Resin gear device with resin lubricating grease composition
View Patent ↗An actuator includes a stepping motor; a multi-stage gear device including a first stage gear attached to a rotation shaft of the motor, wherein a gear of each stage engages with a gear of a next stage; and a base member on which the multi-stage gear device and the stepping motor are mounted, wherein in the multi-stage gear device, a grease composition for resin is applied to a bearing part of the gear, and to an engaging part between the gears, and the grease composition for resin includes: (a) a base oil including a poly-alpha-olefin oil with a kinematic viscosity at 100° C. of 4 to 6 mm 2 /s; (b) a thickening agent which is lithium soap; (c) a viscosity increasing agent; (d) a solid lubricant; and (e) an anti-wear agent, and wherein the NLGI consistency number of the composition is 00, 0, 1, or 2.
1. An actuator comprising:
a stepping motor;
a multi-stage gear device for decelerating a rotation of the stepping motor in order so as to increase rotational torque, including a first stage gear attached to a rotation shaft of the stepping motor, wherein a gear of each stage engages with a gear of a next stage; and
a base member on which the multi-stage gear device and the stepping motor are mounted,
wherein in the multi-stage gear device, a grease composition for resin is applied to a bearing part of the gear and to an engaging part between the gears, and the grease composition for resin includes:
(a) a base oil including a poly-alpha-olefin oil with a kinematic viscosity at 100° C. of 4 to 6 mm 2 /s;
(b) a thickening agent which is lithium soap;
(c) a viscosity increasing agent;
(d) a solid lubricant; and
(e) an anti-wear agent, and
wherein the NLGI (National Lubricating Grease Institute) consistency number of the composition is 00, 0, 1, or 2.
2. The actuator according to claim 1 , wherein the (c) viscosity increasing agent includes any one or both of a styrene-isoprene resin and a liquid isoprene rubber.
3. The actuator according to claim 2 , wherein the (c) viscosity increasing agent includes the styrene-isoprene resin at a proportion of 0.5% by mass to 6% by mass or includes the liquid isoprene rubber at a proportion of 5% by mass to 12% by mass based on the total mass of the grease composition for resin.
4. The actuator according to claim 2 , wherein the (c) viscosity increasing agent includes the styrene-isoprene resin and the liquid isoprene rubber at a proportion such that a mass ratio of the liquid isoprene rubber in relation to the styrene-isoprene resin is within a range of 2 to 5, and a mixed viscosity increasing component of the styrene-isoprene resin and the liquid isoprene rubber is included at a proportion of 0.9% by mass to 12% by mass based on the total mass of the grease composition for resin.
5. The actuator according to claim 1 , wherein the (d) solid lubricant includes melamine cyanurate and polytetrafluoroethylene such that a mass ratio of melamine cyanurate in relation to polytetrafluoroethylene is within a range of 0.6 to 9, and
a mixed lubricating component of the melamine cyanurate and the polytetrafluoroethylene is included at a proportion of 2% by mass to 10% by mass based on the total mass of the grease composition for resin.
6. The actuator according to claim 5 , wherein the (d) solid lubricant consists of melamine cyanurate and polytetrafluoroethylene.
7. The actuator according to claim 1 , wherein the (e) anti-wear agent includes any one or both of tricresyl phosphate and a polymeric ester, and
any one or both of the tricresyl phosphate and the polymeric ester are included at a proportion of 0.5% by mass to 3% by mass based on the total mass of the grease composition for resin.
8. An actuator comprising:
a motor;
a multi-stage gear device, including a first stage gear attached to a rotation shaft of the motor, wherein a gear of each stage engages with a gear of a next stage; and
a base member on which the multi-stage gear device and the motor are mounted,
wherein a grease composition for resin is applied to an engaging part between the gears, and the grease composition for resin includes:
(a) a base oil including a poly-alpha-olefin oil with a kinematic viscosity at 100° C. of 4 to 6 mm 2 /s;
(b) a thickening agent which is lithium soap;
(c) a viscosity increasing agent;
(d) a solid lubricant; and
(e) an anti-wear agent, and
wherein the NLGI (National Lubricating Grease institute) consistency number of the composition is 00, 0, 1, or 2.
9. The actuator according to claim 8 , wherein the (c) viscosity increasing agent includes any one or both of a styrene-isoprene resin and a liquid isoprene rubber.
10. The actuator according to claim 9 , wherein the (c) viscosity increasing agent includes the styrene-isoprene resin at a proportion of 0.5% by mass to 6% by mass or includes the liquid isoprene rubber at a proportion of 5% by mass to 12% by mass based on the total mass of the grease composition for resin.
11. The actuator according to claim 9 , wherein the (c) viscosity increasing agent includes the styrene-isoprene resin and the liquid isoprene rubber at a proportion such that a mass ratio of the liquid isoprene rubber in relation to the styrene-isoprene resin is within a range of 2 to 5, and a mixed viscosity increasing component of the styrene-isoprene resin and the liquid isoprene rubber is included at a proportion of 0.9% by mass to 12% by mass based on the total mass of the grease composition for resin.
12. The actuator according to claim 8 , wherein the (d) solid lubricant includes melamine cyanurate and polytetrafluoroethylene such that a mass ratio of melamine cyanurate in relation to polytetrafluoroethylene is within a range of 0.6 to 9, and
a mixed lubricating component of the melamine cyanurate and the polytetrafluoroethylene is included at a proportion of 2% by mass to 10% by mass based on the total mass of the grease composition for resin.
13. The actuator according to claim 8 , wherein the (e) anti-wear agent includes any one or both of tricresyl phosphate and a polymeric ester, and
any one or both of the tricresyl phosphate and the polymeric ester are included at a proportion of 0.5% by mass to 3% by mass based on the total mass of the grease composition for resin.
14. A gear device at least comprising:
a first stage gear attached to a rotation shaft of a motor; and
a second stage gear engaging with the first stage gear;
wherein at least one of the first stage gear and the second stage gear is resin-made, and a grease composition is applied to at least an engaging part between the first stage gear and the second stage gear, and
wherein the grease composition includes:
(a) a base oil including a poly-alpha-olefin oil with a kinematic viscosity at 100° C. of 4 to 6 mm 2 /s;
(b) a thickening agent which is lithium soap;
(c) a viscosity increasing agent;
(d) a solid lubricant; and
(e) an anti-wear agent, and
wherein the NLGI (National Lubricating Grease Institute) consistency number of the composition is 00, 0, 1, or 2.
15. The gear device according to claim 14 , wherein the (c) viscosity increasing agent includes any one or both of a styrene-isoprene resin and a liquid isoprene rubber.
16. The gear device according to claim 15 , wherein the (c) viscosity increasing agent includes the styrene-isoprene resin at a proportion of 0.5% by mass to 6% by mass or includes the liquid isoprene rubber at a proportion of 5% by mass to 12% by mass based on the total mass of the grease composition for resin.
17. The gear device according to claim 15 , wherein the (c) viscosity increasing agent includes the styrene-isoprene resin and the liquid isoprene rubber at a proportion such that a mass ratio of the liquid isoprene rubber in relation to the styrene-isoprene resin is within a range of 2 to 5, and a mixed viscosity increasing component of the styrene-isoprene resin and the liquid isoprene rubber is included at a proportion of 0.9% by mass to 12% by mass based on the total mass of the grease composition for resin.
18. The gear device according to claim 14 , wherein the (d) solid lubricant includes melamine cyanurate and polytetrafluoroethylene such that a mass ratio of melamine cyanurate in relation to polytetrafluoroethylene is within a range of 0.6 to 9, and
a mixed lubricating component of the melamine cyanurate and the polytetrafluoroethylene is included at a proportion of 2% by mass to 10% by mass based on the total mass of the grease composition for resin.
19. The gear device according to claim 18 , wherein the (d) solid lubricant consists of melamine cyanurate and polytetrafluoroethylene.
20. The gear device according to claim 14 , wherein the (e) anti-wear agent includes any one or both of tricresyl phosphate and a polymeric ester, and
any one or both of the tricresyl phosphate and the polymeric ester are included at a proportion of 0.5% by mass to 3% by mass based on the total mass of the grease composition for resin.