8a, 8b, 8c, 8d inclined at 45 degrees with respect to the radial line.

The cross-sectional shape of the annular engaging groove 17 in which the C-ring 8 is mounted is such that two adjacent inclined planes 1 are formed.
7a, 17b are formed in a V-shape crossing at right angles, and two inclined planes 8a, 8b adjacent on the outer peripheral side of the C-ring 8 are engaged with the inclined planes 17a, 17b, respectively. Has become.

The outer peripheral surface of the outer end surface of the side wall member 6 which faces the C ring 8 protruding from the annular engagement groove 17 in the axial direction is in contact with the inner inclined flat surface 8c on the inner peripheral side of the C ring 8. An inclined plane 6a is formed.

The outer diameter of the C-ring 8 in a no-load state is formed slightly larger than the inner diameter of the bottom of the annular engaging groove 17 and, as shown in FIG. They are formed so as to be displaced from each other.

Next, the operation and effect of the first embodiment of the present invention will be described. In the first embodiment of the present invention, since the configuration is as described above, when the C-ring 8 is mounted in the annular engagement groove 17 as shown in FIGS. Due to the repulsive force, the inner surface of the annular engagement groove 17 is urged in a direction of constantly pressing in a radial direction.

Further, the side wall member 6 pressed outward in the axial direction by the internal pressure (discharge hydraulic pressure) of the vane pump abuts on the inner inclined plane 8c on the inner peripheral side of the C ring 8 and is locked. Since the inclined flat surface 8a of the ring 8 is locked to the inclined flat surface 17a of the annular engagement groove 17, the side wall member 6 is prevented from coming off.

In this state, the inclined flat surface 6a formed on the end face of the side wall member 6 is brought into abutment engagement with the inner inclined flat surface 8c on the inner peripheral side of the C-ring 8 in a surface contact state. , The outer inclined plane 8 on the outer peripheral side of the C ring 8
a and the outer inclined flat surface 17a of the annular groove 17 are brought into contact with each other in a surface contact state.

As described above, in particular, the outer inclined plane 8a and the outer inclined plane 17a in the annular groove 17 are brought into abutment engagement with each other on the outer peripheral side of the C-ring 8 in a surface contact state. In addition, since it is possible to easily and accurately engage with no gap as compared with the case where the arc surfaces are engaged as in the conventional example, pressure concentration on the engagement surface is prevented.

Accordingly, it is possible to prevent pressure concentration due to uneven engagement of the C-ring 8 with the engagement surface of the annular engagement groove 17, thereby setting the pump housing 1 with which the C-ring 8 engages. It is possible to prevent the C ring 8 from falling off due to deformation or deformation.

The inclined flat surface 6a formed on the end surface of the side wall member 6 is formed on the inner peripheral side of the C ring 8 and the inner inclined flat surface 8a.
By making contact with the member c in a surface contact state, it is possible to prevent the side wall member 6 from being set or deformed.

Further, since the C ring 8 has a square cross section, the second moment of area (spring constant) is lower than that of a circular cross section of the same diameter. When the C ring 8 is detached, the force for expanding and contracting the C ring 8 can be small, and therefore, the C ring 8
The workability at the time of attaching and detaching can be improved.

The cross-sectional shape of the annular engaging groove 17 is formed in a V-shape in which two adjacent planes intersect at right angles, so that the C-ring 8 formed in a square shape with respect to the annular engaging groove 17 is formed. Placement and mounting can be easily performed, and high bonding strength can be obtained.

Further, since both ends of the notch of the C ring 8 are formed so as to be displaced from each other in the axial direction, when the C ring 8 is attached to the annular engagement groove 17,
Both ends of the notch of the ring 8 are pressed and urged in a direction of contacting the two inclined planes 17a and 17b in the annular engagement groove 17, whereby the annular engagement groove, the C ring 8 and Can be prevented from occurring.

Next, another embodiment of the present invention will be described. In the description of the other embodiments of the present invention, the same components as those in the first embodiment of the present invention are denoted by the same reference numerals, and the description thereof will be omitted. Only the differences will be described.

(Second Embodiment of the Invention) A holding ring device according to a second embodiment of the present invention is similar to the first embodiment of the invention.
In the holding ring device, the annular engagement groove 17 for mounting the C-ring 8 is provided on the cylindrical member (pump housing 1) side, whereas the annular engagement 1 is provided on the shaft member 60 side. The difference is that the configuration is described with reference to FIG.

FIG. 7 is a longitudinal sectional side view showing a holding ring device according to a second embodiment of the present invention. As shown in this figure, a shaft-like member 60 is inserted in a state of being inscribed in a cylindrical member 10. An annular engagement groove 6 formed on the outer peripheral surface of the shaft-shaped member
1, a notched annular C-ring (ring-shaped locking member) 80 is mounted, and the end surface of the cylindrical member 10 is abutted and locked on the C-ring 80, so that the shaft of the shaft-shaped member 60 and the shaft of the cylindrical member 10 are fixed. Directional relative movement is prevented.

The C-ring 80 is formed in a cut-out ring partly cut away by an elastic wire material, has a square cross-sectional shape, and has four planes each having a C-shape.
Inclined plane 8 inclined at 45 degrees to the radial line of ring 8
0a, 80b, 80c, and 80d.

The cross-sectional shape of the annular engaging groove 61 in which the C-ring 80 is mounted is formed in a V-shape in which two adjacent inclined planes 61a and 61b intersect at right angles. C-ring 80 for flat surfaces 61a and 61b
, Two adjacent inclined planes 80c, 8 on the inner peripheral side
0d are respectively engaged.

At the inner peripheral edge of the end surface of the cylindrical member 10 which faces the C-ring 80 projecting from the annular engaging groove 61 in the axial direction, an inclined portion which comes into contact with the inner inclined flat surface 80b on the outer peripheral side of the C-ring 80 is provided. A flat surface 10a is formed.

The C-ring 80 is formed such that the inner diameter in a no-load state is slightly smaller than the inner diameter of the bottom of the annular engaging groove 61, and the cut-out ends are displaced from each other in the axial direction. ing.

Next, the operation and effect of the second embodiment of the present invention will be described. In Embodiment 2 of the present invention, since the C-ring 80 is mounted in the annular engaging groove 61 as described above, the inner surface of the annular engaging groove 61 is elastically repelled by the C-ring 80. Is in a state of being urged in a direction of being constantly pressed in the radial direction.

The cylindrical member 10 abuts on the inner inclined plane 80 b on the outer peripheral side of the C ring 80 and is locked, while the inclined plane 80 d of the C ring 80 is
The cylindrical member 10 is prevented from coming off by being locked to the inclined flat surface 61a.

In this state, the inclined flat surface 10a formed on the end face of the cylindrical member 10 is brought into contact with the inner inclined flat surface 80b on the outer peripheral side of the C-ring 80 in a surface-contact state. The outer inclined plane 80d and the outer inclined plane 61a in the annular engagement groove 61 are brought into contact with each other on the inner peripheral side of the C-ring 8 in a surface contact state.

As described above, the outer inclined flat surface 80d and the outer inclined flat surface 61a of the annular engaging groove 61 are particularly brought into contact with each other on the inner peripheral side of the C-ring 80 so as to abut. Thus, the same effect as in the first embodiment of the present invention can be obtained.

(Third Embodiment of the Invention) A holding ring device according to a third embodiment of the present invention is similar to the first embodiment of the invention.
This shows an example in which the present invention is applied to the snap ring 9 having a circular cross section in the vane pump shown in FIG. 1, and has the same basic configuration as that of the second embodiment of the present invention.

That is, the snap ring (ring-shaped locking member) 90 according to the third embodiment of the present invention has a notch partially cut away by an elastic wire as shown in an enlarged sectional view of a main part in FIG. An inclined plane 90 which is formed in an annular shape, has a square cross section, and has four planes inclined at 45 degrees with respect to a radial line of the snap ring 90.
a, 90b, 90c, and 90d.

The sectional shape of the annular engaging groove 71 in which the snap ring 90 is mounted is formed in a V-shape in which two adjacent inclined planes 71a and 71b intersect at right angles. Two adjacent inclined planes 90c and 90d on the inner peripheral side of the snap ring 90 are engaged with the planes 71a and 71b, respectively.

The inner peripheral edge of the end face of the vane rotor 5 which faces the snap ring 90 projecting from the annular engagement groove 71 in the axial direction is provided on the outer peripheral side of the snap ring 90 so as to contact the inner inclined flat surface 90b. A flat surface 51a is formed.

The other structure and operation are substantially the same as those of the holding ring device according to the second embodiment of the present invention, and therefore, description thereof is omitted. Therefore, in the holding ring device according to the third embodiment of the present invention, substantially the same effects as in the second embodiment of the present invention can be obtained.

Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and there may be design changes and the like without departing from the gist of the present invention. Are also included in the present invention.

For example, in the embodiment of the present invention, the example in which the cross-sectional shape of the C-ring 8 is formed to be a square has been described. Further, in the embodiment of the invention, as the ring-shaped locking member, the C ring 8 having a structure in which a part is cut out by an elastic wire is taken as an example, but a structure in which the ring is divided into a plurality in the circumferential direction. It may be. In this case, it is not always necessary to use a material having elasticity.

[0054]

As described above, in the holding ring device according to the first aspect of the present invention, the ring-shaped locking member is formed to have a cross-sectional shape having at least parallel planes, and the two planes are ring-shaped. An inclined plane is formed at an inclined plane inclined approximately 45 degrees with respect to a radial line of the locking member, and an inclined plane is formed in the annular engagement groove so as to contact one inclined plane of the ring-shaped engaging member. The other inclined plane of the ring-shaped locking member is provided on the axial end surface of the cylindrical member and the inscribed member which is locked by the ring-shaped locking member protruding from the annular engagement groove. With the means in which the inclined flat surface is formed to be in contact with, it is possible to easily and accurately engage in a state where there is no gap in the case of planes compared with the case of arcuate surfaces, Prevents pressure concentration at the engagement surface Therefore, it is possible to prevent pressure concentration due to non-uniform engagement of the ring-shaped locking member with the engagement surface of the annular engagement groove. An effect is obtained that the ring-shaped locking member can be prevented from falling off due to slippage or deformation.

According to a second aspect of the present invention, there is provided a holding ring device according to the first aspect, wherein the ring-shaped locking member has a square cross section so as to have the same diameter. Since the second moment of area (spring constant) is lower than that of the circular cross section, the force for expanding and contracting the ring-shaped locking member when attaching and detaching the ring-shaped locking member to and from the annular engagement groove. Therefore, the workability at the time of attaching and detaching the ring-shaped locking member can be improved.

According to a third aspect of the present invention, in the holding ring device according to the second aspect, the annular engaging groove is formed in a V-shape in which two adjacent planes intersect at right angles. With this configuration, the square-shaped ring-shaped locking member can be easily positioned and mounted in the annular engagement groove, and a high joining strength can be obtained.

According to a fourth aspect of the present invention, there is provided the holding ring device according to any one of the first to third aspects, wherein both ends of the notch of the ring-shaped locking member are displaced in the axial direction. When the ring-shaped locking member is attached to the annular engagement groove, both ends of the notch of the ring-shaped locking member are in contact with both inclined planes in the annular engagement groove. As a result, it is possible to prevent rattling between the annular engagement groove and the ring-shaped locking member in a no-load state.

According to a fifth aspect of the present invention, in the holding ring device according to the third or fourth aspect, the cylindrical member is a pump casing having a pump element mounting hole in a vane pump, and An annular member formed on the inner peripheral surface of the pump element assembling hole by an elastic repulsive force of the pump cover, wherein the ring-shaped member is a pump cover mounted on an open end side of the pump element assembling hole. Since the means is engaged while being urged in a direction of constantly pressing against the inner surface of the engagement groove, it is possible to prevent the pump cover from falling off.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a vane pump to which a holding ring device according to Embodiment 1 of the present invention is applied.

FIG. 2 is a front view showing a C-ring in the holding ring device according to the first embodiment of the present invention.

FIG. 3 is a bottom view of the C-ring.

FIG. 4 is a vertical sectional side view taken along line IV-IV of FIG. 2;

FIG. 5 is an enlarged view showing details of a portion A in FIG. 4;

FIG. 6 is an enlarged sectional view of a main part showing details of a C-ring part in FIG. 1;

FIG. 7 is a longitudinal sectional view showing a holding ring device according to a second embodiment of the present invention.

FIG. 8 is an enlarged sectional view of a main part showing a holding ring device according to a third embodiment of the present invention.

FIG. 9 is an enlarged longitudinal sectional view of a main part showing a conventional holding ring device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump casing (cylindrical member) 2 Pressing spring 3 Movable side wall member 4 Cam ring 5 Rotor 6 Side wall member (shaft member, pump cover) 6a Inclined flat surface 6b Bearing hole 7 Drive shaft 8 C ring (ring shaped locking member) 8a inclined plane 8b inclined plane 8c inclined plane 8d inclined plane 9 snap ring 10 cylindrical member 10a inclined plane 11 suction port 12 hollow part (hole for assembling pump element) 13 bearing hole 14 bearing 15 oil seal 16 seal Ring 17 Annular engagement groove 17a Inclined plane 17b Inclined plane 51a Inclined plane 60 Shaft member 61 Annular engagement groove 61a Inclined plane 61b Inclined plane 71 Annular engagement groove 71a Inclined plane 71b Inclined plane 80C Ring (ring-shaped locking member) 80a Inclined plane 80b Inclined plane 80c inclined plane 80d inclined plane 90 snap ring (ring-shaped locking member) 90a inclined plane 90b inclined plane 90c inclined plane 90d inclined plane

Continued on the front page (72) Inventor Yukio Uchida 1370 Onna, Atsugi-shi, Kanagawa F-term in Unisia Gex Co., Ltd. (reference) 3H040 AA03 BB11 CC16 DD01 DD37 DD40 3H044 AA02 BB05 DD01 DD24 DD28 3J037 AA08 JA13

Claims (5)

[Claims] An annular engagement groove formed in an inner contact surface of one of a cylindrical member and an inner member mounted axially movably in contact with the cylindrical member. The cylindrical member and the inscribed member are attached by attaching the ring-shaped engaging member of the above and locking the axial end surface of the other member to the ring-shaped engaging member protruding outside from the annular engaging groove. In a holding ring device configured to prevent axial movement, the ring-shaped locking member is formed in a cross-sectional shape having at least planes parallel to each other, and both planes are aligned with a radial line of the ring-shaped locking member. The annular engaging groove is formed with an inclined plane that is in contact with one inclined plane of the ring-shaped locking member. A ring-shaped lock projecting from the annular engagement groove A ring device for holding, characterized in that a slanted flat surface which is in contact with the other slanted flat surface of the ring-shaped locking member is formed on an axial end face of the member locked by the member. 2. The holding ring device according to claim 1, wherein a cross-sectional shape of the ring-shaped locking member is formed in a square. 3. A cross-sectional shape of said annular engaging groove is adjacent to said annular engaging groove.
The holding ring device according to claim 2, wherein the two planes are formed in a V-shape crossing at right angles. 4. The holding ring device according to claim 1, wherein both ends of the notch of the ring-shaped locking member are formed so as to be displaced in the axial direction. 5. The pump member according to claim 1, wherein the cylindrical member is a pump casing having a pump element mounting hole in the vane pump, and the shaft member is a pump cover mounted on an opening end side of the pump element mounting hole. The ring-shaped locking member is engaged with the inner surface of the annular engagement groove formed on the inner surface of the pump element assembling hole by the elastic repulsive force in such a manner that the ring-shaped locking member is constantly urged in a direction of pressing against the inner surface. The holding ring device according to claim 3 or 4, wherein: