CN215370680U - Friction transmission device and motor device - Google Patents
Friction transmission device and motor device Download PDFInfo
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- CN215370680U CN215370680U CN202121083239.1U CN202121083239U CN215370680U CN 215370680 U CN215370680 U CN 215370680U CN 202121083239 U CN202121083239 U CN 202121083239U CN 215370680 U CN215370680 U CN 215370680U
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- gear
- axial direction
- rotating shaft
- leaf spring
- washer
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- 230000005540 biological transmission Effects 0.000 title claims description 46
- 230000002093 peripheral effect Effects 0.000 claims abstract description 65
- 239000002184 metal Substances 0.000 claims description 13
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims 1
- 230000033001 locomotion Effects 0.000 abstract description 10
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Abstract
A friction drive and a motor device including the friction drive contribute to increase a friction torque for transmitting a rotational motion between a rotating shaft and a gear. The friction drive device of the present invention includes: the rotating shaft is provided with a first pressing part and a second pressing part; the gear is sleeved on the rotating shaft in a rotatable manner; and a washer and a leaf spring, the washer and the leaf spring are respectively sleeved on the rotating shaft in a non-rotatable manner, the washer is pressed by the first pressing part to abut against the gear from a first side in the axial direction, the leaf spring is pressed by the second pressing part to abut against the gear from a second side in the axial direction, wherein the gear is provided with a first plane part for the washer to abut against from the first side in a surface contact manner, the leaf spring is provided with an inner peripheral part, an outer peripheral part and a connecting part, the inner peripheral part is pressed by the second pressing part from the second side, the outer peripheral part is positioned on the outer peripheral side of the inner peripheral part and abuts against the gear from the second side, and the connecting part bends and extends to the outer peripheral part from the inner peripheral part.
Description
Technical Field
The present invention relates to a friction transmission device and a motor device including the friction transmission device.
Background
Conventionally, there is a friction transmission device, as shown in fig. 7, including: a rotating shaft 110X, wherein the rotating shaft 110X is provided with a first pressing part 111X and a second pressing part 112X; the gear 120X is sleeved on the rotating shaft 110X in a rotatable manner; the washer 130X and the leaf spring 140X are respectively fitted to the rotating shaft 110X so as to be non-rotatable, the washer 130X is pressed by the first pressing portion 121X to abut against the gear 120X from a first side (upper side in fig. 7) in the axial direction (vertical direction in fig. 7), and the leaf spring 140X is pressed by the second pressing portion 112X to abut against the gear 120X from a second side (lower side in fig. 7) in the axial direction.
Further, in the above-described friction transmission device, as shown in fig. 7, the gear 120X has: a first protrusion 121X, where the first protrusion 121X is disposed on an end surface of the first side of the gear 120X in the axial direction, and a portion, to which the washer 130X abuts, is an arc surface; the second protrusion 122X is provided on an end surface of a second side of the gear 120X in the axial direction, and a portion of the gear against which the leaf spring 140X abuts is a plane; the leaf spring 140 has a flat plate shape whose thickness direction coincides with the axial direction.
In the above-described friction transmission device, the gear 120X can rotate together with the rotation shaft 110X by the frictional force between the first protrusion 121X and the washer 130X and the frictional force between the second protrusion 122X and the leaf spring 140X in a normal state, and on the other hand, the gear 120X can rotate with respect to the rotation shaft 110X when the force for rotating the rotation shaft 110X and the gear 120X in the opposite direction is excessively large.
However, in the above-described friction transmission device, it is sometimes necessary to further increase the frictional force between the washer 130X, the leaf spring 140X, and the gear 120X, thereby increasing the frictional torque for transmitting the rotational motion between the rotary shaft 110X and the gear 120X.
SUMMERY OF THE UTILITY MODEL
The present invention has been made in view of the above problems, and an object thereof is to provide a friction transmission device and a motor device including the friction transmission device, which contribute to an increase in friction torque for transmitting rotational motion between a rotating shaft and a gear.
In order to achieve the above object, the present invention provides a friction drive device including: the rotating shaft is provided with a first pressing part and a second pressing part; the gear is sleeved on the rotating shaft in a rotatable mode; and a washer and a leaf spring that are respectively fitted around the rotating shaft so as to be non-rotatable, the washer being pressed by the first pressing portion so as to abut against the gear from a first side in the axial direction, the leaf spring being pressed by the second pressing portion so as to abut against the gear from a second side in the axial direction, wherein the gear has a first flat surface portion with which the washer abuts in a surface contact manner from the first side, the leaf spring has an inner peripheral portion, an outer peripheral portion, and a connecting portion, the inner peripheral portion is pressed by the second pressing portion from the second side, the outer peripheral portion is located on the outer peripheral side of the inner peripheral portion and abuts against the gear from the second side, and the connecting portion extends from the inner peripheral portion to the outer peripheral portion in a bent manner.
Here, the "axial direction", "inner peripheral portion" and "outer peripheral portion" are based on the rotation center line of the rotating shaft.
According to the friction transmission device of the present invention, the gear has the first flat surface portion with which the washer is brought into surface contact from the first side in the axial direction, and the leaf spring has the inner circumferential portion, the outer circumferential portion, and the connecting portion, the inner circumferential portion is pressed by the second pressing portion from the second side in the axial direction, the outer circumferential portion is positioned on the outer circumferential side of the inner circumferential portion, and the connecting portion is brought into contact with the gear from the second side in the axial direction, and the connecting portion is bent and extended from the inner circumferential portion to the outer circumferential portion.
In the friction transmission device according to the present invention, it is preferable that a radial middle portion of a portion located on one side with respect to a rotation center line of the rotation shaft is formed in a shape protruding toward the second side in a cross section of the leaf spring cut in the axial direction.
Here, the "radial direction" is based on the rotation center line of the rotation shaft.
In the friction transmission device according to the present invention, it is preferable that the inner circumferential portion and the outer circumferential portion at least partially overlap in the axial direction.
According to the friction transmission device of the present invention, since the inner circumferential portion and the outer circumferential portion are at least partially overlapped in the axial direction, the leaf spring and the gear can be arranged more compactly in the axial direction, and the contact force between the leaf spring and the gear can be easily increased, thereby increasing the friction torque for transmitting the rotational motion between the rotating shaft and the gear.
Further, in the friction drive device of the present invention, it is preferable that the first flat surface portion is formed annularly around the rotation shaft.
According to the friction transmission device of the present invention, the first flat surface portion is formed annularly around the rotating shaft, and therefore, it is easy to increase the contact area between the washer and the first flat surface portion of the gear, thereby improving the friction torque for transmitting the rotational motion between the rotating shaft and the gear.
Further, in the friction transmission device of the present invention, it is preferable that the surface of the first side of the gear has a first recessed portion which extends from the first flat surface portion toward an inner peripheral side and is separated from the washer in an axial direction.
According to the friction transmission device of the present invention, the surface of the first side of the gear has the first recessed portion which extends from the first flat surface portion toward the inner peripheral side and is separated from the washer in the axial direction, and therefore, sufficient surface contact of the washer with the first flat surface portion is easily ensured, the contact area between the washer and the first flat surface portion of the gear is increased, and the friction torque for transmitting the rotational motion between the rotating shaft and the gear is increased.
In the friction transmission device according to the present invention, it is preferable that the gear has a second flat surface portion against which the outer peripheral portion is brought into surface contact from the second side.
According to the friction transmission device of the present invention, since the gear has the second flat surface portion with which the outer peripheral portion is brought into surface contact from the second side, the contact area between the leaf spring and the second flat surface portion of the gear is easily increased, and the friction torque for transmitting the rotational motion between the rotating shaft and the gear is increased.
In the friction transmission device according to the present invention, it is preferable that the first pressing portion is a first stepped portion formed on the rotating shaft, and the second pressing portion is a caulking portion formed by pressing the rotating shaft.
In the friction transmission device according to the present invention, it is preferable that a stopper portion that is a second stepped portion formed on the rotating shaft and limits a range of movement of the inner peripheral portion toward the first side is formed between the first pressing portion and the second pressing portion.
In the friction transmission device according to the present invention, it is preferable that the rotating shaft is made of metal, the gear is made of resin, the washer is made of metal, and the leaf spring is made of metal.
Further, in order to achieve the above object, the present invention provides a motor device including a motor portion and a gear train, wherein the friction transmission device described in any one of the above is included, and a driving force of the motor portion is transmitted to the gear of the friction transmission device via the gear train to rotate the rotating shaft of the friction transmission device.
(effects of utility model)
According to the present invention, since the gear has the first flat surface portion with which the washer is brought into surface contact from the first side in the axial direction, and the leaf spring has the inner circumferential portion which is pressed from the second side in the axial direction by the second pressing portion, the outer circumferential portion which is located on the outer circumferential side of the inner circumferential portion and which is brought into contact with the gear from the second side in the axial direction, and the connecting portion which is bent and extended from the inner circumferential portion to the outer circumferential portion, the frictional force between the gear and the washer, the leaf spring is increased, and the frictional torque transmitting the rotational motion between the rotating shaft and the gear is easily increased, as compared with the case where the portion of the gear with which the washer is brought into contact is a curved surface and the leaf spring is in a flat plate shape whose thickness direction coincides with the axial direction.
Drawings
Fig. 1 is a perspective view schematically showing a motor device according to an embodiment of the present invention.
Fig. 2 is a perspective view schematically showing a motor apparatus according to an embodiment of the present invention, in which illustration of a cover plate is omitted.
Fig. 3 is a side sectional view schematically showing a motor device according to an embodiment of the present invention.
Fig. 4 is a sectional perspective view schematically showing a friction transmission device in the motor device according to the embodiment of the present invention.
Fig. 5 is a side sectional view schematically showing a friction transmission device in a motor device according to an embodiment of the present invention.
Fig. 6 is an exploded perspective view schematically showing a friction transmission device in a motor device according to an embodiment of the present invention, in which a bearing supporting a rotating shaft of the motor device is also shown.
Fig. 7 is a partial side sectional view schematically showing a conventional friction drive device.
(symbol description)
1 Motor device
10 friction drive
110 rotating shaft
111 first pressing part
112 second pressing part
113 position limiter
120 gear
121 first plane part
122 first recess
125 second plane part
126 second recess
129 through hole
130 washer
131 through hole
140 leaf spring
141 inner peripheral portion
142 outer peripheral portion
143 connecting part
145 through hole
20 motor part
21 stator
22 rotor
30 gear set
90 outer casing
91 bottomed tubular part
92 cover plate
SH1 large diameter part
SH2 first middle diameter part
SH3 second middle diameter part
SH4 small diameter part
GR1 cylindrical part
GR2 plate-shaped part
BR bearing
Detailed Description
Next, a motor device according to an embodiment of the present invention will be described with reference to fig. 1 to 6, in which fig. 1 schematically shows a perspective view of the motor device according to the embodiment of the present invention, fig. 2 is a perspective view schematically showing the motor device according to the embodiment of the present invention, in which a cover plate is not shown, fig. 3 is a side sectional view schematically showing the motor device according to the embodiment of the present invention, fig. 4 is a sectional perspective view schematically showing a friction transmission device in the motor device according to the embodiment of the present invention, fig. 5 is a side sectional view schematically showing the friction transmission device in the motor device according to the embodiment of the present invention, and fig. 6 is an exploded perspective view schematically showing the friction transmission device in the motor device according to the embodiment of the present invention, and a bearing for supporting a rotating shaft of the motor device is also shown.
Here, it is assumed that the extending direction of the rotation center line of the rotation shaft of the friction transmission device, that is, the axial direction coincides with the Z direction, and that the first side in the axial direction coincides with the Z1 direction side and the second side in the axial direction coincides with the Z2 direction side.
(integral Structure of Motor device)
As shown in fig. 1 to 3, the motor device 1 includes a friction transmission device 10, a motor part 20, and a gear set 30, wherein the friction transmission device 10 has a rotation shaft 110 and a gear 120, and a driving force of the motor part 20 is transmitted to the gear 120 of the friction transmission device 10 via the gear set 30, thereby rotating the rotation shaft 110 of the friction transmission device 10 by a friction torque.
As shown in fig. 1 to 3, the motor device 1 includes a housing 90, the housing 90 includes a bottomed cylinder 91 and a cover plate 92 that closes an opening of the bottomed cylinder 91, a main body of the friction transmission device 10, the motor unit 20, and the gear train 30 are housed in a housing space surrounded by the bottomed cylinder 91 and the cover plate 92, a rotating shaft 110 of the friction transmission device 10 constitutes an output shaft of the motor device 1, and a part of the rotating shaft 110 protrudes from the housing space of the housing 90 to the outside through a through hole of the cover plate 92 for connection to an external device.
(Structure of Friction Transmission device)
As shown in fig. 4 to 6, the friction drive device 10 includes: the rotating shaft 110, the rotating shaft 110 is provided with a first pressing part 111 and a second pressing part 112; a gear 120, wherein the gear 120 is rotatably sleeved on the rotating shaft 110; and a washer 130 and a leaf spring 140, the washer 130 and the leaf spring 140 being respectively fitted to the rotary shaft 110 so as to be non-rotatable, the washer 130 being pressed by the first pressing portion 111 to abut against the gear 120 from a first side in the axial direction (the Z1 direction side in the illustrated example), and the leaf spring 140 being pressed by the second pressing portion 112 to abut against the gear 120 from a second side in the axial direction (the Z2 direction side in the illustrated example). As shown in fig. 4 to 6, the gear 120 has a first flat surface portion 121 against which the washer 130 is brought into surface contact from a first side in the axial direction, the leaf spring 140 has an inner circumferential portion 141, an outer circumferential portion 142, and a connecting portion 143, the inner circumferential portion 141 is pressed from a second side in the axial direction by the second pressing portion 112, the outer circumferential portion 142 is located on the outer circumferential side of the inner circumferential portion 141 and is brought into contact with the gear 120 from the second side in the axial direction, and the connecting portion 143 extends from the inner circumferential portion 141 to the outer circumferential portion 142 while being bent.
Here, as shown in fig. 4 to 6, in the rotating shaft 110, the first pressing portion 111 is a first stepped portion formed on the rotating shaft 110, and the second pressing portion 112 is located on a second side in the axial direction of the first pressing portion 111 and is a caulking portion formed by pressing the rotating shaft 110; a stopper 113 is formed between the first pressing part 111 and the second pressing part 112, and the stopper 113 is a second stepped part formed on the rotating shaft 110 and limits a range in which the inner peripheral part 141 of the leaf spring 140 moves to the first side in the axial direction. Specifically, the rotating shaft 110 is a stepped shaft made of metal, and includes a large-diameter portion SH1, a first intermediate-diameter portion SH2, a second intermediate-diameter portion SH3, and a small-diameter portion SH4, which are arranged in this order in the axial direction, wherein the large-diameter portion SH1 is rotatably supported by a cover plate 92 (see fig. 3) of the housing 90 via a bearing BR, the first intermediate-diameter portion SH2 is located on a second side in the axial direction of the large-diameter portion SH1 and has a smaller diameter than the large-diameter portion SH1, the second intermediate-diameter portion SH3 is located on a second side in the axial direction of the first intermediate-diameter portion SH2 and has a smaller diameter than the first intermediate-diameter portion SH2, and the small-diameter portion SH4 is located on a second side in the axial direction of the second intermediate-diameter portion SH3 and is supported by the housing 90 or a support member fixed in the housing 90 (see fig. 3) and has a smaller diameter than the second intermediate-diameter portion SH 3; a notch formed by cutting out a part of the large diameter portion SH1 in the circumferential direction is provided at the end portion of the large diameter portion SH1 on the first side in the axial direction; also, a part of the first intermediate diameter portion SH2 in the circumferential direction is cut out to form a non-circular cross section; a stepped portion constituting the first pressing portion 111 is formed at a boundary between the large diameter portion SH1 and the first intermediate diameter portion SH2, a groove around the rotating shaft 110 is formed at an end portion of the first intermediate diameter portion SH2 close to the second intermediate diameter portion SH3, a sidewall of a second side of the groove in the axial direction constitutes the second pressing portion 112, and a sidewall of a first side of the groove in the axial direction constitutes the stopper portion 113.
Further, as shown in fig. 4 to 6, in the gear 120, the first plane portion 121 is formed on the surface of the first side in the axial direction of the gear 120, and is formed annularly around the rotating shaft 110; also, the surface of the first side in the axial direction of the gear 120 has a first recessed portion 122, the first recessed portion 122 extending from the first flat portion 121 toward the inner peripheral side and being separated from the washer 130 in the axial direction; the gear 120 further includes a second flat surface 125 against which the outer peripheral portion 142 of the leaf spring 140 is brought into surface contact from a second side in the axial direction; also, the surface of the second side in the axial direction of the gear 120 has a second recessed portion 126, and the second recessed portion 126 extends from the second flat portion 125 toward the inner peripheral side, and is separated from the washer 130 in the axial direction. Specifically, the gear 120 is made of resin and includes a cylindrical portion GR1 and a plate-shaped portion GR2, in which the cylindrical portion GR1 extends in the axial direction, gear teeth are formed on the outer peripheral surface of the cylindrical portion GR1, the plate-shaped portion GR2 extends from the center in the axial direction of the cylindrical portion GR1 toward the inner peripheral side, the thickness direction coincides with the axial direction, and a through hole 129 through which the rotating shaft 110 passes is provided at the center of the plate-shaped portion GR 2; further, the first flat surface portion 121 and the first recessed portion 122 are respectively provided on a first side in the axial direction of the plate-shaped portion GR1, the first recessed portion 122 is recessed toward a second side in the axial direction with respect to the first flat surface portion 121 and extends to the through hole 129, the second flat surface portion 125 and the second recessed portion 126 are respectively provided on a second side in the axial direction of the plate-shaped portion GR1, and the second recessed portion 126 is recessed toward the first side in the axial direction with respect to the second flat surface portion 125 and extends to the through hole 129; the first flat portion 121, the first recessed portion 122, the second flat portion 125, and the second recessed portion 126 are continuous rings around the rotation center line of the rotation shaft 110.
As shown in fig. 4 to 6, the washer 130 is formed in a plate shape as a whole, and the thickness direction thereof coincides with the axial direction. Specifically, the washer 130 is made of metal, the outer peripheral edge of the washer 130 is in surface contact with the first flat surface portion 121 of the gear 120 from the first side in the axial direction, a non-circular through hole 131 is provided in the center of the washer 130, the through hole 131 is penetrated by a first intermediate diameter portion P2 having a non-circular cross section of the rotating shaft 110 so that the washer 130 cannot rotate relative to the rotating shaft 110, and the first pressing portion 111 of the rotating shaft 110 presses the peripheral edge portion of the through hole 131 from the first side in the axial direction.
As shown in fig. 4 to 6, the leaf spring 140 is generally disk-shaped as a whole. Specifically, the leaf spring 140 is made of metal, and in a cross section of the leaf spring 140 cut in the axial direction, a radial middle portion of a portion located on one side (for example, the left side or the right side in fig. 5) with respect to the rotation center line of the rotation shaft 110 has a shape protruding toward the second side in the axial direction (in the illustrated example, substantially 7-shaped). Further, in the leaf spring 140, when the second pressing portion 112 is formed by press working the rotary shaft 110, the inner peripheral portion 141 is displaced from the second side in the axial direction toward the first side in the axial direction by a force from the second pressing portion 112, and the leaf spring 140 is elastically deformed so that the inner peripheral portion 141 overlaps at least partially (i.e., is positioned at the same position in the axial direction) with the outer peripheral portion 142 in the axial direction, and the outer peripheral portion is positioned on the outer peripheral side of the inner peripheral portion 141 and is in surface contact with the second flat surface portion 125 of the gear 120; a non-circular through hole 145 is provided at the center of the leaf spring 140, and the second intermediate-diameter portion P3 having a non-circular cross section of the rotation shaft 110 is inserted through the through hole 145 to prevent the leaf spring 140 from rotating with respect to the rotation shaft 110.
(Structure of Motor section)
As shown in fig. 2 and 3, the motor portion 20 has a stator 21 and a rotor 22, wherein the rotor 22 is rotatable with respect to the stator 21.
Here, the stator 21 is fixed to the housing 90, and includes a stator core and a coil; the rotor 22 is provided on the inner peripheral side of the stator 21, and faces the stator with a gap therebetween on the inner peripheral side. Specifically, as shown in fig. 3, the rotor 22 is supported by support shafts supported at both ends by the housing 90 so as to be rotatable about an axis extending in the axial direction, and a pinion gear portion is formed on a first side in the axial direction of a rotor body included in the rotor 22.
(Structure of Gear train)
As shown in fig. 2 and 3, the gear set 30 includes a plurality of gears.
Here, the gear train 30 is a reduction gear train, and in the gear train 30, a plurality of gears are supported by support shafts supported by the housing 90 at both ends so as to be rotatable about axes extending in the axial direction. Specifically, as shown in fig. 3, among the plurality of gears included in the gear train 30, the most upstream gear is engaged with the pinion gear portion of the rotor 22, and the most downstream gear is engaged with the gear 120 of the friction transmission device 10, whereby the rotational driving force of the motor portion 20 is transmitted to the gear 120 of the friction transmission device 10 to rotate the rotation shaft 110.
(main effect of the present embodiment)
According to the motor device 1 of the present embodiment, in the friction transmission device 10 including the rotating shaft 110, the gear 120, the washer 130, and the leaf spring 140, the gear 120 has the first flat surface portion 121 with which the washer 130 is brought into surface contact from the first side in the axial direction (the Z1 direction side), and the leaf spring 140 has the inner peripheral portion 141, the outer peripheral portion 142, and the connecting portion 143, the inner peripheral portion 141 is pressed from the second side in the axial direction (the Z2 direction side) by the second pressing portion 112 provided in the rotating shaft 110, the outer peripheral portion 142 is located on the outer peripheral side of the inner peripheral portion 141, and the second side in the axial direction is brought into contact with the gear 120, and the connecting portion 143 is bent and extended from the inner peripheral portion 141 to the outer peripheral portion 142, and therefore, the portion with which the washer 130 of the gear 120 is brought into contact is an arc surface, and the leaf spring 140 is in a flat plate shape in which the thickness direction coincides with the axial direction, it contributes to increasing the frictional force between the gear 120 and the washer 130, the leaf spring 140, this makes it easy to increase the friction torque for transmitting the rotational motion between the rotary shaft 110 and the gear 120.
The present invention is 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-described embodiment, the friction transmission device 10 is applied to the motor device 1, but is not limited thereto, and the friction transmission device 10 may be operated alone.
In the above-described embodiment, the cross section of the leaf spring 140 cut in the axial direction is substantially 7-shaped on the side of the rotation center line of the rotation shaft 110, but the present invention is not limited thereto, and may be formed in other curved shapes such as a semicircular shape.
In the above embodiment, the sheet spring 140 has the inner peripheral portion 141 at least partially overlapping the outer peripheral portion 142 in the axial direction, but the present invention is not limited to this, and the inner peripheral portion 141 and the outer peripheral portion 142 may be provided so as to be shifted in the axial direction in some cases.
In the above embodiment, in the gear 120, the first flat surface portion 121, the first recessed portion 122, the second flat surface portion 125, and the second recessed portion 126 are each formed in a continuous ring shape centering on the rotation center line of the rotation shaft 110, but the present invention is not limited thereto, and the first flat surface portion 121, the first recessed portion 122, the second flat surface portion 125, and the second recessed portion 126 may be formed in a discontinuous ring shape, or may be formed in other shapes.
In the above embodiment, the gear 120 has the first recess 122 and the second recess 126, but the present invention is not limited to this, and the first recess 122 and the second recess 126 may be omitted in some cases.
In the above embodiment, the shaft 110 is made of metal, the gear 120 is made of resin, the washer 130 is made of metal, and the leaf spring 140 is made of metal, but the materials of the shaft 110, the gear 120, the washer 130, and the leaf spring 140 may be appropriately selected as necessary.
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: the rotating shaft is provided with a first pressing part and a second pressing part; the gear is sleeved on the rotating shaft in a rotatable mode; and a washer and a leaf spring, which are respectively fitted to the rotary shaft so as to be non-rotatable, the washer being pressed by the first pressing portion so as to abut against the gear from a first side in the axial direction, the leaf spring being pressed by the second pressing portion so as to abut against the gear from a second side in the axial direction,
the gear has a first flat surface portion against which the washer abuts in surface contact from the first side,
the leaf spring has an inner peripheral portion, an outer peripheral portion, and a connecting portion,
the inner peripheral portion is pressed from the second side by the second pressing portion,
the outer peripheral portion is located on an outer peripheral side of the inner peripheral portion and abuts against the gear from the second side,
the connecting portion extends from the inner peripheral portion to the outer peripheral portion in a bent manner.
2. The friction drive as recited in claim 1 wherein,
in a cross section of the leaf spring taken along the axial direction, a radial middle portion of a portion located on one side with respect to a rotation center line of the rotation shaft has a shape protruding toward the second side.
3. The friction drive as recited in claim 1 wherein,
the inner peripheral portion and the outer peripheral portion at least partially overlap in the axial direction.
4. The friction drive as recited in claim 1 wherein,
the first plane portion is formed in a ring shape around the rotation shaft.
5. The friction drive as recited in claim 1 wherein,
the surface of the first side of the gear has a first recess,
the first recessed portion extends from the first flat portion toward the inner peripheral side, and is separated from the gasket in the axial direction.
6. The friction drive as recited in claim 1 wherein,
the gear has a second flat surface portion against which the outer peripheral portion is brought into surface contact from the second side.
7. The friction drive as recited in claim 1 wherein,
the first pressing part is a first step part formed on the rotating shaft,
the second pressing portion is a riveting portion formed by punching the rotating shaft.
8. The friction drive as recited in claim 1 wherein,
a stopper portion is formed between the first pressing portion and the second pressing portion,
the limiting part is a second step part formed on the rotating shaft and used for limiting the range of the inner circumference part moving towards the first side.
9. The friction drive as recited in claim 8 wherein,
the rotating shaft is made of metal and is provided with a plurality of rotating shafts,
the gear is made of resin and is provided with a gear ring,
the said washer is made of metal and is made of metal,
the leaf spring is made of metal.
10. A motor device comprises a motor part and a gear set, which is characterized in that,
comprising a friction drive according to one of claims 1 to 9,
the driving force of the motor part is transmitted to the gear of the friction transmission device via the gear set to rotate the rotation shaft of the friction transmission device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121083239.1U CN215370680U (en) | 2021-05-20 | 2021-05-20 | Friction transmission device and motor device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121083239.1U CN215370680U (en) | 2021-05-20 | 2021-05-20 | Friction transmission device and motor device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215370680U true CN215370680U (en) | 2021-12-31 |
Family
ID=79630780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121083239.1U Expired - Fee Related CN215370680U (en) | 2021-05-20 | 2021-05-20 | Friction transmission device and motor device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215370680U (en) |
-
2021
- 2021-05-20 CN CN202121083239.1U patent/CN215370680U/en not_active Expired - Fee Related
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