Rotating assembly and one-way transmission mechanism

Abstract

The utility model relates to the technical field of injection devices, in particular to a rotating assembly and a one-way transmission mechanism, the rotating assembly comprises a shell and a rotating part, the rotating part rotatably penetrates through the shell, a convex ring is arranged on the inner wall of the shell, a limiting ring is arranged on the outer side of the rotating part, and the rotating assembly further comprises a low-friction part; the low-friction part is arranged between the convex ring and the limiting ring; when the rotating part rotates relative to the shell, the low-friction part abuts against the convex ring and rotates relative to the convex ring, and the dynamic friction coefficient of the low-friction part and the convex ring is configured to be smaller than that between the convex ring and the limiting ring; and / or, when the rotating component rotates relative to the shell, the low-friction component abuts against the limiting ring and rotates relative to the limiting ring, and the dynamic friction coefficient of the low-friction component and the limiting ring is configured to be smaller than that between the convex ring and the limiting ring. Friction force generated in the process that the rotating component rotates relative to the shell can be reduced, and then injection resistance of a user is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection devices, in particular to a rotating assembly and a one-way transmission mechanism. BACKGROUND

[0002] When injecting a medicament, a specific injection device is used by a user to set a dose based on a requirement and inject the set dose. The dose set by the user using the injection device is converted into displacement or deformation of a component, and when a bolus action is performed, the component that has been displaced or deformed moves back to the initial position or state, so as to drive a rotating component to rotate relative to a housing of the injection device in a bolus rotation direction, and the rotating rotating component drives a push rod to feed distally to push a piston of a cartridge, thereby achieving injection of the medicament.

[0003] In the related art, a rotating component is rotatably installed in a housing, and a limiting ring is arranged on an outer periphery of the rotating component, and a convex ring is correspondingly arranged in the housing, so as to limit the axial position of the rotating component relative to the housing by the limiting ring and the convex ring. In addition, in some injection devices, an elastic component is arranged on a side of the limiting ring away from the convex ring in the housing, and the elastic force of the elastic component causes the limiting ring of the rotating component to abut against the convex ring in the housing. During the bolus process, the abutting and relative rotation of the limiting ring of the rotating component and the convex ring in the housing generates a friction force, and the friction force is too large to increase the bolus resistance of the user. CONTENT OF THE UTILITY MODEL

[0004] In order to reduce the resistance of the user during the bolus process, one of the purposes of the present application is to provide a rotating assembly.

[0005] The second purpose of the present application is to provide a one-way transmission mechanism, which includes the above-mentioned rotating assembly, and can reduce the resistance of the user during the bolus process.

[0006] One of the purposes of the present application is achieved by using the following technical solution:

[0007] A rotating assembly includes a housing and a rotating component, the rotating component is rotatably arranged in the housing, an inner wall of the housing is provided with a convex ring, an outer side of the rotating component is provided with a limiting ring, and the rotating assembly further includes a low-friction component, the low-friction component is arranged between the convex ring and the limiting ring; during rotation of the rotating component relative to the housing, the low-friction component abuts against and rotates relative to the convex ring, a dynamic friction coefficient between the low-friction component and the convex ring is configured to be smaller than a dynamic friction coefficient between the convex ring and the limiting ring; and / or, during rotation of the rotating component relative to the housing, the low-friction component abuts against and rotates relative to the limiting ring, a dynamic friction coefficient between the low-friction component and the limiting ring is configured to be smaller than the dynamic friction coefficient between the convex ring and the limiting ring.

[0008] By adopting the technical scheme, the low-friction component is additionally arranged between the convex ring and the limiting ring, and the dynamic friction coefficient of at least one of the convex ring and the limiting ring relative to the low-friction component is configured to be lower than the dynamic friction coefficient of the relative rotation between the convex ring and the limiting ring, so that the friction force generated in the relative rotation of the rotating component relative to the shell is reduced, and the injection resistance of the user is further reduced.

[0009] Further, when the rotating component rotates relative to the shell, the low-friction component can abut against the convex ring and rotate relative to the convex ring, and the low-friction component can abut against the limiting ring and rotate relative to the limiting ring.

[0010] Further, the low-friction component includes a first end face and a second end face arranged opposite in the axial direction, the first end face is used to abut against the convex ring, the second end face is used to abut against the limiting ring, and the first end face and the second end face are configured as low-friction end faces, which are PTFE end faces or graphite end faces.

[0011] Further, the low-friction component is configured as a PTFE gasket or a graphite gasket.

[0012] Further, the low-friction component includes a first end face and a second end face arranged opposite in the axial direction, the first end face faces the convex ring, and the second end face faces the limiting ring; one of the first end face and the convex ring is provided with a first abutting protrusion axially close to the other, and / or one of the second end face and the limiting ring is provided with a second abutting protrusion axially close to the other.

[0013] By adopting the technical scheme, the abutting protrusions arranged between the two surfaces abutting against and moving relative to each other can reduce the contact area, so as to reduce the friction force between the two components rotating relative to each other.

[0014] Further, the low-friction component includes a first end face and a second end face arranged opposite in the axial direction, the first end face faces the convex ring, and the second end face faces the limiting ring.

[0015] The first end face and the convex ring cooperatively form a first abutting region and a first gap region, the first abutting region is closer to the rotation axis of the rotating component than the first gap region; and / or, the second end face and the limiting ring cooperatively form a second abutting region and a second gap region, the second abutting region is closer to the rotation axis of the rotating component than the second gap region.

[0016] By adopting the technical scheme, the abutting region is used for abutting during the relative rotation, and the abutting region is arranged closer to the rotation axis, so as to reduce the moment of the friction force when the two components rotate relative to each other, and reduce the injection resistance of the user.

[0017] Further, one of the convex ring and the limiting ring is fixed with the low friction component in the rotation direction, and the other can rotate relative to the low friction component.

[0018] Further, the low friction component is provided with a positioning hole, and the rotating component includes a positioning column segment matched with the positioning hole.

[0019] By adopting the above technical scheme, the low friction component is positioned on the rotating component, which facilitates assembly and can maintain good coaxiality between the low friction component and the rotating component.

[0020] Further, the convex ring is provided with a circular through hole, and the rotating component includes a matched column segment penetrating through the circular through hole.

[0021] By adopting the above technical scheme, good coaxiality between the rotating component and the shell can be maintained, thereby reducing the frictional resistance generated between the rotating component and the shell during rotation.

[0022] The second purpose of the present application is achieved by adopting the following technical scheme:

[0023] The one-way transmission mechanism includes a distal end component, an elastic component, a stop component and the rotating assembly, the limiting ring of the rotating component is located at the distal end side of the convex ring, the distal end component is located at the distal end side of the limiting ring and is fixedly connected with the shell; the stop component is accommodated in the shell between the distal end component and the limiting ring, and the stop component is rotationally coupled with the distal end component; the stop component can move axially from a blocking position to a avoiding position farther away from the limiting ring relative to the limiting ring, the rotating component is prevented from rotating when the stop component is in the blocking position, and the rotating component is allowed to rotate when the stop component is in the avoiding position; the elastic component is used to maintain the stop component in the blocking position, and during the injection process, the rotation of the rotating component in the injection rotation direction can drive the elastic component to deform to move the stop component from the blocking position to the avoiding position.

[0024] In summary, the present application at least includes the following technical effects: a low friction component is additionally arranged between the convex ring and the limiting ring, and the dynamic friction coefficient of at least one of the convex ring and the limiting ring relative to the low friction component is configured to be lower than the dynamic friction coefficient of the relative rotation between the convex ring and the limiting ring, so as to reduce the frictional force generated during the rotation of the rotating component relative to the shell, and further reduce the injection resistance of the user. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is an exploded schematic view of the rotating assembly in the embodiment of the present application;

[0026] Figure 2is a sectional view of a convex ring, a low friction component and a convex ring in the embodiment of the present application;

[0027] Figure 3 is a sectional view of a convex ring provided with a second abutting protrusion in the embodiment of the present application;

[0028] Figure 4 is a sectional view of a low friction component provided with a first abutting protrusion and a second abutting protrusion in the embodiment of the present application;

[0029] Figure 5 is a sectional view of a limiting ring provided with an inclined end surface in the embodiment of the present application;

[0030] Figure 6 is a sectional view of a convex ring provided with a stepped structure in the embodiment of the present application;

[0031] Figure 7 is an exploded schematic view of a one-way transmission mechanism in the embodiment of the present application;

[0032] Figure 8 is a schematic view of a second one-way tooth on a stop component in the embodiment of the present application.

[0033] The reference signs are as follows: 1, a housing; 11, a convex ring; 2, a rotating component; 21, a limiting ring; 211, a first one-way tooth; 22, a matching column segment; 3, a low friction component; 31, a first end surface; 32, a second end surface; 4, a first abutting protrusion; 5, a second abutting protrusion; 6, a distal end component; 7, an elastic component; 8, a stop component; 81, a second one-way tooth; 811, an inclined tooth wall; 812, a vertical tooth wall. DETAILED DESCRIPTION

[0034] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0035] In the description of the utility model, it is necessary to understand that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model. In addition, the features limited by "first" and "second" can be explicitly or implicitly included one or more features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0036] In the description of the utility model, it should be explained that, unless otherwise specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0037] When injecting medicine, a specific injection device is used, and the user sets the dose according to the needs and injects the set dose. Among them, the dose set by the user using the injection device is converted into the displacement or deformation of the part, and when the injection action is implemented, the part that has displacement or deformation moves back to the initial position or initial state, so as to drive the rotating part to rotate relative to the shell of the injection device in the injection rotation direction, and the distal end of the injection device is connected with the cartridge containing the medicine. The rotating rotating part drives the push rod to feed the piston of the cartridge to the distal end, so as to realize the injection of the medicine.

[0038] In the related art, the rotating part is rotatably mounted in the shell, and a limiting ring is arranged on the outer periphery of the rotating part, and a convex ring is arranged in the shell, and the axial position of the rotating part relative to the shell is limited by the limiting ring and the convex ring. In addition, in some injection devices, an elastic part is arranged on the side of the limiting ring away from the convex ring in the shell, and the elastic force of the elastic part makes the limiting ring of the rotating part abut on the convex ring in the shell. During the injection process, the limiting ring of the rotating part and the convex ring in the shell abut against each other to generate friction force. If the friction force is too large, the injection resistance of the user will be increased.

[0039] It should be noted that in the present embodiment, the proximal end refers to the end close to the user's operation, and the distal end refers to the end away from the user's operation; accordingly, the axial direction refers to the direction from the proximal end to the distal end, or from the distal end to the proximal end.

[0040] The present application discloses a rotating assembly applied to an injection device for driving a push rod to feed a cartridge piston distally, and capable of reducing the friction during the rotation of the rotating component, thereby reducing the injection resistance of the user.

[0041] Referring to Figure 1 and Figure 2 , the rotating assembly comprises a housing 1, a rotating component 2 and a low-friction component 3, wherein the housing 1 is a cylindrical structure extending in the axial direction, the rotating component 2 is in the shape of a cylinder as a whole, and the rotating component 2 is rotatably arranged in the housing 1; accordingly, the inner wall of the distal end of the housing 1 is inwardly convexly provided with a convex ring 11 having a circular through hole, the rotating component 2 passes through the circular through hole of the convex ring 11, and the rotating component 2 has a matching column segment 22 for matching the circular through hole, and the matching column segment 22 and the circular through hole of the convex ring 11 are matched to maintain the coaxiality between the rotating component 2 and the housing 1. At the same time, the rotating component 2 comprises a limiting ring 21 convexly provided on the outer wall of the distal end thereof, the limiting ring 21 is located on the distal end side of the convex ring 11, and the low-friction component 3 is arranged between the convex ring 11 and the limiting ring 21; when the rotating component 2 rotates relative to the housing 1, the low-friction component 3 can at least abut one of the convex ring 11 and the limiting ring 21 and rotate relative thereto, and the dynamic friction coefficient between the low-friction component 3 and the component relative to which the low-friction component 3 can rotate is configured to be smaller than the dynamic friction coefficient between the convex ring 11 and the limiting ring 21, so as to reduce the friction when the rotating component 2 rotates relative to the housing 1, thereby reducing the injection resistance of the user.

[0042] In order to further describe the related content of the dynamic friction coefficient, the dynamic friction coefficient between the convex ring 11 and the limiting ring 21 is defined as the reference friction coefficient; it should be noted that the dynamic friction coefficient, as a commonly used parameter related to the inherent material properties of an object, is also called the dynamic friction factor, and the aforementioned reference friction coefficient can be obtained by testing the relative sliding test scenario of the convex ring 11 and the limiting ring 21, or can be obtained by querying and extracting the material of the convex ring 11 and the limiting ring 21 by the person skilled in the art. Thus, the reference friction coefficient between the convex ring 11 and the limiting ring 21 is only used as a comparison object for the dynamic friction coefficient between the low-friction component 3 and the convex ring 11 and the dynamic friction coefficient between the low-friction component 3 and the limiting ring 21. In the actual assembly relationship of the rotating assembly, the convex ring 11 and the limiting ring 21 that can rotate relative to each other can abut and produce sliding friction, or can not abut and not produce sliding friction.

[0043] In some embodiments, when the rotating component 2 rotates relative to the housing 1, the low-friction component 3 can abut the protruding ring 11 and rotate relative to it, and the low-friction component 3 can abut the limiting ring 21 and rotate relative to it. Correspondingly, the dynamic friction coefficient between the low-friction component 3 and the protruding ring 11 is configured to be smaller than the dynamic friction coefficient between the protruding ring 11 and the limiting ring 21, and the dynamic friction coefficient between the low-friction component 3 and the limiting ring 21 is configured to be smaller than the dynamic friction coefficient between the protruding ring 11 and the limiting ring 21, so as to reduce the injection resistance of the user. In addition, in order to facilitate the assembly of the low-friction component 3, the low-friction component 3 is in the shape of a washer with a positioning hole in the center, and the low-friction component 3 can be sleeved on the main body of the rotating component 2 through the positioning hole of the low-friction component 3; further, the rotating component 2 further comprises a positioning column segment capable of cooperating with the positioning hole, for maintaining the good coaxiality between the low-friction component 3 and the rotating component 2; in the specific embodiment, the positioning column segment of the rotating component 2 is also the aforementioned cooperating column segment 22 for cooperating with the circular through hole of the protruding ring 11.

[0044] In other embodiments, when the rotating component 2 rotates relative to the housing 1, the low-friction component 3 and the protruding ring 11 are relatively fixed in the rotating direction, while abutting and rotating relative to the limiting ring 21. Correspondingly, the dynamic friction coefficient between the low-friction component 3 and the limiting ring 21 is configured to be smaller than the dynamic friction coefficient between the protruding ring 11 and the limiting ring 21. In some specific embodiments, the low-friction component 3 and the protruding ring 11 are fixed by bonding or welding, so that they are relatively fixed in the rotating direction; in other specific embodiments, the low-friction component 3 and the protruding ring 11 are provided with a tooth groove cooperation structure on the opposite surfaces to realize the relative fixation of the two in the rotating direction.

[0045] In other embodiments, when the rotating component 2 rotates relative to the housing 1, the low-friction component 3 and the limiting ring 21 are relatively fixed in the rotating direction, while abutting and rotating relative to the protruding ring 11. Correspondingly, the dynamic friction coefficient between the low-friction component 3 and the protruding ring 11 is configured to be smaller than the dynamic friction coefficient between the protruding ring 11 and the limiting ring 21. In some specific embodiments, the low-friction component 3 and the limiting ring 21 are fixed by bonding or welding, so that they are relatively fixed in the rotating direction; in other specific embodiments, the low-friction component 3 and the limiting ring 21 are provided with a tooth groove cooperation structure on the opposite surfaces to realize the relative fixation of the two in the rotating direction.

[0046] In some specific examples of the above embodiments, the low-friction component 3 comprises a low-friction end face, for example, the contact surface of the low-friction component 3 against the convex ring 11 is configured as a low-friction end face, so that the dynamic friction coefficient between the low-friction component 3 and the convex ring 11 is less than the dynamic friction coefficient between the convex ring 11 and the limiting ring 21; or for example, the contact surface of the low-friction component 3 against the limiting ring 21 is configured as a low-friction end face, so that the dynamic friction coefficient between the low-friction component 3 and the limiting ring 21 is less than the dynamic friction coefficient between the convex ring 11 and the limiting ring 21; correspondingly, the aforementioned low-friction end face can be a PTFE end face or a graphite end face in specific examples. In addition, in some other specific examples of the above embodiments, the low-friction component 3 is configured as a low-friction gasket as a whole, for example, a PTFE gasket or a graphite gasket. Wherein, PTFE is polytetrafluoroethylene.

[0047] Referring to Figure 1 and Figure 2 In some examples in which the low-friction component 3 can be in contact with the convex ring 11 and rotate relative to the convex ring 11, and can be in contact with the limiting ring 21 and rotate relative to the limiting ring 21, the low-friction component 3 comprises a first end face 31 and a second end face 32 arranged opposite to each other in the axial direction, the first end face 31 is configured to contact the convex ring 11, and the second end face 32 is configured to contact the limiting ring 21; correspondingly, the first end face 31 and the second end face 32 are configured as low-friction end faces, and the low-friction end faces are specifically PTFE end faces or graphite end faces. In other examples in which the low-friction component 3 can rotate relative to any one of the convex ring 11 and the limiting ring 21, the low-friction component 3 is configured as a low-friction gasket as a whole, for example, a PTFE gasket or a graphite gasket.

[0048] Further, in some examples in which the low-friction component 3 can rotate relative to any one of the convex ring 11 and the limiting ring 21, the low-friction component 3 comprises a first end face 31 and a second end face 32 arranged opposite to each other in the axial direction. Wherein, the first end face 31 faces the convex ring 11, and the second end face 32 faces the limiting ring 21, and a contact protrusion is arranged between the first end face 31 and the convex ring 11 and / or between the second end face 32 and the limiting ring 21, for reducing the contact area of the two components during relative rotation, thereby reducing the friction during rotation.

[0049] In some embodiments provided with a contact protrusion, the first end face 31 of the low-friction component 3 and one of the convex ring 11 are provided with a first contact protrusion 4 axially close to the other; by providing the first contact protrusion 4, the contact area of the first end face 31 and the convex ring 11 can be reduced, thereby reducing the friction during rotation of the two. Figure 3 In specific examples, the first contact protrusion 4 is arranged on the surface of the convex ring 11 facing the first end face 31; in other examples, the first contact protrusion 4 can also be arranged on the first end face 31 of the low-friction component 3.

[0050] In some other embodiments provided with the interference protrusions, the second end surface 32 of the low-friction component 3 is provided with a second interference protrusion 5 axially approaching one of the limiting rings 21; by providing the second interference protrusion 5, the contact area between the second end surface 32 and the convex ring 11 can be reduced, so as to reduce the friction when the two rotate. In specific examples, the second interference protrusion 5 can be provided on the surface of the limiting ring 21 facing the second end surface 32, or on the second end surface 32 of the low-friction component 3.

[0051] In some other embodiments provided with the interference protrusions, the first end surface 31 of the low-friction component 3 is provided with a first interference protrusion 4 axially approaching one of the convex rings 11, and the second end surface 32 of the low-friction component 3 is provided with a second interference protrusion 5 axially approaching one of the limiting rings 21. Referring to Figure 4 In specific examples, the first interference protrusion 4 is provided on the first end surface 31 of the low-friction component 3, and the second interference protrusion 5 is provided on the second end surface 32 of the low-friction component 3, i.e., the interference protrusions are provided on the opposite two end surfaces of the low-friction component 3; in other examples, the first interference protrusion 4 can be provided on the convex ring 11, and the second interference protrusion 5 can be provided on the limiting ring 21.

[0052] It can be understood that, in the above embodiments, the first interference protrusion 4 and the second interference protrusion 5 can be provided in the form of convex rings 11, convex points or other shapes.

[0053] Further, in some examples in which the low-friction component 3 can rotate relative to any one of the convex ring 11 and the limiting ring 21, the low-friction component 3 comprises a first end surface 31 and a second end surface 32 arranged opposite along the axial direction, the first end surface 31 faces the convex ring 11, and the second end surface 32 faces the limiting ring 21. In some specific examples, the first end surface 31 and the convex ring 11 are cooperatively provided with a first interference region and a first gap region, the first interference region is closer to the rotation axis of the rotating component 2 than the first gap region, which can reduce the moment of the friction when the two relatively rotate, so as to reduce the injection resistance of the user; in other specific examples, the second end surface 32 and the limiting ring 21 are cooperatively provided with a second interference region and a second gap region, the second interference region is closer to the rotation axis of the rotating component 2 than the second gap region, which can reduce the moment of the friction when the two relatively rotate, so as to reduce the injection resistance of the user; in other specific examples, the first end surface 31 and the convex ring 11 are cooperatively provided with a first interference region and a first gap region, and the first interference region is closer to the rotation axis of the rotating component 2 than the first gap region, and the second end surface 32 and the limiting ring 21 are cooperatively provided with a second interference region and a second gap region, and the second interference region is closer to the rotation axis of the rotating component 2 than the second gap region.

[0054] It should be noted that the first and second abutment regions refer to the regions between the adjacent components that abut each other, and the first and second gap regions refer to the regions between the adjacent components that form a gap. In a specific example, one of the opposite end surfaces of the adjacent components can be arranged in an inclined manner, so that the distance between the two end surfaces gradually increases in the direction radially outward; refer to Figure 5 The end surface of the limiting ring 21 is arranged in an inclined manner from the inside to the outside towards the second end surface 32 of the low-friction component 3, and in the enlarged view of the sectional view shown in Figure 5 The end surface profile line of the limiting ring 21 and the profile line of the second end surface 32 form an angle α, so that the area of the limiting ring 21 close to the rotation axis abuts the second end surface 32, and the area of the limiting ring 21 away from the rotation axis forms a gap with the second end surface 32. In addition, in other specific examples, one of the opposite end surfaces of the adjacent components can be arranged in a stepped manner, so that the step close to the rotation axis abuts, and the step away from the rotation axis forms a gap; refer to Figure 6 The convex ring 11 is arranged in a stepped manner towards the surface of the first end surface 31 of the low-friction component 3.

[0055] The rotating assembly disclosed in the embodiments of the present application is applied to an injection device, for driving the push rod to feed the distal end to push the piston of the cartridge. By arranging the low-friction component 3 between the convex ring 11 and the limiting ring 21, and configuring the dynamic friction coefficient of at least one of the convex ring 11 and the limiting ring 21 relative to the low-friction component 3 to be lower than the dynamic friction coefficient of the relative rotation between the convex ring 11 and the limiting ring 21, the purpose of reducing the rotating friction of the rotating component 2 is achieved, and the injection resistance of the user is reduced.

[0056] Refer to Figure 7The application also discloses a one-way transmission mechanism, which comprises a distal part 6, an elastic part 7, a stop part 8 and the rotating assembly described above, wherein the limiting ring 21 of the rotating part 2 is located at the distal side of the convex ring 11, the distal part 6 is located at the distal side of the limiting ring 21 and is fixedly connected with the shell 1, so that the distal part 6 cannot rotate relative to the shell 1 and cannot move relative to the shell 1. Meanwhile, the shell 1 between the distal part 6 and the limiting ring 21 is formed with a containing space, the stop part 8 is contained in the containing space, and the stop part 8 and the distal part 6 form an anti-rotation connection, so that the stop part 8 cannot rotate relative to the distal part 6 and the shell 1; in addition, the stop part 8 can move axially in the containing space, that is, the stop part 8 can move axially from a blocking position to a avoiding position which is farther away from the limiting ring 21 relative to the limiting ring 21, and the rotating part 2 is prevented from rotating when the stop part 8 is in the blocking position, and the rotating part 2 is allowed to rotate when the stop part 8 is in the avoiding position. The elastic part 7 is a spring arranged between the stop part 8 and the distal part 6, and the elastic part 7 is used for maintaining the stop part 8 in the blocking position, and the elastic part 7 also makes the limiting ring 21 of the rotating part 2 abut against the convex ring 11 in the shell 1 with low friction.

[0057] Meanwhile, during the injection process, the rotation of the rotating part 2 in the injection rotation direction can drive the elastic part 7 to deform so that the stop part 8 moves from the blocking position to the avoiding position. Specifically, the distal surface of the limiting ring 21 of the rotating part 2 is provided with first one-way teeth 211, and the proximal surface of the stop part 8 is correspondingly provided with second one-way teeth 81 which are matched with the first one-way teeth 211. Under the elastic force of the elastic part 7, the stop part 8 is in the blocking position close to the rotating part 2, so that the second one-way teeth 81 are engaged in the first one-way teeth 211, and the first one-way teeth 211 and the second one-way teeth 81 are provided as inclined teeth. Figure 8 The first one-way teeth 211 and the second one-way teeth 81 have inclined tooth walls 811 and vertical tooth walls 812. When the rotating part 2 has a tendency to rotate in the first direction, the vertical tooth wall 812 of the first one-way teeth 211 abuts against the vertical tooth wall 812 of the second one-way teeth 81, thereby preventing the rotating part 2 from rotating in the first direction; when the rotating part 2 has a tendency to rotate in the second direction, the inclined tooth wall 811 of the first one-way teeth 211 abuts against and slides relative to the inclined tooth wall 811 of the second one-way teeth 81, thereby driving the stop part 8 to move from the blocking position to the avoiding position, and allowing the rotating part 2 to rotate in the second direction. Specifically, in this embodiment, from the perspective of looking from the proximal end to the distal end, the first direction is the clockwise direction, the second direction is the counterclockwise direction, and the second direction is the injection rotation direction of the rotating part 2 when the injection device performs the injection action.

[0058] The distal part 6, the elastic part 7 and the stop part 8 in the one-way transmission mechanism can be the existing distal part 6, the elastic part 7 and the stop part 8 on the market as long as they can play the corresponding roles, but by combining the rotating assembly with the distal part 6, the elastic part 7 and the stop part 8, the resistance of the user when using the injection device with the one-way transmission mechanism to perform the injection operation can be reduced.

[0059] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0060] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A rotating assembly, comprising a housing and a rotating component, the rotating component being rotatably disposed within the housing, the inner wall of the housing having a protruding ring, and the outer side of the rotating component having a limiting ring, characterized in that, The rotating assembly further comprises a low-friction component arranged between the convex ring and the limiting ring; During rotation of the rotating component relative to the housing, the low-friction component is in contact with and rotates relative to the convex ring, and the dynamic friction coefficient between the low-friction component and the convex ring is configured to be smaller than the dynamic friction coefficient between the convex ring and the limiting ring. During rotation of the rotating component relative to the housing, the low-friction component is in contact with and rotates relative to the limiting ring, and the dynamic friction coefficient between the low-friction component and the limiting ring is configured to be smaller than the dynamic friction coefficient between the convex ring and the limiting ring.

2. The rotary assembly of claim 1, wherein, When the rotating component rotates relative to the housing, the low-friction component can be in contact with and rotate relative to the convex ring, and the low-friction component can be in contact with and rotate relative to the limiting ring.

3. The rotary assembly of claim 2, wherein, The low-friction component comprises a first end face and a second end face arranged opposite in the axial direction, the first end face is configured to be in contact with the convex ring, and the second end face is configured to be in contact with the limiting ring, and the first end face and the second end face are configured as low-friction end faces, which are PTFE end faces or graphite end faces.

4. The rotary assembly of claim 2, wherein, The low-friction component is configured as a PTFE gasket or a graphite gasket.

5. The rotary assembly of claim 2, wherein, The low-friction component comprises a first end face and a second end face arranged opposite in the axial direction, the first end face is configured to be in contact with the convex ring, and the second end face is configured to be in contact with the limiting ring, and the first end face and the second end face are configured as low-friction end faces, which are PTFE end faces or graphite end faces.

6. The rotary union of claim 2, wherein, The low-friction component comprises a first end face and a second end face arranged opposite in the axial direction, the first end face is configured to be in contact with the convex ring, and the second end face is configured to be in contact with the limiting ring, and the first end face and the second end face are configured as low-friction end faces, which are PTFE end faces or graphite end faces. The first end face and the convex ring cooperatively form a first contact area and a first gap area, and the first contact area is closer to the rotation axis of the rotating component than the first gap area; and / or, the second end face and the limiting ring cooperatively form a second contact area and a second gap area, and the second contact area is closer to the rotation axis of the rotating component than the second gap area.

7. The rotary union of claim 2, wherein The low-friction component is provided with a positioning hole, and the rotating component comprises a positioning column segment cooperatively arranged with the positioning hole.

8. The rotary union of claim 1, wherein, The convex ring is provided with a circular through hole, and the rotating component comprises a cooperatively arranged column segment passing through the circular through hole.

9. The rotary union of claim 1, wherein, One of the convex ring and the limiting ring is fixed in the rotating direction with the low-friction component, and the other can rotate relative to the low-friction component.

10. A one-way drive mechanism characterized in that, The rotating assembly comprises a distal component, an elastic component, a stop component, and a rotating assembly as claimed in any one of claims 1 to 9, the limiting ring of the rotating component is on the distal side of the convex ring, the distal component is on the distal side of the limiting ring and is fixedly connected with the housing; The stop component is accommodated in the housing between the distal end component and the limiting ring, and is rotationally coupled with the distal end component; the stop component is axially movable relative to the limiting ring from a blocking position to a avoiding position farther away from the limiting ring, the rotation of the rotating component is prevented when the stop component is in the blocking position, and the rotation of the rotating component is allowed when the stop component is in the avoiding position; The elastic component is used for maintaining the stop component in the blocking position, and the rotation of the rotating component in the injection rotation direction during the injection can drive the elastic component to deform so as to move the stop component from the blocking position to the avoiding position.

Images