JP2001140829A - Snap ring for locking shaft seal member for air conditioner compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a snap ring, locking on a housing a shaft seal member arranged in a housing penetrating part of a drive shaft of an air conditioner compressor, with higher ability to lock the shaft seal member to the housing in comparison to a snap wing with a conventional structure and with the same workability during attachment as the snap ring with the conventional structure. SOLUTION: In this snap ring locking on the housing the shaft seal member arranged in the housing penetrating part of the drive shaft of the air conditioner compressor, a plurality of diametral projecting parts of three or more are formed on an inner circumferential rim of a portion excluding a pair of opposing ear parts for applying external force, and diametral recessed parts are formed on an outer circumferential rim confronting the diametral projecting parts.

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. 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. An object of the present invention is to provide a snap ring having a higher ability to lock the snap ring than the conventional structure, and having the same workability as the conventional structure when mounted.

[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. At least three or more radial protrusions are formed on the inner peripheral edge of the part excluding a pair of opposing ears for external force application, and a radial concave part is formed on the outer peripheral edge to face the radial convex part. A snap ring is provided which is characterized by being formed. In the snap ring according to the present invention, the pair of ears and the three or more radial protrusions formed on the inner peripheral edge of the portion excluding the pair of opposing ears for applying external force have a sufficient diameter. Since the shaft sealing member contacts the shaft sealing member with the direction contact width, even if the shaft sealing member is a flexible rubber product,
Deformation of the shaft sealing member outside the housing over 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. In the snap ring according to the present invention, a force facing the pair of ears is applied by forming three or more radial protrusions on the inner peripheral edge of a portion excluding the pair of ears facing the external force. The increase in the spring constant at the time of the offset is offset by the decrease in the spring constant by forming a radial concave portion on the outer peripheral edge opposite to the convex portion, so that the pair of ears of the snap ring according to the present invention. The spring constant when a force facing the part is applied is equivalent 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 through portion of a drive shaft of an air conditioning compressor, to a housing, excluding a pair of opposed ear portions for applying an external force. Three or more radial projections are formed on the inner peripheral edge of the portion, and the inner peripheral edge of the portion excluding the pair of ears is a snap ring that forms a single arc, and the snap ring is formed on the pair of ears. A snap ring is provided in which the center of the arc formed by the inner peripheral edge is closer to the center of the arc formed by the outer peripheral edge, as compared to a snap ring having the same spring constant when opposing forces are applied. I do. In the snap ring according to the present invention, a pair of ears and three or more radial protrusions formed on the inner peripheral edge of the portion excluding the pair of opposing ears for applying external force have a sufficient diameter. Since the shaft sealing member contacts the shaft sealing member with a directional contact width, even if the shaft sealing member is a flexible 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. You. 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. In the snap ring according to the present invention, a force facing the pair of ears is applied by forming three or more radial protrusions on the inner peripheral edge of a portion excluding the pair of ears facing the external force. The increase in the spring constant caused by the above is offset by the decrease in the spring constant caused by bringing the center of the arc formed by the inner peripheral edge closer to the center of the arc formed by the outer peripheral edge. The spring constant when a force facing the pair of ears is applied is the same as 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 method for designing a snap ring for locking a shaft sealing member provided in a housing through portion of a drive shaft of an air conditioning compressor to a housing, comprising a pair of opposed ears for applying an external force. A snap ring in which the inner periphery of the part excluding the part forms a single arc, and then three or more diameters are formed on the inner periphery of the part excluding a pair of opposing ears for applying an external force of the snap ring. The convex portion is added until the spring constant when a force facing the pair of ears is applied is equal to the spring constant of the snap ring whose inner peripheral edge forms a single arc. A method of designing a snap ring, characterized in that the center of the arc formed by the inner peripheral edge of the snap ring is made closer to the center of the arc formed by the outer peripheral edge. According to the above design method, it is possible to design a snap ring having a higher ability to lock the shaft sealing member to the housing as compared with the snap ring of the conventional structure, and having the same workability at the time of mounting as the snap ring of the conventional structure. it can.

[0007]

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, and form 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 A lip seal 13 is provided in a front housing penetrating portion of the drive shaft 4. A snap ring 14 for locking the lip seal 13 to the front housing 11 is disposed adjacent to the lip seal 13. The snap ring 14 is attached to the front housing 11.
And is engaged with the front housing 11 while being fitted in the annular groove 11 a formed in the front housing 11. Lip seal 13
Is held between the step portion 11b of the front housing 11 located inside the lip seal 13 and the snap ring 14 located outside the lip seal 13 and is locked to the front housing 11.

[0008] As shown in FIG.
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 away to form a pair of opposed ear portions 14c for applying an external 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
Are eccentric in the direction of the center C of the cutout portion with respect to the center Oout of the arc formed by. Three or more radial protrusions 14e are formed on the inner peripheral edge 14b of the snap ring 14 except for the pair of ears 14c, and the radial protrusions 14e are formed.
, A radial recess 14 f is formed in the outer peripheral edge 14 a of the snap ring 14. The radial recess 14f forms a smooth curve. The snap ring 14 passes a jig for applying an external force through the hole 14d of the pair of ears 14c,
An external force is applied to the pair of ears 14c via the jig, and the pair of ears 14c is deformed in a direction approaching each other as shown by a white arrow in FIG. 4 is inserted into the front housing through portion, the external force is released, the original shape is restored, and the front shape is fitted to the annular groove 11a, whereby the front housing 11 is locked.

In the snap ring 14, a pair of ears 14c and three or more radial protrusions 14e formed on the inner peripheral edge 14b of the portion excluding the pair of opposing ears 14c have a sufficient diameter. Since the lip seal 13 contacts the lip seal 13 with a directional contact width, even when the internal pressure of the crank chamber 12 is high, the lip seal 13, which is a flexible rubber product, gets over the snap ring 14 and deforms outward of the front housing 11. Can not. Therefore, the snap ring 14 attaches the lip seal 13 to the front housing 11.
Is higher than the conventional structure of the snap ring shown in FIG. In the snap ring 14, three or more radial projections 14e are formed on the inner peripheral edge 14b of the part excluding the pair of ears 14c facing each other, so that a force facing the pair of ears 14c is applied. The increase in the spring constant is caused by the outer peripheral edge
Since the spring constant is reduced by forming the radial recess 14f in the snap ring 4a, the snap ring 1
4, the spring constant when a force opposing the pair of ears 14c is applied is the same as that of the snap ring of the conventional structure shown in FIG. Therefore, the workability at the time of mounting the snap ring 14 is equivalent to the snap ring of the conventional structure shown in FIG. Since the radial recess 14f forms a smooth curve, stress concentration does not occur.

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. Three or more radial projections 24e are formed on the inner peripheral edge of the snap ring 24 except for the pair of ears 24a.

The shape of the snap ring 24 is designed according to the following procedure. First, a snap ring having a conventional structure shown in FIG. 1 was designed in which the inner peripheral edge of a portion excluding a pair of opposing ears for applying an external force forms a single arc, and then a pair of ears of the snap ring were removed. Three or more radial projections 24e are added to the inner peripheral edge of the part, and then a pair of ears 2
4c until the spring constant becomes equal to the previously designed snap ring of the conventional structure, the inner peripheral edge 24 of the snap ring with the radial projection 24e added.
The center Oint of the arc formed by b is made closer to the center Oout of the arc formed by the outer peripheral edge 24a on a line connecting the center Oout of the arc formed by the outer peripheral edge 24a and the center C of the notch. The snap ring 24 is
Instead, it is mounted on the swash plate compressor for air conditioning shown in FIG.

In the snap ring 24, a pair of ears 24c and three or more radial protrusions 24e formed on the inner peripheral edge 24b of the portion excluding the pair of ears 24c facing each other have a sufficient diameter. Since the lip seal 13 contacts the lip seal 13 with a directional contact width, even when the internal pressure of the crank chamber 12 is high, the lip seal 13, which is a flexible rubber product, gets over the snap ring 24 and deforms outward from the front housing 11. Can not. Therefore, the snap ring 24 attaches the lip seal 13 to the front housing 11.
Is higher than the conventional structure of the snap ring shown in FIG. In the snap ring 24, three or more radial projections 24e are formed on the inner peripheral edge 24b of the part excluding the pair of ears 24c facing each other, so that a force facing the pair of ears 24c is applied. The increase in the spring constant depends on the center O of the arc formed by the inner peripheral edge 24b.
Int is brought closer to the center Oout of the arc formed by the outer peripheral edge 24a, and offset by the decrease in the spring constant caused by reducing the radial thickness at the central portion in the longitudinal direction along the circumference. The spring constant when a force facing the pair of ears 24c is applied is the same as 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.

In the above embodiment, the snap ring according to the present invention is applied to a swash plate type compressor for air conditioning. However, the snap ring according to the present invention is applied to another type of air conditioning compressor such as a scroll compressor for air conditioning. Is also applicable.

[0014]

In the snap ring according to the present invention, a pair of ears and a plurality of three or more radial protrusions formed on the inner peripheral edge of the portion excluding the pair of opposite ears for applying an external force are provided. However, since the shaft sealing member contacts the shaft sealing member with a sufficient radial contact width, even if the shaft sealing member is a flexible rubber product, the shaft sealing member under a high housing internal pressure moves outward from the housing over the snap ring. Deformation 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. In the snap ring according to the present invention, a force facing the pair of ears is applied by forming three or more radial protrusions on the inner peripheral edge of a portion excluding the pair of ears facing the external force. The increase in the spring constant at the time of the offset is offset by the decrease in the spring constant by forming a radial concave portion on the outer peripheral edge facing the convex portion. The spring constant when a force facing the part is applied is equivalent 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 three or more radial protrusions formed on the inner peripheral edge of the part excluding the pair of opposing ears for applying external force are formed on the shaft sealing member with a sufficient radial contact width. The abutment 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. In the snap ring according to the present invention, a force facing the pair of ears is applied by forming three or more radial protrusions on the inner peripheral edge of a portion excluding the pair of ears facing the external force. The increase in the spring constant caused by the above is offset by the decrease in the spring constant caused by bringing the center of the arc formed by the inner peripheral edge closer to the center of the arc formed by the outer peripheral edge. The spring constant when a force facing the pair of ears is applied is the same as 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.

[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 snap ring 14a, 24a outer peripheral edge 14b, 24b inner peripheral edge 14c, 24c ear 14e , 24e Radial projection 14f 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, excluding a pair of opposed ear portions for applying an external force. A snap ring, wherein three or more radial protrusions are formed on an inner peripheral edge, and a radial recess is formed on an outer peripheral edge to face the radial protrusion. 2. A snap ring for locking a shaft sealing member provided in a housing through portion of a drive shaft of an air-conditioning compressor to a housing, wherein the snap ring has a portion excluding a pair of opposed ear portions for applying an external force. Three or more radial projections are formed on the inner peripheral edge, and the inner peripheral edge of a portion excluding the pair of ears is a snap ring forming a single arc, and a force facing the pair of ears is provided. A snap ring, wherein a center of an arc formed by an inner peripheral edge is closer to a center of an arc formed by an outer peripheral edge, as compared with a snap ring having the same spring constant when applied. 3. A method for designing a snap ring for locking a shaft sealing member provided in a housing penetration part of a drive shaft of an air conditioning compressor to a housing, excluding a pair of opposed ears for applying an external force. A snap ring whose inner peripheral edge forms a single arc, and then three or more radial projections on the inner peripheral edge of the snap ring except for a pair of opposing ears for applying an external force. Is added, and then a spring constant when a force facing the pair of ears is applied,
Until the inner peripheral edge becomes equal to the spring constant of the snap ring that forms a single arc, the center of the arc formed by the inner peripheral edge of the snap ring with the projection is brought closer to the center of the arc formed by the outer peripheral edge. A method of designing a snap ring, characterized in that it is performed.