US 11,560,934 B2Granted

Speed reducer and speed reducer-equipped motor

AssigneeDenso Corporation

InventorsKazuki Maruo, Masahito Sakai, Fumihiro Shimizu

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Abstract

A speed reducer includes a helical gear, an eccentric shaft and a slider plate. The speed reducer also includes a transmission gear and an output gear body. The transmission gear is supported at a first support part, transmission gear spinning is restricted by engagement with the slider plate, and the transmission gear revolves by the helical gear rotating with the eccentric shaft. The output gear body rotates by the transmission gear revolving. The transmission gear includes a pair of restricting protrusions protruding toward the slider plate side. The restricting protrusions have engaging surfaces that touch the slider plate wherein the engaging surfaces oppose the slider plate in a radial direction of the transmission gear. Surfaces at opposite sides of the restricting protrusions from the slider plate are formed, as seen in the axis direction of the transmission gear, to be convex to the opposite sides thereof from the slider plate.

Claims18

Dependent claims

A speed reducer, comprising:

a first gear that is configured to rotate upon transmission of rotary force thereto;
an eccentric shaft that is coupled to the first gear, the eccentric shaft including a support part that is offset, in a direction of a radius of rotation, from a rotation axis of the first gear;
a spinning restriction member that (i) is disposed at an outer side, in a radial direction, of the eccentric shaft and (ii) is configured to be supported at a sliding support member and to be capable of sliding with respect to the sliding support member;
a transmission gear that is supported at the support part, spinning of the transmission gear being restricted by engagement of the transmission gear with the spinning restriction member, and the transmission gear being configured to revolve around the rotation axis of the first gear as a result of rotation of the first gear together with the eccentric shaft;
and
an output part that is configured to rotate as a result of revolution of the transmission gear, wherein:
the transmission gear includes a pair of restricting protrusions that are disposed spaced apart in a radial direction of the transmission gear, an entirety of the spinning restriction member being disposed in a range between the pair of restricting protrusions, each of the restricting protrusions protruding (i) toward a side of the transmission gear at which the spinning restriction member is disposed (ii) from a portion of the transmission gear further toward a radial direction inner side of the transmission gear than outer teeth that are formed at an outer periphery portion of the transmission gear, and each of the restricting protrusions including an engaging face configured to contact the spinning restriction member in a state in which the engaging face is disposed so as to oppose the spinning restriction member;
a face of each restricting protrusion other than the engaging face, as seen from an axial direction of the transmission gear, is formed in a convex shape that is convex toward an opposite side of the restricting protrusion from a side thereof at which the spinning restriction member is disposed, and
a thickness of each restricting protrusion in a direction of sliding of the spinning restriction member with respect to the sliding support member progressively increases from each end side of the restricting protrusion toward a center of the restricting protrusion in a circumferential direction of the transmission gear.

6 more elements

A speed reducer, comprising:

a first gear that is configured to rotate upon transmission of rotary force thereto;
an eccentric shaft that is coupled to the first gear, the eccentric shaft including a support part that is offset, in a direction of a radius of rotation, from a rotation axis of the first gear;
a spinning restriction member that is disposed at an outer side, in a radial direction, of the eccentric shaft;
a transmission gear that is supported at the support part, spinning of the transmission gear being restricted by engagement of the transmission gear with the spinning restriction member, and the transmission gear being configured to revolve around the rotation axis of the first gear as a result of rotation of the first gear together with the eccentric shaft;
and
an output part that is configured to rotate as a result of revolution of the transmission gear, wherein:
the transmission gear includes a restricting protrusion that protrudes toward a side of the transmission gear at which the spinning restriction member is disposed and that includes an engaging face configured to contact the spinning restriction member in a state in which the engaging face is disposed so as to oppose the spinning restriction member in a radial direction of the transmission gear,
the spinning restriction member includes an engaged face that the engaging face is configured to contact, and
the engaging face is disposed closer to the engaged face at a protrusion direction base end side of the restricting protrusion than at a protrusion direction distal end side of the restricting protrusion.

6 more elements

A speed reducer, comprising:

a first gear that is configured to rotate upon transmission of rotary force thereto;
an eccentric shaft that is coupled to the first gear, the eccentric shaft including a support part that is offset, in a direction of a radius of rotation, from a rotation axis of the first gear;
a spinning restriction member that is disposed at an outer side, in a radial direction, of the eccentric shaft;
a transmission gear that is supported at the support part, spinning of the transmission gear being restricted by engagement of the transmission gear with the spinning restriction member, and the transmission gear being configured to revolve around the rotation axis of the first gear as a result of rotation of the first gear together with the eccentric shaft;
a sliding support member configured to support the spinning restriction member slidably in the direction of the radius of rotation of the first gear, the spinning restriction member being configured to slide at the sliding support member as a result of revolution of the transmission gear;
and
an output part that is configured to rotate as a result of revolution of the transmission gear, wherein:
the transmission gear includes a restricting protrusion that protrudes toward a side of the transmission gear at which the spinning restriction member is disposed and that includes an engaging face configured to contact the spinning restriction member in a state in which the engaging face is disposed so as to oppose the spinning restriction member in a radial direction of the transmission gear,
the spinning restriction member includes an engaged face and a first slider face, the engaging face being configured to contact the engaged face, and the first slider face being configured to slide against the sliding support member,
the sliding support member includes a second slider face configured to slide against the first slider face, and
as seen from an axial direction of the transmission gear, at least one of the engaging face or the engaged face is formed in a convex shape that is convex toward a side thereof at which the engaging face or the engaged face is disposed.

8 more elements

A speed reducer, comprising:

a first gear that is configured to rotate upon transmission of rotary force thereto;
an eccentric shaft that is coupled to the first gear, the eccentric shaft including a support part that is offset, in a direction of a radius of rotation, from a rotation axis of the first gear;
a spinning restriction member that is disposed at an outer side, in a radial direction, of the eccentric shaft;
a transmission gear that is supported at the support part, spinning of the transmission gear being restricted by engagement of the transmission gear with the spinning restriction member, and the transmission gear being configured to revolve around the rotation axis of the first gear as a result of rotation of the first gear together with the eccentric shaft;
a sliding support member configured to support the spinning restriction member slidably in the direction of the radius of rotation of the first gear, the spinning restriction member being configured to slide at the sliding support member as a result of revolution of the transmission gear;
and
an output part that is configured to rotate as a result of revolution of the transmission gear, wherein:
the transmission gear includes a restricting protrusion that protrudes toward a side of the transmission gear at which the spinning restriction member is disposed and that includes an engaging face configured to contact the spinning restriction member in a state in which the engaging face is disposed so as to oppose the spinning restriction member in a radial direction of the transmission gear,
the spinning restriction member includes an engaged face and a first slider face, the engaging face being configured to contact the engaged face, and the first slider face being configured to slide against the sliding support member,
the sliding support member includes a second slider face configured to slide against the first slider face, and
as seen from an axial direction of the transmission gear, the first slider face is formed in a convex shape that is convex toward a side thereof at which the second slider face is disposed.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/427,230Filed 1 Sep 2020
Priority: JP JP2019-17840230 Sep 2019
Published: US 2022/0099161 A131 Mar 2022
Granted: 24 Jan 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

F16H 1/32
With gears having orbital motion: in which the central axis of the gearing lies inside the periphery of an orbital gear
H02K 7/116
Structural association with clutches, brakes, gears, pulleys or mechanical starters: with gears
F16H 2001/323
In which the central axis of the gearing lies inside the periphery of an orbital gear: comprising eccentric crankshafts driving or driven by a gearing
F16H 2001/326
In which the central axis of the gearing lies inside the periphery of an orbital gear: comprising linear guiding means guiding at least one…