How to install elastic retaining rings

Abstract

The present invention relates to the technical field of automated installation of elastic retaining rings, and more specifically, to an installation method for such retaining rings. The method includes a guide bush, a shaft to be installed with a groove, and a push-down sleeve, the guide bush including a tapered portion whose narrow end radial dimension is smaller than the locking bore diameter of the retaining ring body and whose wide end radial dimension is larger than the locking bore diameter of the retaining ring body, the guide bush being coaxially coupled to the front end of the corresponding groove in the shaft to be installed with the wide end of the tapered portion facing the groove, the push-down sleeve being fitted onto the outside of the guide bush and movable in the axial direction of the guide bush, and a tripping protrusion being provided on the push-down sleeve on the side closer to the shaft to be installed. The unlocking operation for the elastic retaining ring can be completed automatically, which is suitable for automated production and improves production efficiency.

Description

[Technical Field]

[0001] The present invention relates to the technical field of automatic installation of elastic retaining rings, and more particularly to an installation method of elastic retaining rings. [Background technology]

[0002] As shown in Figures 1 to 3, the elastic retaining ring is initially in a locked-up state, and during the outward expansion process, the locking lamination surfaces of the position-regulating protrusions at both ends are stuck together, preventing further expansion. When the elastic retaining ring is attached to a high-speed rotating shaft and the shaft's rotation speed reaches a certain value, the retaining ring body expands outward from the locked-up state. Once it has expanded outward to a certain extent, the pair of locking lamination surfaces are stuck together and lock together, preventing further outward expansion of the retaining ring body until it reaches an outward-expanded, detached state. Therefore, it can be used on high-speed rotating shafts and is highly reliable.

[0003] When assembling the elastic retaining ring into the groove of the shaft to which it is attached, an unlocking operation is required. That is, the elastic retaining ring must be unlocked from a locked-up state to an outwardly expanded, released state so that the elastic retaining ring can pass through the shaft portion at the front end of the groove. One unlocking method is to hold the elastic retaining ring using a clamping member and separate both ends. However, when assembling a large number of elastic retaining rings and designing an automated assembly production line, this method requires two steps: attaching the clamping member to the elastic retaining ring and then removing the clamping member. This operation is quite complex and not suitable for automated installation. Summary of the Invention [Problem to be solved by the invention]

[0004] In order to overcome the drawbacks of the above-mentioned existing technology, the present invention provides a method for installing an elastic retaining ring for preventing it from coming off, which can automatically complete the unlocking operation for the elastic retaining ring, is suitable for automated production, and can improve production efficiency. [Means for solving the problem]

[0005] In order to achieve the above object, the present invention is realized by the following technical aspects. An attachment device for an elastic retaining ring for preventing disengagement, used to attach a retaining ring body to a groove in a shaft to be attached, the ratio of the thickness of the retaining ring body to the width of the groove being 1:2 or more, the device including a guide bush, a shaft to be attached provided with a groove, and a push-down sleeve; the guide bush includes a tapered portion, a narrow end radial dimension of the tapered portion being smaller than a locking diameter of the retaining ring body, and a wide end radial dimension of the tapered portion being larger than the locking diameter of the retaining ring body, the guide bush being coaxially coupled to a front end of a corresponding groove of a shaft to be attached, and the wide end of the tapered portion being oriented toward the groove; the push-down sleeve is fitted onto the outside of the guide bush and is movable in the axial direction of the guide bush, and a tripping protrusion is provided on the push-down sleeve on a side closer to the attachment shaft, The push-down sleeve can push the retaining ring body fitted over the tapered portion to move it toward the groove, and in this process, the tripping protrusion can push one end of the retaining ring body on the opening side, causing both ends of the opening of the retaining ring body to shift in the axial direction. This achieves axial unlocking of the retaining ring, so the mounting device for the elastic retaining ring described in this application can automatically complete the unlocking operation for the elastic retaining ring, making it suitable for automated production and improving production efficiency.

[0006] It should be explained that when the retaining ring body expands outward from the lock-up state until the pair of locking lamination surfaces are bonded and locked together, the diameter at this time becomes the locking diameter, i.e., the locking diameter is the maximum diameter when the retaining ring body is in the lock-up state, and when the retaining ring body is in the axially unlocked state, the pair of locking lamination surfaces do not come into contact with each other when the retaining ring body expands outward, so in this state the retaining ring body can continue to expand outward until it reaches the outwardly expanded and released state. Note that, since the present application defines a case in which the guide bush includes a tapered portion, it does not exclude the possibility of providing an extension portion between the wide end of the corresponding tapered portion of the guide bush and the groove, the range of the radial dimension of which is greater than the locking diameter and less than the radial dimension of the wide end of the tapered portion.

[0007] In the mounting device for the elastic retaining ring, the tripping protrusion is provided on an axial end surface of the retaining ring body. As a preferred aspect of the present application, the above structure has the advantage that when the push-down sleeve is used to press the tripping protrusion, it is not necessary to position the push-down sleeve in the circumferential direction, thereby simplifying control.

[0008] Furthermore, in the mounting device for the elastic retaining ring, the tripping protrusion is provided on the end surface of the push-down sleeve. In a preferred embodiment of the present application, the tripping protrusion is provided on the retaining ring body in two ways: first, the tripping protrusion is attached to the retaining ring body as a separate piece, which requires an additional operation step of pushing the retaining ring body into the groove and then removing the tripping protrusion, thereby affecting assembly efficiency; and second, the tripping protrusion is provided extending from the retaining ring body, which increases the complexity of the manufacturing process for the retaining ring body, increases the manufacturing cost of the retaining ring body, and further affects the compactness of the axial mounting of the retaining ring body. By providing the tripping protrusion on the push-down sleeve, the drawbacks of providing the tripping protrusion on the retaining ring body can be overcome.

[0009] Furthermore, in the mounting device for the elastic retaining ring, a transitional bonding surface is formed on one side of the tripping protrusion so as to extend spirally in the circumferential and axial directions of the push-down sleeve. In a preferred aspect of the present application, when the tripping protrusion pushes up one end of the retaining ring body on the opening side, the entire retaining ring body is bonded to the transitional bonding surface, thereby improving stability when the retaining ring body is pushed by the push-down sleeve.

[0010] Furthermore, in the mounting device for the elastic retaining ring, the push-down sleeve is rotatable in the circumferential direction of the shaft to be mounted. In a preferred embodiment of the present application, if, after step S41 is completed, one end of the retaining ring body is pushed into the groove and the other end cannot automatically enter the groove due to its own repulsive force, step S42' is performed to rotate the push-down sleeve inward in the circumferential direction of the end of the retaining ring body that is pushed into the corresponding groove, and at this time, the portion that has not entered the groove is pushed into the groove by the tripping protrusion, thereby ensuring that both ends of the retaining ring body can enter the groove.

[0011] A method of using the mounting device for the elastic retaining ring for retaining, including the following steps S11 to S42: Step S11 is the axial lock release, in which the retaining ring body is placed over the tapered portion from the narrow end of the tapered portion, the push-down sleeve moves toward the retaining ring body, and the tripping protrusion pushes one end of the retaining ring body to move it and enter an axial lock release state; Step S12 is a radial unlocking step, in which the push-down sleeve pushes the retaining ring body toward the wide end of the tapered portion until the retaining ring body enters an outwardly expanded and released state; Step S2' is expansion, in which the push-down sleeve pushes the retaining ring body toward the wide end of the tapered portion, expanding the retaining ring body until its inner diameter is equal to or greater than the shaft diameter of the front end of the corresponding groove of the shaft to be attached, and it should be noted that the diameter of the journal at the front end of the groove is greater than the locking diameter of the retaining ring body.

[0012] Step S3' is movement, in which the push-down sleeve continues to push and move the retaining ring body, and moves the retaining ring body axially until the front end of the retaining ring body is axially outside the groove, specifically, when the end of the guide bush is attached to the outer edge of the groove, the entire retaining ring body is placed on the guide bush.

[0013] Step S41 is the insertion of one end into the groove, and the push-down sleeve pushes the retaining ring body until the one end pushed out by the tripping protrusion of the retaining ring body enters the groove; Step S42 is the entire insertion into the groove, and when one end of the retaining ring body enters the groove, the other end follows the one end and simultaneously enters the groove due to the action of the repulsive force. It should be noted that the automatic insertion of the other end into the groove is the effect of the combined action of the axial and circumferential elastic forces of the retaining ring body, and the premise for realizing this effect is also related to the groove depth and the dimensional parameters of the journal at the outer end of the groove. [Effects of the Invention]

[0014] As can be seen from the above technical aspects, the present invention has the following beneficial effects. 1. The present invention provides a method for installing an elastic retaining ring to prevent it from coming off, which can automatically complete the unlocking operation of the elastic retaining ring, making it suitable for automated production and improving production efficiency. 2. The present invention provides a method for installing an elastic retaining ring, in which the ratio of the thickness of the retaining ring body to the width of the groove is 1:2 or more, so that after one end of the retaining ring body is pushed in, the other end cannot be directly pushed into the groove by the push-down sleeve due to the position restriction of the groove, but the retaining ring body can use its own axial repulsive force to cause the other end to follow the one end and enter the groove. Therefore, the installation method for an elastic retaining ring described in this application overcomes the technical prejudice of conventional retaining rings that the entire retaining ring must be pushed into the groove by the push-down sleeve, and produces technical effects unexpected to those skilled in the art, with the advantage of high overall installation efficiency. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic diagram of the structure of an elastic retaining ring capable of rebound and self-locking to prevent slip-out, according to one embodiment of the present application, in an initial state. FIG. [Figure 2] 2 is a partial enlarged view of the corresponding opening in FIG. 1. [Figure 3] 10 is a schematic diagram of the resilient and self-locking retaining elastic retaining ring when the locking lamination surfaces are bonded together in a locked-up state. FIG. [Figure 4] 10 is a schematic diagram of the resilient and self-locking retaining elastic snap ring in an outwardly expanded detached state. FIG. [Figure 5] FIG. 10 is a schematic diagram showing the inclined guide surface as an inclined plane. [Figure 6] 1 is a structural schematic diagram of a mounting device for an elastic retaining ring for preventing disengagement according to one embodiment of the present application (the tripping protrusion is on the retaining ring body). FIG. [Figure 7] 1 is a structural schematic diagram of a mounting device for a retaining elastic snap ring according to one embodiment of the present application (the tripping protrusion is on the push-down sleeve). FIG. [Figure 8] 1 is a structural schematic diagram of a push-down sleeve in a mounting device for an elastic retaining ring for preventing slip-out, according to one embodiment of the present application. [Figure 9] 1 is a structural schematic diagram of a mounting device for an elastic retaining ring for preventing slipping out, according to one embodiment of the present application. [Figure 10]10 is a schematic diagram of step S11 in a method of using the mounting device for the elastic retaining ring according to one embodiment of the present application. FIG. [Figure 11] 10 is a schematic diagram of step S12 in a method of using the mounting device for the elastic retaining ring according to one embodiment of the present application. FIG. [Figure 12] 10 is a schematic diagram of step S41 in a method of using the mounting device for the elastic retaining ring according to one embodiment of the present application. FIG. [Figure 13] FIG. 10 is a schematic diagram showing the retaining ring body completely inserted into the groove. [Figure 14] FIG. 14 is a cross-sectional view of FIG. 13. DETAILED DESCRIPTION OF THE INVENTION

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description of the preferred embodiments of the present invention is provided by way of example in the accompanying drawings, in which the same or similar reference numerals throughout the drawings indicate the same or similar elements or elements having the same or similar functions. The following description of the preferred embodiments with reference to the accompanying drawings is for illustrative purposes only and is used to explain the present invention, but should not be construed as a limitation on the present invention.

[0017] In describing the present invention, it should be understood that the orientations or positional relationships indicated by terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," "counterclockwise," etc. are based on the orientations or positional relationships shown in the drawings and are used to facilitate the description of the present invention and simplify the explanation, but do not indicate or imply that the devices or elements shown must have a particular orientation or be constructed and operated in a particular orientation, and should not be understood as limitations on the present invention.

[0018] Furthermore, the terms "first" and "second" are merely descriptive and do not indicate or imply relative importance, nor do they implicitly indicate the quantity of the indicated technical features. Thus, a feature qualified by "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of the present invention, "plurality" means two or more, unless expressly limited otherwise.

[0019] In the present invention, unless otherwise specified or otherwise stated, terms such as "attach," "couple," "connect," and "fix" should be understood in a broad sense, and may refer to, for example, a fixed connection or a detachable connection. Or, an integral connection. Or, a mechanical connection or an electrical connection. Or, a direct connection or an indirect connection via an intermediate medium. Or, an internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0020] In the present invention, unless otherwise specified or otherwise stated, a first feature being "above" or "below" a second feature may include direct contact between the first and second features, or may include contact between the first and second features via another feature between them without direct contact. Furthermore, a first feature being "above" a second feature, "above" a second feature, and "above" a second feature may include the first feature being directly above and diagonally above the second feature, or may simply indicate that the horizontal height of the first feature is higher than that of the second feature. A first feature being "below" a second feature, "below" a second feature, and "below" a second feature may include the first feature being directly below and diagonally below the second feature, or may simply indicate that the horizontal height of the first feature is smaller than that of the second feature.

[0021] Example 1 As shown in FIGS. 1 and 2, the resilient and self-locking retaining retaining ring includes a retaining ring body 1, an opening 10 is provided in the retaining ring body 1, and both ends of the retaining ring body 1 correspond to both sides of the opening 10 and are respectively a first end 11 and a second end 12; When the retaining ring body 1 is in an initial state, the first end portion 11 and the second end portion 12 alternate (interlock) with each other, and a first connecting extension portion 111 and a second connecting extension portion 121 are provided at the front ends of the first end portion 11 and the second end portion 12 corresponding to the positions where the front ends of the first end portion 11 and the second end portion 12 alternate with each other, and a first position restricting protrusion 112 and a second position restricting protrusion 122 are provided at the first connecting extension portion 111 and the second connecting extension portion 121, respectively, extending laterally, and the first position restricting protrusion 112 and the second position restricting protrusion The first position restricting protrusion 112 and the second position restricting protrusion 122 are located on the circumferential inside of the corresponding retaining ring body 1, and a locking bonding surface 130 is provided on the proximal side of the first position restricting protrusion 112 and the second position restricting protrusion 122, and an inclined guide surface 14 is provided on the side of the first position restricting protrusion 112 farther from the second position restricting protrusion 122 and / or the side of the second position restricting protrusion 122 farther from the first position restricting protrusion 112, and in this embodiment, the first position restricting protrusion 112 and the second position restricting protrusion 122 are each provided with an inclined guide surface 14. The first position restricting protrusion 112 and the second position restricting protrusion 122 are provided at the front ends of the first connecting extension portion 111 and the second connecting extension portion 121, respectively.

[0022] When the retaining ring body 1 expands outward from the locked-up state, the pair of locking bonding surfaces 130 are bonded together and locked together, preventing the retaining ring body 1 from expanding outward until it reaches the outward expanded and detached state. The inclined guide surface 14 allows the retaining ring body 1 to return from the outwardly expanded detached state to the locked-up state by its own repulsive force.

[0023] In the above structure, as shown in FIG. 2 , the first connecting extension portion 111 and the second connecting extension portion 121 alternate with each other, that is, the first connecting extension portion 111 is on one side of the second connecting extension portion 121, and the front end of the first connecting extension portion 111 extends to between the end and root of the second connecting extension portion 121, and it can also be understood that the first connecting extension portion 111 and the second connecting extension portion 121 are arranged alternately with each other in the circumferential direction of the corresponding retaining ring body 1. The first position restricting protrusion 112 and the second position restricting protrusion 122 are located inside each other in the circumferential direction of the corresponding retaining ring body 1, that is, the first position restricting protrusion 112 is located on the side of the second position restricting protrusion 122 farther from the outer end of the second connecting extension portion 121, and the first position restricting protrusion 112 and the second position restricting protrusion 122 are located outside each other in the circumferential direction of the corresponding retaining ring body 1, that is, the first position restricting protrusion 112 is located on the side of the second position restricting protrusion 122 closer to the outer end of the second connecting extension portion 121. In this embodiment, the first position restricting protrusion 112 and the second position restricting protrusion 122 are provided on the adjacent sides of the first connecting extension portion 111 and the second connecting extension portion 121, and are provided extending away from each other. The first position regulating protrusion 112 and the second position regulating protrusion 122 alternate with each other in the extension direction, and specifically, the inclined guide surface 14 is provided on the outside of the front end of the position regulating protrusion in the extension direction, and in this embodiment, the inclined guide surface 14 is an arc surface and has a curved shape.

[0024] The principle of the rebound and self-locking elastic retaining retaining ring is as follows: as shown in Figures 2 and 3, when a pair of locking mating surfaces 130 face each other, the first position restricting protrusion 112 and the second position restricting protrusion 122 are located on the circumferential inside of the corresponding retaining ring body 1, and the retaining ring body 1 is in a locked-up state; and as shown in Figure 4, when the pair of locking mating surfaces 130 face each other, particularly when the first position restricting protrusion 112 and the second position restricting protrusion 122 are located on the circumferential outside of the corresponding retaining ring body 1, the retaining ring body 1 is in an outward expanded detached state. Therefore, the retaining ring body 1 is in a locked-up state in the initial state, and when the retaining ring body 1 is attached to the groove of the shaft, the retaining ring body 1 is in a locked-up state, so its own elastic force will not cause the retaining ring body 1 to detach, providing excellent stability. When attached to a high-speed rotating shaft, the retaining ring body 1 expands outward from the locked-up state when the shaft's rotation speed reaches a certain value, and when it expands outward to a certain extent, the pair of locking mating surfaces 130 are mated and locked together, preventing the retaining ring body 1 from expanding outward until it reaches the outward-expanded detached state. Therefore, the rebound and self-locking elastic retaining retaining ring described in this application is applicable to high-speed rotating shafts, and is an integrated design, has a simple structure, low manufacturing costs, and good reliability.When the retaining ring body 1 enters an outwardly expanded detached state due to an external force, the first position restriction protrusion 112 and the second position restriction protrusion 122 are located outside each other, and the inclined guide surface 14 is located between the first position restriction protrusion 112 and the second position restriction protrusion 122. When the external force acting on the retaining ring body 1 is reduced or eliminated, the first position restriction protrusion 112 and the second position restriction protrusion 122 come into contact with each other on the outside due to the repulsive force of the retaining ring body 1 itself, and because the first position restriction protrusion 112 and the second position restriction protrusion 122 are alternately positioned, the first position restriction protrusion 112 and the second position restriction protrusion 122 come into contact with each other on the outside. At this time, the inclined guide surface 14 acts to push the first connecting extension portion 111 and the second connecting extension portion 121 apart, causing the first position restriction protrusion 112 and the second position restriction protrusion 122 to move to the circumferentially inner side of the corresponding retaining ring body 1, and automatic return to the lock-up state is achieved via the repulsive force. According to the above principle, the resilient and self-locking elastic retaining ring for preventing slip-out described in the present application can eliminate the need for an actuator to perform the locking operation during automatic assembly, and therefore can eliminate the operating time for the locking operation, thereby improving assembly efficiency and making it suitable for automatic production.

[0025] In this embodiment, the retaining ring body 1 has an overall sheet-like shape in its initial state. Therefore, the resilient and self-locking retaining elastic retaining ring according to the present application can be directly formed from a sheet material using a primary forming machining process such as wire cutting or pressing, resulting in low manufacturing costs and economic efficiency. Specifically, in this embodiment, the retaining ring body 1 has an overall trapezoidal ring shape, and both axial end surfaces of the retaining ring body 1 are flat. It can be formed by primary forming using a spring steel plate by pressing or wire cutting. The above structure differs from the elastic retaining ring for an electric vehicle reducer shaft disclosed in Chinese patent application No. 202121468092.8, which has a spiral shape in its initial state, resulting in a complex manufacturing process and high costs.

[0026] As shown in Figures 1 and 2, in this embodiment, when the retaining ring body 1 is in its initial state, the second connecting extension portion 121 is radially outside the retaining ring body 1 corresponding to the first connecting extension portion 111.

[0027] The first connecting extension portion 111 and the second connecting extension portion 121 are spaced apart in the radial direction and in the axial direction, which makes them easy to process and reduces manufacturing costs, while allowing the width of the corresponding groove into which the retaining ring body 1 is attached to be small, i.e., after attachment, the axial movement space of the retaining ring body 1 is small.

[0028] As shown in FIG. 1 , in this embodiment, the retaining ring body 1 further includes removal holes 15, and the removal holes 15 include a first removal hole 151 provided at the second end 12. When the retaining ring body 1 is installed in the groove, it is in a locked-up state. By using a tool to apply force radially outward to the retaining ring body 1 through the first removal hole 151, the second connecting extension portion 121 can be opened until the retaining ring body 1 is in an outwardly expanded and detached state, thereby realizing removal of the retaining ring body 1 installed in the groove. In this embodiment, the removal holes 15 further include a second removal hole 152 provided at the first end 11. The removal holes 15 are provided in pairs at both ends of the retaining ring body 1 so that the retaining ring body 1 installed in the groove can be easily removed by inserting a pair of circlip pliers into the pair of removal holes 15. In the present application, the first detachment hole 151 and the second detachment hole 152 are provided at the root portions of the corresponding second connecting extension portion 121 and first connecting extension portion 111 of the second end portion 12 and the first end portion 11, respectively.

[0029] 2, in this embodiment, the front ends of the first position restriction protrusion 112 and the second position restriction protrusion 122 in the extending direction extend circumferentially inward of the corresponding retaining ring body 1 to form a pair of hook portions 13 that can be hooked to each other, and the locking mating surface 130 is provided on the inside of the hook portions 13. The use of a hook portion structure that locks together has the advantage of ensuring a reliable locking effect. It should be noted that the structure that can achieve mutual locking is not limited to the hook portion 13 described in this embodiment, but may also be a position restriction engagement structure such as mutually engaging teeth or female-male engaging protrusions and recesses.

[0030] 2, in this embodiment, when the retaining ring body 1 is in its initial state, the first position restricting protrusion 112 and the second position restricting protrusion 122 are spaced apart by a predetermined distance a. Based on the above structure, the inner diameter of the retaining ring body 1 in its initial state may be smaller than the diameter of the corresponding groove, and when the retaining ring body 1 is installed in the groove, the distance between the first position restricting protrusion 112 and the second position restricting protrusion 122 is reduced to the predetermined distance, thereby generating a certain tightening force in the retaining ring body 1 and preventing rattling when the retaining ring body 1 is installed in the groove.

[0031] As shown in FIG. 10, in this embodiment, when the first position restriction protrusion 112 and the second position restriction protrusion 122 are shifted from each other by a predetermined distance in the axial direction, the retaining ring body 1 is in an axially unlocked state, and the retaining ring body 1 can return from the axially unlocked state to the locked-up state by its own repulsive force.

[0032] As shown in Figures 10 to 13, when the retaining ring body 1 is in the axially unlocked state, the pair of locking mating surfaces 130 do not come into contact with each other as the retaining ring body 1 expands outward. Therefore, the retaining ring body 1 can continue to expand outward until it reaches the outward expansion / detachment state. Achieving this function depends on the material properties and structural parameters of the retaining ring body 1. In this embodiment, the retaining ring body 1 is made of spring steel, and the overall dimensional parameters of the retaining ring body 1 are designed with reference to the snap ring in the GB / T 894-2017 standard. As long as the dimensions of the corresponding mounting groove comply with this standard, the above function can be achieved. This also has the advantage of being versatile, allowing the dimensional parameters to be adaptively modified for specific applications.

[0033] Specifically, the retaining ring body 1 has an inner diameter of 45.8 mm, an outer diameter of 56 mm, a thickness of 2 mm, and is made of 60Si2Mn. When the second connecting extension portion 121 is pressed down until the axial displacement of the second position restricting protrusion 122 is greater than 2 mm, the retaining ring body 1 enters an axially unlocked state. When the force pressing down the second connecting extension portion 121 is released without applying a radial outward expanding force, the retaining ring body 1 can return from the axially unlocked state to the locked state by its own repulsive force.

[0034] Example 2 As shown in FIG. 5, this embodiment differs from the first embodiment in that the inclined guide surface 14 is an inclined plane and is chamfered.

[0035] Example 3 As shown in FIG. 6, the mounting device for the elastic retaining ring includes a guide bush 2, a mounting shaft 4 having a groove 41, and a push-down sleeve 3. The shaft 4 to be attached is fixed by a fixing assembly (not shown), the guide bush 2 includes a tapered portion 21, the narrow end radial dimension of the tapered portion 21 is smaller than the locking diameter of the retaining ring body 1, and the wide end radial dimension of the tapered portion 21 is larger than the locking diameter of the retaining ring body 1, the guide bush 2 is coaxially coupled to the front end of a corresponding groove 41 of the shaft 4 to be attached, and the wide end of the tapered portion 21 faces the groove 41, The push-down sleeve 3 is provided on the outside of the guide bush 2 and is movable in the axial direction of the guide bush 2. A tripping protrusion 5 is provided on the side of the push-down sleeve 3 closer to the shaft 4 to be attached. When used in an automated assembly production line, the push-down sleeve 3 is connected to a linear drive device (not shown), and the linear drive device drives the push-down sleeve 3 to achieve axial movement.

[0036] The push-down sleeve 3 can push the retaining ring body 1 fitted into the tapered portion 21 to move it toward the groove 41, and in this process, the tripping protrusion 5 can push one end of the retaining ring body 1 on the opening 10 side, and shift the locking bonding surfaces 130 on both sides of the retaining ring body 1 in the axial direction until the retaining ring body 1 enters the axial unlocked state.

[0037] 3, when the retaining ring body 1 expands outward from the lock-up state until the pair of locking lamination surfaces 130 are mated and locked together, the hole diameter at this time becomes the locking diameter. That is, the locking diameter is the maximum hole diameter when the retaining ring body 1 is in the lock-up state. When the retaining ring body 1 is in the axially unlocked state, the pair of locking lamination surfaces 130 do not come into contact with each other as the retaining ring body 1 expands outward. Therefore, in this state, the retaining ring body 1 can continue to expand outward until it reaches the outwardly expanded and released state. Note that, because the present application defines the case where the guide bush 2 includes a tapered portion 21, it does not exclude the possibility of providing an extension portion between the wide end of the corresponding tapered portion 21 of the guide bush 2 and the groove 41, the range of the radial dimension of which is greater than the locking diameter and less than the radial dimension of the wide end of the tapered portion 21.

[0038] In this embodiment, the outer edge of the cross section of the tapered portion 21 is circular. The axial dimension of the retaining ring body 1 is greater than the thickness of the retaining ring body 1.

[0039] 6, in this embodiment, the tripping protrusion 5 is provided on the axial end surface of the retaining ring body 1. Specifically, the tripping protrusion 5 is provided on the end surface of the first end portion 11 or the second end portion 12. According to the above structure, when the tripping protrusion 5 is pressed using the push-down sleeve 3, there is no need to position the push-down sleeve 3 in the circumferential direction, which has the advantage of simplifying control.

[0040] In this embodiment, the tripping protrusion 5 is a pin, and is provided so as to be detachably attached in one of the removal holes 15 .

[0041] Example 4 As shown in FIG. 7, this embodiment differs from the third embodiment in that the tripping protrusion 5 is provided on the end surface of the push-down sleeve 3.

[0042] In addition to Example 3, there are two cases where the tripping protrusion 5 is provided on the retaining ring body 1. The first is a case where the tripping protrusion 5 is provided on the retaining ring body 1 as a separate member, as in Example 4. In this case, an additional operation step of removing the tripping protrusion 5 after pushing the retaining ring body 1 into the groove 41 is required, which affects assembly efficiency. The second is a case where the tripping protrusion 5 is provided extending from the retaining ring body 1. This increases the complexity of the manufacturing process of the retaining ring body 1, which increases the manufacturing cost of the retaining ring body 1 and further affects the compactness of the axial mounting of the retaining ring body 1.

[0043] In this embodiment, the tripping protrusion 5 is provided on the push-down sleeve 3, thereby overcoming the drawback of providing the tripping protrusion 5 on the retaining ring body 1. It should be noted that, to achieve automatic assembly, the tripping protrusion 5 must be aligned with one end of the retaining ring body 1 on the corresponding opening 10 side; both ends must not be pushed down at the same time. Otherwise, assembly will fail. To ensure this circumferential positioning, an automatic manipulator can be used to feed material. Specifically, the manipulator can be used to separate and remove the retaining ring bodies 1 that have been pre-positioned (to achieve pre-positioning, multiple retaining ring bodies 1 can be placed in a material tray for circumferential positioning from a raw material pallet), place the retaining ring bodies 1 on the tapered portion 21 at a predetermined circumferential angle according to a preset program, and then move the push-down sleeve 3. This ensures the above function.

[0044] Example 5 As shown in Figures 8 to 14, in addition to Example 4, in this example, a transition bonding surface 51 is formed on one side of the tripping protrusion 5, extending spirally in the circumferential and axial directions of the push-down sleeve 3.

[0045] When the tripping protrusion 5 pushes up one end of the retaining ring body 1 on the opening 10 side, the entire retaining ring body 1 is bonded to the transition bonding surface 51, thereby improving the stability when the retaining ring body 1 is pushed by the push-down sleeve 3. In this embodiment, the tripping protrusion 5 and the push-down sleeve 3 are integrally molded, the tripping protrusion 5 is stepped, and the transition bonding surface 51 extends spirally from the front end of the tripping protrusion 5 to the base of the tripping protrusion 5.

[0046] Example 6 The method for attaching the rebound and self-locking elastic retaining ring described in Examples 1 and 2 of the present application includes the following steps S1 to S4: Step S1 is to release the lock, and the retaining ring body 1 is brought from the initial state to the outward expanded and separated state. Step S2 is expansion, in which the retaining ring body 1 is expanded until its inner diameter becomes equal to or larger than the shaft diameter of the shaft 4 to be attached. Step S3 is movement, in which the retaining ring body 1 is moved axially outward from the groove 41. Specifically, in response to this step, the retaining ring body 1 can be moved axially onto the front journal of the corresponding groove 41 of the shaft 4 to be attached. At this time, when the spreading force applied to the retaining ring body 1 is removed, the retaining ring body 1 is fitted onto the journal of the shaft 4 to be attached in an outward expanded detached state.

[0047] Step S4 is entering the groove, in which the retaining ring body 1 is moved axially to enter the groove 41, and at this time, the retaining ring body 1 returns from the outward expanded detached state to the lock-up state due to its own repulsive force, and is fitted into the groove 41.

[0048] According to the above method, the resilient and self-locking elastic retaining ring for preventing slip-out described in the present application can eliminate the need for an actuator to perform the locking operation during automatic assembly, and therefore can eliminate the operating cycle time for the locking operation, thereby improving assembly efficiency and making it suitable for automatic production.

[0049] Example 7 A method of using the mounting device for the elastic retaining snap ring according to Examples 3 to 5 to mount the rebound and self-locking elastic retaining snap ring according to Examples 1 and 2 includes the following steps S11 to S42, as shown in FIGS. 9 to 14 (taking Example 5 as an example): Step S11 is the axial lock release, in which the retaining ring body 1 is placed over the tapered portion 21 from the narrow end of the tapered portion 21, the push-down sleeve 3 moves toward the retaining ring body 1, and the tripping protrusion 5 pushes one end of the retaining ring body 1 to move it and enter an axial lock release state; Step S12 is a radial unlocking step, in which the push-down sleeve 3 pushes the retaining ring body 1 toward the wide end of the tapered portion 21 until the retaining ring body 1 enters an outwardly expanded detached state, where steps S11 and S12 correspond to step S1 in Example 6.

[0050] Step S2' is expansion, in which the push-down sleeve 3 pushes the retaining ring body 1 toward the wide end of the tapered portion 21, expanding the retaining ring body 1 until its inner diameter is equal to or greater than the shaft diameter of the front end of the corresponding groove 41 of the shaft 4 to be attached. It should be noted that the journal diameter of the front end of the groove 41 is greater than the locking diameter of the retaining ring body 1. In this embodiment, step S2' corresponds to step S2 in embodiment 6.

[0051] Step S3' is a movement, in which the push-down sleeve 3 continues to push and move the retaining ring body 1, and the retaining ring body 1 is moved axially until the front end of the retaining ring body 1 is axially outside the groove 41, specifically, when the end of the guide bush 2 is attached to the outer edge of the groove 41, the entire retaining ring body 1 is placed on the guide bush 2. In this embodiment, the end of the guide bush 2 is axially attached to the journal at the front end of the groove 41, so that in this step the retaining ring body 1 is moved axially onto the journal on the front side of the groove 41. In this embodiment, step S3' corresponds to step S3 in Example 6.

[0052] Step S41 is the insertion of one end into the groove, and the push-down sleeve 3 pushes the retaining ring body 1 until the one end of the retaining ring body 1 pushed out by the tripping protrusion 5 enters the groove 41, Step S42 is the entire insertion into the groove. When one end of the retaining ring body 1 enters the groove, the other end follows and simultaneously enters the groove due to the action of a repulsive force. Steps S41 and S42 correspond to step S4 in Example 6. It should be noted that the automatic insertion of the other end into the groove is the effect of the combined action of the axial and circumferential elastic forces of the retaining ring body 1. The realization of this effect is predicated on the depth of the groove 41 and the dimensional parameters of the journal at the outer end of the groove 41. In this example, the retaining ring body 1 is made of spring steel, and its overall dimensional parameters, as well as the dimensional parameters of the groove 41 and journal, comply with the provisions for snap rings in the GB / T 894-2017 standard. Sample tests have shown that the effects described in steps S41 to S42 can be achieved. In the experiment, the retaining ring body 1 had an inner diameter of 45.8 mm, an outer diameter of 56 mm, a thickness of 2 mm, and was made of 60Si2Mn, and the inner diameter of the groove 41 was 47 mm and the width of the groove 41 was 2.15 mm. Even by testing the above method using a standard ring, the effect of the other end following and entering the groove described in step S42 was achieved.

[0053] It should be noted that the method described in this embodiment overcomes the technical prejudice of the conventional retaining ring installation, in which the entire retaining ring must be pressed into the groove by the push-down sleeve 3. For example, patent document CN103639980A discloses a retaining ring installation tool for shafts. This patent document provides an embodiment in which an elastic retaining ring is pressed into a mounting groove by a pressing cylinder. In this embodiment, the retaining ring is arranged parallel to the mounting groove before being pressed into the mounting groove, i.e., the entire retaining ring is pressed into the mounting groove. Therefore, the effect is predictable, and the retaining ring necessarily enters the mounting groove completely.

[0054] In contrast, in the present application, the ratio of the thickness of the retaining ring body 1 to the width of the groove 41 is 1:2 or greater. In particular, in accordance with the Chinese national standard GB / T 894-2017 Elastic Retaining Rings for Shafts, this ratio can be as high as 4:5 or greater. In this embodiment, the ratio is 2:2.15. One end of the retaining ring body 1 is pushed into the groove, and the other end follows due to a repulsive force and enters the groove. This effect would be difficult for a person skilled in the art to predict based on existing technology.

[0055] Specifically, as shown in FIG. 12 , when one end of the retaining ring body 1 is pushed into the groove 41, the push-down sleeve 3 is axially restricted by the end face of the groove 41 and stops moving. At this time, the end of the retaining ring body 1 that is not pushed into the groove 41 cannot be directly pushed into the groove 41 by the push-down sleeve. Meanwhile, the distance by which both ends of the retaining ring body 1 in the axially unlocked state are displaced in the axial direction is equal to or greater than the thickness of the retaining ring body 1. Therefore, it is difficult for a person skilled in the art to predict whether, after one end of the retaining ring body enters the groove, the other end can overcome the resistance of the tapered portion 21 or the attached shaft 4 with its own repulsive force and repel to enter the groove 41. In particular, as shown in FIGS. 10 and 12 , both ends of the retaining ring body are displaced in the axial direction before one end enters the groove. That is, the axial repulsive force of the retaining ring body itself cannot overcome the resistance of the tapered portion 21 or the attached shaft 4 to make both ends of the retaining ring body 1 flush. Therefore, the technical aspect of this embodiment overcomes the technical prejudice of the conventional retaining ring that the entire retaining ring must be pushed down and pressed into the groove by the sleeve 3.

[0056] Example 8 In addition to the fourth or fifth embodiment, in this embodiment, the push-down sleeve 3 is rotatable in the circumferential direction of the attachment shaft 4.

[0057] When performing the method of using the mounting device for the elastic retaining ring described in Example 7 based on the above structure, if, after step S41 is completed, one end of the retaining ring body 1 is pressed into groove 41 and the other end cannot automatically enter the groove due to its own repulsive force, step S42' is performed to rotate the push-down sleeve 3 inward in the circumferential direction of the end of the retaining ring body 1 that corresponds to the end that is pressed into groove 41, and at this time, the portion that has not entered groove 41 is pressed into groove 41 by the tripping protrusion 5, thereby ensuring that both ends of the retaining ring body 1 can enter groove 41. Therefore, in this example, steps S41 and S42' correspond to step S4 in Example 6.

[0058] Example 9 In the sixth embodiment, in order to achieve steps S1 and S2, the retaining ring body 1 can be previously pulled off using circlip pliers until it is equal to or larger than the shaft diameter of the shaft 4 to be attached, and in step 3, the entire retaining ring body 1 is fitted onto the journal at the front end of the corresponding groove 41 of the shaft 4 to be attached, and then the circlip pliers are removed, and the retaining ring body 1 is fitted onto the journal of the shaft 4 to be attached in an outwardly expanded and detached state. Finally, step S4 is carried out.

[0059] Although the technical principles of the present invention have been described above with reference to specific embodiments, these descriptions are intended to interpret the principles of the present invention and should not be construed as limiting the scope of protection of the present invention in any way. Based on the interpretation herein, a person skilled in the art may conceive of other specific embodiments of the present invention without any creative effort, and all of these embodiments are included in the scope of protection of the present invention. [Explanation of symbols]

[0060] 1-Retaining ring body 10-Opening 11-First end 111-First connection extension part 112-First position restriction protrusion 12-Second end 121-Second connection extension part 122-Second position control protrusion 13-Hook part 130-Locking lamination surface 14-Slope guideway 15-Removal hole 151-First removal hole 152 - second removal hole, 2-Guide bushings 21-tapered section, 3-Push down sleeve, 4-Mounting shaft 41-groove, 5-Trip protrusion 51-Transitional Lamination Surface

Claims

1. A mounting device for an elastic retaining ring for preventing slip-out, used to mount a retaining ring body (1) to a groove (41) of a shaft (4) to be mounted, wherein the ratio of the thickness of the retaining ring body (1) to the width of the groove (41) is 1:2 or more; The device includes a guide bush (2), a push-down sleeve (3), and a tripping protrusion (5), The guide bush (2) includes a tapered portion (21), the narrow end radial dimension of the tapered portion (21) being smaller than the locking diameter of the retaining ring body (1), and the wide end radial dimension of the tapered portion (21) being larger than the locking diameter of the retaining ring body (1), the guide bush (2) being coaxially coupled to the front end of a corresponding groove (41) of the shaft (4) to be attached, with the wide end of the tapered portion (21) facing the groove (41); The push-down sleeve (3) is fitted onto the outside of the guide bush (2) and is movable in the axial direction of the guide bush (2), The tripping protrusion (5) is located on the side of the push-down sleeve (3) that is closer to the mounting shaft (4), The push-down sleeve (3) can push the retaining ring body (1) fitted into the tapered portion (21) to move it toward the groove (41), causing the retaining ring body (1) to enter the groove (41), and in this process, the tripping protrusion (5) can push one end of the retaining ring body (1) on the opening side, causing both ends of the opening of the retaining ring body (1) to be shifted in the axial direction.

2. 2. The mounting device for a retaining elastic snap ring according to claim 1, wherein the tripping projection (5) is provided on an axial end surface of the snap ring body (1).

3. The tripping protrusion (5) is provided on the end surface of the push-down sleeve (3), A transitional bonding surface (51) is formed on one side of the tripping protrusion (5) so as to extend spirally in the circumferential and axial directions of the push-down sleeve (3); 2. The device for mounting an elastic retaining ring as claimed in claim 1, wherein the push-down sleeve (3) rotates in the circumferential direction of the shaft (4) to which the ring is mounted.

4. A method of using the mounting device for the elastic retaining ring according to claim 1, comprising: Step S11 is an axial unlocking step in which the retaining ring body (1) is placed over the tapered portion (21) from the narrow end of the tapered portion (21), the push-down sleeve (3) moves toward the retaining ring body (1), and the tripping protrusion (5) pushes one end of the retaining ring body (1) to move it and enter an axial unlocking state. Step S12: radially unlocking, in which the push-down sleeve (3) pushes the retaining ring body (1) toward the wide end of the tapered portion (21) until the retaining ring body (1) enters an outwardly expanded disengaged state; Step S2' is an expansion step in which the push-down sleeve (3) pushes the retaining ring body (1) toward the wide end of the tapered portion (21) to expand the retaining ring body (1) until its inner diameter becomes equal to or larger than the shaft diameter of the front end of the corresponding groove (41) of the shaft (4) to be attached; Step S3' is a movement in which the push-down sleeve (3) continues to push and move the retaining ring body (1) and moves the retaining ring body (1) in the axial direction until the front end of the retaining ring body (1) is axially outside the groove (41); Step S41: one end of the retaining ring enters the groove, and the push-down sleeve (3) pushes the retaining ring body (1) until the one end of the retaining ring body (1) pushed out by the tripping protrusion (5) enters the groove (41); and step S42, in which the entire retaining ring is inserted into the groove, and when one end of the retaining ring body (1) enters the groove, the other end follows the one end and simultaneously enters the groove due to the action of a repulsive force.

Images