JP2001141072A - Snap ring for locking shaft sealing member of air conditioning compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a snap ring locking a shaft sealing member to be arranged in a housing through part of a drive shaft of an air conditioning compressor having higher capability for locking the shaft sealing member in the housing than that of a snap ring having a conventional structure and equal workability to the snap ring having the conventional structure when it is mounted. SOLUTION: This snap ring locks a shaft sealing member to be arranged in a housing through part of a drive shaft of a compressor for air conditioning in a housing. One projecting part in the radial direction is formed at an inner peripheral fringe in opposition to the center of a cut-in part sandwiched between a pair of ear parts for applying external force which swell inward in the radial direction, and the inner peripheral fringe in the vicinity of the ear part swells smoothly and inward in the radial direction toward an inner fringe of the ear part over a length in the peripheral direction which is substantially the same as that of the ear part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snap ring for locking a shaft sealing member, which is provided in a housing through portion of a drive shaft of an air conditioning compressor, to a housing.

[0002]

2. Description of the Related Art A shaft sealing member for preventing leakage of lubricating oil or pressurized fluid is disposed in a housing penetrating portion of a drive shaft of an air conditioning compressor, and a snap ring for locking the shaft sealing member to a housing. Is arranged. As shown in FIG. 1, the snap ring of the conventional structure is formed as an annular thin plate member having an outer peripheral edge forming an arc and an inner peripheral edge forming an arc eccentric to the arc formed by the outer peripheral edge. . A part of the annular thin plate member is cut out to form a pair of opposing ear portions for applying an external force at the time of mounting to compress the snap ring radially inward. The ear part bulges inward in the radial direction, and a hole is formed in the center for passing a jig for applying an external force. The center Oint of the arc formed by the inner peripheral edge
Is eccentric in the direction of the center C of the cutout portion with respect to the center Oout of the arc formed by the outer peripheral edge. As can be seen from FIG. 1, in the snap ring of the conventional structure, the inner peripheral edge of a portion excluding a pair of opposing ear portions for applying an external force at the time of mounting forms a single arc.

[0003]

A snap ring of a conventional structure in which the inner peripheral edge of a portion excluding a pair of opposing ear portions for applying an external force at the time of mounting forms a single arc contacts the shaft sealing member. The radial width of the portion, more specifically, the radial width of the portion radially inward of the dash-dot line in FIG. 1 except for the pair of ears is narrow, so that the shaft sealing member is locked to the housing. If the capacity is insufficient and the shaft sealing member is a flexible rubber product, when the housing internal pressure is high, the shaft sealing member gets over the snap ring and deforms to the outside of the housing, and lubricating oil and pressurized fluid leak. There was a problem that could be. Since the center of the arc formed by the inner peripheral edge is eccentric from the center of the arc formed by the outer peripheral edge, the radial width near the ear is narrow, and the shaft sealing member is strongly pressed against the snap ring under high housing internal pressure. If the shaft seal member is made of a flexible rubber product, the shaft seal member gets over the snap ring and deforms to the outside of the housing when lubricating oil or pressurized fluid is applied. There is a problem that may leak. The present invention has been made in view of the above problems, and is a snap ring that locks a shaft sealing member provided in a housing penetration portion of a drive shaft of an air conditioning compressor to a housing, wherein the shaft sealing member is a housing. The ability to lock on is higher than the conventional structure of the snap ring,
Another object of the present invention is to provide a snap ring having the same workability as that of a conventional structure.

[0004]

In order to solve the above-mentioned problems, according to the present invention, there is provided a snap ring for locking a shaft sealing member, which is provided at a housing through portion of a drive shaft of an air conditioning compressor, to a housing. In addition, one radial projection is formed on the inner peripheral edge to face the center of the notch sandwiched between the pair of ears bulging inward in the radial direction for applying an external force. A snap ring characterized in that the peripheral edge smoothly bulges radially inward toward the inner edge of the ear over substantially the same circumferential length as the ear.

[0005] In the snap ring according to the present invention,
The pair of ears and one radial protrusion formed on the inner peripheral edge facing the center of the notch sandwiched between the pair of ears contact the shaft sealing member with a sufficient radial contact width. The contact prevents deformation of the shaft sealing member under the high housing internal pressure to the outside of the housing over the snap ring even if the shaft sealing member is a flexible rubber product. Therefore, the snap ring according to the present invention has a higher ability to lock the shaft sealing member to the housing than the conventional snap ring. Since the inner peripheral edge near the ear portion smoothly swells radially inward toward the inner edge of the ear portion over substantially the same circumferential length as the ear portion, the diameter of the snap ring near the ear portion is reduced. The width in the direction is larger than that of the conventional snap ring. As a result, even if the shaft sealing member is strongly pressed against the ear of the snap ring under a high housing internal pressure, the vicinity of the ear of the snap ring is not twisted,
The ears do not twist. Therefore, even if the shaft sealing member is a flexible rubber product, the shaft sealing member is prevented from being deformed outside the housing over the snap ring. Therefore, the snap ring according to the present invention has a higher ability to lock the shaft sealing member to the housing than the snap ring of the conventional structure.

Even if one radial projection is formed on the inner peripheral edge so as to face the center of the notch sandwiched between the pair of ears, the circumferential extension of the radial projection is small. If so, the radial protrusion does not bend and deform following the other portions, and therefore, the radial protrusion hardly contributes to an increase in the spring constant of the snap ring when a force facing the pair of ears is applied. The spring constant of the snap ring when the force facing the pair of ears is applied hardly increases as compared with the case where the radial projection is not formed. Therefore, the spring constant when a force facing the pair of ears of the snap ring according to the present invention is applied is equal to that of the snap ring of the conventional structure. Therefore, the workability at the time of mounting the snap ring according to the present invention is equivalent to that of the snap ring having the conventional structure.

According to the present invention, there is provided a snap ring for locking a shaft sealing member, which is provided in a housing penetrating portion of a drive shaft of an air-conditioning compressor, to a housing, which bulges radially inward for applying an external force. The inner peripheral edge of the region sandwiched between the pair of ears and a portion approximately 90 ° apart from the center in the circumferential direction facing the center of the notch between the pair of ears and the pair of ears Provided is a snap ring, wherein a plurality of radial projections are formed.

[0008] In the snap ring according to the present invention,
A pair of ears, and approximately 90 ° from the center in the circumferential direction facing the center of the notch sandwiched between the pair of ears bulging inward in the radial direction for applying an external force toward the pair of ears. The plurality of radial protrusions formed on the inner peripheral edge of the region sandwiched between the contact portion and the pair of ears contact the shaft sealing member with a sufficient radial contact width, so that the shaft sealing member is flexible. Even with a good rubber product, deformation of the shaft sealing member under the high housing internal pressure to the outside of the housing over the snap ring is prevented. Therefore, the snap ring according to the present invention has a higher ability to lock the shaft sealing member to the housing than the conventional snap ring.

A portion which is separated from the center of the notch portion between the pair of ear portions bulging inward in the radial direction for applying external force by approximately 90 ° from the center in the circumferential direction facing the center of the notch portion toward the pair of ear portions; The increase and decrease in the radial width of the snap ring in the region sandwiched between the pair of ears is because the distance from the region to the ears is small, so that the snap ring when a force facing the pair of ears is applied. Does not significantly affect the spring constant. Therefore, approximately 90 degrees from the center to the pair of ears, respectively.
° Even if a plurality of radial protrusions are formed on the inner peripheral edge of the region sandwiched between the separated part and the pair of ears, the spring constant of the snap ring when a force facing the pair of ears is applied, It does not increase much compared to the case where the plurality of radial projections are not formed. Therefore, the spring constant when a force facing the pair of ears of the snap ring according to the present invention is applied is equal to that of the snap ring of the conventional structure. Therefore, the workability at the time of mounting the snap ring according to the present invention is equivalent to that of the snap ring having the conventional structure.

According to the present invention, there is provided a snap ring for locking a shaft sealing member, which is provided in a housing penetrating portion of a drive shaft of an air conditioning compressor, to a housing, and bulging radially inward for applying an external force. A plurality of radial protrusions are formed on the inner peripheral edge of the part excluding the pair of ears, and a circumferential center facing the center of the notch sandwiched between the pair of ears, and a pair of the center from the center. A radially extending concave portion extending between the ear portions and the portions separated by approximately 90 ° is formed on the outer peripheral edge.

In the snap ring according to the present invention,
Since the pair of ears and the plurality of radial protrusions formed on the inner peripheral edge of the portion excluding the pair of ears abut on the shaft sealing member with a sufficient radial contact width, the shaft sealing member is Even with a flexible rubber product, deformation of the shaft sealing member outside the housing beyond the snap ring under high housing internal pressure is prevented. Therefore, the snap ring according to the present invention has a higher ability to lock the shaft sealing member to the housing than the conventional snap ring.

A central portion in the circumferential direction facing the center of the notch sandwiched between a pair of ears bulging inward in the radial direction for applying an external force, and approximately 90 from the center toward the pair of ears.
° The increase or decrease in the radial width of the snap ring in the region sandwiched between the separated portions is due to the fact that the distance from the region to the ears is large. Significantly affects the constant. In the snap ring according to the present invention, by forming a plurality of radial projections on the inner peripheral edge of the portion excluding a pair of ears,
The increase in the spring constant when a force opposing the pair of ears is applied increases the circumferential central portion facing the center of the cutout portion sandwiched between the pair of ears, and from the center to the pair of ears. By forming radial recesses on the outer peripheral edge extending between the portions that are separated from each other by approximately 90 °, the reduction in the spring constant is offset. Therefore, the spring constant when a force facing the pair of ears of the snap ring according to the present invention is applied is equal to that of the snap ring of the conventional structure. Therefore, the workability at the time of mounting the snap ring according to the present invention is equivalent to that of the snap ring having the conventional structure.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A snap ring according to a first embodiment of the present invention applied to a swash plate compressor for air conditioning will be described. As shown in FIG. 2, the swash plate type compressor has a cylinder block 1
, A piston 3 slidably received in the bore 2, a drive shaft 4, a swash plate 5 inclined and fixed to the drive shaft 4, a swash plate 5 and the piston 3. And a shoe 6 interposed therebetween. A rear housing 7 cooperates with the cylinder block 1 to sandwich a valve plate 8 on which a suction valve and a discharge valve are mounted, thereby forming a suction chamber 9 and a discharge chamber 10. A suction hole 8a and a discharge hole 8b are formed in the valve plate 8. A front housing 11 forms a crank chamber 12 in cooperation with the cylinder block 1. The drive shaft 4 and the swash plate 5 are housed in the crank chamber 12. The drive shaft 4 is rotatably supported by the cylinder block 1 and the front housing 11. The drive shaft 4 extends through the front housing 11
Extends out of the

In the front housing penetrating portion of the drive shaft 4,
A lip seal 13 is provided. Lip seal 13
Ring 1 that locks to front housing 11
4 is disposed adjacent to the lip seal 13. The snap ring 14 is engaged with the front housing 11 in a state of being fitted in an annular groove 11 a formed in the front housing 11. The lip seal 13 is sandwiched between a step 11 b of the front housing 11 located inside the lip seal 13 and a snap ring 14 located outside the lip seal 13, and
It is locked to 1.

As shown in FIG. 3, the snap ring 14
Are an outer peripheral edge 14a forming an arc and an inner peripheral edge 14 forming an arc eccentric to the arc formed by the outer peripheral edge 14a.
b) as an annular thin plate member. A part of the annular thin plate member is cut out to form a pair of facing ear portions 14c for applying a facing force at the time of mounting to compress the snap ring 14 inward in the radial direction. The ear portion 14c bulges radially inward, and has a hole 14d in the center through which a jig for applying an external force passes.
The center Oint of the arc formed by the inner peripheral edge 14b is eccentric in the direction of the center C of the notch with respect to the center Oout of the arc formed by the outer peripheral edge 14a. A pair of ears 14c
A single radial protrusion 14e is formed on the inner peripheral edge 14b so as to face the center C of the cutout portion sandwiched between the notches. Ear 14c
The nearby inner peripheral edge 14b smoothly bulges radially inward toward the inner edge of the ear 14c over substantially the same circumferential length as the ear 14c. The snap ring 14 passes a jig for applying an external force through the hole 14d of the pair of ears 14c, and applies a pair of external forces facing the pair of ears 14c via the jig. As shown, a pair of ears 1
4c are deformed in a direction of approaching each other and inserted into the front housing penetration portion of the drive shaft 4 in a state where the front shaft 4c is compressed, the external force is released to return to the original shape, and the front shaft is fitted into the annular groove 11a. Locked to the housing 11.

In the snap ring 14, the pair of ears 14c and one radial projection 14e abut against the lip seal 13 with a sufficient radial abutment width, so that the lip seal is a flexible rubber product. 13 is the crankcase 1
Even if the internal pressure is high, the front housing 11 cannot be deformed outside the snap ring 14 even when the internal pressure is high. Accordingly, the snap ring 14 has a higher ability to lock the lip seal 13 to the front housing 11 than the conventional snap ring shown in FIG. In the snap ring 14, the inner peripheral edge 14b near the ear 14c
The ear 1 extends over substantially the same circumferential length as the ear 14c.
4c swells radially inward toward the inner edge of 4c, so that the radial width near the ear is larger than that of the conventional snap ring shown in FIG. As a result, the crank chamber 12
When the lip seal 13 is strongly pressed against the ear portion 14c of the snap ring 14 when the internal pressure is high, the vicinity of the ear portion of the snap ring 14 is not twisted, and the ear portion 14c is not twisted. As a result, even when the internal pressure of the crank chamber 12 is high, the lip seal 13 cannot get over the snap ring 14 and deform outward of the front housing 11. Accordingly, the snap ring 14 has a higher ability to lock the lip seal 13 to the front housing 11 than the conventional snap ring shown in FIG.

Even if one radial projection 14e is formed on the inner peripheral edge 14b so as to face the center C of the cutout portion sandwiched between the pair of ears 14c, the extension length of the radial projection 14e in the circumferential direction can be obtained. If the diameter is small, the radial projection 14e does not bend and deform following other parts, so that the radial projection 14e
It hardly contributes to an increase in the spring constant of the snap ring 14 when a force facing c is applied. Also, a pair of ears 1
Even when the inner peripheral edge 14b adjacent to the ear 4c is smoothly expanded radially inward toward the inner edge of the ear 14c over substantially the same circumferential length as the ear 14c, 14c
Since the distance to is small, the smooth bulging portion hardly contributes to an increase in the spring constant of the snap ring 14 when a force facing the pair of ear portions 14c is applied. Therefore,
The spring constant when a force facing the pair of ears 14c of the snap ring 14 is applied is equal to that of the snap ring of the conventional structure shown in FIG. Therefore, the snap ring 14
The workability at the time of mounting is the same as that of the snap ring of the conventional structure shown in FIG.

A snap ring according to a second embodiment of the present invention will be described. As shown in FIG. 4, the snap ring 24 according to the present embodiment has an annular thin plate having an outer peripheral edge 24a forming an arc and an inner peripheral edge 24b forming an arc eccentric to the arc formed by the outer peripheral edge 24a. It is formed as a member. A part of the annular thin plate member is cut out to form a pair of opposing ear portions 24c for applying an external force at the time of mounting to compress the snap ring 24 inward in the radial direction. The ear portion 24c protrudes radially inward, and has a hole 24d in the center through which a jig for applying an external force is passed. The center Oint of the arc formed by the inner peripheral edge 24b is eccentric in the direction of the center C of the cutout portion with respect to the center Oout of the arc formed by the outer peripheral edge 24a. A pair of ears 2
4c and the inner peripheral edge 2 of a region sandwiched between the pair of ears 24c and a region approximately 90 ° apart from the center in the circumferential direction facing the center C of the notch and toward the pair of ears 24c.
4b, a plurality of radial protrusions 24e are formed. The snap ring 24 is mounted on the swash plate type compressor for air conditioning shown in FIG.

In the snap ring 24, the pair of ears 24c and the plurality of radial projections 24e abut against the lip seal 13 with a sufficient radial abutment width, so that the lip seal is a flexible rubber product. 13 is the crankcase 1
Even when the internal pressure is high, the front housing 11 cannot be deformed outside the snap ring 24 even when the internal pressure is high. Therefore, the snap ring 24 has a higher ability to lock the lip seal 13 to the front housing 11 than the conventional snap ring shown in FIG.

A portion which is separated from the center C in the circumferential direction facing the center C of the notch portion between the pair of ear portions 24c by approximately 90 ° toward the pair of ear portions 24c, and a pair of the ear portions 24c.
The increase and decrease in the radial width of the snap ring 24 in the region sandwiched between the pair of ear portions 24c is small because the distance from the region to the pair of ear portions 24c is small. Does not significantly affect the spring constant. Therefore, a plurality of radial projections 24 are formed on the inner peripheral edge 24b of the region between the pair of ears 24c and a region approximately 90 ° apart from the center toward the pair of ears 24c.
Even when e is formed, the spring constant of the snap ring 24 when a force facing the pair of ears 24c is applied does not increase much compared to the case where the plurality of radial projections 24e are not formed. Therefore, the spring constant when a force facing the pair of ears 24c of the snap ring 24 is applied is equal to that of the snap ring of the conventional structure shown in FIG. Therefore, the workability at the time of mounting the snap ring 24 is equivalent to the snap ring of the conventional structure shown in FIG.

A snap ring according to a third embodiment of the present invention will be described. As shown in FIG. 5, the snap ring 34 according to the present embodiment is an annular thin plate having an outer peripheral edge 34a forming an arc and an inner peripheral edge 34b forming an arc eccentric to the arc formed by the outer peripheral edge 34a. It is formed as a member. A part of the annular thin plate member is cut away to form a pair of opposed ear portions 34c for applying an external force at the time of mounting to compress the snap ring 34 inward in the radial direction. The ear portion 34c bulges radially inward, and has a hole 34d formed in the center thereof, through which a jig for applying an external force is passed. The center Oint of the arc formed by the inner peripheral edge 34b is eccentric in the direction of the center C of the notch with respect to the center Oout of the arc formed by the outer peripheral edge 34a. A pair of ears 3
A plurality of radial projections 3 are formed on the inner peripheral edge 34b of the portion excluding the portion 4c.
4e are formed. A radial direction extending between a central portion in the circumferential direction facing the center C of the notch portion sandwiched between the pair of ear portions 34c and a portion separated from the center portion by approximately 90 ° toward the pair of ear portions. A recess 34f is formed on the outer peripheral edge 34a. The snap ring 34 is mounted on the swash plate compressor for air conditioning shown in FIG.

In the snap ring 34, the pair of lugs 34c and the plurality of radial projections 34e abut against the lip seal 13 with a sufficient radial abutment width, so that the lip seal is a flexible rubber product. 13 is the crankcase 1
Even when the internal pressure is high, the front housing 11 cannot be deformed outside the snap ring 34 even when the internal pressure is high. Therefore, the snap ring 34 has a higher ability to lock the lip seal 13 to the front housing 11 than the conventional snap ring shown in FIG.

A region sandwiched between a central portion in the circumferential direction facing the center C of the notch portion sandwiched between the pair of ear portions 34c, and portions approximately 90 ° away from the center portion toward the pair of ear portions 34c. Since the distance from the area to the pair of ears 34c is large, the radial width of the snap ring 34 increases or decreases in the spring constant of the snap ring 34 when a force facing the pair of ears 34c is applied. Affect.
In the snap ring 34, by forming a plurality of radial protrusions 34e on the inner peripheral edge 34b of the portion excluding the pair of ears 34c, the spring constant when a force facing the pair of ears 34c is applied is increased. Has a central portion in the circumferential direction facing the center C of the cutout portion sandwiched between the pair of ear portions 34c, and approximately 90 ° from the center portion toward the pair of ear portions 34c.
A concave portion 34f extending between the outer peripheral edge 3
4a, which is offset by the decrease in the spring constant. Therefore, the spring constant when a force facing the pair of ears 34c of the snap ring 34 is applied is equivalent to that of the conventional structure of the snap ring shown in FIG. Therefore, the workability at the time of mounting the snap ring 34 is equivalent to that of the conventional structure of the snap ring shown in FIG. Outer edge 34
In FIG. 3A, the center in the circumferential direction facing the center C of the cutout portion sandwiched between the pair of ear portions 34c and the portion near the pair of ear portions 34c form an arc.
a is stably fitted.

In the above embodiment, the snap ring according to the present invention is applied to the swash plate type compressor for air conditioning. However, the snap ring according to the present invention is applied to other types of air conditioning compressors such as a scroll compressor for air conditioning. Applicable to machines.

[0025]

In the snap ring according to the present invention, a pair of ears and one radial projection formed on the inner peripheral edge facing the center of the notch sandwiched between the pair of ears are provided. ,
Since it comes into contact with the shaft sealing member with a sufficient radial contact width,
Even if the shaft sealing member is a flexible rubber product, deformation of the shaft sealing member outside the housing beyond the snap ring under high housing internal pressure is prevented. Therefore, the snap ring according to the present invention has a higher ability to lock the shaft sealing member to the housing than the conventional snap ring. Since the inner peripheral edge near the ear portion swells radially inward toward the inner edge of the ear portion over substantially the same circumferential length as the ear portion,
The radial width of the snap ring near the ear is larger than that of the conventional snap ring. As a result, even if the shaft sealing member is strongly pressed against the ears of the snap ring under a high internal pressure of the housing, the vicinity of the ears of the snap ring is not twisted and the ears are not twisted. Therefore, even if the shaft sealing member is a flexible rubber product, the shaft sealing member is prevented from being deformed outside the housing over the snap ring. Therefore, the snap ring according to the present invention has a higher ability to lock the shaft sealing member to the housing than the snap ring of the conventional structure.

Even if one radial projection is formed on the inner peripheral edge so as to face the center of the notch sandwiched between the pair of ears, the circumferential extension of the radial projection is small. If so, the radial protrusion does not bend and deform following the other portions, and therefore, the radial protrusion hardly contributes to an increase in the spring constant of the snap ring when a force facing the pair of ears is applied. The spring constant of the snap ring when the force facing the pair of ears is applied hardly increases as compared with the case where the radial projection is not formed. Therefore, the spring constant when a force facing the pair of ears of the snap ring according to the present invention is applied is equal to that of the snap ring of the conventional structure. Therefore, the workability at the time of mounting the snap ring according to the present invention is equivalent to that of the snap ring having the conventional structure.

In the snap ring according to the present invention,
A pair of ears, and approximately 90 ° from the center in the circumferential direction facing the center of the notch sandwiched between the pair of ears bulging inward in the radial direction for applying an external force toward the pair of ears. The plurality of radial protrusions formed on the inner peripheral edge of the region sandwiched between the contact portion and the pair of ears contact the shaft sealing member with a sufficient radial contact width, so that the shaft sealing member is flexible. Even with a good rubber product, deformation of the shaft sealing member under the high housing internal pressure to the outside of the housing over the snap ring is prevented. Therefore, the snap ring according to the present invention has a higher ability to lock the shaft sealing member to the housing than the conventional snap ring.

A portion which is separated from the center of the notch portion between the pair of ear portions bulging inward in the radial direction for applying an external force by approximately 90 ° from the center in the circumferential direction facing the center of the notch portion toward the pair of ear portions; The increase and decrease in the radial width of the snap ring in the region sandwiched between the pair of ears is because the distance from the region to the ears is small, so that the snap ring when a force facing the pair of ears is applied. Does not significantly affect the spring constant. Therefore, approximately 90 degrees from the center to the pair of ears, respectively.
° Even if a plurality of radial protrusions are formed on the inner peripheral edge of the region sandwiched between the separated part and the pair of ears, the spring constant of the snap ring when a force facing the pair of ears is applied, It does not increase much compared to the case where the plurality of radial projections are not formed. Therefore, the spring constant when a force facing the pair of ears of the snap ring according to the present invention is applied is equal to that of the snap ring of the conventional structure. Therefore, the workability at the time of mounting the snap ring according to the present invention is equivalent to that of the snap ring having the conventional structure.

In the snap ring according to the present invention,
Since the pair of ears and the plurality of radial protrusions formed on the inner peripheral edge of the portion excluding the pair of ears abut on the shaft sealing member with a sufficient radial contact width, the shaft sealing member is Even with a flexible rubber product, deformation of the shaft sealing member outside the housing beyond the snap ring under high housing internal pressure is prevented. Therefore, the snap ring according to the present invention has a higher ability to lock the shaft sealing member to the housing than the conventional snap ring.

A circumferential central portion facing the center of the notch portion sandwiched between a pair of radially inwardly protruding ear portions for applying an external force, and approximately 90 from the central portion toward the pair of ear portions, respectively.
° The increase or decrease in the radial width of the snap ring in the region sandwiched between the separated portions is due to the fact that the distance from the region to the ears is large. Significantly affects the constant. In the snap ring according to the present invention, by forming a plurality of radial projections on the inner peripheral edge of the portion excluding a pair of ears,
The increase in the spring constant when a force opposing the pair of ears is applied increases the circumferential central portion facing the center of the cutout portion sandwiched between the pair of ears, and from the center to the pair of ears. By forming radial recesses on the outer peripheral edge extending between the portions that are separated from each other by approximately 90 °, the reduction in the spring constant is offset. Therefore, the spring constant when a force facing the pair of ears of the snap ring according to the present invention is applied is equal to that of the snap ring of the conventional structure. Therefore, the workability at the time of mounting the snap ring according to the present invention is equivalent to that of the snap ring having the conventional structure.

[Brief description of the drawings]

FIG. 1 is a front view of a snap ring for locking a shaft sealing member of a conventional air-conditioning compressor.

FIG. 2 is a side sectional view of the swash plate type compressor to which the snap ring for locking the shaft sealing member according to the first embodiment of the present invention is applied.

FIG. 3 is a front view of the snap ring for locking the shaft sealing member according to the first embodiment of the present invention.

FIG. 4 is a front view of a snap ring for locking a shaft sealing member according to a second embodiment of the present invention.

FIG. 5 is a front view of a snap ring for locking a shaft sealing member according to a third embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 cylinder block 2 bore 3 piston 4 main shaft 5 swash plate 6 shoe 7 rear housing 8 valve plate 11 front housing 12 crank chamber 13 lip seal 14, 24, 34 snap ring 14a, 24a, 34a outer peripheral edge 14b, 24b, 34b inner peripheral edge 14c, 24c, 34c Ears 14e, 24e, 34e Radial projection 34f Radial recess Oout Center of arc formed by outer peripheral edge Oint Center of arc formed by inner peripheral edge C Center of cutout

Claims (3)

[Claims] 1. A snap ring for locking a shaft sealing member, which is provided in a housing through portion of a drive shaft of an air conditioning compressor, to a housing, comprising a pair of swelling radially inwardly for applying an external force. One radial protrusion is formed on the inner peripheral edge facing the center of the cutout portion sandwiched between the ear portions, and the inner peripheral edge near the ear portion extends over substantially the same circumferential length as the ear portion, A snap ring that swells radially inward toward the inner edge of the ear. 2. A snap ring for locking a shaft sealing member, which is provided in a housing through portion of a drive shaft of an air conditioning compressor, to a housing, and a pair of radially inwardly swelling members for applying an external force. A plurality of diameters are formed on the inner peripheral edge of a region sandwiched between the pair of ears and a region approximately 90 ° apart from the center in the circumferential direction facing the center of the notch sandwiched between the ears and the pair of ears. A snap ring, wherein a direction convex portion is formed. 3. A snap ring for locking a shaft sealing member, which is provided in a housing through portion of a drive shaft of an air conditioning compressor, to a housing, comprising a pair of swelling radially inwardly for applying an external force. A plurality of radial projections are formed on the inner peripheral edge of the portion excluding the ears, a circumferential center facing the center of the notch sandwiched between the pair of ears, and a pair of ears from the center. A radially extending concave portion is formed on an outer peripheral edge of the snap ring so as to extend between the portions approximately 90 degrees apart from each other.