Anti-disengagement elastic retaining ring capable of rebounding and self-locking and mounting method

Abstract

Provided are an anti-disengagement elastic retaining ring capable of rebounding and self-locking and a mounting method. The anti-disengagement elastic retaining ring comprises a retaining ring body (1); an opening (10) is formed in the retaining ring body (1); corresponding to two sides of the opening (10), two ends of the retaining ring body (1) are respectively a first end part (11) and a second end part (12); the first end part (11) and the second end part (12) are staggered with each other; corresponding to a position where the front ends of the first end part (11) and the second end part (12) are staggered with each other, the front ends of the first end part (11) and the second end part (12) are respectively provided with a first connection extension section (111) and a second connection extension section (121); a first limiting protruding part (112) and a second limiting protruding part (122) laterally extend from the first connection extension section (111) and the second connection extension section (121), respectively; the adjacent sides of the first limiting protruding part (112) and the second limiting protruding part (122) are provided with locking engagement surfaces (130); and the side of the first limiting protruding part (112) distant from the second limiting protruding part (122) and / or the side of the second limiting protruding part (122) distant from the first limiting protruding part (112) are provided with inclined guide surfaces (14). The anti-disengagement elastic retaining ring is applicable to a high-speed rotating shaft, is simple to mount, and is suitable for automatic mounting.

Description

Anti-drop elastic retaining ring capable of rebounding and self-locking and installation method Technical Field

[0001] The invention relates to the technical field of manufacturing an anti-slip elastic retaining ring, and in particular to an anti-slip elastic retaining ring capable of rebounding and self-locking and an installation method thereof. Background Art

[0002] Standard shaft circlips or open circlips are often used for axial positioning of bearings. In the electric drive axle structure of new energy electric vehicles, circlips are required for axial positioning. However, with the development of high-voltage platforms, the era of high speeds is also approaching. The maximum output speed of some motors has reached over 20,000 rpm, and the speed of the gear shaft connected to them has increased accordingly. At such high speeds, traditional open shaft circlips can easily be dislodged from the groove due to centrifugal force, posing a safety hazard. A shaft-preventing circlip is urgently needed to meet the requirements of future working conditions.

[0003] Existing elastic retaining rings with anti-slip functions, such as the one disclosed in patent document CN202022546754.0, are elastic retaining rings for shafts. The elastic retaining rings for shafts have a projection embedded in a recessed hole, allowing the upper and lower clamping blocks to engage with each other, thereby increasing the impact resistance of the retaining ring. The provision of reinforcing ribs makes the retaining ring body less susceptible to deformation when subjected to lateral force impact, preventing it from falling out of the shaft groove after deformation, further increasing stability. However, the following disadvantages still exist: on the one hand, the elastic retaining ring is in a disengaged state in its initial state, which causes the retaining ring to generate an outward elastic force when in the engaged state, resulting in poor overall stability. On the other hand, when installing the retaining ring into the shaft groove, an additional operation of closing the retaining ring is required. This increases the operating time of closing the retaining ring during large-scale assembly, and requires the design of an additional actuator, which increases the design difficulty and complexity of the automated assembly production line.

[0004] Summary of the Invention

[0005] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides an anti-drop elastic retaining ring capable of rebounding and self-locking, which is suitable for high-speed rotating shafts, is simple to install, and is suitable for automated installation.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] An anti-drop elastic retaining ring capable of rebounding and self-locking, comprising a retaining ring body, wherein an opening is provided on the retaining ring body, and two ends of the retaining ring body are respectively a first end and a second end corresponding to two sides of the opening;

[0008] When the retaining ring body is in the original state: the first end and the second end are staggered with each other, and corresponding to the position where the front ends of the first end and the second end are staggered with each other, the front ends of the first end and the second end are respectively provided with a first connecting extension section and a second connecting extension section; the first connecting extension section and the second connecting extension section are respectively provided with a first limiting protrusion and a second limiting protrusion laterally extending, and the first limiting protrusion and the second limiting protrusion are respectively on the inner side of each other in the circumferential direction of the retaining ring body; the first limiting protrusion and the second limiting protrusion are provided with a locking fitting surface on the side close to the first limiting protrusion; the first limiting protrusion is away from the second limiting protrusion and / or the second limiting protrusion is away from the first limiting protrusion. An inclined guide surface is provided;

[0009] When the retaining ring body expands outward from the locked state, the pair of locking contact surfaces can fit and interlock to prevent the retaining ring body from expanding outward to the disengaged state;

[0010] The retaining ring body can be reset from the outwardly expanded and disengaged state to the locked state by its own resilience through the inclined guide surface.

[0011] In the above structure, the first connecting extension section and the second connecting extension section are staggered with each other, that is, the first connecting extension section is on one side of the second connecting extension section, and the front end of the first connecting extension section extends between the end and the root of the second connecting extension section. It can also be understood that the first connecting extension section and the second connecting extension section are staggered with each other in the circumferential direction of the retaining ring body. When the first limiting protrusion and the second limiting protrusion are on the inner side of each other, the first limiting protrusion is on the side of the second limiting protrusion away from the outer end of the second connecting extension section; when the first limiting protrusion and the second limiting protrusion are on the outer side of each other, the first limiting protrusion is on the side of the second limiting protrusion close to the outer end of the second connecting extension section. The principle of the aforementioned anti-disengagement elastic retaining ring capable of rebounding and self-locking is as follows: when a pair of locking surfaces are facing each other, the first limiting protrusion and the second limiting protrusion are on the inner side of each other's corresponding retaining ring body in the circumferential direction, and the retaining ring body is in a locked state; when the pair of locking surfaces are facing away from each other, especially when the first limiting protrusion and the second limiting protrusion are on the outer side of each other's corresponding retaining ring body in the circumferential direction, the retaining ring body is in an outward expansion and disengagement state. Therefore, the retaining ring body is in an outward expansion and disengagement state in its original state. When the retaining ring body is installed in the shaft groove, the retaining ring body is in an inward expansion and disengagement state due to its own elastic force, which has the advantage of good stability. When installed on a high-speed rotating shaft, when the shaft speed reaches a certain value, the retaining ring body expands outward from the locked state. When the expansion reaches a certain level, the pair of locking surfaces can interlock, preventing the retaining ring body from expanding outward to a disengagement state. Therefore, the anti-slip elastic retaining ring capable of rebounding and self-locking described in the present application can be applied to high-speed rotating shafts, and the overall design is integrated, with a simple structure, low manufacturing cost and good reliability.

[0012] When the retaining ring body is in an external expansion and disengagement state due to an external force, the first limiting protrusion and the second limiting protrusion are on the outside of each other, and the inclined guide surface is between the first limiting protrusion and the second limiting protrusion; when the external force on the retaining ring body is reduced or eliminated, due to the rebound force of the retaining ring body itself, and because the first limiting protrusion and the second limiting protrusion are intertwined with each other, the first limiting protrusion and the second limiting protrusion will contact each other on the outside, and at this time, due to the action of the inclined guide surface, the first connecting extension section and the second connecting extension section will be stretched in a direction away from each other, so that the first limiting protrusion and the second limiting protrusion move to the inner side of the corresponding retaining ring body in the circumferential direction, and realize automatic reset to the locked state by relying on the rebound force. Relying on the above principle, the anti-slip elastic retaining ring capable of rebounding and self-locking described in the present application can save the actuator for the locking operation during automatic assembly, and can even save the operating rhythm of the locking operation, thereby improving assembly efficiency and being suitable for automated production.

[0013] Furthermore, in the aforementioned anti-dropout elastic retaining ring capable of rebounding and self-locking, the retaining ring body is in a sheet-like shape in its original state. As a preferred embodiment of the present application, the aforementioned anti-dropout elastic retaining ring capable of rebounding and self-locking can be directly processed from sheet material through a one-step forming machining process such as wire cutting or stamping, thereby having the advantages of low manufacturing cost and good economic efficiency.

[0014] Furthermore, in the aforementioned anti-drop elastic retaining ring capable of rebounding and self-locking, when the retaining ring body is in its original state: the second connecting extension section is located radially outward of the retaining ring body corresponding to the first connecting extension section. As a preferred embodiment of the present application, the first connecting extension section and the second connecting extension section are spaced apart in the radial direction, as opposed to being spaced apart in the axial direction. On the one hand, this facilitates processing and reduces manufacturing costs; on the other hand, the width of the groove corresponding to the installation of the retaining ring body is required to be small, that is, the axial movement space of the retaining ring body after installation is small.

[0015] Furthermore, the aforementioned anti-dropout elastic retaining ring capable of rebounding and self-locking further includes a disassembly hole, wherein the disassembly hole includes a first disassembly hole, and the first disassembly hole is provided on the second end portion. As a preferred embodiment of the present application, when the retaining ring body is installed in the groove, it is in a locked state. By applying force radially outwardly of the retaining ring body through the first disassembly hole using a tool, the second connecting extension section can be opened until the retaining ring body is in an outwardly expanded and disengaged state, thereby enabling the retaining ring body installed in the groove to be removed.

[0016] Furthermore, in the aforementioned anti-dropout elastic retaining ring capable of rebounding and self-locking, the disassembly hole includes a second disassembly hole, and the second disassembly hole is provided on the first end. As a preferred embodiment of the present application, the disassembly holes are provided in pairs at both ends of the retaining ring body, so that circlip pliers can be used to reach into the pair of disassembly holes to remove the retaining ring body installed in the groove.

[0017] Furthermore, in the aforementioned anti-dropout elastic retaining ring capable of rebounding and self-locking, the front ends of the first and second limiting protrusions extend inwardly in the circumferential direction of the corresponding retaining ring body, forming a pair of hooks that can interlock with each other, and the locking contact surface is provided on the inner sides of the hooks. As a preferred embodiment of the present application, the use of an interlocking hook structure has the advantage of a reliable locking effect.

[0018] Furthermore, in the aforementioned anti-slip elastic retaining ring capable of rebounding and self-locking, when the retaining ring body is in its original state, the first limiting protrusion and the second limiting protrusion are spaced apart by a preset distance. As a preferred solution of the present application, based on the above structure, the inner diameter of the retaining ring body in its original state can be smaller than the corresponding groove diameter. When the retaining ring body is sleeved on the groove, the spacing between the first limiting protrusion and the second limiting protrusion is reduced relative to the preset distance. Therefore, the retaining ring body can generate a certain tightening force to prevent the retaining ring body from shaking when installed in the groove.

[0019] Furthermore, in the aforementioned anti-dropout elastic retaining ring capable of rebounding and self-locking, the first limiting protrusion and the second limiting protrusion are staggered with a preset distance in the axial direction, and at this time, the retaining ring body is in an axially unlocked state;

[0020] The retaining ring body can be reset from an axially unlocked state to a locked state by its own resilience. As a preferred embodiment of this application, when the retaining ring body is in the axially unlocked state, the pair of locking surfaces do not contact each other during outward expansion, allowing the retaining ring body to continue expanding until it reaches an outwardly disengaged state. Achieving this functionality depends on the material properties and structural parameters of the retaining ring body.

[0021] Furthermore, the anti-slip elastic retaining ring capable of rebounding and self-locking is provided with a release protrusion on the end surface of the first end or the second end. As a preferred embodiment of the present application, when a flat tool is used to press down the end surface of the retaining ring body corresponding to the release protrusion, the first end or the second end on one side will be axially pushed by the release protrusion, causing the pair of locking fitting surfaces on the first limiting protrusion and the second limiting protrusion to be staggered in the axial direction of the retaining ring body. At this time, the retaining ring body enters an axially unlocked state. After entering the axially unlocked state, when the retaining ring body expands outward, the pair of locking fitting surfaces will not contact each other, so the retaining ring body can continue to expand outward. Based on the above principle, the existing elastic retaining ring tooling can be used to automatically install the retaining ring body into the groove of the shaft to be installed. After installation is completed, the release protrusion can be removed. For specific existing elastic retaining ring tooling, reference can be made to the elastic retaining ring installation tooling disclosed in application number 201720993374.7.

[0022] The method for installing the anti-drop elastic retaining ring capable of rebounding and self-locking is characterized by comprising the following steps:

[0023] Step S1: unlocking, changing the retaining ring body from the original state to the outward expansion and disengagement state;

[0024] Step S2: expanding the retaining ring body until its inner diameter is greater than or equal to the diameter of the shaft to be installed;

[0025] Step S3: moving the retaining ring body axially to the axial outside of the groove;

[0026] Step S4: Entering the groove, axially moving the retaining ring body into the groove, at which time the retaining ring body is reset from the external expansion and disengagement state to the locked state due to its own resilience, and is clamped in the groove. As a preferred embodiment of the present application, according to the above method, the anti-slip elastic retaining ring capable of rebounding and self-locking described in the present application can eliminate the actuator for the locking operation during automated assembly, and can even eliminate the operating rhythm of the locking operation, thereby improving assembly efficiency and being suitable for automated production.

[0027] It can be seen from the above technical solution that the present invention has the following beneficial effects:

[0028] 1. The present invention provides an anti-slip elastic retaining ring capable of rebounding and self-locking. The retaining ring body is in a locked state in its original state. When the retaining ring body is installed in the shaft groove, the retaining ring body is in a locked state, so its own elastic force will not cause the retaining ring body to disengage, and it has the advantage of good stability. When installed on a high-speed rotating shaft, after the shaft speed reaches a certain value, the retaining ring body bulges outward from the locked state. When it bulges outward to a certain extent, a pair of locking fitting surfaces can fit and interlock, preventing the retaining ring body from bulging outward to a disengaged state. Therefore, the anti-slip elastic retaining ring capable of rebounding and self-locking described in this application can be applied to high-speed rotating shafts, and the overall design is one-piece, with a simple structure, low manufacturing cost, and good reliability.

[0029] 2. The present invention provides an anti-slip elastic retaining ring that can rebound and self-lock. During automated assembly, the actuator for the locking operation can be omitted, and even the operating rhythm of the locking operation can be omitted, thereby improving assembly efficiency and being suitable for automated production.

[0030] 3. The present invention provides a self-locking anti-dropout elastic retaining ring capable of rebounding, wherein the retaining ring body is in a sheet-like shape in its original state. The self-locking anti-dropout elastic retaining ring of the present application can be directly manufactured from sheet material through a one-step forming machining process such as wire cutting or stamping, and has the advantages of low manufacturing cost and good economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic structural diagram of an anti-drop elastic retaining ring capable of rebounding and self-locking in an original state according to an embodiment of the present application;

[0032] FIG2 is a partial enlarged view of the opening corresponding to FIG1;

[0033] FIG3 is a schematic diagram of the anti-drop elastic retaining ring capable of rebounding and self-locking when the locking surfaces thereof are in contact with each other in a locked state;

[0034] FIG4 is a schematic diagram of the anti-dropout elastic retaining ring capable of rebounding and self-locking in an outwardly expanded and disengaged state;

[0035] FIG5 is a schematic diagram showing that the inclined guide surface is an inclined plane;

[0036] FIG6 is a schematic structural diagram of an anti-drop elastic retaining ring installation device according to an embodiment of the present application (the release protrusion is on the retaining ring body);

[0037] FIG7 is a schematic structural diagram of an anti-drop elastic retaining ring installation device according to an embodiment of the present application (the release protrusion is on the pressing sleeve);

[0038] FIG8 is a schematic structural diagram of a pressing sleeve in an anti-drop elastic retaining ring installation device according to an embodiment of the present application;

[0039] FIG9 is a schematic structural diagram of an anti-drop elastic retaining ring installation device according to an embodiment of the present application;

[0040] FIG10 is a schematic diagram of step S11 in a method for using an anti-dropping elastic retaining ring installation device according to an embodiment of the present application;

[0041] FIG11 is a schematic diagram of step S12 in a method for using an anti-dropping elastic retaining ring installation device according to an embodiment of the present application;

[0042] FIG12 is a schematic diagram of step S41 in a method for using an anti-dropping elastic retaining ring installation device according to an embodiment of the present application;

[0043] FIG13 is a schematic diagram of the retaining ring body completely entering the groove;

[0044] FIG14 is a cross-sectional view of FIG13 .

[0045] In the figure: 1 - retaining ring body; 10 - opening; 11 - first end; 111 - first connecting extension; 112 - first limiting protrusion; 12 - second end; 121 - second connecting extension; 122 - second limiting protrusion; 13 - hook; 130 - locking contact surface; 14 - inclined guide surface; 15 - disassembly hole; 151 - first disassembly hole; 152 - second disassembly hole;

[0046] 2-introducer sleeve; 21-conical segment;

[0047] 3-Press down the sleeve;

[0048] 4-shaft to be installed; 41-groove;

[0049] 5-unbuttoning protrusion; 51-transition fitting surface. DETAILED DESCRIPTION

[0050] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying 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 should not be understood as limiting the present invention.

[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise explicitly specified.

[0053] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0054] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0055] Example 1

[0056] As shown in Figures 1 and 2, an anti-drop elastic retaining ring capable of rebounding and self-locking comprises a retaining ring body 1, wherein an opening 10 is provided on the retaining ring body 1, and corresponding to both sides of the opening 10, the two ends of the retaining ring body 1 are respectively a first end 11 and a second end 12;

[0057] When the retaining ring body 1 is in the original state: the first end portion 11 and the second end portion 12 are staggered with each other, and corresponding to the position where the front ends of the first end portion 11 and the second end portion 12 are staggered with each other, the front ends of the first end portion 11 and the second end portion 12 are respectively provided with a first connecting extension section 111 and a second connecting extension section 121; the first connecting extension section 111 and the second connecting extension section 121 are respectively extended laterally with a first limiting protrusion 112 and a second limiting protrusion 122, and the first limiting protrusion 112 and the second limiting protrusion 122 are on the inner side of each other in the circumferential direction of the retaining ring body 1; the first limiting protrusion 112 and the second limiting protrusion 122 are provided with a locking fitting surface 130 on the side close to the first limiting protrusion 112; the first limiting protrusion 112 is provided with an inclined guide surface 14 on the side away from the second limiting protrusion 122 and / or the second limiting protrusion 122 is provided with a side away from the first limiting protrusion 112; in this embodiment, the first limiting protrusion 112 and the second limiting protrusion 122 are respectively provided with an inclined guide surface 14. The first limiting protrusion 112 and the second limiting protrusion 122 are respectively disposed at the front ends of the first connecting extension section 111 and the second connecting extension section 121 .

[0058] When the retaining ring body 1 expands outward from the locked state, the pair of locking contact surfaces 130 can fit and interlock to prevent the retaining ring body 1 from expanding outward to the disengaged state;

[0059] The retaining ring body 1 can be reset from the outwardly expanded and disengaged state to the locked state by its own resilience through the inclined guide surface 14 .

[0060] In the above structure, as shown in FIG2 , the first connecting extension section 111 and the second connecting extension section 121 are staggered with each other, that is, the first connecting extension section 111 is on one side of the second connecting extension section 121, and the front end of the first connecting extension section 111 extends between the end and the root of the second connecting extension section 121. It can also be understood that the first connecting extension section 111 and the second connecting extension section 121 are staggered with each other in the circumferential direction of the retaining ring body 1. The first limiting protrusion 112 and the second limiting protrusion 122 are on the inner side of each other in the circumferential direction of the retaining ring body 1, that is, the first limiting protrusion 112 is on the side of the second limiting protrusion 122 away from the outer end of the second connecting extension section 121; when the first limiting protrusion 112 and the second limiting protrusion 122 are on the outer side of each other in the circumferential direction of the retaining ring body 1, that is, the first limiting protrusion 112 is on the side of the second limiting protrusion 122 close to the outer end of the second connecting extension section 121. In this embodiment, the first and second limiting protrusions 112, 122 are disposed on adjacent sides of the first and second connecting extensions 111, 121, and extend in opposite directions. The first and second limiting protrusions 112, 122 intersect in the extension direction. Specifically, the inclined guide surface 14 is disposed on the outside of the front end of the limiting protrusion in the extension direction. In this embodiment, the inclined guide surface 14 is a curved surface with rounded corners.

[0061] The principle of the anti-slip elastic retaining ring capable of rebounding and self-locking is as follows: as shown in Figures 2 and 3, when a pair of locking fitting surfaces 130 are opposite to each other, the first limiting protrusion 112 and the second limiting protrusion 122 are on the inner side of the corresponding retaining ring body 1 in the circumferential direction of each other, and the retaining ring body 1 is in a locked state; as shown in Figure 4, when a pair of locking fitting surfaces 130 are opposite to each other, in particular, when the first limiting protrusion 112 and the second limiting protrusion 122 are on the outer side of the corresponding retaining ring body 1 in the circumferential direction of each other, the retaining ring body 1 is in an outward expansion and disengagement state. Therefore, the retaining ring body 1 is in a locked state in its original state. When the retaining ring body 1 is installed in the shaft groove, the retaining ring body 1 is in a locked state, so its own elastic force will not cause the retaining ring body 1 to disengage, and it has the advantage of good stability. When mounted on a high-speed rotating shaft, the shaft speed reaches a certain value, and the retaining ring body 1 expands outward from the locked state. When the expansion reaches a certain degree, the pair of locking contact surfaces 130 can interlock with each other, preventing the retaining ring body 1 from expanding outward to the disengaged state. Therefore, the anti-drop elastic retaining ring capable of rebounding and self-locking described in this application can be applied to high-speed rotating shafts, and the overall design is simple in structure, low in manufacturing cost, and high in reliability. When the retaining ring body 1 is in an external expansion and disengagement state by external force, the first limiting protrusion 112 and the second limiting protrusion 122 are on the outside of each other, and the inclined guide surface 14 is between the first limiting protrusion 112 and the second limiting protrusion 122; when the external force applied to the retaining ring body 1 is reduced or eliminated, due to the rebound force of the retaining ring body 1 itself, and because the first limiting protrusion 112 and the second limiting protrusion 122 are staggered with each other, the first limiting protrusion 112 and the second limiting protrusion 122 will contact each other on the outside. At this time, due to the action of the inclined guide surface 14, the first connecting extension section 111 and the second connecting extension section 121 will be stretched in a direction away from each other, so that the first limiting protrusion 112 and the second limiting protrusion 122 move to the inner side of the corresponding retaining ring body 1 in the circumferential direction, and automatically reset to the locked state by relying on the rebound force. Relying on the above principle, the anti-slip elastic retaining ring capable of rebounding and self-locking described in this application can eliminate the actuator for locking operation during automated assembly, and even eliminate the operating rhythm of the locking operation, thereby improving assembly efficiency and being suitable for automated production.

[0062] In the present embodiment, the retaining ring body 1 is in the form of a sheet as a whole in its original state. Therefore, the anti-slip elastic retaining ring capable of rebounding and self-locking of the present application can be directly processed and formed from sheet materials through a one-time forming machining process such as wire cutting or stamping, and has the advantages of low manufacturing cost and good economy. Specifically, in the present embodiment, the retaining ring body 1 is in the shape of a ring cone as a whole, and the two axial end faces of the retaining ring body 1 are planes. Spring steel sheets can be used for one-time processing and forming by stamping or wire cutting. The above structure is different from an elastic retaining ring for an electric vehicle reducer shaft disclosed in the Chinese patent document with application number 202121468092.8, which is spiral in its original state, which leads to high complexity and high cost in the processing and manufacturing process of the elastic retaining ring.

[0063] 1 and 2 , in this embodiment, when the retaining ring body 1 is in the original state, the second connecting extension section 121 is located outside the first connecting extension section 111 in the radial direction of the retaining ring body 1 .

[0064] The first connecting extension section 111 and the second connecting extension section 121 are spaced apart in the radial direction and spaced apart in the axial direction. On the one hand, this facilitates processing and reduces manufacturing costs; on the other hand, the width requirement of the groove for installing the retaining ring body 1 is small, that is, the axial movement space of the retaining ring body 1 is small after installation.

[0065] As shown in Figure 1, this embodiment further includes a disassembly hole 15, which includes a first disassembly hole 151, and the first disassembly hole 151 is arranged on the second end 12. When the retaining ring body 1 is installed in the groove, it is in a locked state. By using a tool to pass through the first disassembly hole 151 and apply force to the radially outer side of the retaining ring body 1, the second connecting extension section 121 can be opened until the retaining ring body 1 is in an outward expansion and disengagement state, thereby achieving the removal of the retaining ring body 1 installed in the groove. In this embodiment, the disassembly hole 15 also includes a second disassembly hole 152, and the second disassembly hole 152 is arranged on the first end 11. The disassembly holes 15 are arranged in pairs at both ends of the retaining ring body 1, making it convenient to use circlip pliers to reach into a pair of disassembly holes 15 to remove the retaining ring body 1 installed in the groove. In this application, the first disassembly hole 151 and the second disassembly hole 152 are respectively arranged at the roots of the second connecting extension section 121 and the first connecting extension section 111 corresponding to the second end 12 and the first end 11.

[0066] As shown in FIG2 , in this embodiment, the front ends of the first and second position-limiting protrusions 112 and 122 extend inwardly of the corresponding retaining ring body 1 in the circumferential direction, forming a pair of hooks 13 that can interlock with each other, and the locking contact surface 130 is disposed on the inner side of the hooks 13. The use of an interlocking hook structure has the advantage of a secure locking effect. It should be noted that the structure capable of achieving interlocking is not limited to the hooks 13 described in this embodiment, and may also be a position-limiting structure such as a mutually cooperating toothed portion, a male-female cooperating protrusion and recess, or the like.

[0067] As shown in FIG2 , in this embodiment, when the retaining ring body 1 is in its original state, a preset distance a is spaced between the first position-limiting protrusion 112 and the second position-limiting protrusion 122. Based on the above structure, the inner diameter of the retaining ring body 1 in its original state can be smaller than the corresponding groove diameter. When the retaining ring body 1 is sleeved on the groove, the spacing between the first position-limiting protrusion 112 and the second position-limiting protrusion 122 is reduced relative to the preset distance. Therefore, the retaining ring body 1 can generate a certain tightening force to prevent the retaining ring body 1 from shaking when installed in the groove.

[0068] As shown in Figure 10, in this embodiment, the first limiting protrusion 112 and the second limiting protrusion 122 are staggered from each other by a preset distance in the axial direction. At this time, the retaining ring body 1 is in an axially unlocked state; the retaining ring body 1 can rely on its own rebound force to reset from the axially unlocked state to the locked state.

[0069] As shown in Figures 10 to 13, when the retaining ring body 1 is in the axial unlocked state, when the retaining ring body 1 expands outward, the pair of locking fitting surfaces 130 will not contact each other. Therefore, the retaining ring body 1 can continue to expand outward until it is in the expanded disengaged state. The realization of the above functions 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 open clamping ring in the standard GB / T 894-2017. The corresponding installation groove dimensions are consistent with this standard. On the one hand, it can achieve the above functions, and on the other hand, it has the advantage of a wide range of applications, and the dimensional parameters can be adaptively modified for special applications.

[0070] Specifically, the retaining ring body 1 has an inner diameter of 45.8 mm, an outer diameter of 56 mm, and a thickness of 2 mm, and is made of 60Si2Mn. When the second connecting extension 121 is pressed downward to an axial displacement of greater than 2 mm from the second limiting protrusion 122, the retaining ring body 1 is in an axially unlocked state. When the force pressing down on the second connecting extension 121 is removed without applying a radially expanding force, the retaining ring body 1 can return from the axially unlocked state to the locked state by its own resilience.

[0071] Example 2

[0072] As shown in FIG. 5 , the difference from Example 1 is that the inclined guide surface 14 in this embodiment is an inclined plane in a chamfered shape.

[0073] Example 3

[0074] In conjunction with an anti-slip elastic retaining ring installation device shown in Figure 6, it includes: a guide sleeve 2 and a shaft 4 to be installed with a groove 41, the shaft 4 to be installed is fixed by a fixing assembly (not shown); the guide sleeve 2 includes a tapered section 21, the narrow end radial dimension of the tapered section 21 is smaller than the locking diameter of the retaining ring body 1, and the wide end radial dimension of the tapered section 21 is larger than the locking diameter of the retaining ring body 1, the guide sleeve 2 is coaxially coupled to the front end of the shaft 4 to be installed corresponding to the groove 41, and the wide end of the tapered section 21 faces the groove 41;

[0075] The pressing sleeve 3 is sleeved on the outside of the guide sleeve 2 and can move axially along the guide sleeve 2. The pressing sleeve 3 is provided with a release protrusion 5 on the side of the shaft 4 to be installed. When used in an automated assembly production line, the pressing sleeve 3 is connected to a linear drive device (not shown), and the linear drive device drives the pressing sleeve 3 to achieve axial movement.

[0076] The pressing sleeve 3 can push the retaining ring body 1 clamped on the conical section 21 to move toward the groove 41. During this process, the unfastening protrusion 5 can push one end of the opening 10 side of the retaining ring body 1, so that the locking fitting surfaces 130 on both sides of the retaining ring body 1 are axially offset until the retaining ring body 1 enters an axially unlocked state.

[0077] It should be noted that: as shown in Figure 3, when the retaining ring body 1 expands outward from the locked state until the pair of locking fitting surfaces 130 fit together and interlock, the aperture at this time is the locking caliber, that is, the locking caliber is the largest aperture of the retaining ring body 1 in the locked state. When the retaining ring body 1 is in the axially unlocked state, when the retaining ring body 1 expands outward, the pair of locking fitting surfaces 130 will not contact each other. Therefore, in this state, the retaining ring body 1 can continue to expand outward until it is disengaged from the expanded state. In addition, the present application defines the case where the guide sleeve 2 includes a tapered section 21, and therefore does not rule out the following possibility: an extension section with a radial dimension range greater than the locking caliber and smaller than the radial dimension of the wide end of the tapered section 21 is provided between the wide end of the tapered section 21 and the groove 41 on the guide sleeve 2.

[0078] In this embodiment, the outer edge of the cross section of the tapered section 21 is circular. The axial dimension of the retaining ring body 1 is greater than the thickness of the retaining ring body 1.

[0079] As shown in Figure 6 , in this embodiment, the release protrusion 5 is disposed on the axial end surface of the retaining ring body 1. Specifically, the release protrusion 5 is provided on the end surface of the first end portion 11 or the second end portion 12. This structure eliminates the need for circumferential positioning of the pressing sleeve 3 when the release protrusion 5 is pressed into engagement, thus simplifying control.

[0080] In this embodiment, the release protrusion 5 is a pin, which is detachably installed in one of the disassembly holes 15.

[0081] Example 4

[0082] 7 , different from Embodiment 3, in this embodiment, the unfastening protrusion 5 is provided on the end surface of the pressing sleeve 3 .

[0083] In combination with Example 3, there are two situations in which the unfastening protrusion 5 is provided on the retaining ring body 1: the first is like Example 4, in which the unfastening protrusion 5 is installed separately on the retaining ring body 1. In this case, after the retaining ring body 1 is pressed into the groove 41, an extra operation step is required to remove the unfastening protrusion 5, which affects the assembly efficiency; the second is that the unfastening protrusion 5 is extended and provided on the retaining ring body 1, which increases the complexity of the manufacturing process of the retaining ring body 1, resulting in high manufacturing cost of the retaining ring body 1, and also affects the compactness of the axial installation of the retaining ring body 1.

[0084] In this embodiment, the unfastening protrusion 5 is arranged on the pressing sleeve 3, which can overcome the above-mentioned disadvantages of arranging the unfastening protrusion 5 on the retaining ring body 1. It should be noted that: in order to achieve automatic assembly, the unfastening protrusion 5 must be aligned with one end of the retaining ring body 1 on the side corresponding to the opening 10, and both ends cannot be pressed down at the same time, otherwise it will cause assembly failure; in order to ensure the realization of this circumferential positioning, an automatic manipulator can be used to feed the material. Specifically, the manipulator can be used to separate and remove the retaining ring body 1 that has been pre-positioned (to achieve pre-positioning, a batch of retaining ring bodies 1 can be placed in a circumferentially positioned material tray in the raw material tray), and the retaining ring body 1 is placed on the conical section 21 at a preset circumferential angle according to a set program, and then the pressing sleeve 3 is started to move, thereby ensuring the realization of the above-mentioned function.

[0085] Example 5

[0086] 8 to 14 , based on Example 4, in this embodiment, one side of the release protrusion 5 spirally extends along the circumferential and axial directions of the pressing sleeve 3 to form a transition fitting surface 51 .

[0087] When the release protrusion 5 pushes up one end of the retaining ring body 1 on the side of the opening 10, the retaining ring body 1 is entirely fitted on the transition fitting surface 51, which can improve the stability of the retaining ring body 1 when being pushed by the pressing sleeve 3. In this embodiment, the release protrusion 5 and the pressing sleeve 3 are integrally formed, the release protrusion 5 is stepped, and the transition fitting surface 51 extends spirally from the front end of the release protrusion 5 to the base of the release protrusion 5.

[0088] Example 6

[0089] The method for installing a self-locking anti-drop elastic retaining ring capable of rebounding described in Examples 1 and 2 of the present application comprises the following steps:

[0090] Step S1: unlocking, changing the retaining ring body 1 from the original state to the outward expansion and disengagement state;

[0091] Step S2: expanding the retaining ring body 1 until its inner diameter is greater than or equal to the diameter of the shaft 4 to be installed;

[0092] Step S3: Move, and move the retaining ring body 1 axially to the axial outside of the groove 41; specifically, in this step, the retaining ring body 1 can be axially moved to the shaft neck corresponding to the front side of the groove 41 of the shaft 4 to be installed. At this time, the external support force applied to the retaining ring body 1 is removed, and the retaining ring body 1 is in an externally expanded and disengaged state and is clamped on the shaft neck of the shaft 4 to be installed.

[0093] Step S4: Entering the groove, axially moving the retaining ring body 1 into the groove 41 , at this time the retaining ring body 1 is reset from the external expansion and disengagement state to the locking state due to its own resilience, and is clamped in the groove 41 .

[0094] According to the above method, the anti-slip elastic retaining ring capable of rebounding and self-locking described in this application can eliminate the actuator for performing the locking operation during automated assembly, and can even eliminate the operating rhythm of the locking operation, thereby improving assembly efficiency and being suitable for automated production.

[0095] Example 7

[0096] The method for using the anti-slip elastic retaining ring installation device described in Examples 3 to 5 for installing the anti-slip elastic retaining ring capable of rebounding and self-locking described in Examples 1 and 2, as shown in Figures 9 to 14 (taking Example 5 as an example), includes the following steps:

[0097] Step S11: Axially unlocking, inserting the retaining ring body 1 into the tapered section 21 from the narrow end thereof, moving the pressing sleeve 3 toward the retaining ring body 1, and pushing one end of the retaining ring body 1 to move via the unlocking protrusion 5, thereby entering an axially unlocked state;

[0098] Step S12: radially unlocking, the pressing sleeve 3 pushes the retaining ring body 1 toward the wide end of the tapered section 21 until the retaining ring body 1 enters an external expansion and disengagement state; wherein, steps S11 and S12 correspond to step S1 in embodiment 6.

[0099] Step S2': Expansion: The pressing sleeve 3 pushes the retaining ring body 1 toward the wide end of the tapered section 21; the retaining ring body 1 is expanded until its inner diameter is greater than or equal to the diameter of the front end of the groove 41 corresponding to the shaft 4 to be installed. It should be noted that the diameter of the shaft neck at 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 Example 6.

[0100] Step S3': Movement: The pressing sleeve 3 continues to push the retaining ring body 1, axially moving the retaining ring body 1 until the front end of the retaining ring body 1 is axially outside the groove 41. Specifically, when the rear end of the guide sleeve 2 is positioned in contact with the outer edge of the groove 41, the retaining ring body 1 is entirely positioned on the guide sleeve 2. In this embodiment, the rear end of the guide sleeve 2 is axially in contact with the shaft neck at the front end of the groove 41. Therefore, in this step, the retaining ring body 1 is axially moved to the shaft neck in front of the groove 41. In this embodiment, step S3' corresponds to step S3 in Example 6.

[0101] Step S41: One end enters the groove, and the pressing sleeve 3 continues to push the retaining ring body 1 to move until the end of the retaining ring body 1 pushed out by the unlocking protrusion 5 enters the groove 41;

[0102] Step S42: The entire retaining ring body 1 is slotted. After one end of the retaining ring body 1 is slotted, the other end will follow the previous end and slot simultaneously due to the rebound force. Steps S41 and S42 correspond to step S4 in Example 6. It should be noted that the other end automatically slots due to the combined action of the axial and circumferential elastic forces of the retaining ring body 1. The prerequisite for achieving this effect is also related to the depth of the groove 41 and the dimensional parameters of the journal at the outer end of the groove 41. In this embodiment, the retaining ring body 1 is made of spring steel, and its overall dimensional parameters and the dimensional parameters of the groove 41 and the journal follow the provisions of the standard GB / T 894-2017 for open collars. After sample testing, the effects described in steps S41 and S42 can be achieved. In the experiment, 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 a material of 60Si2Mn. The inner diameter of the groove 41 is 47 mm. Furthermore, the use of a standard clamping ring to perform the above method test can also achieve the effect of the other end following into the groove as described in step S42.

[0103] Example 8

[0104] On the basis of embodiment 4 or 5, in this embodiment, the pressing sleeve 3 can rotate circumferentially along the shaft 4 to be installed.

[0105] Based on the above structure, when executing the method for using the anti-slip elastic retaining ring installation device described in Example 7, if after step S41 is completed, after one end of the retaining ring body 1 is pressed into the groove 41, the other end cannot automatically enter the groove by relying on its own rebound force, then step S42' is performed: the pressing sleeve 3 is rotated along the circumferential inner side of the end of the retaining ring body 1 corresponding to the end pressed into the groove 41. At this time, the unfastening protrusion 5 will press the portion that has not entered the groove 41 into the groove 41, thereby ensuring that both ends of the retaining ring body 1 enter the groove 41. Therefore, in this embodiment, steps S41 and S42' correspond to step S4 in Example 6.

[0106] Example 9

[0107] In Example 6, steps S1 and S2 can be implemented by using circlip pliers. The retaining ring body 1 is first pre-unfastened to a diameter greater than or equal to the diameter of the shaft 4 to be installed. In step 3, the retaining ring body 1 is entirely sleeved onto the journal at the front end of the groove 41 of the shaft 4 to be installed. The circlip pliers are then removed. The retaining ring body 1 is in an expanded and disengaged state and is clamped onto the journal of the shaft 4 to be installed. Finally, step S4 is executed.

[0108] The technical principles of the present invention have been described above in conjunction with specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and are not to be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will be able to conceive of other specific embodiments of the present invention without inventive effort, and such embodiments will fall within the scope of protection of the present invention.

Claims

1. An anti-drop elastic retaining ring capable of rebounding and self-locking, comprising a retaining ring body (1), wherein an opening (10) is provided on the retaining ring body (1), and corresponding to the two sides of the opening (10), the two ends of the retaining ring body (1) are respectively a first end (11) and a second end (12); characterized in that: When the retaining ring body (1) is in an original state: the first end (11) and the second end (12) are staggered with each other; corresponding to the position where the front ends of the first end (11) and the second end (12) are staggered with each other, the front ends of the first end (11) and the second end (12) are respectively provided with a first connecting extension section (111) and a second connecting extension section (121); the first connecting extension section (111) and the second connecting extension section (121) are respectively provided with a first limiting protrusion (112) and a second limiting protrusion (113) extending laterally therefrom; A second limiting protrusion (122), wherein the first limiting protrusion (112) and the second limiting protrusion (122) are located on the inner side of each other in the circumferential direction of the corresponding retaining ring body (1); a locking fitting surface (130) is provided on the side close to the first limiting protrusion (112) and the second limiting protrusion (122); an inclined guide surface (14) is provided on the side of the first limiting protrusion (112) away from the second limiting protrusion (122) and / or on the side of the second limiting protrusion (122) away from the first limiting protrusion (112); When the retaining ring body (1) expands outward from the locked state, the pair of locking abutment surfaces (130) can abut and interlock, thereby preventing the retaining ring body (1) from expanding outward to a disengaged state; The retaining ring body (1) can be reset from an outwardly expanded and disengaged state to a locked state by its own resilience through the inclined guide surface (14).

2. The anti-drop elastic retaining ring capable of rebounding and self-locking according to claim 1, characterized in that: The retaining ring body (1) is in a sheet shape as a whole in its original state.

3. The anti-drop elastic retaining ring capable of rebounding and self-locking according to claim 2 is characterized in that: When the retaining ring body (1) is in an original state: the second connecting extension section (121) is located outside the first connecting extension section (111) in a radial direction corresponding to the retaining ring body (1).

4. The anti-drop elastic retaining ring capable of rebounding and self-locking according to claim 3 is characterized in that: It also includes a disassembly hole (15), wherein the disassembly hole (15) includes a first disassembly hole (151), and the first disassembly hole (151) is arranged on the second end (12).

5. The anti-drop elastic retaining ring capable of rebounding and self-locking according to claim 4, characterized in that: The disassembly hole (15) comprises a second disassembly hole (152), and the second disassembly hole (152) is arranged on the first end portion (11).

6. The anti-drop elastic retaining ring capable of rebounding and self-locking according to claim 1, characterized in that: The front ends of the first limiting protrusion (112) and the second limiting protrusion (122) extend inwardly in the circumferential direction of the corresponding retaining ring body (1) to form a pair of hooks (13) that can be locked with each other, and the locking fitting surface (130) is arranged on the inner side of the hook (13).

7. The anti-drop elastic retaining ring capable of rebounding and self-locking according to claim 1, characterized in that: When the retaining ring body (1) is in an original state, a preset distance is provided between the first limiting protrusion (112) and the second limiting protrusion (122).

8. An anti-drop elastic retaining ring capable of rebounding and self-locking according to any one of claims 1 to 7, characterized in that: The first limiting protrusion (112) and the second limiting protrusion (122) are staggered from each other by a preset distance in the axial direction, and the retaining ring body (1) is in an axially unlocked state; The retaining ring body (1) can be reset from an axially unlocked state to a locked state by its own resilience.

9. The anti-drop elastic retaining ring capable of rebounding and self-locking according to claim 8, characterized in that: A release protrusion (5) is provided on the end surface of the first end (11) or the second end (12).

10. A method for installing a spring-rebound self-locking anti-drop elastic retaining ring according to any one of claims 1 to 9, characterized in that: The steps include: Step S1: unlocking, changing the retaining ring body (1) from an original state to an outwardly expanded and disengaged state; Step S2: expanding the retaining ring body (1) until its inner diameter is greater than or equal to the diameter of the shaft (4) to be installed; Step S3: moving the retaining ring body (1) axially to the axial outer side of the groove (41); Step S4: Entering the groove, axially moving the retaining ring body (1) into the groove (41), at which time the retaining ring body (1) is reset from the external expansion disengagement state to the locking state due to its own resilience and is clamped in the groove (41).

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