Check ring

Abstract

The check ring comprises a body formed by winding a flat metal wire, the body comprises at least two layers, the body comprises two end parts and a connecting part for connecting the two end parts, self-locking structures are arranged at the matching positions of the two end parts and the connecting part, and each self-locking structure comprises a lock and a lock hole; the connecting part is provided with a balance part which balances the mass center of the body, and the mass center of the body is located on the imaginary central axis of the body. Or the balancing part balances the mass center of the body, and the mass center of the body is close to the imaginary central axis of the body; a gap between the lock and the lock hole is large, so that an automatic mounting effect can be realized; the lock and the lock hole are not locked in the tangential direction, a compensation balance effect is formed through the balance part, the mass center is located on the imaginary central axis of the body or infinitely approaches the imaginary central axis of the body, the influence of centrifugal force on the check ring at the high rotating speed is greatly reduced, the allowable rotating speed of the check ring is further increased, and the service life of the check ring is prolonged. And the high-speed operation environment is met.

Description

Technical Field

[0001] The invention relates to the technical field of retaining rings, and in particular to a retaining ring. Background Art

[0002] A retaining ring, also known as a circlip or snap ring, is a ring-shaped part that is fastened to a shaft or hole. It mainly serves the purpose of axial fixation to prevent other parts installed in the shaft or hole from moving.

[0003] In current technology, there are single-layer retaining rings and multi-layer retaining rings (at least two layers). Since single-layer retaining rings have gaps, they are prone to fall off and separate under the action of centrifugal force, so multi-layer retaining rings are used in high-speed operation environments. Multi-layer retaining rings are spiral retaining rings made of flat metal wires, and the spiral retaining rings have at least two layers. In order to prevent the multi-layer retaining ring from loosening during use, self-locking structures are set on the two ends of the retaining ring, such as through the cooperation of a lock and a lock hole.

[0004] The multi-layer retaining ring can be used as a shaft retaining ring or a hole retaining ring. Here, the shaft retaining ring is used as an example for description. Figure 1-Figure 2 As shown, the shaft is provided with a groove, and after the self-locking retaining ring is installed in the groove diameter, the lock 13 and the lock hole 14 are just stuck or there is a small gap. Since the inner diameter of the retaining ring is less than the groove diameter and the shaft diameter, when the inner diameter of the retaining ring passes through the shaft diameter, the lock 13 will exceed the position of the cutout near the end 11 of the lock hole 14, causing the thickness of the retaining ring to increase, so that the thickness of the retaining ring exceeds the height of the groove, and it can only be installed manually, and it needs to be knocked when necessary. Knocking may cause the retaining ring to fail (the lock 13 will be deformed during the knocking process).

[0005] The structure of multi-layer retaining ring with self-locking function has the following problems: ① Since the size and strength of the lock and lock hole are limited by the product size and material, the allowable speed cannot be further increased.

[0006] ②Difficult to install: Manual installation, and sometimes knocking is required. Summary of the invention

[0007] Therefore, the technical problem to be solved by the present invention is how to increase the permissible rotation speed of the retaining ring and facilitate installation. To this end, a retaining ring includes a body wound by a flat metal wire, the body having at least two layers, The body comprises two ends and a connecting portion connecting the two ends, and a self-locking structure is provided at the matching positions of the two ends and the connecting portion, and the self-locking structure comprises a lock and a lock hole; The connecting portion is provided with a balancing portion, the balancing portion balances the center of mass of the body, and the center of mass of the body is located on the imaginary central axis of the body; or, the balancing portion balances the center of mass of the body, and the center of mass of the body is close to the imaginary central axis of the body; In the first state, the lock has not entered the lock hole; In the second state, the retaining ring cooperates with the installation object, and the lock enters into the lock hole and cooperates with the side wall of the lock hole; In the third state, the retaining ring enters into the groove of the installation object, and the lock moves in the direction in which the lock enters into the lock hole.

[0008] The distance between the center of mass of the body and the imaginary central axis of the body is L, and L≤0.02mm.

[0009] The balancing portion is a groove type or a hole type.

[0010] When the balancing portion is groove-shaped, the balancing portion is open toward the outside and penetrates the connecting portion in the axial direction; or, when the balancing portion is groove-shaped, the balancing portion is open toward the outside and does not penetrate the connecting portion in the axial direction.

[0011] The balancing part is a counterweight structure, and the counterweight structure is embedded in the connecting part.

[0012] The lock hole includes a first side wall and a second side wall, and the lock is inclined toward the first side wall; or the lock is inclined toward the second side wall.

[0013] The lock hole is arranged at the end portion, and the lock is arranged at the connecting portion.

[0014] The lock is formed by stamping and bending.

[0015] The two ends are offset in the axial direction.

[0016] The technical solution of the present invention has the following advantages: 1. The present invention provides a retaining ring, which adopts this structural setting, and the gap between the lock and the lock hole is relatively large, and can be directly used for automatic installation: when installed in the shaft or hole, the lock is still in the lock hole, which will not cause the thickness of the retaining ring to increase and cannot be installed in the groove, thereby achieving the effect of automatic installation; because the lock and the lock hole are not completely locked in the tangential direction, a compensating balance effect is formed through the balance part, so that the center of mass is located on the imaginary central axis of the body, or the center of mass is infinitely close to the imaginary central axis of the body. The influence of centrifugal force on the retaining ring at high speed is greatly reduced, and the allowable speed of the retaining ring is further increased to meet the high-speed operation environment.

[0017] 2. The spacing setting of the retaining ring provided by the present invention further reduces the influence of centrifugal force on the retaining ring.

[0018] 3. In a retaining ring provided by the present invention, the balancing part can form a structure of a balancing end portion through the structure of a hollow connecting part, so that the center of mass is located on the imaginary central axis of the main body or infinitely close to the imaginary central axis of the main body, thereby reducing the influence of centrifugal force on the retaining ring.

[0019] 4. In the retaining ring provided by the present invention, the balancing part can adjust the shape, size and depth according to actual needs, so that the position of the center of mass can be better adjusted.

[0020] 5. The counterweight structure of the retaining ring provided by the present invention compensates for the unbalanced weight effect caused by the self-locking structure and adjusts the position of the center of mass.

[0021] 6. A retaining ring provided by the present invention has a lock that tilts in different directions for different use environments. For example, for a retaining ring for a shaft, the lock tilts toward the first side wall; for a retaining ring for a hole, the lock tilts toward the second side wall.

[0022] 7. The retaining ring provided by the present invention has a lock hole and a lock element distributed at different positions, thereby achieving a better matching effect.

[0023] 8. The retaining ring provided by the present invention is formed by stamping and bending, which makes the lock processing more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a structural schematic diagram of a retaining ring in the prior art; Figure 2 It is a schematic diagram of the structure of the lock beyond the lock hole near the end cutout in the prior art; Figure 3 A schematic diagram of the structure of the shaft retaining ring provided by the present invention; Figure 4 A top view of the shaft retaining ring provided by the present invention; Figure 5 A side view of the shaft retaining ring provided by the present invention; Figure 6 A schematic diagram of the structure of a shaft retaining ring in a first state provided by the present invention; Figure 7 A schematic diagram of the shaft retaining ring structure in the second state provided by the present invention; Figure 8 A schematic diagram of the structure of a shaft retaining ring in a third state provided by the present invention; Fig. 9 A schematic diagram of the structure of different balancing parts provided by the present invention; Fig.10 A schematic diagram of a structure in which the balancing portion provided by the present invention is a hole-shaped portion; Fig.11 The balancing part provided by the present invention is a structural schematic diagram of a counterweight structure; Fig.12 This is a schematic structural diagram of the hole retaining ring provided by the present invention.

[0026] Description of reference numerals: 10. Main body; 11. End; 12. Connecting part; 13. Lock; 14. Lock hole; 15. Balance part; 121. Guide slope; 141. First side wall; 142. Second side wall. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] Example 1 This embodiment provides a retaining ring, as shown in the attached Figure 3-Figure 12 As shown, it includes a body 10 wound by a flat metal wire, and the body 10 has at least two layers. The number of layers of the body 10 can be adjusted according to actual needs. In this embodiment, two layers are used as an example for description. The body 10 is a circular ring structure as a whole. The specific material of the body 10 can be adjusted according to actual needs, and can be steel or alloy.

[0032] The main body 10 includes two end portions 11 and a connecting portion 12 connecting the two end portions 11. The two end portions 11 refer to the two ends of the main body 10. In this embodiment, one end portion 11 is located at the bottom and the other end portion 11 is located at the top. The connecting portion 12 is formed by winding. The connecting portion 12 is provided with a guiding slope 121 to form an upper and lower layer misalignment. At this time, the connecting portion 12 forms an upper and lower layer structure. The top surface of the upper connecting portion 12 is coplanar with the top surface of the end portion 11 located at the top, and the bottom surface of the lower connecting portion 12 is coplanar with the bottom surface of the end portion 11 located at the bottom. The end portion 11 located at the top extends toward the guiding slope 121, but does not fit with the guiding slope 121; the end portion 11 located at the bottom also extends toward the guiding slope 121, but also does not fit with the guiding slope 121.

[0033] The matching parts of the two end portions 11 and the connecting portion 12 are both provided with self-locking structures. Here, the matching part of the connecting portion 12 specifically refers to that a self-locking structure is provided between the end portion 11 located at the top and the connecting portion 12 located at the bottom layer, forming a top-to-bottom matching; a self-locking structure is provided between the end portion 11 located at the bottom and the connecting portion 12 located at the upper layer, forming a top-to-bottom matching. The matching parts of the two end portions 11 and the connecting portion 12 are specifically axial top-to-bottom matching. In this embodiment, the structures of the two self-locking structures are the same, so only one of the self-locking structures is described, and the description is specifically made by taking the end portion 11 located at the top as an example. The self-locking structure includes a lock 13 and a lock hole 14. The lock 13 and the lock hole 14 form a self-locking effect to prevent the retaining ring from separating during high-speed rotation.

[0034] The connecting portion 12 is provided with a balancing portion 15, and the balancing portion 15 balances the center of mass of the main body 10, and the center of mass of the main body 10 is located on the imaginary central axis of the main body 10. When the retaining ring is installed to the installation object, the imaginary central axis of the main body 10 and the imaginary central axis of the installation object are collinearly arranged, that is, the center of mass of the main body 10 is also located on the imaginary central axis of the installation object. During high-speed rotation, the center of mass is located on the imaginary central axis of the installation object, so that the retaining ring will not be affected by the centrifugal force. Alternatively, the balancing portion 15 balances the center of mass of the main body 10, and the center of mass of the main body 10 is close to the imaginary central axis of the main body 10, that is, the center of mass of the main body 10 is infinitely close to the imaginary central axis of the main body 10. According to the formula of centrifugal force F=mrω^2, when r is smaller, the centrifugal force is also smaller, that is, the smaller the distance from the center of mass of the main body 10 to the imaginary central axis of the main body 10 is, the centrifugal force is also smaller. Here, it should also be noted that due to the influence of the self-locking structure on the connecting portion 12, the main body 10 is not a completely symmetrical component, resulting in an offset of the overall center of mass, that is, the center of mass of the conventional structure is not located on the imaginary central axis of the main body 10.

[0035] In the first state, the lock 13 has not entered the lock hole 14, which is a normal state, and the retaining ring has not started to be installed. The first state here is a free state.

[0036] In the second state, the retaining ring cooperates with the installation object, and the lock 13 enters the lock hole 14 and cooperates with the side wall of the lock hole 14. For example, when the installation object is a shaft, in the second state, the inner diameter of the retaining ring will be expanded. At this time, the lock 13 slides in the lock hole 14 until it cooperates with the side wall of the lock hole 14 away from the entry side. Here, the lock 13 and the side wall can be set against each other, or a gap can be formed between the two. At this time, the lock 13 and the lock hole 14 are formed to cooperate, and even if the expansion is maximized, the lock 13 will not extend between the end 11 and the connecting portion 12. For another example, when the installation object is a hole, in the second state, the inner diameter of the retaining ring will shrink. At this time, the lock 13 will also enter the lock hole 14 until it cooperates with the side wall of the lock hole 14 away from the entry side. Here, the lock 13 and the side wall can be set against each other, or a gap can be formed between the two. At this time, the lock 13 and the lock hole 14 are formed to cooperate, and even if the lock is locked to the minimum, the lock 13 will not extend between the end 11 and the connecting portion 12.

[0037] In the third state, the retaining ring enters the groove of the installation object, and the lock 13 moves in the direction in which the lock 13 enters the lock hole 14. For example, the lock 13 enters the lock hole 14 from the right side of the lock hole 14. In the second state, the lock 13 moves to the left to match the left side wall of the lock hole 14. In the third state, the lock 13 moves to the right. The lock 13 can be located in the lock hole 14, or it can be moved to the right to match the right side wall of the lock hole 14. Whether it is a retaining ring for a shaft or a retaining ring for a hole, after installation, the lock 13 will move and reset, and the lock 13 is located in the lock hole 14. At this time, the retaining ring after installation has limited the radial displacement, but has not completely limited the tangential position, that is, the lock 13 can move in the lock hole 14.

[0038] With this structural setting, the gap between the lock 13 and the lock hole 14 is relatively large, and it can be directly used for automatic installation: when installed in the shaft or hole, the lock 13 is still in the lock hole 14, which will not cause the thickness of the retaining ring to increase and cannot be installed in the groove, thereby achieving the effect of automatic installation; because the lock 13 and the lock hole 14 are not locked in the tangential direction, a compensating balance effect is formed through the balance part 15, so that the center of mass is located on the imaginary central axis of the body 10, or the center of mass is infinitely close to the imaginary central axis of the body 10. The influence of centrifugal force on the retaining ring at high speed is greatly reduced, and the allowable speed of the retaining ring is further increased to meet the high-speed operation environment.

[0039] Specifically, as attached Figure 4 As shown, the distance between the center of mass of the main body 10 and the imaginary center axis of the main body 10 is L, L≤0.02mm. The setting of the spacing further reduces the influence of centrifugal force on the retaining ring. Since the main body 10 is not completely symmetrical, even if the calculation shows that the center of mass is exactly on the imaginary center axis of the main body 10, the position of the center of mass will be affected by the processing error. Therefore, the distance limitation is adopted to better reduce the influence of centrifugal force on the retaining ring. It should also be noted that the minimum value of L is 0, that is, the center of mass is located on the imaginary center axis of the main body 10.

[0040] Specifically, as attached Figure 3-Figure 10 As shown, the balancing portion 15 is a groove type or a hole type. The balancing portion 15 can form a structure of a balancing end portion 11 through the structure of the hollow connecting portion 12, so that the center of mass is located on the imaginary central axis of the body 10 or infinitely close to the imaginary central axis of the body 10, thereby reducing the influence of centrifugal force on the retaining ring. In this embodiment, taking the top view as an example, the self-locking structure is located in the upper area of ​​the body 10, and the balancing portion 15 is located in the lower area of ​​the body 10. When the balancing portion 15 is a hole type, the shape and size of the hole can be adjusted according to actual needs.

[0041] Specifically, as attached Figure 3-Figure 9As shown, when the balancing portion 15 is a groove type, the balancing portion 15 is open toward the outside, and the balancing portion 15 penetrates the connecting portion 12 in the axial direction. Alternatively, when the balancing portion 15 is a groove type, the balancing portion 15 is open toward the outside, and the balancing portion 15 does not penetrate the connecting portion 12 in the axial direction, for example, the balancing portion 15 penetrates the connecting portion 12 of the upper layer, but does not penetrate the connecting portion 12 of the lower layer. The shape, size and depth of the balancing portion 15 can be adjusted according to actual needs, so that the position of the center of mass can be better adjusted.

[0042] Specifically, as attached Fig.11 As shown, the balancing part 15 is a counterweight structure, and the counterweight structure is embedded in the connecting part 12. The setting of the counterweight structure makes up for the unbalanced weight effect brought by the self-locking structure and adjusts the position of the center of mass. The counterweight structure here specifically refers to digging a hole in the connecting part 12, and then filling it with a counterweight object. The density of the counterweight object is greater than the density of the main body 10, so as to achieve the effect of weight increase. In this embodiment, taking the top view as an example, the self-locking structure is located in the upper area of ​​the main body 10, and the balancing part 15 is located in the upper area of ​​the main body 10. It should also be noted that the top surface of the counterweight structure will not exceed the top surface of the upper connecting part 12, and the bottom surface of the counterweight structure will not exceed the bottom surface of the lower connecting part 12.

[0043] Specifically, the position of the center of mass can be simulated by three-dimensional software or calculated by a mathematical model. Technical personnel in this field can use relevant technical means to make the center of mass located on the imaginary central axis of the body 10, or make the center of mass infinitely close to the imaginary central axis of the body 10.

[0044] Specifically, as attached Figure 3-Figure 12 As shown, the lock hole 14 includes a first side wall 141 and a second side wall 142. The first side wall 141 is close to the cutout position of the end 11, and the second side wall 142 is far from the cutout position of the end 11. The first side wall 141 and the second side wall 142 are correspondingly arranged. For example, if the shaft retaining ring is used, the lock 13 is inclined toward the first side wall 141; if the hole retaining ring is used, the lock 13 is inclined toward the second side wall 142. For different use environments, the lock 13 is inclined in different directions.

[0045] Specifically, as attached Figure 3-Figure 12 As shown, the lock hole 14 is arranged at the end portion 11, and the lock 13 is arranged at the connecting portion 12. The lock hole 14 and the lock 13 are distributed at different positions to achieve a better matching effect. The positions of the two can also be replaced.

[0046] Specifically, the lock 13 is formed by stamping and bending, which makes the lock 13 more convenient to process.

[0047] Specifically, as attached Figure 3-Figure 12As shown, the lock 13 is close to the outer wall of the connecting portion 12, and the outer wall of the lock 13 is coplanar with the outer wall of the connecting portion 12. The lock hole 14 is also located outside the end 11. In this embodiment, the lock hole 14 is an arc hole, and the lock 13 is formed by stamping and bending. In addition, other structural methods can also be used to form a limit, such as a protrusion and a groove.

[0048] Specifically, the two ends 11 are offset in the axial direction. When axial projection is performed, the two ends 11 have no intersection.

[0049] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A retaining ring, comprising a body (10) wound from a flat metal wire, wherein the body (10) has at least two layers, and is characterized in that: The body (10) comprises two end portions (11) and a connecting portion (12) connecting the two end portions (11), and a self-locking structure is provided at the matching position between the two end portions (11) and the connecting portion (12), and the self-locking structure comprises a lock (13) and a lock hole (14); The connecting portion (12) is provided with a balancing portion (15), the balancing portion (15) balances the center of mass of the body (10), and the center of mass of the body (10) is located on the imaginary central axis of the body (10); or, the balancing portion (15) balances the center of mass of the body (10), and the center of mass of the body (10) is close to the imaginary central axis of the body (10); In the first state, the lock (13) has not entered the lock hole (14); In the second state, the retaining ring cooperates with the installation object, and the lock (13) enters into the lock hole (14) and cooperates with the side wall of the lock hole (14); In the third state, the retaining ring enters into the groove of the installation object, and the lock (13) moves in the direction in which the lock (13) enters into the lock hole (14).

2. The retaining ring according to claim 1, characterized in that: The distance between the center of mass of the body (10) and the imaginary central axis of the body (10) is L, and L≤0.02 mm.

3. The retaining ring according to claim 1, characterized in that: The balancing portion (15) is a groove type or a hole type.

4. The retaining ring according to claim 3, characterized in that: When the balancing portion (15) is groove-shaped, the balancing portion (15) is open toward the outside, and the balancing portion (15) penetrates the connecting portion (12) in the axial direction; or, when the balancing portion (15) is groove-shaped, the balancing portion (15) is open toward the outside, and the balancing portion (15) does not penetrate the connecting portion (12) in the axial direction.

5. The retaining ring according to claim 1, characterized in that: The balancing portion (15) is a counterweight structure, and the counterweight structure is embedded in the connecting portion (12).

6. The retaining ring according to claim 1, characterized in that: The lock hole (14) comprises a first side wall (141) and a second side wall (142), and the lock (13) is inclined toward the first side wall (141); or the lock (13) is inclined toward the second side wall (142).

7. The retaining ring according to claim 1 or 6, characterized in that: The lock hole (14) is arranged at the end portion (11), and the lock (13) is arranged at the connecting portion (12).

8. The retaining ring according to claim 1 or 6, characterized in that: The lock (13) is formed by stamping and bending.

9. The retaining ring according to claim 1, characterized in that: The two ends (11) are offset in the axial direction.

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