CN214331292U - Spring receiving structure and hydraulic clutch device provided with same - Google Patents
Spring receiving structure and hydraulic clutch device provided with same Download PDFInfo
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- CN214331292U CN214331292U CN202120255980.5U CN202120255980U CN214331292U CN 214331292 U CN214331292 U CN 214331292U CN 202120255980 U CN202120255980 U CN 202120255980U CN 214331292 U CN214331292 U CN 214331292U
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- peripheral side
- wall surface
- side wall
- spring
- spring receiving
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Abstract
The utility model provides a can keep the spring of spring to accept the structure and possess the hydraulic clutch that this spring accepted the structure steadily, the spring accepts the structure and includes: a spring holding portion having an outer peripheral side wall surface formed on an outer peripheral side and an inner peripheral side wall surface formed on an inner peripheral side and opposed to the outer peripheral side wall surface, the outer peripheral side wall surface including a plurality of outer concave portions concave to a radially outer side, the inner peripheral side wall surface including a plurality of inner concave portions concave to a radially inner side, a plurality of accommodation spaces for holding a plurality of springs being formed between the outer peripheral side wall surface and the inner peripheral side wall surface, the plurality of accommodation spaces being arranged along a circumferential direction, each of the accommodation spaces being defined by at least the outer concave portion and the inner concave portion opposed to each other in a radial direction, thereby enabling each of the accommodation spaces to hold at least one of the springs.
Description
Technical Field
The present invention relates to a spring receiving structure and a hydraulic clutch device having the same, and more particularly to a spring receiving structure used in a hydraulic clutch device, and particularly to a spring receiving structure used in a hydraulic clutch device of a transmission.
Background
As an automatic transmission used in an automobile or the like, there is known a CVT multiple disk clutch (continuously variable transmission) or the like in which a transmission state of a drive torque is controlled by engaging and disengaging a multiple disk clutch by a pressing force of a piston receiving a hydraulic pressure.
Fig. 3 is a cross-sectional view in a single side, which schematically shows a conventional hydraulic clutch device cut along a plane passing through the axis O, and fig. 4 is a cross-sectional view in a quarter of the cross-sectional view taken along a plane perpendicular to the axis O at the position of line IV in fig. 3.
The hydraulic clutch apparatus shown in fig. 3 includes an annular clutch cylinder 1 that rotates together with a drive shaft, not shown. The clutch cylinder 1 is provided with a piston 2 disposed so as to be movable in the axial direction and defining a hydraulic chamber a with the clutch cylinder 1, and a spring receiving structure 300 having an inner peripheral edge locked to an inner cylindrical portion of the clutch cylinder 1 and capable of receiving a coil spring 4 described later, the spring receiving structure 300 also functions as a hydraulic pressure compensator defining a balance liquid chamber B in a space located on the opposite side of the hydraulic chamber a with respect to the piston 2, and the coil spring 4 is mounted in a compressed state between the piston 2 and the spring receiving structure 300. Furthermore, a multiplate clutch 5 is shown.
The piston 2 includes a piston main body 21 and seals 22 and 23 slidably and closely attached to the outer cylinder portion and the inner cylinder portion of the clutch cylinder 1. The spring receiving structure 300 includes a receiving body 301 and a seal member 302 located on an outer peripheral edge of the receiving body 301 and slidably and closely attached to an inner peripheral surface of an outer cylindrical portion of the piston main body 21. Further, a pressure guide port C for introducing a control hydraulic pressure into the hydraulic chamber a and a compensation port D for supplying the working fluid to the equilibrium fluid chamber B are opened in the inner cylinder portion of the clutch cylinder 1.
The coil spring 4 continuously biases the piston 2 in a direction to reduce the volume of the hydraulic chamber a, and as shown in fig. 4, a plurality of coil springs 4 are arranged in the circumferential direction of the hydraulic clutch device.
The multiple disk clutch 5 has a structure in which a plurality of drive plates 51 and a plurality of driven plates 52 are alternately arranged in the axial direction, wherein the drive plates 51 are engaged with an outer cylinder portion of the clutch cylinder 1 in the circumferential direction so as to be movable in the axial direction, and the driven plates 52 are engaged with a clutch boss 53 provided on a driven shaft side, not shown, in the circumferential direction so as to be movable in the axial direction.
In the hydraulic clutch device having the above-described configuration, by applying or releasing hydraulic pressure to the hydraulic chamber a via the pilot port C, the piston 2 is displaced in the axial direction within the clutch cylinder 1, whereby the drive plate 51 and the driven plate 52 of the multiple disc clutch 5 are frictionally engaged or disengaged to perform a clutch engaging/disengaging operation.
SUMMERY OF THE UTILITY MODEL
Problem to be solved by utility model
As shown in fig. 3 and 4, in the spring receiving structure 300, a spring holding portion 301a is formed to receive the coil spring 4, and a plurality of concave portions corresponding to the respective coil springs 4 are formed in an inner peripheral surface of the spring holding portion 301a in the circumferential direction. However, during the clutch engagement/disengagement operation, the clutch cylinder 1 and the piston 2 rotate around the axial center O together with the drive shaft, and therefore, the above-described hydraulic clutch device still has a risk that the coil spring 4 cannot be stably held.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a spring receiving structure capable of stably holding a coil spring, and a hydraulic clutch device having the same.
Means for solving the problems
The spring receiving structure according to claim 1, comprising: a spring holding portion having an outer peripheral side wall surface formed on an outer peripheral side and an inner peripheral side wall surface formed on an inner peripheral side and opposed to the outer peripheral side wall surface, the outer peripheral side wall surface including a plurality of outer concave portions concave to a radially outer side, the inner peripheral side wall surface including a plurality of inner concave portions concave to a radially inner side, a plurality of accommodation spaces for holding a plurality of springs being formed between the outer peripheral side wall surface and the inner peripheral side wall surface, the plurality of accommodation spaces being arranged along a circumferential direction, each of the accommodation spaces being defined by at least the outer concave portion and the inner concave portion opposed to each other in a radial direction, thereby enabling each of the accommodation spaces to hold at least one of the springs.
In addition, it should be noted that "opposite" is understood to include both "opposite" and "opposite at an angle in the circumferential direction.
The spring receiving structure according to claim 2, wherein the outer peripheral side wall surface further has a plurality of inner convex portions that protrude radially inward, the inner peripheral side wall surface further has a plurality of outer convex portions that protrude radially outward, and each of the accommodation spaces is defined by at least the outer concave portion and the inner concave portion that oppose each other in the radial direction, and the inner convex portion and the outer convex portion that oppose each other in the radial direction.
In the spring receiving structure according to claim 3, at least 2 of the accommodating spaces are circumferentially communicated with each other.
In the spring receiving structure according to claim 4, the accommodation spaces adjacent to each other are all communicated in the circumferential direction.
The spring receiving structure according to claim 5, wherein the outer peripheral side wall surface has a wavy circumferential cross section, and/or the inner peripheral side wall surface has a wavy circumferential cross section.
The spring receiving structure according to claim 6, wherein a circumferential cross section of the outer recess has a curved shape, and/or a circumferential cross section of the inner recess has a curved shape.
The spring receiving structure according to claim 7, wherein a circumferential cross section of the outer concave portion has a circular arc shape, and/or a circumferential cross section of the inner concave portion has a circular arc shape.
The spring receiving structure according to claim 8, wherein each of the receiving spaces is configured to hold 1 of the springs.
The spring receiving construction of claim 9, wherein each of the housing spaces is defined by one of the outer concave portions and one of the inner concave portions that are opposed to each other in the radial direction, one of the inner convex portions and one of the outer convex portions that are opposed to each other in the radial direction on one side in the circumferential direction, and one of the inner convex portions and one of the outer convex portions that are opposed to each other in the radial direction on the other side in the circumferential direction.
The spring receiving structure according to claim 10, wherein a bottom wall of the spring holding portion defines a bottom surface of the accommodating space for supporting the spring.
The spring receiving structure according to claim 11 is a coil spring that presses a piston in the hydraulic clutch device.
The hydraulic clutch device according to claim 12, comprising: a clutch cylinder; a piston mounted to the clutch cylinder axially movable relative to the clutch cylinder; and a clutch engageable by driving of the piston, wherein the hydraulic clutch device further includes: the spring receiving structure according to any one of claims 1 to 11; and a plurality of coil springs attached to the housing space of the spring receiving structure, the plurality of coil springs applying a pressing force to the piston to move the piston away from the clutch.
Effect of the utility model
The spring receiving structure according to claim 1 includes a spring holding portion having an outer peripheral side wall surface formed on an outer peripheral side and an inner peripheral side wall surface formed on an inner peripheral side and opposed to the outer peripheral side wall surface, the outer peripheral side wall surface including a plurality of outer concave portions recessed radially outward, and the inner peripheral side wall surface including a plurality of inner concave portions recessed radially inward. A plurality of accommodation spaces for holding a plurality of springs are formed between the outer peripheral side wall surface and the inner peripheral side wall surface, the plurality of accommodation spaces being arranged in the circumferential direction, each accommodation space being formed between the outer peripheral side wall surface and the inner peripheral side wall surface, each accommodation space being defined at least on the radially inner and outer sides by outer and inner recesses opposing each other in the radial direction, thereby enabling each accommodation space to hold at least one spring. Therefore, the spring can be stably held.
With the spring receiving structure according to claim 2, the outer peripheral side wall surface further has a plurality of inward protrusions protruding radially inward, the inner peripheral side wall surface further has a plurality of outward protrusions protruding radially outward, and each of the accommodation spaces is defined by at least an outward concave portion and an inward concave portion opposing each other in the radial direction, and an inward convex portion and an outward convex portion opposing each other in the radial direction. Therefore, the spring in the housing space can be more reliably partitioned, so that the spring can be more stably held.
With the spring receiving structure according to claim 3, at least 2 accommodating spaces are circumferentially communicated. Therefore, it is possible to avoid an increase in manufacturing cost and manufacturing risk due to the formation of the wall partitioning the accommodating space, and it is possible to increase the accommodating space to allow more springs to be installed, as compared with the case where the accommodating space is partitioned by the wall.
With the spring receiving structure according to claim 4, the accommodation spaces adjacent to each other are all communicated in the circumferential direction. Therefore, the rise of the manufacturing cost and the manufacturing risk can be further avoided, and the accommodation space can be further increased to allow more springs to be mounted, as compared with the case where the accommodation spaces are separated from each other by the wall.
With the spring receiving structure according to claim 5, the outer peripheral side wall surface has a wavy circumferential cross section, and/or the inner peripheral side wall surface has a wavy circumferential cross section. Therefore, the shape of the spring can be better matched, and the spring can be more stably held.
With the spring receiving structure according to claim 6, a circumferential cross section of the outer recess has a curved shape, and/or a circumferential cross section of the inner recess has a curved shape. Therefore, the accommodation space can be better matched to the shape of the spring, thereby holding the spring more stably.
With the spring receiving structure according to claim 7, the circumferential cross section of the outer concave portion has an arc shape, and/or the circumferential cross section of the inner concave portion has an arc shape. Therefore, the accommodation space can be better matched to the shape of the spring, thereby holding the spring more stably.
With the spring receiving structure according to claim 8, each accommodating space is used to hold 1 spring. The springs can be individually held, and the springs can be held more stably.
With the spring receiving construction of claim 9, each of the accommodating spaces is defined by one outer concave portion and one inner concave portion that are opposed to each other in the radial direction, one inner convex portion and one outer convex portion that are opposed to each other in the radial direction on one side in the circumferential direction, and one inner convex portion and one outer convex portion that are opposed to each other in the radial direction on the other side in the circumferential direction. Therefore, the spring can be held more reliably.
With the spring receiving structure according to claim 10, the bottom wall of the spring holding portion defines a bottom surface of the accommodating space for supporting the spring. Therefore, the housing space is formed simply, and the spring can be held more reliably. In particular, the plurality of accommodation spaces may be integrally formed in the spring holding portion by casting processing or the like. Thereby, the amount of material used and the weight of the device can be reduced compared to forming a plurality of accommodation spaces independently of the spring holder by using additional elements attached to the spring holder.
Of course, the present application is not limited to a scheme in which a plurality of accommodation spaces are integrally formed in the spring holding portion.
In the spring receiving structure according to claim 11, the spring is a coil spring that presses the piston in the clutch device. The coil spring has a simple and compact structure, reliable performance and low cost, and can reliably hold the spring even if the piston rotates.
A hydraulic clutch device according to claim 12 is adopted, which includes a clutch cylinder, a piston attached to the clutch cylinder so as to be axially movable relative to the clutch cylinder, a clutch engageable by driving of the piston, a spring receiving structure according to the present application, and a plurality of coil springs attached to an accommodating space of the spring receiving structure. The hydraulic clutch device can obtain the corresponding technical effect which can be obtained by the spring bearing structure. In particular, the spring receiving structure can stably hold the coil spring, and the hydraulic clutch device can stably and reliably operate to suppress occurrence of a failure.
Drawings
Fig. 1 is a plan view of a spring receiving structure according to an embodiment of the present invention.
Fig. 2 is a side sectional view of the spring receiving structure of fig. 1 taken along line W-W.
Fig. 3 is a cross-sectional view of a conventional hydraulic clutch device in a single side, which is a plane passing through the axis O.
Fig. 4 is a quarter sectional view taken at a plane orthogonal to the axis O at the position of line IV in fig. 3.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The vertical and horizontal directions are set for convenience of explanation of the spring receiving structure of the present invention, and are not necessarily equal to the actual directions after installation in the hydraulic pressure separating apparatus.
The utility model discloses an embodiment's spring is accepted the structure and can be applied to hydraulic clutch, and it is used for supporting a plurality of coil spring's that press to the piston a tip. As can be understood from fig. 3, the hydraulic clutch device includes an annular clutch cylinder that rotates together with the drive shaft, a piston that is disposed in the clutch cylinder so as to be movable in the axial direction and that forms a hydraulic chamber between the clutch cylinder and the piston, a plurality of coil springs that are attached in a compressed state and that apply force to the piston, and a clutch.
The hydraulic clutch device further includes a spring receiving structure 3 that receives one end portions of the plurality of coil springs that press the piston, in other words, the plurality of coil springs are arranged between the piston and the spring receiving structure in the circumferential direction.
Examples
The structure of the spring receiving structure 3 according to the embodiment will be described in detail below with reference to fig. 1 and 2. Fig. 1 is a plan view of a spring receiving structure according to an embodiment of the present invention, and fig. 2 is a single-side sectional view of the spring receiving structure of fig. 1 taken along the line W-W.
As shown in fig. 1 and 2, the spring receiving structure 3 is annular in plan view, and the inner peripheral edge thereof can be engaged with the inner cylindrical portion of the clutch cylinder. On the upper surface of the spring receiving structure 3, that is, the surface facing the piston side, a spring holding portion 30 is formed, and the spring holding portion 30 includes a bottom wall 31, an outer peripheral side wall surface 32 formed on the outer peripheral side, and an inner peripheral side wall surface 33 formed on the inner peripheral side. The outer peripheral side wall surface 32 and the inner peripheral side wall surface 33 are disposed to face each other (to face each other in fig. 1). The outer peripheral side wall surface 32 includes a plurality of outer concave portions 32a recessed radially outward and a plurality of inner convex portions 32b projecting radially inward, the inner peripheral side wall surface 33 includes a plurality of inner concave portions 33a recessed radially inward and a plurality of outer convex portions 33b projecting radially outward, the outer concave portions 32a and the inner convex portions 32b are alternately arranged in the circumferential direction, and the inner concave portions 33a and the outer convex portions 33b are alternately arranged in the circumferential direction. The outer concave portion 32a and the inner concave portion 33a have circular arc-shaped circumferential cross sections, wherein the circumferential cross section is a cross section perpendicular to the axial direction. Therefore, a substantially circular accommodation space 30a is formed between the outer concave portion 32a and the inner concave portion 33a opposed to each other. More specifically, the accommodation space 30a is a space surrounded by the outer concave portion 32a and the inner convex portions 32b on both sides in the circumferential direction thereof, and the inner concave portion 33a and the outer convex portions 33b on both sides in the circumferential direction thereof. The bottom wall 31 defines a bottom surface of the housing space 30a for abutting against one end portion of the coil spring, and as shown in fig. 2, the spring holding portion 30 is formed in a recessed shape in side view, an outer peripheral side wall surface 32 and an inner peripheral side wall surface 33 extend upward (i.e., to the right in the drawing) from the bottom wall 31, the housing space 30a has a diameter slightly larger than that of the coil spring for housing the coil spring, and the center of the housing space 30a substantially coincides with the center of the coil spring.
The outer peripheral side wall surface 32 and the inner peripheral side wall surface 33 each have a wavy circumferential cross section as a whole. Specifically, the outer concave portion 32a and the inner concave portion 33a are formed as a valley, the inner convex portion 32b and the outer convex portion 33b are formed as a peak, the outer peripheral side wall surface 32 and the inner peripheral side wall surface 33 are arranged with a space therebetween, the distance between the outer peripheral side wall surface 32 and the inner peripheral side wall surface 33 is smaller at the peak and larger at the valley, and the plurality of accommodation spaces 30a are arranged in the circumferential direction and communicate with each other to form an annular groove.
With the spring receiving structure of the embodiment, since the housing space 30a is surrounded by the outer concave portion 32a and the inner convex portion 32b on both sides in the circumferential direction thereof, and the inner concave portion 33a and the outer convex portion 33b on both sides in the circumferential direction thereof, the coil spring can be stably held in the housing space 30 a.
In addition, if the outer circumferential protrusion and the inner circumferential protrusion are connected to each other, that is, if the adjacent housing spaces 30a are partitioned by the wall, in the case where the coil springs are increased in order to increase the pressing force to the piston, the distance between the coil springs needs to be reduced, and therefore, the wall has to be thinned, which leads to an increase in manufacturing cost and manufacturing risk. On the other hand, according to the spring receiving structure of the embodiment, since the housing spaces 30a for housing the coil springs are formed so as to communicate with each other, no wall for partitioning these spaces is formed between the adjacent housing spaces 30a, and it is possible to prevent the increase in manufacturing cost and manufacturing risk due to the formation of the wall for partitioning the housing spaces 30a while housing each coil spring in each housing space 30 a.
Others
In the spring receiving structure in the embodiment, the outer peripheral side wall surface 32 has the outer concave portion 32a and the inner convex portion 32b, but only one of the outer concave portion 32a and the inner convex portion 32b may be provided as long as the accommodating space 30a for accommodating the coil spring is formed in cooperation with the inner peripheral side wall surface 33. Similarly, the inner peripheral side wall surface 33 may have only one of the inner concave portion 33a and the outer convex portion 33 b.
It will be appreciated that the projections and recesses are relative. For example, the outer peripheral side wall surface 32 has a plurality of outer recessed portions 32a described with reference to the inscribed first virtual circumferential surface R1 of the inner projecting portion 32 b. The outer peripheral side wall surface 32 has a plurality of inner protrusions 32b, which is described with reference to a circumscribed second virtual circumferential surface R2 of the outer concave portion 32 a. The outer peripheral side wall surface 32 has a plurality of outer concave portions 32a and a plurality of inner convex portions 32b, which are expressed by reference to a third imaginary circumferential surface R3 between the first imaginary circumferential surface R1 and the second imaginary circumferential surface R2.
In the spring receiving structure in the embodiment, the outer concave portion 32a and the inner concave portion 33a are recessed in an arc shape toward the radially outer side and the radially inner side, respectively, but the recessed shapes of the outer concave portion 32a and the inner concave portion 33a are not limited thereto, and may be other smooth curved shapes, or may be a shape in a planar view with edges, for example, a trapezoidal shape, as long as the housing space 30a for housing the coil spring can be enclosed.
In the spring receiving structure of the embodiment, the accommodating spaces 30a of the respective spring holding portions 30 are formed continuously with each other in a ring shape, but the invention is not limited thereto, and may be a structure in which at least 2 accommodating spaces 30a are connected in one group and the groups of the respective accommodating spaces 30a are spaced apart.
In the spring receiving structure in the embodiment, the outer peripheral side wall surface 32 and the inner peripheral side wall surface 33 each have a wavy circumferential cross section, but the present invention is not limited thereto, and one of the outer peripheral side wall surface 32 and the inner peripheral side wall surface 33 may have a wavy circumferential cross section.
In the spring receiving structure in the embodiment, the outer recesses 32a and the inner recesses 33a are formed in one-to-one correspondence, but the invention is not limited thereto, and a structure in which different numbers of outer recesses 32a and inner recesses 33a are opposed to each other is also possible, for example, 1 outer recess 32a corresponds to a plurality of inner recesses 33a or a plurality of outer recesses 32a corresponds to 1 inner recess 33 a.
Claims (12)
1. A spring receiving formation, comprising:
a spring holding portion having an outer peripheral side wall surface formed on an outer peripheral side and an inner peripheral side wall surface formed on an inner peripheral side and opposed to the outer peripheral side wall surface,
the outer peripheral side wall surface includes a plurality of outer concave portions that are concave outward in the radial direction, the inner peripheral side wall surface includes a plurality of inner concave portions that are concave inward in the radial direction,
a plurality of accommodation spaces for holding a plurality of springs are formed between the outer peripheral sidewall surface and the inner peripheral sidewall surface, the plurality of accommodation spaces being arranged along a circumferential direction, each of the accommodation spaces being defined by at least the outer recessed portion and the inner recessed portion which are opposed to each other in a radial direction, thereby enabling each of the accommodation spaces to hold at least one of the springs.
2. The spring receiving construction of claim 1,
the outer peripheral side wall surface further has a plurality of inner convex portions projecting radially inward, the inner peripheral side wall surface further has a plurality of outer convex portions projecting radially outward, and each of the accommodation spaces is defined by at least the outer concave portion and the inner concave portion opposed to each other in the radial direction, and the inner convex portion and the outer convex portion opposed to each other in the radial direction.
3. The spring receiving construction according to claim 1 or 2,
at least 2 of the accommodation spaces are communicated in a circumferential direction.
4. The spring receiving construction according to claim 1 or 2,
the accommodation spaces adjacent to each other are all communicated in the circumferential direction.
5. The spring receiving construction according to claim 1 or 2,
the outer peripheral side wall surface has an undulating circumferential cross section, and/or the inner peripheral side wall surface has an undulating circumferential cross section.
6. The spring receiving construction according to claim 1 or 2,
the circumferential cross-section of the outer recess has a curved shape and/or the circumferential cross-section of the inner recess has a curved shape.
7. The spring receiving construction according to claim 1 or 2,
the circumferential cross section of the outer recess has a circular arc shape, and/or the circumferential cross section of the inner recess has a circular arc shape.
8. The spring receiving construction according to claim 1 or 2,
each of the receiving spaces is for holding 1 of the springs.
9. The spring receiving construction of claim 2,
each of the accommodation spaces is defined by one of the outer concave portions and one of the inner concave portions that are opposed to each other in the radial direction, one of the inner convex portions and one of the outer convex portions that are opposed to each other in the radial direction on one side in the circumferential direction, and one of the inner convex portions and one of the outer convex portions that are opposed to each other in the radial direction on the other side in the circumferential direction.
10. The spring receiving construction according to claim 1 or 2,
the bottom wall of the spring holding portion defines a bottom surface of the accommodating space for supporting the spring.
11. The spring receiving structure according to claim 1 or 2, wherein the spring is a coil spring that presses a piston in the hydraulic clutch device.
12. A hydraulic clutched device, comprising:
a clutch cylinder;
a piston mounted to the clutch cylinder axially movable relative to the clutch cylinder; and
a clutch engageable by actuation of the piston,
characterized in that, the hydraulic clutch device further comprises:
a spring receiving formation according to any one of claims 1 to 11; and
a plurality of coil springs attached to the housing space of the spring receiving structure, the plurality of coil springs applying a pressing force to the piston that moves the piston away from the clutch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120255980.5U CN214331292U (en) | 2021-01-29 | 2021-01-29 | Spring receiving structure and hydraulic clutch device provided with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120255980.5U CN214331292U (en) | 2021-01-29 | 2021-01-29 | Spring receiving structure and hydraulic clutch device provided with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214331292U true CN214331292U (en) | 2021-10-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120255980.5U Active CN214331292U (en) | 2021-01-29 | 2021-01-29 | Spring receiving structure and hydraulic clutch device provided with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214331292U (en) |
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2021
- 2021-01-29 CN CN202120255980.5U patent/CN214331292U/en active Active
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