compressor

Abstract

Provided is a compressor. The compressor includes a piston structure including a guide member that reciprocates in an axial direction inside a cylinder, and a magnet frame that supports a moving member that moves together with the piston structure. The piston structure includes the guide member, a mounting member connected to the magnet frame, and an elastic member that can be elastically deformed and is disposed between the guide member and the mounting member. The guide member further includes a first coupling portion that is coupled to an inner circumferential surface of the elastic member, and the mounting member further includes a second coupling portion that is coupled to an outer circumferential surface of the elastic member.

Description

[0001] This application is a divisional application of Chinese Patent Application No. 202011045052.2, filed on September 29, 2020, entitled "Linear Compressor". Technical Field

[0002] This invention relates to compressors. More specifically, it relates to a linear compressor that uses the linear reciprocating motion of a piston to compress a refrigerant. Background Technology

[0003] Generally speaking, a compressor is a device that receives power from a power-generating device such as a motor or turbine and compresses working fluids such as air or refrigerant. Compressors are widely used in various industrial sectors and household appliances, especially in vapor compression refrigeration cycles (hereinafter referred to as "refrigeration cycles").

[0004] Based on the way the refrigerant is compressed, such compressors can be classified as reciprocating compressors, rotary compressors, and scroll compressors.

[0005] A reciprocating compressor is a type of compressor that compresses fluid by creating a compression space between a piston and a cylinder, and by having the piston reciprocate linearly. A rotary compressor is a type of compressor that compresses fluid by using rollers that rotate eccentrically inside the cylinder. A scroll compressor is a type of compressor that compresses fluid by having a pair of spiral-shaped scrolls that interlock and rotate together.

[0006] Recently, the use of linear compressors, which utilize linear reciprocating motion instead of a crankshaft, has been gradually increasing. Linear compressors offer advantages such as improved efficiency and a simpler structure because they involve less mechanical loss during the conversion of rotary motion to linear reciprocating motion.

[0007] A linear compressor mechanism consists of a cylinder arranged inside a housing that forms a sealed space to create a compression chamber, and a piston covering the compression chamber reciprocating inside the cylinder. The linear compressor repeatedly performs the following process: when the piston is at bottom dead center (BDC), fluid in the sealed space is drawn into the compression chamber; when the piston is at top dead center (TDC), the fluid in the compression chamber is compressed and expelled.

[0008] The linear compressor contains a compression unit and a drive unit. Under the action of movement in the drive unit, the compression unit uses a resonant spring to perform resonant motion and execute the process of compressing and discharging refrigerant.

[0009] A linear compressor repeatedly performs the following series of processes: the piston reciprocates at high speed inside the cylinder using a resonant spring, and during this process, the refrigerant is drawn into the interior of the casing through the suction pipe, and then discharged from the compression space by the forward motion of the piston and moves towards the condenser through the discharge pipe.

[0010] Reference Figure 2 When piston misalignment occurs, the piston reciprocates inside the cylinder in an eccentric or tilted state. When the piston contacts the cylinder, wear occurs on both the piston and cylinder, causing particles, which can lead to damage due to fatigue accumulation. To prevent this, a flexible structure needs to be used in the moving part of the piston to reduce the magnitude of the contact pressure.

[0011] U.S. Patent Publication No. 9534591 B, as prior art, aims to solve this problem by inserting a flexible rod along the length of the piston inside. However, the flexible rod still suffers from the problem of loss of its flexible function due to fatigue failure caused by repeated application of external forces.

[0012] In addition, it is suggested that using a joint to connect the piston is intended to solve this problem. However, with joints, lubricant is required depending on the operating conditions, thus increasing manufacturing costs. Furthermore, the problem of loss of function of the flexible structure due to loosening gaps caused by increased fatigue still exists.

[0013] Prior art literature

[0014] (Patent Document 1) US Patent Publication No. 9534591 B2 (Published on February 3, 2017) Summary of the Invention

[0015] The purpose of this specification is to provide a compressor that, by adding a fatigue-resistant, flexible structure to the piston and cylinder assembly, can achieve piston alignment using only the pressure generated in the lubrication surface, thereby preventing the piston from contacting the inner wall of the cylinder or reducing the contact pressure acting on the piston, thus improving compression reliability.

[0016] A compressor according to one embodiment of this specification may include: a piston structure including a guide member that reciprocates along an axial direction inside a cylinder; and a magnet frame supporting a drive portion that drives the piston structure (or a magnet frame supporting a movable member that moves together with the piston structure), the piston structure including: the guide member; a mounting member connected to the magnet frame; and an elastic member disposed between the guide member and the mounting member, and capable of elastic deformation.

[0017] Furthermore, the elastic member may be configured as a ring or a portion of a ring, with the outer peripheral surface of the elastic member engaging with one of the guide member and the mounting member, and the inner peripheral surface of the elastic member engaging with the other of the guide member and the mounting member.

[0018] Furthermore, the guide member may include: a cylindrical guide portion; a head disposed in front of the guide portion and compressing the compression space inside the cylinder; and a first connecting portion disposed behind the guide portion and connecting to the inner circumferential surface of the elastic member.

[0019] At this time, the mounting component may include: a mounting component body portion that surrounds all or part of the elastic component; a frame connecting portion that extends in the outer radial direction of the mounting component body portion and is connected to the magnet frame; and a second connecting portion that is disposed on the inner circumferential surface of the mounting component body portion.

[0020] At this time, an inner connecting portion that engages with the first connecting portion of the guide member may be provided on the inner circumferential surface of the elastic member, and an outer connecting portion that engages with the second connecting portion of the mounting member body portion may be provided on the outer circumferential surface of the elastic member.

[0021] The guide member may include: a cylindrical guide portion; a head disposed in front of the guide portion and compressing the compression space inside the cylinder; and a first connecting portion formed on the inner circumferential surface of the guide portion and connected to the outer circumferential surface of the elastic member.

[0022] The mounting component may include: a support plate connected to the magnet frame; a mounting component extension extending forward from the support plate and housed inside the guide portion; and a second connecting portion disposed on the outer peripheral surface of the mounting component extension and connected to the inner peripheral surface of the elastic component.

[0023] The rear end of the guide member can be configured separately from the support plate.

[0024] Furthermore, an outer connecting portion that engages with the first connecting portion of the guide member may be provided on the outer peripheral surface of the elastic member, and an outer connecting portion that engages with the second connecting portion of the extension of the mounting member may be provided on the inner peripheral surface of the elastic member.

[0025] Furthermore, the present invention may also include a muffler structure located behind the piston structure and having a conduit through which refrigerant drawn in from the suction pipe passes. The support plate is disposed between the guide member and the muffler structure and has a first through hole to allow refrigerant from the muffler structure to flow into the suction space inside the guide member.

[0026] Furthermore, the extension of the mounting member can be configured as a rod, and the outer peripheral surface of the extension of the mounting member includes a connecting plate having a second connecting portion that engages with the inner peripheral surface of the elastic member.

[0027] The connecting plate may be provided with a second through hole so that the refrigerant drawn into the guiding member passes through the second through hole.

[0028] Furthermore, the extension of the mounting member can be configured as a tube with its interior penetrated, and a second connecting portion is provided on the outer peripheral surface of the extension of the mounting member, which engages with the inner peripheral surface of the elastic member.

[0029] Furthermore, the elastic member can be configured as an annular shape, with an outer connecting portion formed along the circumferential direction on the outer peripheral surface of the elastic member, and an inner connecting portion formed along the circumferential direction on the inner peripheral surface of the elastic member. The outer connecting portion includes an outer connecting groove or an outer connecting protrusion that connects to one of the guide member and the mounting member, and the inner connecting portion includes an inner connecting groove or an inner connecting protrusion that connects to the other of the guide member and the mounting member.

[0030] At this time, an inner sliding passage that allows the connecting protrusion formed by one of the guide member and the mounting member to pass through can be formed on an inner boss located on one side of the inner connecting groove of the elastic member, or a sliding passage that allows the outer connecting protrusion of the elastic member to pass through can be formed on a boss located on one side of the connecting groove of the other of the guide member and the mounting member.

[0031] Furthermore, a sliding channel that allows the engagement protrusion formed on the inner circumferential surface of the guide member and the mounting member to pass through can be formed on an outer boss located on one side of the outer engagement groove of the elastic member, or a sliding channel that allows the outer engagement protrusion of the elastic member to pass through can be formed on a boss located on one side of the engagement groove formed on the inner circumferential surface of the guide member and the mounting member.

[0032] Furthermore, the elastic member may be provided with an inner sliding channel and an inner stop (first stop). The inner sliding channel is formed on an inner boss located on one side of the inner engagement groove, and allows a first engagement protrusion formed on the outer peripheral surface of one of the guide member and the mounting member to pass through the inner sliding channel. The inner stop (first stop) protrudes from the inner engagement groove and prevents the first engagement protrusion from rotating. Alternatively, the elastic member may be provided with an outer sliding channel and an outer stop (second stop). The outer sliding channel is formed on an outer boss located on one side of the outer engagement groove, and allows a second engagement protrusion formed on the inner peripheral surface of the other of the guide member and the mounting member to pass through the outer sliding channel. The outer stop (second stop) protrudes from the outer engagement groove and prevents the second engagement protrusion from rotating.

[0033] Furthermore, the elastic member allows the guide member to deform in accordance with the radial tilt and the rotational rotation.

[0034] The elastic member can be made of rubber with a Shore hardness of 30 or higher.

[0035] Furthermore, the elastic member may have the outer connecting groove and the inner connecting groove, wherein the width of the outer connecting groove is configured to be at least 1.5 times the depth of the outer connecting groove, and the width of the inner connecting groove is configured to be at least 1.5 times the depth of the inner connecting groove. Attached Figure Description

[0036] Figure 1 This is a sectional view used to illustrate the structure of the compressor.

[0037] Figure 2 This is a diagram showing the piston contacting the cylinder.

[0038] Figure 3 This is a perspective view of the piston in a comparative embodiment.

[0039] Figure 4 This is a perspective view showing the engagement of the piston in the comparative embodiment in cross-section.

[0040] Figure 5This is a perspective view of the piston in the first embodiment.

[0041] Figure 6 yes Figure 5 An exploded 3D diagram.

[0042] Figure 7 This is a perspective view showing the engagement of the piston in the first embodiment in cross-section.

[0043] Figure 8 This is a diagram showing the assembly of the bushing members in a modified embodiment of the first embodiment.

[0044] Figure 9 This is a perspective view showing the engagement of the piston in the second embodiment in cross-section.

[0045] Figure 10 This is a diagram showing the assembly of the bushing members in a modified embodiment of the second embodiment.

[0046] Figure 11 This is a perspective view showing the assembly of the piston in the third embodiment in cross-section. Detailed Implementation

[0047] Hereinafter, the embodiments disclosed in this specification will be described in detail with reference to the accompanying drawings. Unless otherwise specified in the drawings, the same or similar structural elements will be given the same reference numerals, and repeated descriptions of them will be omitted.

[0048] In describing the embodiments disclosed in this specification, if it is mentioned that a structural element is "connected" or "in contact" with another structural element, it may be directly connected to or in contact with the other structural element, but it can be understood that there are other structural elements between them.

[0049] Furthermore, in describing the embodiments disclosed in this specification, if it is determined that a specific description of related well-known technologies may affect the technical spirit of the embodiments disclosed in this specification, a detailed description of those technologies will be omitted. Moreover, the accompanying drawings are only for ease of understanding of the embodiments disclosed in this specification. The technical concepts disclosed in this specification are not limited to the accompanying drawings, but should be understood to cover all modifications, equivalents, and even substitutions included within the scope of the present invention.

[0050] Figure 1 This is a sectional view used to illustrate the structure of compressor 100.

[0051] The following description uses a linear compressor, which is an actuator that performs linear reciprocating motion of the piston and draws in fluid, compresses it, and then discharges the compressed fluid, as an example.

[0052] A linear compressor can be a structural component of a refrigeration cycle, and the fluid compressed in the linear compressor can be the refrigerant circulating in the refrigeration cycle. Besides the compressor, a refrigeration cycle also includes a condenser, an expansion unit, and an evaporator. While the linear compressor can be used as a structural component of a refrigerator's cooling system, this invention is not limited to this and can be widely used throughout industry.

[0053] Reference Figure 1 The compressor 100 may include: a housing 110; a body housed inside the housing 110, the body including a frame 120, a cylinder 140 fixed to the frame 120, a piston 150 reciprocating linearly inside the cylinder 140, and a drive unit 130 fixed to the frame 120 and providing driving force to the piston 150, etc. The cylinder 140 and piston 150 may also be referred to as compression units 140 and 150.

[0054] The compressor 100 may be equipped with a bearing unit to reduce friction between the cylinder 140 and the piston 150. The bearing unit may be an oil bearing or a gas bearing. Alternatively, a mechanical bearing may be used as the bearing unit.

[0055] The compressor body 100 can be elastically supported by support springs 116 and 117 provided on both ends of the inner side of the outer casing 110. The support springs include a first support spring 116 supporting the rear of the body and a second support spring 117 supporting the front of the body, and can be composed of leaf springs. The support springs 116 and 117 support the internal components of the body and can absorb the vibration and impact generated by the reciprocating motion of the piston 150.

[0056] The outer casing 110 can form a sealed space, which forms a receiving space 101 for holding the drawn-in refrigerant, a suction space 102 for filling the refrigerant before compression, a compression space 103 for compressing the refrigerant, and a discharge space 104 for filling the compressed refrigerant.

[0057] That is, the refrigerant drawn in from the suction pipe 114 connected to the rear side of the housing 110 fills the accommodating space 101. The refrigerant in the suction space 102, which is connected to the accommodating space 101, is compressed in the compression space 103 and discharged into the discharge space 104, and discharged to the outside through the discharge pipe 115 connected to the front side of the housing 110.

[0058] The outer casing 110 may include: a casing 111, which is open at both ends and formed into a generally transversely elongated cylindrical shape; a first casing cover 112, attached to the rear side of the casing 111; and a second casing cover 113, attached to the front side of the casing 111. The front side indicates the direction in which compressed refrigerant is discharged to the left of the drawing, and the rear side indicates the direction in which refrigerant flows into the right of the drawing. Furthermore, the first casing cover 112 or the second casing cover 113 may be integrally formed with the casing 111.

[0059] The outer casing 110 can be made of a thermally conductive material. This structure allows heat generated inside the casing 110 to be quickly dissipated to the outside.

[0060] The first housing cover 112 is attached to the housing 111 in a manner that seals the rear side of the housing 111, and the suction tube 114 can be inserted into the center of the first housing cover 112 for attachment.

[0061] In addition, the rear side of the compressor body can be elastically supported in the radial direction by the first support spring 116 on the first housing cover 112.

[0062] The first support spring 116 may be made of a circular leaf spring, the edge of which may be supported in the front direction by the support bracket 123a on the rear cover 123, and the open central part of which may be supported in the rear direction by the suction guide 116a on the first housing cover 112.

[0063] The suction guide 116a is formed into a cylindrical shape with a through flow path inside. The suction guide 116a may have a central opening of the first support spring 116 attached to its front outer peripheral surface, and its rear end supported by the first housing cover 112. At this time, an additional suction-side support member 116b may be sandwiched between the suction guide 116a and the inner surface of the first housing cover 112.

[0064] The rear side of the intake guide 116a is connected to the intake pipe 114, and the refrigerant drawn in through the intake pipe 114 can flow smoothly through the intake guide 116a and into the muffler unit 160 described later.

[0065] A damping member 116c made of rubber or the like can be provided between the intake guide 116a and the intake-side support member 116b. This can prevent vibrations that may occur during the intake of refrigerant through the intake pipe 114 from being transmitted to the first housing cover 112.

[0066] The second housing cover 113 is attached to the housing 111 in a manner that seals the front side of the housing 111, and is connected to the discharge pipe 115 by inserting an annular pipe 115a. The refrigerant discharged from the compression space 103, after passing through the discharge cover assembly 180, can be discharged into the refrigeration cycle through the annular pipe 115a and the discharge pipe 115.

[0067] The front side of the compressor body can be elastically supported in the radial direction by the second support spring 117 to the housing 111 or the second housing cover 113.

[0068] The second support spring 117 may be a circular leaf spring, with its open central portion supported in the rearward direction by the first support guide 117b on the ejector cap assembly 180, and its edge portion supported in the radial direction by the support bracket 117a on the inner side of the housing 111 or the inner circumferential surface of the housing 111 adjacent to the second housing cover 113. Alternatively, unlike the accompanying drawings, the edge portion of the second support spring 117 may be supported in the frontward direction by a bracket (not shown) on the second housing cover 113.

[0069] The first support guide 117b can be formed as a continuous cylindrical shape with different diameters, its front side inserted into the central opening of the second support spring 117, and its rear side inserted into the central opening of the ejector cap assembly 180. The support cap 117c can be coupled to the front side of the first support guide 117b by providing the second support spring 117 between it and the first support guide 117b. Furthermore, a cup-shaped second support guide 117d, recessed forward, can be coupled to the front side of the support cap 117c, and a cup-shaped third support guide 117e, corresponding to the second support guide 117d and recessed rearward, can be coupled to the inner side of the second housing cover 113. The second support guide 117d can be inserted into the inner side of the third support guide 117e and supported in both the axial and radial directions. At this time, a gap can be formed between the second support guide 117d and the third support guide 117e.

[0070] The frame 120 includes: a main body 121 that supports the outer peripheral surface of the cylinder 140; and a flange 122 that is connected to one side of the main body 121 and supports the drive unit 130. The frame 120, together with the drive unit 130 and the cylinder 140, can be supported on the housing 110 by the elastic force of a first support spring 116 and a second support spring 117.

[0071] The main body 121 can be formed into a cylindrical shape that surrounds the outer peripheral surface of the cylinder 140, and the flange 122 extends from the front end of the main body 121 along the radial direction.

[0072] A cylinder 140 may be attached to the inner circumferential surface of the main body 121, and an inner stator 134 may be attached to the outer circumferential surface of the main body 121. For example, the cylinder 140 may be press-fitted into the inner circumferential surface of the main body 121 for fixation, and the inner stator 134 may be fixed by means of a retaining ring.

[0073] An outer stator 131 may be attached to the rear side of the flange portion 122, and a discharge cap assembly 180 may be attached to the front side of the flange portion 122. For example, the outer stator 131 and the discharge cap assembly 180 may be fixed by a mechanical coupling unit.

[0074] A bearing inlet groove 125a, which forms part of the gas bearing, can be formed on one side of the front surface of the flange portion 122, and a bearing communication hole 125b is formed that extends from the bearing inlet groove 125a to the inner peripheral surface of the main body portion 121. A gas groove 125c that communicates with the bearing communication hole 125b is formed on the inner peripheral surface of the main body portion 121.

[0075] The bearing inlet groove 125a can be formed by recessing in the axial direction to a predetermined depth, and the bearing connecting hole 125b is formed inclined towards the inner circumferential surface of the main body 121 as a hole with a cross-sectional area smaller than that of the bearing inlet groove 125a. The gas groove 125c can be formed in an annular shape with a predetermined depth and axial length on the inner circumferential surface of the main body 121. In contrast, the gas groove 125c can be formed on the outer circumferential surface of the cylinder 140 that contacts the inner circumferential surface of the main body 121, or both can be formed on the inner circumferential surface of the main body 121 and the outer circumferential surface of the cylinder 140.

[0076] Furthermore, a gas inlet 142 corresponding to the gas groove 125c can be formed on the outer peripheral surface of the cylinder 140. The gas inlet 142 constitutes a nozzle portion in the gas bearing.

[0077] In addition, the frame 120 and cylinder 140 can be made of aluminum or aluminum alloy.

[0078] The cylinder 140 can be formed into a cylindrical shape with open ends. The piston 150 is inserted through the rear end of the cylinder 140, and the front end is closed by the discharge valve assembly 170. A compression space 103 can be formed, surrounded by the cylinder 140, the front end (head, 151) of the piston 150, and the discharge valve assembly 170. The volume of the compression space 103 increases when the piston 150 retracts and decreases when the piston 150 advances. That is, the refrigerant flowing into the compression space 103 can be compressed as the piston 150 advances and discharged through the discharge valve assembly 170.

[0079] The cylinder 140 can be bent outward from its front end to form a flange 141. The flange 141 of the cylinder 140 can be attached to the frame 120. For example, the front end of the frame 120 can be formed with a flange groove corresponding to the flange 141 of the cylinder 140, and the flange 141 of the cylinder 140 can be inserted into the flange groove and attached by a mechanical coupling member.

[0080] Additionally, a gas bearing unit can be provided to supply exhaust gas between the outer peripheral surfaces of the piston 150 and the cylinder 140, thereby enabling gas lubrication between the cylinder 140 and the piston 150. The exhaust gas between the cylinder 140 and the piston 150 provides a levitation force to the piston 150, thereby reducing friction between the piston 150 and the cylinder 140.

[0081] For example, a gas inlet 142 may be formed in the cylinder 140, which communicates with a gas groove 125c formed on the inner circumferential surface of the main body 121. Compressed refrigerant that penetrates the cylinder 140 radially and flows into the gas groove 125c is guided between the inner circumferential surface of the cylinder 140 and the outer circumferential surface of the piston 150. Alternatively, for ease of processing, the gas groove 125c may also be formed on the outer circumferential surface of the cylinder 140.

[0082] The gas inlet 142 can be formed as a micro-perforation, so that its inlet is relatively wide and its outlet functions as a nozzle. A filter (not shown) to cut off the flow of impurities can be additionally provided at the inlet of the gas inlet 142. The filter can be a mesh filter made of metal, or it can be formed by winding a component such as fine wire.

[0083] The gas inlet 142 can be formed independently in multiple ways, or its inlet can be formed as an annular groove, and its outlet can be formed in multiple ways along the annular groove at predetermined intervals.

[0084] Furthermore, the gas inlet 142 can be formed only on the front side with the axial direction of the cylinder 140 as a reference, or it can be formed on the rear side with the piston 150 drooping down as well.

[0085] The piston 150 is configured to be inserted into the open end of the cylinder 140, thereby sealing the rear of the compression space 103.

[0086] The piston 150 can be shaped to correspond to the shape of the inner circumferential surface of the cylinder 140, thereby enabling it to reciprocate inside the cylinder 140.

[0087] As an example, the piston 150 may be configured in a cylindrical shape.

[0088] Piston 150 includes: a head 151, which is disc-shaped and divides the compression space 103; and a cylindrical guide 152 that extends rearward from the outer periphery of the head 151.

[0089] The head 151 can be configured to be partially open, with the guide portion 152 configured to be empty inside. Although the front of the guide portion 152 is partially sealed by the head 151, the rear of the guide portion 152 is open and connected to the muffler unit 160. The head 151 can be formed by additional components combined with the guide portion 152, or the head 151 and the guide portion 152 can be formed integrally.

[0090] A suction port 154 is formed through the head 151 of the piston 150. The suction port 154 is configured to connect the suction space 102 and the compression space 103 inside the piston 150. For example, refrigerant flowing from the accommodating space 101 into the suction space 102 inside the piston 150 can be drawn into the compression space 103 between the piston 150 and the cylinder 140 through the suction port 154.

[0091] The intake port 154 may extend along the axial direction of the piston 150. Alternatively, the intake port 154 may be formed obliquely with respect to the axial direction of the piston 150. For example, the intake port 154 may extend in an oblique direction away from the central axis as it approaches the rear of the piston 150.

[0092] The opening of the suction port 154 can be formed as a circle, and its inner diameter is formed constantly. Alternatively, the opening of the suction port 154 can be formed as an elongated hole extending in the radial direction of the head 151, and its inner diameter is formed larger as it approaches the rear.

[0093] The suction port 154 can be formed in multiple directions along one or more of the radial and circumferential directions of the head 151.

[0094] Furthermore, a suction valve 155 that selectively opens and closes the suction port 154 can be installed on the head 151 of the piston 150 adjacent to the compression space 103. The suction valve 155 can operate by elastic deformation to open or close the suction port 154. That is, the suction valve 155 can elastically deform and open the suction port 154 by the pressure of the refrigerant flowing into the compression space 103 through the suction port 154.

[0095] Furthermore, the piston 150 is connected to the movable member 135, which reciprocates in the front-to-back direction as the piston 150 moves. An inner stator 134 and a cylinder 140 may be arranged between the movable member 135 and the piston 150.

[0096] The piston 150 can be connected to the magnet frame 136 on which the movable element 135 is provided.

[0097] That is, the moving part 135 and the piston 150 can be connected to each other by a magnet frame 136 formed by the rearwardly detour cylinder 140 and the inner stator 134.

[0098] The muffler unit 160 is attached to the rear of the piston 150 and is configured to attenuate the noise generated during the process of drawing refrigerant into the piston 150. The refrigerant drawn in through the suction pipe 114 passes through the muffler unit 160 and flows into the suction space 102 inside the piston 150.

[0099] The muffler unit 160 includes: an intake muffler 161 communicating with the accommodating space 101 of the housing 110; and an internal guide 162 connected to the front of the intake muffler 161 and guiding the refrigerant to the intake port 154.

[0100] The intake muffler 161 can be located behind the piston 150. The opening on the rear side of the intake muffler 161 is arranged adjacent to the intake pipe 114, and the front end of the intake muffler 161 is connected to the rear of the piston 150. The intake muffler 161 can have a flow path formed in the axial direction, thereby guiding the refrigerant in the accommodating space 101 to the intake space 102 inside the piston 150.

[0101] At this time, the interior of the intake muffler 161 can form multiple noise spaces divided by baffles. The intake muffler 161 can be formed by combining two or more components together; for example, a second intake muffler can be pressed into the interior of a first intake muffler to form multiple noise spaces. The intake muffler 161 can be made of plastic material to take into account weight or insulation.

[0102] The internal guide 162 may be a tube-shaped component with one side connected to the noise space of the intake muffler 161 and the other side deeply inserted into the interior of the piston 150. The internal guide 162 may be formed into a cylindrical shape with the same inner diameter at both ends, but depending on the circumstances, the inner diameter of the front end, which is the discharge side, may be larger than the inner diameter of the rear end, which is the opposite side.

[0103] The intake muffler 161 and the internal guide 162 can be configured in various shapes, and the pressure of the refrigerant passing through the muffler unit 160 can be regulated through these structural elements. Furthermore, the intake muffler 161 and the internal guide 162 can be integrally formed.

[0104] The discharge valve assembly 170 may include: a discharge valve 171; and a valve spring 172, disposed in front of the discharge valve 171 and elastically supporting the discharge valve 171. The discharge valve assembly 170 can selectively discharge the compressed refrigerant in the compression space 103. The compression space 103 can be understood as the space formed between the suction valve 155 and the discharge valve 171.

[0105] Discharge valve 171 can be supported on the front surface of cylinder 140 and configured to selectively open and close the front opening of cylinder 140. Discharge valve 171 can operate by elastic deformation to open or close compression space 103. Discharge valve 171 can elastically deform and open compression space 103 by the pressure of refrigerant flowing through compression space 103 to discharge space 104. For example, when discharge valve 171 is supported on the front surface of cylinder 140, compression space 103 remains closed; when discharge valve 171 is separated from the front surface of cylinder 140, compressed refrigerant in compression space 103 can be discharged into the open space.

[0106] A valve spring 172 is provided between the discharge valve 171 and the discharge cover assembly 180, and provides spring force in the axial direction. The valve spring 172 may be a compression coil spring, or a leaf spring, depending on space or reliability considerations.

[0107] When the pressure in the compression chamber 103 reaches or exceeds the discharge pressure, the valve spring 172 deforms forward and opens the discharge valve 171, allowing refrigerant to be discharged from the compression chamber 103 and into the first discharge chamber 103a of the discharge cover assembly 180. Furthermore, when the refrigerant discharge is complete, the valve spring 172 provides a restoring force to the discharge valve 171, thereby closing the discharge valve 171.

[0108] The process of refrigerant flowing into the compression space 103 through the suction valve 155 and refrigerant being discharged from the compression space 103 into the discharge space 104 through the discharge valve 171 is described below.

[0109] During the reciprocating linear motion of the piston 150 inside the cylinder 140, when the pressure in the compression space 103 falls below the preset suction pressure, the suction valve 155 opens, allowing refrigerant to be drawn into the compression space 103. Conversely, when the pressure in the compression space 103 exceeds the preset suction pressure, the refrigerant in the compression space 103 is compressed while the suction valve 155 is closed.

[0110] Additionally, when the pressure in the compression space 103 reaches or exceeds the preset discharge pressure, the valve spring 172 deforms forward, opening the connected discharge valve 171, allowing refrigerant to be discharged from the compression space 103 into the discharge space 104 of the discharge cover assembly 180. When the refrigerant discharge is complete, the valve spring 172 provides a restoring force to the discharge valve 171, closing the discharge valve 171 and sealing the front of the compression space 103.

[0111] The discharge cap assembly 180 is positioned in front of the compression chamber 103, thereby forming a discharge chamber 104 that accommodates the refrigerant discharged from the compression chamber 103. The discharge cap assembly 180 is coupled to the front of the frame 120, thereby reducing the noise generated during the discharge of refrigerant from the compression chamber 103. The discharge cap assembly 180 can accommodate the discharge valve assembly 170 and is coupled to the front of the flange 122 of the frame 120. For example, the discharge cap assembly 180 can be coupled to the flange 122 by a mechanical coupling member.

[0112] A heat-insulating gasket 165 and an O-ring 166 for preventing refrigerant leakage from the discharge space 104 may be provided between the discharge cap assembly 180 and the frame 120.

[0113] The discharge cap assembly 180 can be made of a thermally conductive material. Thus, when high-temperature refrigerant flows into the discharge cap assembly 180, the heat of the refrigerant is transferred through the discharge cap assembly 180 to the outer casing 110, thereby dissipating heat to the outside of the compressor.

[0114] The dispensing cap assembly 180 can consist of a single dispensing cap or multiple dispensing caps arranged in a sequentially connected manner. When multiple dispensing caps are provided, the dispensing space 104 can include multiple spatial portions divided by each dispensing cap. These multiple spatial portions are arranged along the front-back direction and are interconnected.

[0115] For example, when there are three dispensing caps, the dispensing space 104 may include: a first dispensing space 103a, formed between the first dispensing cap 181 attached to the front side of the frame 120 and the frame 120; a second dispensing space 103b, connected to the first dispensing space 103a, and formed between the second dispensing cap 182 attached to the front side of the first dispensing cap 181 and the first dispensing cap 181; and a third dispensing space 103c, connected to the second dispensing space 103b, and formed between the third dispensing cap 183 attached to the front side of the second dispensing cap 182 and the second dispensing cap 182.

[0116] The first discharge space 103a can be selectively connected to the compression space 103 via the discharge valve 171, the second discharge space 103b is connected to the first discharge space 103a, and the third discharge space 103c is connected to the second discharge space 103b. Thus, the refrigerant discharged from the compression space 103 can sequentially pass through the first discharge space 103a, the second discharge space 103b, and the third discharge space 103c, attenuating discharge noise, and is discharged to the outside of the outer casing 110 through the annular pipe 115a and the discharge pipe 115 connected to the third discharge cover 183.

[0117] The drive unit 130 may include: an outer stator 131 disposed between the housing 111 and the frame 120 in such a way as to surround the main body 121 of the frame 120; an inner stator 134 disposed between the outer stator 131 and the cylinder 140 in such a way as to surround the cylinder 140; and a moving member 135 disposed between the outer stator 131 and the inner stator 134.

[0118] The outer stator 131 can be attached to the rear of the flange portion 122 of the frame 120, and the inner stator 134 can be attached to the outer peripheral surface of the main body portion 121 of the frame 120.

[0119] The inner stator 134 can be configured separately from the inner side of the outer stator 131, and the movable member 135 is configured in the space between the outer stator 131 and the inner stator 134.

[0120] A wound coil may be mounted on the outer stator 131, and a permanent magnet may be provided on the moving part 135. The permanent magnet may consist of a single magnet with one pole, or a combination of multiple magnets with three poles.

[0121] The outer stator 131 includes: a coil winding body 132, which surrounds the axial direction along the circumferential direction; and a stator core 133, which surrounds the coil winding body 132 and is laminated. The coil winding body 132 may include: a winding bobbin 132a, which is a cylindrical shape with an empty interior; and a coil 132b, which is wound along the circumferential direction of the winding bobbin 132a. The cross-section of the coil 132b can be circular or polygonal, for example, it can be hexagonal. The stator core 133 can be made of multiple laminated sheets in a radial manner, or it can be made of multiple lamination blocks laminated along the circumferential direction.

[0122] The front side of the outer stator 131 can be supported by the flange 122 of the frame 120, and the rear side of the outer stator 131 is supported by the stator cover 137. For example, the stator cover 137 can be configured as an empty disc shape, with the outer stator 131 supported on its front side and the resonant spring 190 supported on its rear side.

[0123] The inner stator 134 can be constructed by laminating multiple layers along the circumferential direction on the outer peripheral surface of the main body 121 of the frame 120.

[0124] One side of the movable member 135 can be coupled to and supported by the magnet frame 136. The magnet frame 136 has a generally cylindrical shape and is configured to be inserted into the space between the outer stator 131 and the inner stator 134.

[0125] The magnet frame 136 is configured to be attached to the rear side of the piston 150 and move together with the piston 150.

[0126] As an example, the rear end of the magnet frame 136 can be bent inward in the radial direction and extended to form a joint 136a, which is joined to the flange 153 formed at the rear of the piston 150. The joint 136a of the magnet frame 136 and the flange 153 of the piston 150 can be joined by a mechanical joining member.

[0127] Furthermore, a flange 161a formed at the front of the intake muffler 161 can be sandwiched between the flange 153 of the piston 150 and the joint 136a of the magnet frame 136. Thus, the piston 150, the muffler unit 160, and the moving member 135 can move linearly and reciprocally together as an integral unit.

[0128] When current is applied to the drive unit 130, a magnetic flux is formed in the wound coil. Electromagnetic force is generated by the interaction between the magnetic flux formed in the wound coil of the outer stator 131 and the magnetic flux formed by the permanent magnet of the moving member 135, causing the moving member 135 to move. Simultaneously with the axial reciprocating movement of the moving member 135, the piston 150, connected to the magnet frame 136, also reciprocates along the axial direction along with the moving member 135.

[0129] In addition, the drive unit 130 and the compression units 140, 150 can be supported in the axial direction by the support springs 116, 117 and the resonant spring 190.

[0130] The resonant spring 118 amplifies the vibrations generated by the reciprocating motion of the moving member 135 and the piston 150, thereby effectively compressing the refrigerant. Specifically, the resonant spring 118 is adjusted to a vibration frequency corresponding to the natural vibration frequency of the piston 150, enabling the piston 150 to resonate. Furthermore, the resonant spring 118 induces stable movement of the piston 150, thereby reducing vibration and noise.

[0131] The resonant spring 118 can be a helical spring extending along the axial direction. The two ends of the resonant spring 118 can be connected to a vibrating body and a fixed body, respectively. For example, one end of the resonant spring 118 can be connected to the magnet frame 136, and the other end to the rear cover 123. Thus, the resonant spring 118 can elastically deform between the vibrating body at one end and the fixed body at the other end.

[0132] The natural frequency of the resonant spring 118 is designed to coincide with the resonant frequency of the moving part 135 and the piston 150 when the compressor 100 is running, thereby amplifying the reciprocating motion of the piston 150. However, the rear cover 123, which is provided as a fixed body, is elastically supported on the outer casing 110 by the first support spring 116, so it may not be strictly fixed.

[0133] The resonant spring 118 may include a first resonant spring 118a supported on the rear side with reference to the spring bracket 119 and a second resonant spring 118b supported on the front side.

[0134] The spring bracket 119 may include: a body portion 119a that surrounds the intake muffler 161; a connecting portion 119b that bends inward radially from the front of the body portion 119a; and a support portion 119c that bends inward radially from the rear of the body portion 119a.

[0135] The front of the joint 119b of the spring bracket 119 can be supported on the joint 136a of the magnet frame 136. The inner diameter of the joint 119b of the spring bracket 119 can be arranged to surround the outer diameter of the intake muffler 161.

[0136] For example, the joint portion 119b of the spring bracket 119, the joint portion 136a of the magnet frame 136, and the flange portion 153 of the piston 150 can be sequentially arranged and then integrally joined by mechanical components. In this case, similar to the previous description, the flange portion 161a of the intake muffler 161 can be sandwiched between the flange portion 153 of the piston 150 and the joint portion 136a of the magnet frame 136 and fixed integrally.

[0137] The first resonant spring 118a can be disposed between the front of the rear cover 123 and the rear of the spring bracket 119, and the second resonant spring 118b can be disposed between the rear of the stator cover 137 and the front of the spring bracket 119.

[0138] Multiple first and second resonant springs 118a and 118b can be arranged along the circumferential direction of the central axis. The first and second resonant springs 118a and 118b can be arranged side-by-side or staggered along the axial direction. The first and second springs 118a and 118b can be arranged at predetermined intervals along the radial direction of the central axis. For example, three of each of the first and second springs 118a and 118b can be provided, arranged at 120-degree intervals along the radial direction of the central axis.

[0139] Additionally, the compressor 100 may include multiple sealing members capable of increasing the bonding force between the frame 120 and its surrounding components.

[0140] For example, the multiple sealing components may include: a first sealing component, clamped at the junction of the frame 120 and the discharge cap assembly 180, and inserted into a mounting groove provided at the front end of the frame 120; and a second sealing component, disposed at the junction of the frame 120 and the cylinder 140, and inserted into a mounting groove provided on the outer surface of the cylinder 140. The second sealing component prevents refrigerant leakage from the gas groove 125c formed between the inner circumferential surface of the frame 120 and the outer circumferential surface of the cylinder 140, and can increase the bonding force between the frame 120 and the cylinder 140. The multiple sealing components may also include: a third sealing component, disposed at the junction of the frame 120 and the inner stator 134, and inserted into a mounting groove provided on the outer surface of the frame 120. The first to third sealing components may have an annular shape.

[0141] The operation of the linear compressor 100 described above is as follows.

[0142] First, when current is supplied to the drive unit 130, a magnetic flux is formed on the outer stator 131 by the current flowing in the coil 132b. The magnetic flux formed on the outer stator 131 generates an electromagnetic force, and the moving member 135, which is equipped with a permanent magnet, can reciprocate linearly using the generated electromagnetic force. This electromagnetic force can be alternately generated in the direction of the piston 150 toward the top dead center (TDC) during the compression stroke (forward direction) and in the direction of the piston 150 toward the bottom dead center (BDC) during the intake stroke (rearward direction). That is, the drive unit 130 can generate a thrust that pushes the moving member 135 and the piston 150 in the moving direction.

[0143] The piston 150, which performs linear reciprocating motion inside the cylinder 140, can repeatedly increase and decrease the volume of the compression space 103.

[0144] As the piston 150 moves in the direction of increasing the volume of the compression space 103 (rearward direction), the pressure in the compression space 103 decreases. Consequently, the suction valve 155, located in front of the piston 150, opens, allowing refrigerant retained in the suction space 102 to be drawn into the compression space 103 along the suction port 154. This suction stroke continues until the piston 150 reaches its maximum volume in the compression space 103 and is at bottom dead center.

[0145] Upon reaching bottom dead center, piston 150 reverses its direction of motion, moving forward to reduce the volume of compression space 103 and performing the compression stroke. During the compression stroke, the pressure in compression space 103 increases, compressing the drawn-in refrigerant. When the pressure in compression space 103 reaches a set pressure, the discharge valve 171 is pushed open from cylinder 140 under the pressure of compression space 103, and refrigerant is discharged through the separated space into discharge space 104. This compression stroke continues until piston 150 moves to top dead center, where the volume of compression space 103 is minimized.

[0146] By repeatedly performing the intake and compression strokes of the piston 150, the refrigerant flowing into the accommodating space 101 inside the compressor 100 through the intake pipe 114 sequentially flows through the intake guide 116a, the intake muffler 161, and the internal guide 162 into the intake space 102 inside the piston 150. During the intake stroke of the piston 150, the refrigerant in the intake space 102 flows into the compression space 103 inside the cylinder 140. During the compression stroke of the piston 150, the refrigerant that forms the compression space 103 is compressed and discharged into the discharge space 104, then flows through the annular pipe 115a and the discharge pipe 115 and is discharged to the outside of the compressor 100.

[0147] Figure 3 This is a perspective view showing the piston 150 of the comparative embodiment. Figure 4 Shown by cross section Figure 3 A three-dimensional view of the piston 150 in action.

[0148] Reference Figure 3 and Figure 4 The piston 150 includes: a head 151, located at the front and dividing the compression space (103, see reference). Figure 1 A cylindrical guide portion 152 extends rearward from the outer periphery of the head 151; a flange portion 153 extends radially outward from the rear of the guide portion 152 to secure the piston 150 to the compressor structure.

[0149] A suction port 154 is formed through the head 151 of the piston 150. The suction port 154 is configured to draw in the suction space (102, see reference) inside the piston 150. Figure 1It is connected to the compressed space 103.

[0150] The flange 153 of the piston 150 is attached to the magnet frame (136, see reference). Figure 1 In order to be connected to the joint (136a, see reference) of the magnet frame 136 by means of fastening members Figure 1 A connecting hole 153a for fastening members to pass through is formed in the flange portion 153.

[0151] In the piston 150 of the comparative embodiment described above, the piston 150 is directly mechanically coupled to the magnet frame 136, therefore, there will be no fluidity when moving in the front-to-back direction. Therefore, when an error occurs in the alignment of the piston 150, contact will occur between the piston 150 and the cylinder 140.

[0152] Figure 5 This is a perspective view showing the piston 150-1 of the first embodiment. Figure 6 yes Figure 5 An exploded 3D diagram.

[0153] Reference Figure 5 and Figure 6 The piston 150-1 of the first embodiment may include: a guide member 250 that reciprocates along the axial direction inside the cylinder 140; a bushing member 260 that is coupled to the guide member 250; and a mounting member 270 that is coupled to the bushing member 260.

[0154] The guide member 250 may include: a head 251, located at the front and dividing a compression space (103, see reference). Figure 1 A cylindrical guide portion 252 extends rearward from the outer periphery of the head 251.

[0155] The bushing member 260 can be coupled to the outer peripheral surface of the rear end of the guide member 250, and the mounting member 270 can be coupled to the outer peripheral surface of the bushing member 260.

[0156] The guide member 250 includes a head 251 and a guide portion 252, which are configured as separate components and joined together, or the head 251 and the guide portion 252 are integrally formed.

[0157] An extension 255 capable of engaging the bushing member 260 is provided at the rear end of the guide member 250.

[0158] For example, the extension 255 can be bent from the rear end of the guide 252 in a manner that reduces the radius to form a step and extend rearward. By making the radius of the extension 255 smaller than the radius of the guide 252, the increase in volume of the piston 150-1 due to the increase in the thickness of the bushing member 260 can be compensated.

[0159] Furthermore, the extension 255 can be easily manufactured by extending with the same radius as the guide 252, or it can have a larger radius than the guide 252 to increase the rigidity of the joint.

[0160] The guide member 250 may also include a first engagement portion 256 for engaging with the bushing member 260.

[0161] The first joint portion 256 may be configured as a protrusion. In this case, the first joint portion 256 may be defined as a first joint protrusion.

[0162] The first engaging portion 256 may protrude from the outer peripheral surface of the extension 255, thereby securely engaging with the bushing member 260. For example, the first engaging portion 256 may protrude in a ring shape from the outer peripheral surface of the extension 255.

[0163] Alternatively, the first connecting portion 256 can also be configured as a groove. In this case, a protrusion can be formed on the bushing member 260 to engage with the first connecting portion 256 configured as a groove.

[0164] The following explanation will be based on the case where the first joint portion 256 is a first joint protrusion in the shape of a protrusion.

[0165] The bushing member 260 can be sandwiched between the guide member 250 and the flange member 270, thereby adjusting the engagement between the bushing member 260 and the guide member 250.

[0166] The bushing member 260 may be made of an elastic material. That is, the bushing member 260 may be defined as an elastic member 260.

[0167] For example, the bushing component 260 can be made of rubber. In order to prevent displacement in the length direction of the piston 150-1 or the guide component 250 from dislodging, a rubber material with a Shore hardness of 30 or higher can be used.

[0168] The bushing member 260 can function as a self-aligning device capable of correcting the alignment of the guide member 250.

[0169] The bushing member 260 can be configured to be elastic in the radial direction. That is, it can allow the guide member 250 to tilt to some extent.

[0170] Therefore, when the guide member 250 is subjected to force in the radial direction during its forward and backward movement, the bushing member 260 deforms along the radial direction and absorbs the force, thereby preventing the guide member 250 from colliding with the cylinder 140.

[0171] The bushing member 260 can be configured to be elastic in the circumferential direction. That is, it can allow rotation of the guide member 250 to a certain extent.

[0172] Therefore, when the guide member 250 is subjected to torque in the circumferential direction during its forward and backward movement, the bushing member 260 deforms along the torsional direction and absorbs the torque, thereby alleviating the fatigue applied to the guide member 250.

[0173] The bushing member 260 may include: a circular ring-shaped body 261; an inner connecting portion formed on the inner circumferential surface of the body 261; and an outer connecting portion formed on the outer circumferential surface of the body 261.

[0174] Reference Figures 6 to 8 As one embodiment, the inner connecting portion includes an inner connecting groove 262 recessed from the inner peripheral surface of the body 261, and the outer connecting portion includes an outer connecting groove 263 recessed from the outer peripheral surface of the body 261.

[0175] The bushing member 260 may have inner bosses 261a and 261b, which are located on the inner circumferential surface of the body 261 and protrude further in the radial direction than the inner mating groove 262.

[0176] In detail, an inner first boss 261a with an annular shape protruding inward in the radial direction is formed on one side (front) of the inner mating groove 262, and an inner second boss 261b with an annular shape protruding inward in the radial direction is formed on the other side (rear).

[0177] When the first joint portion 256 is configured as a protrusion, the first joint portion 256 is prevented from disengaging forward by the inner first protrusion 261a and from disengaging backward by the inner second protrusion 261b.

[0178] The bushing member 260 may have outer bosses 263a and 263b, which are located on the outer peripheral surface of the body 261 and protrude further outward in the radial direction than the outer mating groove 263.

[0179] A first outer boss 261c with an annular shape protruding outward in the radial direction is formed on one side (front) of the outer mating groove 263, and a second outer boss 261d with an annular shape protruding outward in the radial direction is formed on the other side (rear).

[0180] When the second joint 272 described later is configured as a protrusion, the outer first protrusion 261c prevents it from disengaging forward, and the outer second protrusion 261d prevents it from disengaging backward.

[0181] The inner engagement groove 262 can be configured to correspond to the shape of the first engagement portion 256 so that the first engagement portion 256 protruding from the outer peripheral surface of the extension 255 of the guide member 250 can be inserted into the inner engagement groove 262.

[0182] By inserting the first engagement portion 256 into the inner engagement groove 262, the guide member 250 can be prevented from detaching from the bushing member 260. Furthermore, during assembly, the engagement of the first engagement protrusion 256 and the inner engagement groove 262 can improve assembly convenience.

[0183] Furthermore, the width (axial length) of the outer connecting groove 263 can be formed to be more than 1.5 times the depth (radial length) of the outer connecting groove 263.

[0184] Furthermore, the width (axial length) of the inner mating groove 262 can be formed to be more than 1.5 times the depth (radial length) of the inner mating groove 262.

[0185] Furthermore, the positions of the first engaging protrusion 256 and the engaging inner groove 262 can be interchanged. For example, a groove may be formed on the outer peripheral surface of the engaging portion 255 of the guide member 250, and a protrusion may be formed on the inner peripheral surface of the bushing member 260.

[0186] The outer connecting groove 263 can be configured to correspond to the shape of the second connecting portion 272 so that the second connecting portion 272 formed on the inner circumferential surface of the body 271 of the mounting member 270 can be inserted into the outer connecting groove 263.

[0187] That is, when the bushing member 260 has an outer engagement groove 263, the mounting member 270 may have a second engagement portion 272 that protrudes from the inner circumferential surface of the body 271. In this case, the second engagement portion 272 can be defined as a second engagement protrusion.

[0188] By inserting the second connecting portion 272 into the outer connecting groove 263, the bushing member 260 can be prevented from detaching from the mounting member 270. Furthermore, the engagement of the second connecting portion 272 and the outer connecting groove 263 during assembly can improve assembly convenience.

[0189] The depth of the grooves in the inner mating groove 262 and the outer mating groove 263 can be machined to approximately 2 mm, with a tolerance of 0.1 mm allowed. The ratio of the width to the length of the protrusion is designed to be greater than 1.5, thereby preventing wobble and disengagement in the longitudinal direction (axial direction).

[0190] Furthermore, the second mating portion 272 and the outer mating groove 263 mating therewith can interchange the positions of the groove and the protrusion. For example, a groove may be formed on the inner circumferential surface of the body 271 of the mounting member 270, and a protrusion may be formed on the outer circumferential surface of the bushing member 260.

[0191] The mounting member 270 may include: a ring-shaped body 271 surrounding the bushing member 260; a mounting flange 273 protruding from the outer peripheral surface of the body 271 and fixing the mounting member 270 to the compressor structure; and a second joint 272 formed on the inner peripheral surface of the body 271.

[0192] The second joint portion 272 can be formed in a shape corresponding to the outer joint portion of the bushing member 260. Specifically, when the outer joint portion of the bushing member 260 is configured as a protrusion or a groove, the second joint portion 272 can be configured as a groove or a protrusion.

[0193] Multiple mounting flanges 273 can be formed on the outer peripheral surface of the body 271, and they can be configured at the same angle to each other. For example, three mounting flanges 273 can be formed at 120-degree intervals.

[0194] Mounting flange 273 can be formed with mounting holes 274 for fastening components to pass through and engage.

[0195] Mounting flange 273 can be integrated into the magnet frame (136, see reference). Figure 1 ) or spring bracket (119, see reference) Figure 1 For example, a fastening member penetrating the mounting hole 274 can be attached to the magnet frame 136 or the spring bracket 119 to secure the flange member 270. In the mounting member 270 of the first embodiment, the mounting flange 273 can be defined as a frame joint attached to the magnet frame 136.

[0196] Furthermore, in this specification, the magnet frame 136 may be integrally formed with the spring support 119, and the magnet frame 136 can be understood to include the concept of the spring support 119. Also, the meaning of the flange member 270 being attached to the spring support 119 can be understood as the flange member 270 being connected to the magnet frame 136.

[0197] Figure 7 This is a perspective view showing the assembly of the piston 150-1 of the first embodiment in cross-section.

[0198] Reference Figure 7 The guide member 250 can be attached to the spring bracket 119 via the flange member 270.

[0199] The bushing member 260 can be sandwiched between the guide member 250 and the mounting member 270, and allows the guide member 250 to move a specified displacement relative to the mounting member 270.

[0200] Alternatively, unlike the accompanying drawings, the mounting member 270 may also be integrated into the magnet frame 136. Alternatively, the magnet frame 136 and the spring bracket 119 may be integrally formed, with the mounting member 270 integrated into the integrally formed magnet frame 136 or spring bracket 119.

[0201] The bushing member 260 can allow the guide member 250 to be displaced in the axial direction, and at the same time, it can allow the guide member 250 to be displaced in the circumferential direction.

[0202] That is, the bushing member 260 deforms due to the contact pressure or lubrication surface pressure transmitted to the guide member 250, and the posture of the piston 150-1 changes in a variable manner as the bushing member 260 deforms. By ensuring the degree of freedom of the guide member 250 as described above, the alignment of the guide member 250 can be satisfied and the contact pressure minimized using only the pressure generated in the lubrication surface between the piston 150-1 and the cylinder 140, thereby improving reliability and durability. As a result, the piston 150-1 can operate stably within the cylinder 130 with minimal misalignment.

[0203] Furthermore, in the case of a linear compressor 100 operating without additional sensors, there is an intermittent possibility that the head 251 may collide with the discharge valve 171. In this case, the bushing member 260 can act as a buffer to absorb the impact.

[0204] Furthermore, compared to other self-aligning devices made of metal, the bushing component 260 requires no additional lubricant and has a low probability of functional loss due to fatigue failure, thus making it superior in terms of management.

[0205] Figure 8 This is a diagram showing the assembly of bushing member 260-1 in an enlarged manner, which is a modified embodiment of the first embodiment.

[0206] The first joint portion 256-1 of the guide member 250-1 can be joined at the inner joint portion of the bushing member 260-1, and the second joint portion 272 of the mounting member 270 can be joined at the outer joint portion of the bushing member 260-1.

[0207] Reference Figure 8 An inner engagement groove 262 is formed on the inner peripheral surface of the bushing member 260-1 to engage the first engagement portion 256-1 of the protruding shape of the guide member 250-1, and an outer engagement groove 263 is formed on the outer peripheral surface of the bushing member 260-1 to engage the second engagement portion 272 of the protruding shape of the mounting member 270.

[0208] In bushing member 260-1, the body 261, made of an elastic, deformable material, can deform from a circular shape to an elliptical shape to some extent, thus allowing a member to be easily joined to its inner or outer side. However, after joining a member to its inner or outer side, the body 261 of bushing member 260-1 will maintain a circular shape. Therefore, in order to join another member to the opposite side of the inner or outer side, a portion (boss) of the annular shape of the body 261 in front of or behind the joining groove needs to be deformed to a degree that allows a protrusion with an outer diameter larger than the inner diameter of the body 261 to enter. However, when a portion (boss) of the body 261 is allowed to deform in this way, there is a possibility that, during the operation of compressor 100, guide member 250-1 may detach from bushing member 260-1 or bushing member 260-1 may detach from mounting member 270.

[0209] To prevent this situation, the first joint portion 256-1 of the guide member 250-1 can be configured as a protruding shape that protrudes at predetermined intervals in the circumferential direction instead of being configured as a ring shape, and the bushing member 260-1 forms a sliding channel 264 on the inner first boss 261a that corresponds to the shape of the first joint portion 256-1.

[0210] At this time, the sliding channel 264 formed on the inner circumferential surface of the bushing member 260-1 can be defined as the inner sliding channel.

[0211] For example, if the first joint 256-1 is formed in three at 120-degree intervals, the corresponding sliding channel 264 is also formed in three at 120-degree intervals.

[0212] The piston 150-1 is engaged as follows. First, the bushing member 260-1 is engaged with the mounting member 270. At this time, since the bushing member 260-1 can deform, even with the outer bosses 261c and 261d, the second engagement portion 272 can be easily engaged with the outer engagement groove 263. Next, the first engagement portion 256-1 of the guide member 250-1 and the sliding channel 264 of the bushing member 260-1 are positioned so that the first engagement portion 256-1 passes through the opening of the sliding channel 264 and engages with the inner engagement groove 262. Subsequently, the guide member 250-1 is rotated at a predetermined angle, thereby causing the first engagement portion 256-1 and the sliding channel 264 to be arranged alternately.

[0213] Additionally, a stop 262a can be formed in the inner mating groove 262 to prevent rotation of the first mating portion 256-1.

[0214] At this time, the stop 262a formed in the inner mating groove 262 can be defined as an inner stop.

[0215] The stop 262a is configured to protrude radially inward from the inner engagement groove 262 and prevent the first engagement portion 256-1 from rotating to the position of the sliding channel 264 adjacent to the sliding channel 264 through which the first engagement portion 256-1 passes. For example, the stop 262a may be formed by protruding at the middle angle of the adjacent sliding channel 264.

[0216] Furthermore, the groove, sliding channel, and stop of the bushing member 260-1 can be formed by interchangeably alternating the positions of the protrusion of the guide member 250-1. That is, a protrusion can be formed on the inner circumferential surface of the bushing member 260-1, and the guide member 250-1 is formed with a groove for the protrusion to be inserted, a sliding channel for the protrusion to pass through, and a stop to prevent the protrusion from rotating more than a predetermined angle.

[0217] Figure 9 This is a perspective view showing the assembly of the piston 150-2 of the second embodiment in cross-section.

[0218] Reference Figure 9 The guide member 250-2 can be coupled to the spring bracket 119 via the mounting member 280. The bushing member 260-2 can be clamped between the guide member 250-2 and the mounting member 280, thereby allowing the guide member 250-2 to move a specified displacement relative to the mounting member 280.

[0219] Alternatively, unlike the accompanying drawings, the mounting member 280 may also be integrated into the magnet frame 136. Alternatively, the magnet frame 136 and the spring bracket 119 may be integrally formed, with the mounting member 280 integrated into the integrally formed magnet frame 136 or spring bracket 119.

[0220] Mounting member 280 may include: a support plate 281, which is attached to the spring bracket 119 or the magnet frame 136; and a mounting member extension that extends forward from the support plate 281.

[0221] The extension of the mounting component may include: a mounting rod 282 extending forward from one side of the support plate 281; and a connecting plate 283 extending outward in a radial direction from the front part of the mounting rod 282, so that the bushing component 260-2 is connected to the connecting plate 283.

[0222] The support plate 281 can be configured as a circular disk shape.

[0223] The outer periphery of the support plate 281 can be combined with the spring bracket 119. For example, a cylindrical connecting portion 281b can extend behind the support plate 281, and the connecting portion 281b of the support plate 281 can be inserted into the inner side of the connecting portion 119b of the spring bracket 119 and clamped in. That is, the connecting portion 119b of the spring bracket 119 can support the outer periphery of the connecting portion 281b of the support plate 281 at more than two points.

[0224] Additionally, the support plate 281 can be coupled together with the muffler unit 160 to the spring bracket 119 or the magnet frame 136. For example, the coupling portion 281b of the support plate 281 can be inserted into the front opening of the muffler unit 160 and clamped in place, and the front portion of the muffler unit 160 can be inserted into the inner side of the coupling portion 119b of the spring bracket 119 and clamped in place.

[0225] The support plate 281 may have a connecting hole 281a through which refrigerant flowing in from the muffler unit 160 can pass. For example, the connecting hole 281a may be formed as a circular or arc-shaped opening, and multiple holes may be formed in the circumferential direction of the support plate 281.

[0226] The mounting rod 282 may be rod-shaped and extend in the forward axial direction of the support plate 281. For example, the mounting rod 282 may extend forward from the center of the support plate 281 along the center of the guide member 250-2 and extend in a manner spaced apart from the head 251.

[0227] That is, the mounting rod 282 can prevent contact with the head 251.

[0228] The connecting plate 283 can be a disc-shaped plate that is attached to the front outer peripheral surface of the mounting rod 282.

[0229] The mounting member 280 may further include a second coupling portion connected to the bushing member 260-2. The second coupling portion of the second embodiment of the present invention differs from the second coupling portion of the first embodiment in its position and coupling relationship.

[0230] The second joint portion may be provided on the joint plate 283. The second joint portion may be formed in a shape corresponding to the inner joint portion formed on the inner circumferential surface of the bushing member 260-2.

[0231] As an example, the second joint may be the outer peripheral corner 283b of the joint plate 283 that is inserted into the inner joint groove 262-1 of the bushing member 260-2.

[0232] A connecting hole 283a may be formed in the connecting plate 283, through which refrigerant flowing in from the muffler unit 160 can pass. For example, the connecting hole 283a may be formed as a circular or arc-shaped opening, and multiple connecting holes may be formed in the circumferential direction of the connecting plate 283.

[0233] In the second embodiment, the bushing member 260-2 may be located inside the guide member 250-2 and configured to surround the mounting member 280.

[0234] The guide member 250-2 in the second embodiment differs from that in the first embodiment in the position where it engages with the bushing member 260-2. Specifically, in the second embodiment, the first engagement portion 256-2 may be formed on the inner circumferential surface of the guide member 250-2 and engage with the bushing member 260-2.

[0235] The bushing member 260-2 may include: a ring-shaped body 261-1; an outer connecting portion formed on the outer peripheral surface of the body 261-1; and an inner connecting portion formed on the inner peripheral surface of the body 261-1.

[0236] The body 261-1 can be configured to surround the connecting plate 283 of the mounting member 280.

[0237] Furthermore, the outer connecting portion can be combined with the first connecting portion 256-2 formed on the inner circumferential surface of the guide member 250-2, and the inner connecting portion can be combined with the connecting plate 283 of the mounting member 280.

[0238] Reference Figure 9 The outer connecting portion may include an outer connecting groove 263-1 of a first connecting portion 256-2 with a protrusion formed on the inner circumferential surface of the guide member 250-2, and the inner connecting portion includes an inner connecting groove 262-1 connected to the outer peripheral corner of the connecting plate 283.

[0239] Furthermore, the protrusions of the outer mating groove 263-1 of the bushing member 250-2 and the first mating portion 256-2 of the guide member 250-2 can be interchanged. That is, a protruding outer mating portion can be formed on the bushing member 250-2, and a groove for inserting the protrusion can be formed on the inner circumferential surface of the guide member 250-2.

[0240] The bushing member 260-2 may be located at the center of the guide member 250-2 or at a position further forward therefrom. That is, the first mating portion 256-2 formed on the inner circumferential surface of the guide member 250-2 may be located at the center of the guide member 250-2 or at a position further forward therefrom.

[0241] The rear end of the guide member 250-2 is arranged axially spaced from the support plate 281. Therefore, when the bushing member 260-2 undergoes elastic deformation due to the force applied to the guide member 250-2, it is possible to prevent the guide member 250-2 from colliding with the support plate 281.

[0242] However, the gap between the guide member 250-2 and the support plate 281 can be minimized to the extent that only relative displacement of the guide member 250-2 is allowed. The diameter of the support plate 281 can be configured to be the same as or larger than the diameter of the guide member 250-2.

[0243] The bushing member 260-2 allows for axial displacement of the guide member 250-2, and simultaneously allows for circumferential displacement. That is, the bushing member 260-2 deforms due to the contact pressure or lubrication surface pressure transmitted to the guide member 250-2, and the posture of the piston 150-2 changes in a variable manner as the bushing member 260-2 deforms. By ensuring the degree of freedom of the guide member 250-2 as described above, the alignment of the guide member 250-2 and the contact pressure can be minimized using only the pressure generated in the lubrication surface between the piston 150-2 and the cylinder 140, thereby improving reliability and durability. Thus, the piston 150-2 can operate stably within the cylinder 130 with minimal misalignment.

[0244] Figure 10 This is a diagram showing the assembly of bushing member 260-3 as a modified embodiment of the second embodiment.

[0245] The bushing member 260-3 connects to the outer periphery corner of the connecting plate 283 in the inner side connecting groove 262-1 on the inner peripheral surface, and connects to the first connecting part 256-3 of the guide member 250-3 in the outer side connecting groove 263-1 on the outer peripheral surface.

[0246] The first joint portion 256-3 of the modified embodiment of the second embodiment of the present invention differs in shape from the first joint portion 256-2 of the second embodiment.

[0247] In the bushing member 260-3, the body 261-1, made of an elastic, deformable material, can deform from a circular shape to an elliptical shape to some extent, thus allowing a member to be joined to its inner or outer side. However, after joining a member to its inner or outer side, the body 261-1 of the bushing member 260-3 will maintain a circular shape. Therefore, in order to join another member to the opposite side of the inner or outer side, a portion (boss) of the annular shape of the body 261-1 in front of or behind the joining groove needs to be deformed to a degree that allows a protrusion with an outer diameter larger than the inner diameter of the body 261-1 to enter. However, when a portion (boss) of the body 261-1 is allowed to deform in this way, there is a possibility that, during the operation of the compressor 100, the guide member 250-3 may detach from the bushing member 260-3 or the bushing member 260-3 may detach from the mounting member 280.

[0248] To prevent this situation, the first joint portion 256-3 of the guide member 250-3 can be configured as a protruding shape that protrudes at predetermined intervals in the circumferential direction instead of being configured as a ring shape, and the bushing member 260-3 forms a sliding channel 265 on the outer first boss 261c that corresponds to the shape of the first joint portion 256-3.

[0249] At this time, the sliding channel 265 formed on the outer peripheral surface of the bushing member 260-3 can be defined as the outer sliding channel.

[0250] For example, if the first joint 256-3 is formed by three protrusions arranged at 120-degree intervals, the corresponding sliding channels 265 are also arranged in three intervals of 120 degrees.

[0251] The piston 150-2 is engaged as follows. First, the bushing member 260-3 is engaged with the mounting member 280. At this time, since the bushing member 260-3 can deform, even the inner bosses 261a and 261b can easily engage the corners of the engaging plate 283 with the inner engaging groove 262-1. Next, the first engaging portion 256-3 of the guide member 250-3 and the sliding channel 265 of the bushing member 260-3 are positioned so that the first engaging portion 256-3 passes through the opening of the sliding channel 265 and engages with the outer engaging groove 263-1. Subsequently, the guide member 250-3 is rotated at a predetermined angle, so that the first engaging portion 256-3 and the sliding channel 265 are arranged alternately.

[0252] Additionally, a stop 263a can be formed in the outer mating groove 263-1 to prevent the first mating portion 256-3 from rotating. In this case, the stop 263a formed in the outer mating groove 263-1 can be defined as an outer stop.

[0253] The stop 263a is configured to protrude radially outward from the outer engagement groove 263-1 and prevent the first engagement portion 256-3 from rotating to the position of the sliding channel 265 adjacent to the sliding channel 265 through which the first engagement portion 256-3 passes. For example, the stop 263a may be formed by protruding at the middle angle of the adjacent sliding channel 265.

[0254] Furthermore, the groove, sliding channel, and stop of the bushing member 260-3 can be formed by interchangeably changing the positions of the protrusion of the guide member 250-3. That is, a protrusion can be formed on the outer peripheral surface of the bushing member 260-3, and the guide member 250-3 is formed with a groove for the protrusion to be inserted, a sliding channel for the protrusion to pass through, and a stop to prevent the protrusion from rotating more than a predetermined angle.

[0255] Figure 11 This is a perspective view showing the assembly of the piston 150-2 of the third embodiment in cross-section.

[0256] Reference Figure 11 The guide member 250-2 can be coupled to the spring bracket 119 via the mounting member 290. The bushing member 260-2 can be clamped between the guide member 250-2 and the mounting member 290, allowing the guide member 250-2 to move a specified displacement relative to the mounting member 290.

[0257] Alternatively, unlike the accompanying drawings, the mounting unit 290 may also be integrated into the magnet frame 136. Alternatively, the magnet frame 136 and the spring bracket 119 may be integrally formed, with the mounting member 290 integrated into the integrally formed magnet frame 136 or spring bracket 119.

[0258] The mounting component 290 of the third embodiment differs from the mounting component 280 of the second embodiment in some structural aspects.

[0259] Mounting member 290 may include: a support plate 291, which is attached to the spring bracket 119 or the magnet frame 136; and a mounting member extension that extends forward from the support plate 291.

[0260] The extension of the mounting component may include: a mounting tube 292 extending forward from one side of the support plate 291; and a second connecting part 293 disposed at the front part of the mounting tube 292 and connecting with the bushing component 260-2.

[0261] The support plate 291 can be configured as a circular disk shape.

[0262] The outer periphery of the support plate 291 can be combined with the spring bracket 119. For example, a cylindrical connecting portion 291b can extend from the rear of the support plate 291, and the connecting portion 291b of the support plate 291 can be inserted into the inner side of the connecting portion 119b of the spring bracket 119 and clamped in. That is, the connecting portion 119b of the spring bracket 119 can support the outer periphery of the connecting portion 291b of the support plate 291 at more than two points.

[0263] Additionally, the support plate 291 can be combined with the muffler unit 160 in the spring bracket 119 or the magnet frame 136. For example, the joint portion 291b of the support plate 291 can be inserted into the front opening of the muffler unit 160 and clamped in, and the front portion of the muffler unit 160 can be inserted into the inside of the joint portion 119b of the spring bracket 119 and clamped in.

[0264] The mounting tube 292 may be a tube shape that extends through the support plate 291.

[0265] For example, the mounting tube 292 can extend forward from the center of the support plate 291 along the center of the guide member 250-2, and can extend in a manner spaced apart from the head 251.

[0266] That is, the mounting tube 292 can prevent contact with the head 251.

[0267] The mounting tube 292 can extend rearward from the center of the support plate 291 along the center of the muffler unit 160. In this case, the inlet of the mounting tube 292 can be arranged on the same axis as the outlet of the muffler unit 160.

[0268] The mounting pipe 292 can function as a connecting channel through which refrigerant flowing in from the muffler unit 160 can pass.

[0269] The second joint portion 293 can be formed as a protrusion extending radially outward from the front portion of the mounting tube 292. That is, the second joint portion 293 can be defined as a joint protrusion.

[0270] The second connecting portion 293 may be a flange shape that protrudes radially from the front outer periphery of the mounting tube 292. In this case, the second connecting portion 293 can be inserted into the inner connecting groove 262-1 of the bushing member 260-2.

[0271] The bushing member 260-2 may include: a ring-shaped body 261-1 surrounding the mounting tube 292; an outer coupling portion that engages with a first coupling portion 256-2 formed on the inner circumferential surface of the guide member 250; and an inner coupling portion that engages with a second coupling portion 293.

[0272] Reference Figure 11 The outer connecting portion may include an outer connecting groove 263-1 of a first connecting portion 256-2 in a protruding shape formed on the inner circumferential surface of the guide member 250-2, and the inner connecting portion includes an inner connecting groove 262-1 of a second connecting portion 293 in a protruding shape.

[0273] Furthermore, the protrusions of the outer mating groove 263-1 of the bushing member 250-2 and the second mating portion 256-2 of the guide member 250-2 can be interchanged. That is, the bushing member 250-2 can have a protruding outer mating portion, and the guide member 250-2 can have a groove for the protrusion to be inserted into.

[0274] The bushing member 260-2 may be located at the center of the guide member 250-2 or at a position further forward therefrom. That is, the first mating portion 256-2 formed on the inner circumferential surface of the guide member 250-2 may be located at the center of the guide member 250-2 or at a position further forward therefrom.

[0275] The rear end of the guide member 250-2 is disposed apart from the support plate 291. Therefore, when the bushing member 260-2 undergoes elastic deformation due to the force applied to the guide member 250-2, it is possible to prevent the guide member 250-2 from colliding with the support plate 291.

[0276] However, the gap between the guide member 250-2 and the support plate 291 can be minimized to the extent that only relative displacement of the guide member 250-2 is allowed. Furthermore, the diameter of the support plate 291 can be configured to be the same as or larger than the diameter of the guide member 250-2.

[0277] The bushing member 260-2 allows for axial displacement of the guide member 250-2, and simultaneously allows for circumferential displacement. That is, the bushing member 260-2 deforms due to the contact pressure or lubrication surface pressure transmitted to the guide member 250-2, and the posture of the piston 150-2 changes in a variable manner as the bushing member 260-2 deforms. By ensuring the degree of freedom of the guide member 250-2 as described above, the alignment of the guide member 250-2 and the contact pressure can be minimized using only the pressure generated in the lubrication surface between the piston 150-2 and the cylinder 140, thereby improving reliability and durability. Thus, the piston 150-2 can operate stably within the cylinder 130 with minimal misalignment.

[0278] In addition, the combination of groove, boss, and sliding channel described above can be provided on one of the outer or inner peripheral surface of the elastic member, the outer or inner peripheral surface of the guide member, or the outer or inner peripheral surface of the mounting member. In this case, a protrusion inserted into the groove can be provided on the other side combined with said one side.

[0279] Furthermore, a stop may be additionally provided on the aforementioned party.

[0280] The embodiments or other embodiments described above are not exclusive to or distinct from each other. Various structural features or functions of the embodiments or other embodiments described above can be used together or combined.

[0281] For example, it indicates that feature A described in a particular embodiment and / or figure and feature B described in another embodiment and / or figure can be combined. That is, even if the combination between structural features is not directly described, it can be combined in all cases except where it is stated that they cannot be combined.

[0282] The detailed description above should be considered illustrative in all respects and not construed as limiting. The scope of this specification must be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of this specification are included within its scope.

[0283] In the compressor described in this specification, an elastically deformable bushing is added to the piston joint, allowing the bushing to undergo variable elastic deformation according to the surrounding environment. This reduces the contact pressure acting on the piston and minimizes piston misalignment, thereby maintaining an appropriate clearance between the piston and cylinder. This reduces friction or wear between the cylinder and piston and improves compression reliability.

Claims

1. A compressor comprising: Piston structure, including a guide member that reciprocates along the axial direction inside the cylinder; The magnet frame supports the movable component that moves together with the piston structure. The piston structure includes: The guiding component; Mounting components are connected to the magnet frame; and An elastic member, capable of elastic deformation, is disposed between the guide member and the mounting member. The guide member further includes a first engagement portion that is coupled to the inner circumferential surface of the elastic member. The mounting component further includes a second coupling portion that engages with the outer peripheral surface of the elastic component. The elastic member includes: An inner connecting portion, in the shape of a protrusion or a groove, is provided on the inner circumferential surface of the elastic member to engage with the first connecting portion; and The outer connecting portion is provided on the outer peripheral surface of the elastic member in the shape of a protrusion or a groove, so as to engage with the second connecting portion.

2. The compressor according to claim 1, wherein, The elastic member is configured as a ring or a portion of a ring.

3. The compressor according to claim 1, wherein, The guiding component includes: A cylindrical guide section; The head is positioned in front of the guide portion and compresses the compression space inside the cylinder. The first joint is located behind the guide portion.

4. The compressor according to claim 3, wherein, The mounting components include: The mounting component body surrounds all or part of the elastic component; The frame joint extends radially outward from the body of the mounting component and is connected to the magnet frame; The second joint is disposed on the inner circumferential surface of the mounting component body.

5. The compressor according to claim 1, wherein, The first joint of the guide member is configured as a protruding shape that protrudes at predetermined intervals in the circumferential direction.

6. The compressor according to claim 5, wherein, The inner connecting portion includes an inner connecting groove that engages with the first connecting portion and an inner boss formed on one side of the inner connecting groove. The inner boss includes a sliding channel configured to correspond to the shape of the first joint. After the sliding channel and the first joint are engaged, the first joint is rotated by a predetermined angle so that the sliding channel and the first joint are staggered.

7. The compressor according to claim 6, wherein, The inner joint includes a stop to prevent the first joint from rotating more than a specified angle.

8. The compressor according to claim 1, wherein, The outer joint includes an outer joint groove that engages with the mounting member and an outer boss that protrudes further radially outward than the outer joint groove.

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