CN212272985U - Friction transmission device and gear motor - Google Patents
Friction transmission device and gear motor Download PDFInfo
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- CN212272985U CN212272985U CN202020676151.XU CN202020676151U CN212272985U CN 212272985 U CN212272985 U CN 212272985U CN 202020676151 U CN202020676151 U CN 202020676151U CN 212272985 U CN212272985 U CN 212272985U
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- 230000002093 peripheral effect Effects 0.000 claims abstract description 22
- 238000000465 moulding Methods 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims 1
- 230000007423 decrease Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 101150091285 spx2 gene Proteins 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
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- 238000010276 construction Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
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- 239000002184 metal Substances 0.000 description 2
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Abstract
A friction transmission and a gear motor contribute to reduction of deviation of friction torque. The utility model discloses a friction drive includes: a shaft portion provided with a cylindrical portion extending in an axial direction at one end portion thereof, the cylindrical portion being radially deformable with an increased diameter; a gear portion including a friction ring fitted around the cylindrical portion and an external gear provided on an outer peripheral side of the friction ring; and a pin portion that is inserted into the cylindrical portion in an axial direction and deforms the cylindrical portion to expand in diameter, thereby bringing an outer peripheral surface of the cylindrical portion into frictional contact with an inner peripheral surface of the friction ring.
Description
Technical Field
The utility model relates to a friction transmission and including this friction transmission's gear motor.
Background
Conventionally, as shown in fig. 5, there is a friction transmission device including a rotating shaft 10X, and a first friction plate 20X, a gear 30X, and a second friction plate 40X that are fitted to the rotating shaft 10X in this order, the first friction plate 20X and the second friction plate 40X being fixed to the rotating shaft 10X so as to be unrotatable with respect to the rotating shaft 10X, and the gear 30X being rotatable together with the rotating shaft 10X by a frictional force between a first boss 31X and a second boss 32X provided on both end surfaces in an axial direction (extending direction of a rotation axis LX of the rotating shaft 10X) thereof, and the first friction plate 20X and the second friction plate 40X, while the gear 30X being rotatable with respect to the rotating shaft 10X when a force for rotating the rotating shaft 10X and the gear 30X in opposite directions is excessively large.
In the friction transmission device, in order to prevent the first friction plate 20X, the gear 30X, and the second friction plate 40X from coming off the rotating shaft 10X, the rotating shaft 10X is provided with the stepped portion SPX1 abutting against the first friction plate 20X from one axial side and the caulking portion SPX2 abutting against the second friction plate 40X from the other axial side, that is, in assembling, after the first friction plate 20X, the gear 30X, and the second friction plate 40X are sequentially fitted to the rotating shaft 10X and the first friction plate 20X is abutted against the stepped portion SPX1, the reserved portion on the rotating shaft 10X needs to be pressed by the caulking machine, and the caulking portion SPX2 abutting against the second friction plate 40X from the other axial side is formed. However, since the biasing force when the rivet SPX2 is formed by the rivet machine is difficult to control precisely, the frictional force between the first projections 31X and the second projections 32X and the first friction plates 20X and the second friction plates 40X is likely to vary due to variation in the biasing force of the rivet machine, and eventually, variation is likely to occur between the frictional torques of the plurality of manufactured friction transmission devices.
SUMMERY OF THE UTILITY MODEL
The present invention has been made in view of the above problems, and an object of the present invention is to provide a friction transmission device and a gear motor including the friction transmission device, which contribute to reducing the deviation of friction torque.
In order to achieve the above object, the present invention provides a friction transmission device, including: a shaft portion provided with a cylindrical portion extending in an axial direction at one end portion thereof, the cylindrical portion being radially deformable with an increased diameter; a gear portion including a friction ring fitted around the cylindrical portion and an external gear provided on an outer peripheral side of the friction ring; and a pin portion that is inserted into the cylindrical portion in an axial direction and deforms the cylindrical portion to expand in diameter, thereby bringing an outer peripheral surface of the cylindrical portion into frictional contact with an inner peripheral surface of the friction ring.
Here, "axial direction" refers to an extending direction of the rotation axis of the shaft portion, and "radial direction" refers to a radial direction centered on the rotation axis of the shaft portion.
According to the utility model discloses a friction transmission device, including axial region, gear portion and pin portion, the tube-shape portion of axial region is located to the friction ring cover of gear portion, and the pin portion inserts the tube-shape portion along the axial and makes this tube-shape portion hole enlargement warp to make the outer peripheral face of tube-shape portion and the inner peripheral surface frictional contact of friction ring. Therefore, the frictional force between the shaft portion and the gear portion is controlled by the outer diameter of the pin portion, and the outer diameter dimension of the pin portion is easily controlled, thereby contributing to reduction of variation in frictional torque between a plurality of friction transmission devices to be manufactured; in addition, unlike the case where four components, i.e., the rotating shaft, the first friction plate, the gear, and the second friction plate, need only be assembled, i.e., the shaft portion, the gear portion, and the pin portion, the number of components is reduced during assembly, which contributes to improvement in assembly efficiency; further, since the inner peripheral surface of the friction ring and the outer peripheral surface of the cylindrical portion constitute the frictional contact portion, the frictional contact area is easily increased as compared with the conventional case where the frictional contact portion is constituted by the first protrusion and the second protrusion, the first friction plate, and the second friction plate, and the maximum frictional torque of the friction transmission device is increased.
In the friction transmission device of the present invention, it is preferable that the shaft portion has a first stopper portion and a second stopper portion closer to the one end portion than the first stopper portion, and the first stopper portion and the second stopper portion abut against the friction ring from both axial sides.
According to the utility model discloses a friction transmission, the axial region has first spacing portion and leans on a spacing portion of second of a tip than this first spacing portion, first spacing portion with the spacing portion of second is from axial both sides and friction ring butt, consequently, can avoid gear portion to drop from the axial in friction transmission's work, improves friction transmission's job stabilization nature.
In the friction transmission device of the present invention, it is preferable that the shaft portion has a large diameter portion, the large diameter portion is located closer to the opposite side of the one end portion than the tubular portion, a diameter of the large diameter portion is larger than a diameter of the tubular portion, a step surface formed between the large diameter portion and the tubular portion constitutes the first stopper portion, a flange portion is provided at a position closer to the one end portion of the tubular portion, the flange portion constitutes the second stopper portion, and a side of the flange portion opposite to the large diameter portion is formed so that a diameter thereof decreases as the flange portion is farther away from the large diameter portion.
According to the friction transmission device of the present invention, the shaft portion has the large diameter portion, the large diameter portion is closer to the side opposite to the one end portion than the tubular portion, the diameter of the large diameter portion is larger than the diameter of the tubular portion, the step surface formed between the large diameter portion and the tubular portion constitutes the first limit portion, the flange portion is provided at the position closer to the one end portion of the tubular portion, and the flange portion constitutes the second limit portion, so that the first limit portion and the second limit portion can be formed with a simple structure, and the manufacturing difficulty is reduced; further, since the flange portion is formed so that the diameter thereof decreases as it goes away from the large diameter portion, the gear portion is easily fitted to the shaft portion from one end portion of the shaft portion, thereby improving the manufacturing efficiency.
In the friction transmission device according to the present invention, it is preferable that the cylindrical portion is formed in a cylindrical shape by a plurality of sheet-like portions which are arranged in a circumferential direction and which are elastically deformable in a radial direction.
Here, the "circumferential direction" refers to a circumferential direction around the rotation axis of the shaft portion.
According to the friction transmission device of the present invention, the cylindrical portion is constituted by the plurality of sheet-like portions which are arranged in the circumferential direction and which are elastically deformable in the radial direction, so that when the friction ring of the gear portion is fitted over the cylindrical portion of the shaft portion, the cylindrical portion can be easily reduced in diameter, and thus the friction ring can be easily fitted over the cylindrical portion; further, when the pin portion is inserted into the cylindrical portion in the axial direction to expand the diameter of the cylindrical portion, the cylindrical portion is less likely to be damaged by excessive stress, and the defective rate is likely to be reduced.
In the friction transmission device of the present invention, it is preferable that a rotation stopping structure is provided between the friction ring and the outer gear, and the rotation stopping structure prevents the outer gear from rotating relative to the friction ring.
According to the utility model discloses a friction transmission is provided with the structure of splining between friction ring and outer gear, and the structure of splining prevents that the outer gear rotates for the friction ring, consequently, can improve friction transmission's job stabilization nature.
Further, in the friction transmission device of the present invention, it is preferable that the rotation stopping structure includes: a recess provided in one of the friction ring and the external gear; and a convex portion provided on the other of the friction ring and the external gear and engaged with the concave portion.
According to the utility model discloses a friction transmission, the structure of splining includes: a recess provided in one of the friction ring and the external gear; and a convex portion provided on the other of the friction ring and the external gear and engaged with the concave portion, so that the rotation stop portion can be formed with a simple structure, thereby reducing the manufacturing difficulty.
In the friction transmission device according to the present invention, it is preferable that the concave portion and the convex portion are provided in plurality at equal angular intervals in the circumferential direction.
According to the utility model discloses a friction transmission, concave part and convex part are provided with a plurality ofly in the equal angle interval ground of week, consequently, can prevent the relative rotation of friction ring and external gear more reliably, improve friction transmission's job stabilization nature.
In the friction transmission device according to the present invention, it is preferable that the friction ring is located entirely within a length of the pin portion in the axial direction.
According to the utility model discloses a friction transmission, friction ring wholly is located the length range of pin portion in the axial, consequently, enables friction ring in the axial fully with the contact of tube-shape portion to improve friction transmission's maximum friction torque.
Further, in the friction transmission device of the present invention, it is preferable that the friction ring is made of rubber.
According to the utility model discloses a friction transmission, friction ring is made by rubber, consequently, improves friction transmission's maximum friction torque easily.
In the friction transmission device of the present invention, it is preferable that the friction ring and the external gear are formed integrally by insert molding.
In addition, in order to achieve the above object, the present invention provides a gear motor, including a motor portion and a gear set, the motor portion includes a motor shaft and a pinion portion provided on the motor shaft, the rotation of the motor shaft is transmitted to the gear set via the pinion, at least one gear of the gear set includes a rotation shaft and a transmission gear portion supported by the rotation shaft, wherein, including any one of the above friction transmission device, the motor shaft constitutes the shaft portion and the pinion portion constitutes the gear portion, and/or, the rotation shaft constitutes the shaft portion and the transmission gear portion constitutes the gear portion.
(effects of utility model)
According to the utility model discloses, friction transmission includes axial region, gear portion and pin portion, and the tube-shape portion of axial region is located to the friction ring cover of gear portion, and the pin portion inserts the tube-shape portion along the axial and makes this tube-shape portion hole enlargement warp to make the outer peripheral face of tube-shape portion and the inner peripheral surface frictional contact of friction ring. Therefore, the frictional force between the shaft portion and the gear portion is controlled by the outer diameter of the pin portion, and the outer diameter dimension of the pin portion is easily controlled, thereby contributing to reduction of variation in frictional torque between a plurality of friction transmission devices to be manufactured; in addition, unlike the case where four components, i.e., the rotating shaft, the first friction plate, the gear, and the second friction plate, need only be assembled, i.e., the shaft portion, the gear portion, and the pin portion, the number of components is reduced during assembly, which contributes to improvement in assembly efficiency; further, since the inner peripheral surface of the friction ring and the outer peripheral surface of the cylindrical portion constitute the frictional contact portion, the frictional contact area is easily increased as compared with the conventional case where the frictional contact portion is constituted by the first protrusion and the second protrusion, the first friction plate, and the second friction plate, and the maximum frictional torque of the friction transmission device is increased.
Drawings
Fig. 1 is a side sectional view schematically showing a friction transmission device according to an embodiment of the present invention.
Fig. 2 is a perspective view schematically showing a friction transmission device according to an embodiment of the present invention.
Fig. 3 is a front view schematically showing a friction transmission device according to an embodiment of the present invention.
Fig. 4 is an exploded perspective view schematically showing a friction transmission device according to an embodiment of the present invention.
Fig. 5 is a partial side sectional view schematically showing a conventional friction drive device.
(symbol description)
1 Friction drive
10 shaft part
10a one end part of the shaft part
10b the other end of the shaft portion
11 cylindrical part
11a sheet part
111 flange part
12 big diameter part
13 step surface
20 gear part
21 friction ring
211 convex part
22 external gear
221 recess
30 pin part
SP1 first limit part
SP2 second limit part
SS rotation stopping structure
V-shaped notch part
L axis of rotation
Detailed Description
Next, a friction transmission device according to an embodiment of the present invention will be described with reference to fig. 1 to 4, wherein fig. 1 is a side sectional view schematically showing a friction transmission device according to an embodiment of the present invention, fig. 2 is a perspective view schematically showing a friction transmission device according to an embodiment of the present invention, fig. 3 is a front view schematically showing a friction transmission device according to an embodiment of the present invention, and fig. 4 is an exploded perspective view schematically showing a friction transmission device according to an embodiment of the present invention.
(integral construction of Friction Transmission device)
As shown in fig. 1, the friction drive device 1 includes: a shaft portion 10 having a cylindrical portion 11 extending in an axial direction (i.e., in an extending direction of a rotation axis L of the shaft portion 10) provided at one end portion 10a of the shaft portion 10, the cylindrical portion 11 being deformable in a radial direction with an increased diameter; a gear portion 20, the gear portion 20 including a friction ring 21 and an external gear 22, the friction ring 21 being fitted to the cylindrical portion 11, the external gear 22 being provided on an outer peripheral side of the friction ring 21; and a pin portion 30 that is inserted into the cylindrical portion 11 in the axial direction (i.e., the direction in which the rotation axis L of the shaft portion 10 extends) and that expands the diameter of the cylindrical portion 11, thereby bringing the outer peripheral surface of the cylindrical portion 11 into frictional contact with the inner peripheral surface of the friction ring 21.
(Structure of shaft portion)
As described above, the shaft portion 10 has the cylindrical portion 11.
The shaft 10 is made of, for example, resin.
As shown in fig. 1, the shaft portion 10 includes a first stopper portion SP1 and a second stopper portion SP2 located closer to the one end 10a than the first stopper portion SP1, and the first stopper portion SP1 and the second stopper portion SP2 abut the friction ring 21 from both sides in the axial direction.
Specifically, the shaft portion 10 has a large diameter portion 12, and the large diameter portion 12 is located on the opposite side of the one end portion 10a (i.e., on the other end portion 10b side of the shaft portion 10) from the cylindrical portion 11; the diameter of the large diameter portion 12 is larger than that of the cylindrical portion 11, and a stepped surface 13 formed between the large diameter portion 12 and the cylindrical portion 11 constitutes a first stopper SP 1; a flange portion 111 is provided near the one end portion 10a of the cylindrical portion 11, and the flange portion 111 constitutes a second stopper SP 2; the side (lower side in fig. 1) of the flange portion 111 opposite to the large diameter portion 12 is formed so as to decrease in diameter as being apart from the large diameter portion 12 in the axial direction.
Further, as shown in fig. 4, the cylindrical portion 11 is formed in a cylindrical shape by a plurality of sheet-like portions 11a (that is, the cylindrical portion 11 has a plurality of slits cut from one end portion 10a toward the other end portion 10b of the shaft portion 10), and the plurality of sheet-like portions 11a are arranged in the circumferential direction and are elastically deformable in the radial direction (in the illustrated example, the cylindrical portion 11 is formed by four sheet-like portions 11a, and the four sheet-like portions 11a are arranged at equal angular intervals in the circumferential direction and are elastically deformable in the radial direction, but the present invention is not limited thereto).
As shown in fig. 1 and 4, the other end 10b of the shaft portion 10 is provided with a notch V formed by cutting from an end surface of the other end 10 toward the one end 10a in the axial direction.
(Structure of gear portion)
As described above, the gear portion 20 includes the friction ring 21 and the external gear 22.
Further, the friction ring 21 is made of, for example, rubber; also, the external gear 22 is made of, for example, metal.
Further, the friction ring 21 and the external gear 22 are formed integrally by, for example, insert molding.
Further, as shown in fig. 1 to 4, a rotation stop structure SS is provided between the friction ring 21 and the external gears 22, and the rotation stop structure SS prevents the external gears 22 from rotating relative to the friction ring 21.
Specifically, the rotation stop structure SS includes: a recess 221 provided in one of the friction ring 21 and the external gear 22; and a convex portion 211 that is provided on the other of the friction ring 21 and the external gear 22 and that engages with the concave portion 221 (in the illustrated example, the concave portion 221 is provided on the external gear 22 and the convex portion 211 is provided on the friction ring 21, but the present invention is not limited thereto). The plurality of concave portions 221 and the plurality of convex portions 211 are provided at equal angular intervals in the circumferential direction (in the illustrated example, four concave portions 221 and four convex portions 211 are provided at equal angular intervals in the circumferential direction, but the present invention is not limited thereto).
(construction of Pin part)
As shown in fig. 1, the pin portion 30 is inserted into the cylindrical portion 11 so as to extend in the axial direction.
Furthermore, the pin portion is made of metal, for example.
Further, as shown in fig. 1 to 4, since both ends of the pin portion 30 are provided with chamfered portions, the pin portion 30 can be easily inserted into the tubular portion 11.
As shown in fig. 1, the friction ring 21 is located entirely within the length of the pin portion 30 in the axial direction (in the illustrated example, the upper end surface of the friction ring 21 is flush with the upper end portion of the pin portion 30, and the lower end surface of the friction ring 21 is located above the lower end portion of the pin portion 30, but the present invention is not limited thereto).
(an example of the operation of the friction drive device)
For example, when the shaft portion 10 is rotated in one direction, if the frictional force between the shaft portion 10 and the gear portion 20 is larger than an external force to keep the gear portion 20 stationary or rotate the gear portion 20 in the other direction, the gear portion 20 rotates together with the shaft portion 10; on the other hand, if the frictional force between the shaft portion 10 and the gear portion 20 is smaller than the external force to keep the gear portion 20 stationary or rotate the gear portion 20 in the other direction, the gear portion 20 rotates with respect to the shaft portion 10.
(main effect of the present embodiment)
According to the friction transmission device 1 of the present embodiment, the shaft portion 10, the gear portion 20 and the pin portion 30 are provided, the friction ring 21 of the gear portion 20 is fitted to the cylindrical portion 11 of the shaft portion 10, and the pin portion 30 is inserted into the cylindrical portion 11 in the axial direction to deform the cylindrical portion 11 so as to expand the diameter, thereby bringing the outer circumferential surface of the cylindrical portion 11 into frictional contact with the inner circumferential surface of the friction ring 21, so that the frictional force between the shaft portion 10 and the gear portion 20 is controlled by the outer diameter of the pin portion 30, and the outer diameter dimension of the pin portion 30 is easily controlled, thereby contributing to reduction of the variation in the frictional torque between a plurality of friction transmission devices to be manufactured; further, unlike the case where it is necessary to assemble four members of the rotating shaft, the first friction plate, the gear, and the second friction plate in the related art, only three members of the shaft portion 10, the gear portion 20, and the pin portion 30 need to be assembled, and the number of members at the time of assembly is reduced, which contributes to improvement of assembly efficiency; further, since the inner peripheral surface of the friction ring 21 and the outer peripheral surface of the cylindrical portion 11 constitute a frictional contact portion, it is easy to increase the frictional contact area and increase the maximum frictional torque of the friction transmission device, as compared with the conventional case where the frictional contact portion is constituted by the first protrusions and the second protrusions, and the first friction plates and the second friction plates.
Further, according to the friction transmission device 1 of the present embodiment, the cylindrical portion 11 of the shaft portion 10 is constituted by the plurality of sheet-like portions 11a, and the plurality of sheet-like portions 11a are arranged in the circumferential direction and are elastically deformable in the radial direction, so when the friction ring 21 of the gear portion 20 is fitted to the cylindrical portion 11 of the shaft portion 10, the cylindrical portion 11 can be easily reduced in diameter, and therefore the friction ring 21 is easily fitted to the cylindrical portion 11; further, when the pin portion 30 is inserted into the cylindrical portion 11 in the axial direction to expand the diameter of the cylindrical portion 11, the cylindrical portion 11 is less likely to be damaged by excessive stress, and the defective rate is likely to be reduced.
Further, according to the friction transmission device 1 of the present embodiment, since the friction ring 21 is located within the length range of the pin portion 30 as a whole in the axial direction, the friction ring 21 can be brought into sufficient contact with the cylindrical portion 11 in the axial direction, and the maximum friction torque of the friction transmission device can be increased.
(application example of Friction Transmission device)
The friction transmission device 1 of the present embodiment is applicable to, for example, a gear motor.
Specifically, the gear motor includes a motor portion and a gear set, wherein the motor portion includes a motor shaft and a pinion portion provided on the motor shaft, rotation of the motor shaft is transmitted to the gear set via the pinion, at least one gear of the gear set includes a rotation shaft and a transmission gear portion supported by the rotation shaft, and the motor shaft constitutes a shaft portion of the friction transmission device and the pinion portion constitutes a gear portion of the friction transmission device, and/or the rotation shaft constitutes a shaft portion of the friction transmission device and the transmission gear portion constitutes a gear portion of the friction transmission device.
The present invention has been described above by way of example with reference to the accompanying drawings, and it is to be understood that the specific implementations of the present invention are not limited to the above-described embodiments.
For example, in the above embodiment, the materials of the shaft portion 10, the gear portion 20, and the pin portion 30 may be appropriately selected as necessary.
Further, in the above embodiment, the cylindrical portion 11 is constituted by the plurality of sheet-like portions 11a, but is not limited to this, and the cylindrical portion 11 may be constituted by one portion continuous in the circumferential direction in some cases.
In the above embodiment, the cylindrical portion 11 is formed in a cylindrical shape by the plurality of sheet portions 11a, but the cylindrical portion 11 is not limited to a cylindrical shape.
In the above embodiment, the cylindrical portion 11 may be formed so as to be elastically deformable in the radial direction and to be expanded in diameter, or the cylindrical portion 11 may be formed so as to be plastically deformable in the radial direction and to be expanded in diameter.
Further, in the above-described embodiment, the friction ring 21 and the external gear 22 are formed integrally by, for example, insert molding, but not limited thereto, and the friction ring 21 and the external gear 22 may be fixed together by caulking.
In the above embodiment, the shaft portion 10 has the first stopper portion SP1 and the second stopper portion SP2 closer to the one end 10a than the first stopper portion SP1, but the present invention is not limited to this, and the second stopper portion SP2 may be omitted or both the first stopper portion SP1 and the second stopper portion SP2 may be omitted depending on the case.
In the above embodiment, the friction ring 21 is located entirely within the length of the pin portion 30 in the axial direction, but the present invention is not limited to this, and the friction ring 21 and the pin portion 30 may partially overlap in the axial direction.
It should be understood that the present invention can freely combine the respective components in the embodiments or appropriately change or omit the respective components in the embodiments within the scope thereof.
Claims (10)
1. A friction drive device, comprising:
a shaft portion provided with a cylindrical portion extending in an axial direction at one end portion thereof, the cylindrical portion being radially deformable with an increased diameter;
a gear portion including a friction ring fitted around the cylindrical portion and an external gear provided on an outer peripheral side of the friction ring; and
and a pin portion that is inserted into the cylindrical portion in an axial direction and deforms the cylindrical portion to expand in diameter, thereby bringing an outer peripheral surface of the cylindrical portion into frictional contact with an inner peripheral surface of the friction ring.
2. The friction drive as recited in claim 1 wherein,
the shaft portion has a first stopper portion and a second stopper portion closer to the one end portion than the first stopper portion,
the first limiting portion and the second limiting portion are abutted with the friction ring from two axial sides.
3. The friction drive as recited in claim 2 wherein,
the shaft portion has a large-diameter portion,
the large diameter portion is located on the opposite side of the one end portion with respect to the cylindrical portion,
the diameter of the large diameter portion is larger than the diameter of the cylindrical portion,
a stepped surface formed between the large diameter portion and the cylindrical portion constitutes the first stopper portion,
a flange portion is provided at a position closer to the one end portion of the cylindrical portion,
the flange portion constitutes the second stopper portion,
the flange portion is formed to have a diameter decreasing as it is farther from the large diameter portion on a side opposite to the large diameter portion.
4. A friction drive according to any one of claims 1 to 3,
the cylindrical portion is formed in a cylindrical shape by a plurality of sheet portions,
the plurality of sheet-like portions are arranged in the circumferential direction and are elastically deformable in the radial direction.
5. The friction drive as recited in claim 1 wherein,
a rotation stopping structure is arranged between the friction ring and the outer gear,
the rotation stopping structure prevents the outer gear from rotating relative to the friction ring.
6. Friction drive according to claim 5 wherein,
the rotation stopping structure comprises:
a recess provided in one of the friction ring and the external gear; and
and a convex portion provided on the other of the friction ring and the external gear and engaged with the concave portion.
7. The friction drive as recited in claim 1 wherein,
the friction ring is located axially over the entire length of the pin.
8. The friction drive as recited in claim 1 wherein,
the friction ring is made of rubber.
9. The friction drive as recited in claim 1 wherein,
the friction ring and the outer gear are formed integrally by insert molding.
10. A gear motor comprising a motor part and a gear set, the motor part comprising a motor shaft and a pinion part provided on the motor shaft, the rotation of the motor shaft being transmitted to the gear set via the pinion, at least one gear of the gear set comprising a rotary shaft and a transmission gear part supported by the rotary shaft, characterized in that,
comprising a friction drive according to one of claims 1 to 9,
the motor shaft constitutes the shaft portion and the pinion portion constitutes the gear portion, and/or the rotating shaft constitutes the shaft portion and the transmission gear portion constitutes the gear portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020676151.XU CN212272985U (en) | 2020-04-28 | 2020-04-28 | Friction transmission device and gear motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020676151.XU CN212272985U (en) | 2020-04-28 | 2020-04-28 | Friction transmission device and gear motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212272985U true CN212272985U (en) | 2021-01-01 |
Family
ID=73885553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020676151.XU Active CN212272985U (en) | 2020-04-28 | 2020-04-28 | Friction transmission device and gear motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212272985U (en) |
-
2020
- 2020-04-28 CN CN202020676151.XU patent/CN212272985U/en active Active
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